JP5068568B2 - Surface temperature measurement system, heating furnace, surface temperature measurement method, and computer program - Google Patents

Description

  The present invention relates to a surface temperature measurement system, a heating furnace, a surface temperature measurement method, and a computer program, and is particularly suitable for use in measuring the surface temperature of an object to be measured being heated.

  When manufacturing a thin steel plate by performing hot rolling, a steel material such as a slab is heated in a heating furnace before performing hot rolling. It is important to know the surface temperature of the steel material in the heating furnace in order to heat the steel material with an appropriate heat pattern. This is because by heating the steel material with an appropriate heat pattern, it is possible to improve processing accuracy in hot rolling, save energy in a heating furnace, improve production efficiency of thin steel plates, and the like.

  Therefore, in order to measure the surface temperature of the steel material in the heating furnace, it has been conventionally proposed to perform radiation temperature measurement using a radiation thermometer. The heating furnace has a high temperature of 1000 [° C.] to 1400 [° C.] due to a flame emitted from the burner (hereinafter referred to as a burner flame as necessary). For this reason, when measuring the temperature of a steel material by performing radiation temperature measurement, only the light emitted from the steel material is not detected by the radiation thermometer. That is, disturbance light emitted from the furnace wall and disturbance light emitted from the burner flame / combustion gas in the heating furnace are reflected on the surface of the steel plate and input to the radiation thermometer as stray light noise. Therefore, the luminance (radiant intensity) obtained by the radiation thermometer is a mixture of the luminance (radiant intensity) of the self-luminous light emitted from the steel material itself and the luminance (radiant intensity) of stray light noise.

Therefore, in order to accurately measure the temperature of the steel material by performing radiation temperature measurement, it is necessary to correctly estimate the stray light noise and correctly remove the influence of the stray light noise from the emission luminance obtained by the radiation thermometer. .
In Patent Document 1, in addition to the first radiation thermometer fixed at a position facing the steel surface with a predetermined interval, it is provided in the heating furnace and can scan the light receiving direction in all directions in the furnace. A technique using a second radiation thermometer is disclosed. In such a technique, the second radiation thermometer is scanned in the heating furnace to measure the luminance of the stray light noise existing in the heating furnace, and the second radiation temperature is calculated from the emission luminance measured by the first radiation thermometer. The brightness of the stray light noise measured with the meter is removed, and the temperature of the steel surface is measured.

  Moreover, in patent document 2, while measuring the light-emission brightness | luminance of the self-light-emission from steel materials with two mutually different wavelengths, the temperature of one point with the furnace wall of a heating furnace is measured with a thermocouple or a radiation thermometer. And the temperature of the steel material surface is measured using the luminous brightness from the steel material and the temperature (constant value) at a certain point on the furnace wall of the heating furnace.

JP 7-174634 A JP-A-6-258142

  As described above, there are two types of stray light noise: those caused by gas in the furnace and those caused by the furnace wall. The stray light noise caused by the gas in the furnace is limited to the wavelength of infrared light to be detected and the wavelength at which the gas does not emit light is used, or the gas that does not emit infrared light is interposed, or the gas itself is eliminated to create a vacuum inside the furnace. That's why you can avoid it. On the other hand, it is very difficult to accurately calculate the stray light noise caused by the furnace wall.

However, the techniques described in Patent Documents 1 and 2 cannot solve such problems.
That is, in the technique described in Patent Document 1, a measurement apparatus including a radiation thermometer and a drive mechanism for scanning the radiation thermometer in a high-temperature heating furnace of 1000 [° C.] to 1400 [° C.] is provided. Must be inserted. For this reason, a cooling mechanism for cooling the measuring apparatus must be provided in a limited space. Therefore, it is difficult to realize the technique described in Patent Document 1.

  In the technique described in Patent Document 2, only the furnace wall of the heating furnace is targeted for stray light noise. As described above, in the heating furnace, in addition to the furnace wall, burner flame, combustion gas, and the like cause stray light noise. Therefore, the technique described in Patent Document 2 has a problem that it is difficult to accurately measure the surface temperature of the steel material. Furthermore, in the technique described in Patent Document 2, only the temperature at a certain point on the furnace wall of the heating furnace is measured. Therefore, there is a problem that it is difficult to accurately measure the entire temperature of the furnace wall that causes stray light noise, and it is difficult to accurately measure the surface temperature of the steel material.

  The present invention has been made in view of such problems, so that stray light noise caused by the furnace wall can be calculated by the simplest possible method without reducing the accuracy as much as possible. The purpose is to do.

The surface temperature measurement system of the present invention includes a temperature measurement means using a plurality of thermocouples for measuring the temperature of a region in which disturbance light is incident on the surface of a measurement object heated in a heating furnace, and the measurement object Emission light measuring means for measuring the emission luminance of light of a specific wavelength in which the emission and absorption of gas is smaller than the other wavelength bands, and the emissivity of the surface of the object to be measured Emissivity storage means for storing in advance, and stray light noise for calculating the stray light noise brightness reflected to the light emission brightness measurement means on the surface of the object to be measured using the temperatures measured by the temperature measuring means using the plurality of thermocouples Of the emission luminance measured by the calculation means and the emission luminance measurement means, the self-luminance generated from the measured object itself, the stray light noise luminance calculated by the stray light noise calculation means, A light emitting luminance measured by the light intensity measuring means, said the self-emission luminance calculating means for calculating with the emissivity of the measured object surface, and self-emission luminance calculated by the self-emission luminance calculating means, the A surface temperature measuring system for measuring the surface temperature of the object to be measured, comprising surface temperature calculation means for calculating the surface temperature of the object to be measured using the emissivity of the surface of the object to be measured , the stray light The noise calculation means divides a region including a temperature measurement target region by the plurality of thermocouple temperature measurement means into a plurality of zones among the regions in which the disturbance light is generated , and the object to be measured is divided into a plurality of zones. the stray light noise intensity reflected by the surface to calculate the, by adding the stray noise intensity for each said zone, and zone stray noise calculating means asking you to stray noise intensity due to the zone, to generate the disturbance light Out-of-zone, non-zone stray light noise calculation means for calculating the stray light noise brightness reflected from the surface of the measured object due to the area outside the zone, and the bidirectionality of the measured object in the light of the specific wavelength Bi-directional reflectance deriving means for deriving reflectance, and solid angle storage means for preliminarily storing, for each zone, a solid angle for viewing the representative point of the zone from the measurement point of the emission luminance measuring means. The calculation of the stray light noise luminance for each zone in the zone stray light noise calculation means includes the disturbance light luminance for each zone calculated from the temperature of the representative point for each zone, the bidirectional reflectance, and the calculation target. The stray light noise luminance caused by the area outside the zone in the extra-zone stray light noise calculation means is calculated from the temperature of the representative point outside the zone. Performed by using the luminance of disturbance light in the area outside the zone, the emissivity of the surface of the object to be measured, the bidirectional reflectance, and the solid angle for each zone to be calculated, and due to the zone The stray light noise brightness reflected from the surface of the object to be measured is calculated by adding the stray light noise brightness to the outside and the stray light noise brightness caused outside the zone .
Moreover, the heating furnace of this invention has the said surface temperature measurement system, It is characterized by the above-mentioned.

The surface temperature measurement method of the present invention is a temperature measurement in which the temperature of a region that generates disturbance light incident on the surface of an object to be measured being heated in a heating furnace is measured using temperature measurement means using a plurality of thermocouples. And emission luminance measurement for measuring emission luminance of light having a specific wavelength, in which light emission and absorption is smaller than other wavelength bands, of light having a wavelength emitted from the object to be measured. An emissivity storage step for preliminarily storing the emissivity of the surface of the object to be measured, and a step of measuring the temperature of stray light noise reflected from the surface of the object to be measured to the light emission luminance measuring means using the plurality of thermocouples. A step of calculating a stray light noise using the temperature measured by the step of calculating a self-luminous brightness generated from the object to be measured among the light emission luminances measured by the light emission luminance measurement step. A self-luminous luminance calculation step for calculating the stray light noise luminance calculated by the stray light noise calculating step, the luminous luminance measured by the luminous luminance measuring step, and the emissivity of the surface of the object to be measured; A surface temperature calculation step of calculating a surface temperature of the object to be measured using the self light emission luminance calculated by the self light emission luminance calculation step and the emissivity of the surface of the object to be measured. A surface temperature measurement method for measuring a surface temperature of an object, wherein the stray light noise calculating step includes a region including a temperature measurement target region by a plurality of thermocouple temperature measuring means among the regions generating disturbance light. is divided into a plurality of zones, each divided zone, the calculated stray noise intensity reflected from the surface of the object to be measured, by adding the stray noise intensity for each said zone, those A zone stray light noise calculation step for obtaining a stray light noise brightness caused by the zone, and a stray light noise brightness reflected from the surface of the object to be measured, caused by the area outside the zone among the areas where the disturbance light is generated, is calculated. Step of calculating extraneous stray light noise, step of deriving bidirectional reflectance of the object to be measured in the light of the specific wavelength, and representative point of the zone from the measurement point of the emission luminance measuring means A solid angle storage step for preliminarily storing the solid angle for each zone, and the calculation of the stray light noise luminance for each zone in the zone stray light noise calculation step is calculated from the temperature of the representative point for each zone. Is performed using the luminance of disturbance light for each zone, the bidirectional reflectance, and the solid angle for each zone to be calculated. In the step, the stray light noise luminance due to the area outside the zone is calculated based on the disturbance light intensity outside the zone calculated from the temperature of the representative point outside the zone and the emissivity of the surface of the object to be measured. And the bi-directional reflectance and the solid angle for each zone to be calculated, and adding the stray light noise luminance due to the zone and the stray light noise luminance due to outside the zone The brightness of the stray light noise reflected from the surface of the object to be measured is calculated.

The computer program according to the present invention has a light emission luminance of light having a specific wavelength in which the emission and absorption of gas are smaller than those in other wavelength bands among the light having a wavelength emitted from an object to be measured being heated in a heating furnace. Using the measured values of the emission luminance measuring means for measuring and the temperature measuring means by a plurality of thermocouples for measuring the temperature of the region that generates disturbance light incident on the surface of the object to be measured, A computer program for causing a computer to measure a surface temperature, an emissivity storing step for preliminarily storing an emissivity of the surface of the object to be measured, and the light emission luminance measuring means on the surface of the object to be measured Stray light noise calculation step for calculating the stray light noise brightness reflected by the temperature measurement means by the plurality of thermocouples, and the emission brightness measurement means Among the light emission luminances measured, the self light emission luminance generated from the object to be measured itself is the stray light noise luminance calculated by the stray light noise calculation step, and the light emission luminance measured by the light emission luminance measurement means. Using the self-luminous luminance calculation step calculated using the emissivity of the surface of the object to be measured, the self-luminous luminance calculated by the self-luminous luminance calculation step, and the emissivity of the surface of the object to be measured A surface temperature calculation step for calculating a surface temperature of the object to be measured, and the stray light noise calculation step is performed by the temperature measurement means using the plurality of thermocouples in the region where the disturbance light is generated. a region including a temperature measurement target region is divided into a plurality of zones, each divided zone, to calculate the stray noise intensity reflected by the surface of the object to be measured, the zone A stray light noise calculation step for obtaining the stray light noise luminance due to the zone, and out of the area where the disturbance light is generated, A step of calculating the stray light noise brightness reflected from the surface, a step of calculating a stray light noise outside the zone, a step of deriving a bidirectional reflectance of the object to be measured in the light of the specific wavelength, and a step of calculating the light emission luminance A solid angle storage step for preliminarily storing, for each zone, a solid angle for viewing the representative point of the zone from the measurement point of the means, and the calculation of the stray light noise luminance for each zone in the zone stray light noise calculation step is as follows: Calculated using the disturbance light intensity for each zone calculated from the temperature of the representative point for each zone, the bidirectional reflectance, and the solid angle for each zone to be calculated. In the extra-zone stray light noise calculation step, the calculation of the stray light noise luminance due to the area outside the zone includes the disturbance light intensity outside the zone calculated from the temperature of the representative point outside the zone, This is performed using the emissivity of the surface of the object to be measured, the bidirectional reflectance, and the solid angle for each zone to be calculated, and is caused by stray light noise luminance caused by the zone and outside the zone. The stray light noise luminance is added to calculate the stray light noise luminance reflected from the surface of the measured object.

  Here, in the present invention, light generated from the object to be measured itself is referred to as self-emission, and the luminance is referred to as self-emission luminance. Light incident on the surface of the object to be measured from outside is referred to as disturbance light, and its luminance is referred to as disturbance light luminance. Of the light reflected from the surface of the object to be measured, the light that enters the light emission luminance measuring means is called stray light noise, and the luminance is called stray light noise luminance.

  According to the present invention, the stray light noise luminance reflected from the surface of the object to be measured is calculated for each zone obtained by dividing the temperature measurement target region of the plurality of temperature measuring means, so that the stray light noise luminance is as accurate as possible. Can be calculated by the simplest possible method without dropping the value.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating an example of a schematic configuration of a multiband walking beam type continuous heating furnace that is an example of an application target of the surface temperature measurement system of the present embodiment.
In FIG. 1, a multi-band walking beam type continuous heating furnace 10 includes a non-combustion zone 11, a pre-tropical zone 12, a heating zone 13, and a soaking zone 14, and a slab 21, which is an example of an object to be measured. The slab 21 is heated so as to pass through. In the following description, the multi-band walking beam continuous heating furnace 10 is abbreviated as the heating furnace 10. Moreover, in FIG. 1, the case where the 15 slabs 21 exist in the heating furnace 10 is mentioned as an example.

  In this embodiment, the length of the slab 21 charged in the heating furnace 10 is 6 [m] to 12 [m], the width is 0.6 [m] to 2.2 [m], and the thickness is 0.25. [M]. Further, the temperature of the slab 21 charged in the heating furnace 10 is set to about room temperature to 700 [° C.], and the temperature of the slab 21 extracted from the heating furnace 10 is set to a temperature of about 1100 [° C.] to 1250 [° C.]. It was. Furthermore, the in-furnace time of the slab 21 in the heating furnace 10 was set to 140 [minutes] to 220 [minutes]. According to the above operating conditions, the slab 21 is conveyed in the order of the non-combustion zone 11, the pre-tropical zone 12, the heating zone 13, and the soaking zone 14, and extracted from the heating furnace 10.

A plurality of (for example, eight) axial flow burners 15a and 15b are installed in the pre-tropical zone 12 and the heating zone 13, respectively. A plurality (for example, 20) of roof burners 16 are installed in the soaking zone 14. Further, a plurality of side burners 17 are installed in each of the pretropical zone 12, the heating zone 13, and the soaking zone 14 (for example, eight in the pretropical zone 12 and the heating zone 13 and 10 in the soaking zone 14). Yes. The side burners 17 are provided on both sides of the pre-tropical zone 12 and the heating zone 13, and emit a flame burner from both sides of the slab 21.
In the present embodiment, for example, LNG is used as a fuel for generating a burner flame from the axial flow burner 15, the roof burner 16, and the side burner 17, and air or oxygen-enriched air is used as a combustion support agent. In addition, the flame retardant sent to each burner 15-17 is preheated to about 400 [° C.] to 600 [° C.].

  In the non-combustion zone 11, the pre-tropical zone 12, the heating zone 13, and the soaking zone 14, a fixed skid beam that supports the slab 21 and a walking beam that carries the slab 21 in the carrying direction (the direction of the arrow in FIG. 1). Is provided. The slab 21 charged in the heating furnace 10 is intermittently conveyed in the conveying direction by the conveying device, and sequentially passes through the non-combustion zone 11, the pre-tropical zone 12, the heating zone 13, and the soaking zone 14, and the heating furnace 10. Extracted from The slab 21 extracted from the heating furnace 10 is conveyed to a hot rolling line.

  In the present embodiment, a surface temperature measurement system is provided in the heating zone 13 of the heating furnace 10 having such a configuration. The surface temperature measurement system of the present embodiment includes a radiation thermometer 100, a plurality of thermocouples 200 (see FIG. 2), an information processing device 500, and a display device 400.

  The radiation thermometer 100 is installed at a position where the surface of the slab 21 conveyed through the heating zone 13 is desired from above the heating zone 13 through a hole 13b formed in a part of the furnace wall surface of the heating zone 13. ing. In this way, the radiation thermometer 100 is installed at a position where the light incident surface (detection surface) faces the surface of the slab 21 conveyed in the heating zone 13 with a predetermined interval. Yes. In the following description, the furnace wall surface on the ceiling of the heating zone 13 will be referred to as the ceiling surface of the heating zone 13 or simply the ceiling surface as necessary.

The radiation thermometer 100 according to the present embodiment detects only light having a narrow-band wavelength centered at approximately 3.9 [μm] from the light incident on the light incident surface, and splits the light. Luminance (radiation intensity) I _b (T _m ) [W · m ⁻² · sr ⁻¹ · μm ⁻¹ ] is obtained. Here, the wavelength of the light detected by the radiation thermometer 100 is set to a wavelength of about 3.9 [μm] for the following reason. That is, the inventors of the present application have proposed that the specific wavelength at which the emission and absorption of the burner flame and combustion gas in the heating furnace 10 (heating zone 13) is lower than the others is 3.9 [μm]. This is because, based on the knowledge, the knowledge that this specific wavelength hardly causes the temperature measurement error was experimentally obtained.

Therefore, in the present embodiment, the specific wavelength with a remarkably small radiation and absorption with respect to a gas contributing to heating, such as a burner flame or combustion gas in the heating furnace 10 (heating zone 13), is approximately 3.9 [μm] ( For example, only a light having a center wavelength of 3.9 [μm] and a half width of 0.4 [μm] or less, preferably a center wavelength of 3.9 [μm] and a half width of 0.2 [μm] or less) is a radiation thermometer. 100 detects. Thereby, the “luminance (radiation intensity) of stray light noise based on burner flame or combustion gas” included in the emission luminance obtained by the radiation thermometer 100 can be reduced. In the following description, the luminance of stray light noise is referred to as stray light noise luminance as necessary.
As described above, in the present embodiment, for example, the emission thermometer 100 is realized using the radiation thermometer 100.

The thermocouple 200 is attached to the ceiling surface of the heating zone 13. FIG. 2 is a diagram showing an outline of the state of the thermocouples 200 a to 200 l attached to the heating zone 13. Specifically, FIG. 2A is a perspective view of a portion of the heating zone 13 to which the thermocouples 200a to 200l are attached as viewed obliquely from above, and FIG. 2B is a perspective view of FIG. It is sectional drawing seen from II 'direction. Since FIG. 1 is a cross-sectional view seen from the II-II ′ direction of FIG. 2A, the thermocouples 200a to 200l do not appear in FIG.
As shown in FIG. 2, in this embodiment, twelve thermocouples 200 a to 200 l are attached to the ceiling surface 13 a of the heating zone 13. Specifically, in the present embodiment, twelve thermocouples 200a to 200i are generally scattered at intervals of 1 [m].

FIG. 3 is a diagram illustrating an example of a range in which twelve thermocouples 200a to 200l are attached.
As shown in FIG. 3, in the present embodiment, the direction of the radiation thermometer 100 from the point 21 a that is a point on the surface of the slab 21 and is directly opposite the center 100 b of the light incident surface 100 a of the radiation thermometer 100. Twelve thermocouples so as to enter the inside of the virtual cone 41 when it is assumed that there is a virtual cone 41 having a zenith angle θ of 45 [°] (spreading angle is 90 [°]). 200 a to 200 l are attached to the ceiling surface 13 a of the heating zone 13.

  More specifically, the point 21a at the position facing the center 100b of the light incident surface 100a of the radiation thermometer 100 is the apex, and the zenith angle θ is 45 [°] (spreading angle is 90 [°]). When it is assumed that there is a virtual cone 41 having a bottom surface 41 a on the ceiling surface 13 a of the heating zone 13, twelve thermocouples 200 a to 200 j are placed inside the bottom surface 41 a of the virtual cone 41. Can be attached. In the following description, a point 21a that is a point on the surface of the slab 21 and that faces the center 100b of the light incident surface 100a of the radiation thermometer 100 is referred to as a temperature measurement center point 21a. Called.

In this way, the inventors of the present application obtained that the twelve thermocouples 200a to 200l are attached to the ceiling surface 13a of the heating zone 13 so as to enter the inside of the virtual cone 41. The reason is as follows.
The inventors of the present application have found that the emissivity ε _s of the slab 21 whose surface is oxidized by heating by the heating furnace 10 is approximately 0.85 regardless of the temperature. Therefore, the integral value of the entire ceiling surface 13a of the bidirectional reflectance ρ ″ (θ) of “light having a wavelength of 3.9 [μm]” emitted from the ceiling surface 13a of the heating zone 13 is independent of the temperature. It becomes approximately 0.15 (1-0.85). Here, the bidirectional reflectance ρ ″ (θ) is, for example, a measured region of the slab 21 from a point on the ceiling surface 13a of the heating zone 13 (for example, the point 13c that is the center position of the thermocouple 200h). It shows how much light is reflected in the direction (normal direction) of the light incident surface 100a of the radiation thermometer 100 among the light incident on the radiation thermometer 100. The measurement area of the slab 21 is an area centered on the temperature measurement center point 21 a and is a region facing the light incident surface 100 a of the radiation thermometer 100.

Then, the inventors of the present application describe the relationship between the incident angle (zenith angle) θ of light having a wavelength of 3.9 [μm] and the relative value of the bidirectional reflectance ρ ″ (θ) of the light, Experimentally examined. The result is shown in FIG.
Furthermore, the inventors of the present application set the relative value of the vertical axis of the graph 51 so that the result of integrating the function representing the graph 51 shown in FIG. 4 (area of the graph 51 shown in FIG. 4) is 0.15. The computer performed a calculation to change from the value to the actual value. As a result, the inventors of the present application have shown a relationship between the incident angle (zenith angle) θ of light having a wavelength of 3.9 [μm] and the actual value of the bidirectional reflectance ρ ″ (θ). A function of directional reflectance ρ ″ (θ) was obtained.
Then, the inventors of the present application performed the calculation of the following equation (1) using a computer.

  In the formula (1), φ represents an azimuth angle [°]. As apparent from the equation (1), of the light emitted from the ceiling surface 13 a of the heating furnace 10, about 70 [%] of the light reflected by the measurement area of the slab 21 and entering the radiation thermometer 100 is The light is emitted from the area inside the virtual cone 41 shown in FIG. In other words, of the light emitted from the ceiling surface 13a of the heating furnace 10, about 30 [%] of the light that is reflected by the measurement region of the slab 21 and enters the light incident surface 100a of the radiation thermometer 100 is shown in FIG. The light is emitted from outside the region inside the virtual cone 41 shown in FIG.

Furthermore, even if the temperature outside the region of the virtual cone 41 differs from the actual temperature by 100 [° C.], the inventors of the present invention have an error of light emission luminance required by the radiation thermometer 100 of about 20 [%]. I confirmed that there was.
From the above, the inventors of the present application are not based on all the light emitted from the entire ceiling surface 13a of the heating furnace 10, but based on the light emitted from the region inside the virtual cone 41. Even if the stray light noise luminance based on the disturbance light emitted from 13a was obtained, the knowledge that the error of the stray light noise luminance is less than 1% as shown in the following equation (2) was obtained.
0.3 × 0.15 × 0.2 × 100 = 0.9 [%] (2)

  When this 0.9 [%] error is converted into a temperature error, it is about 5 [° C.]. Therefore, even if the stray light noise luminance based on the disturbance light emitted from the ceiling surface 13a of the heating furnace 10 is obtained based on the light emitted from the area inside the virtual cone 41, the surface temperature of the slab 21 due to this is obtained. The error is about 5 [° C.], and a practically sufficient accuracy can be secured.

  From the above, in the present embodiment, twelve thermocouples 200a to 200l are interspersed with the shape of the bottom surface of the virtual cone 41 in the region inside the virtual cone 41 shown in FIG. The temperature in the region is measured as accurately as possible, and the temperature outside the region is roughly estimated from the measurement results of the twelve thermocouples 200a to 200l, for example. By doing in this way, even if it does not arrange | position the thermocouple 200 to the whole ceiling surface 13a of the heating furnace 10, the surface temperature of the slab 21 can be calculated | required with sufficient practical accuracy.

  Furthermore, in this embodiment, the “temperature measurement target area 210 of the thermocouple 200” determined based on the installation position of the thermocouple 200 is divided to define the same number of zones as the number of thermocouples 200 installed. In the example shown in FIG. 2, a cross-shaped region determined based on the installation positions of the twelve thermocouples 200a to 200l is defined as a “temperature measurement target region 210 of the thermocouple 200”, and the temperature measurement target of the thermocouple 200 is defined. The area 210 is divided into 12 to define 12 zones A to L.

  More specifically, in the present embodiment, twelve rectangular zones A to L are defined with the installation position of each of the thermocouples 200a to 200l as the center position. And the size of each zone A-L is made into the magnitude | size which can consider that temperature is uniform. That is, in the present embodiment, zones A to L having a size at which the temperature can be regarded as uniform are defined.

  Here, whether or not the temperature can be regarded as uniform is determined depending on whether or not the measurement error of the surface temperature of the slab 21 performed as described later is within the accuracy range required in practice. As will be described later, in this embodiment, the stray light noise luminance based on the disturbance light emitted from the ceiling surface 13a of the heating furnace 10 is calculated for each of the zones A to L. As the size of the zones A to L increases, the difference between the maximum value and the minimum value of the temperatures in the zones A to L increases. Therefore, when the stray light noise luminance is calculated for each of the zones A to L as described above, the stray light noise luminance based on the disturbance light emitted from the zones A to L becomes larger as the size of the zones A to L becomes larger. , And the measurement error of the surface temperature of the slab 21 increases.

  Therefore, in the present embodiment, the sizes of the zones A to L are within a range where the temperature can be regarded as uniform so that the measurement error of the surface temperature of the slab 21 falls within the range of accuracy required for practical use. Is defined. As described above, in the present embodiment, the sizes of the zones A to L may be defined so that the measurement error of the surface temperature of the slab 21 is within the accuracy range required in practice. Therefore, in the present embodiment, if the measurement error of the surface temperature of the slab 21 is within a practically required accuracy range, the temperatures of the zones A to L are uniform even if they have a certain temperature range. It can be considered.

In the present embodiment, the twelve zones A to L defined as described above have the same size. Further, the boundaries of zones A to L are set as intermediate positions of the thermocouples 200a to 200l.
As described above, in the present embodiment, for example, a plurality of temperature measuring means is realized using twelve thermocouples 200a to 200l.

  Returning to FIG. 1, the information processing apparatus 500 includes a signal of “light emission luminance” obtained by the radiation thermometer 100 and a signal of “temperature of the ceiling surface 13 a of the heating zone 13” measured by the thermocouple 200. Is input, the surface temperature of the slab 21 is calculated using the input signal, and the calculated surface temperature is displayed on the display device 400. The hardware of the information processing apparatus 500 can be realized using a personal computer or the like, an information processing apparatus including a CPU, ROM, RAM, hard disk, image input / output board, various interfaces, an interface controller, and the like. The display device 400 includes a computer display such as an LCD (Liquid Crystal Display). A user interface such as a keyboard and a mouse is also connected to the information processing apparatus 500.

  FIG. 5 is a block diagram illustrating an example of a functional configuration of the information processing apparatus 500. Unless otherwise specified, each block shown in FIG. 5 is realized by the CPU executing a control program stored in the ROM or hard disk using the RAM. For example, the following processing is realized by exchanging signals between the blocks shown in FIG.

The emission luminance acquisition unit 301 is for inputting a signal of the emission luminance I _b (T _m ) obtained by the radiation thermometer 100 and storing it in the RAM.
The zone stray light noise luminance calculation unit 317 is for calculating the stray light noise luminance in each of the zones A to L. The disturbance light luminance calculation unit 315, the stray light noise parameter calculation unit 316, and the zone unit stray light noise luminance calculation unit 313.
The disturbance light luminance calculation unit 315 is for calculating the disturbance light luminance, and includes a thermocouple temperature acquisition unit 302, a thermocouple position storage unit 303, and a first emission luminance calculation unit 308.
The thermocouple temperature acquisition unit 302 is for inputting signals of the temperatures measured by the twelve thermocouples 200a to 200l and storing them in the RAM. At this time, the thermocouple temperature acquisition unit 302 can identify which thermocouple 200a to 200l is the measured temperature, and stores the temperature in the RAM.

  The thermocouple position storage unit 303 is for storing the installation positions of the twelve thermocouples 200 a to 200 l attached to the ceiling surface 13 a of the heating zone 13. In the present embodiment, the thermocouple position storage unit 303 is a table in which twelve thermocouples 200a to 200l, zones A to L to which the thermocouples 200a to 200l belong, and positions of the zones A to L are associated with each other. have. The thermocouple position storage unit 303 can be configured using, for example, a hard disk or ROM.

Based on the temperature T _ij acquired by the thermocouple temperature acquisition unit 302, the first emission luminance calculation unit 308 calculates the luminance I _b (T _ij ) of disturbance light emitted from each zone A to L as follows: (3) Calculate using the equation. In the following description, the luminance of disturbance light is referred to as disturbance light luminance as necessary.

λ: wavelength of light detected by the radiation thermometer 100 (3.9 [μm] in this embodiment)
C ₁ and C ₂ : Physical constants (C ₁ = 3.7419 × 10 ⁻¹⁶ [wm ² ], C ₂ = 1.4388 × 10 ⁻² [mK])
T _ij : temperature of representative point of each zone A to L [K]

The stray light noise parameter calculation unit 316 is for calculating and storing parameters for obtaining the stray light noise luminance and the like. The emissivity storage unit 304, the bidirectional reflectance calculation unit 305, the parameter calculation unit 306, and A parameter storage unit 307 is provided.
The emissivity storage unit 304 acquires and stores data on the emissivity ε _s of the slab 21 whose surface is oxidized by heating by the heating furnace 10 from the outside, based on the operation of the user interface (keyboard or mouse) by the user. Is to do. In the following description, if necessary, the emissivity epsilon _s of the slab 21 the surface of which is oxidized by the heating by the heating furnace 10, if necessary, the emissivity of the slab 21 epsilon _s or simply emissivity epsilon _s Abbreviated.

As described above, the present inventors have found that the emissivity ε _s of the slab 21 is approximately 0.85 and constant. Therefore, in this embodiment, the emissivity storage unit 304 acquires 0.85 from the outside as the emissivity ε _s of the slab 21 and stores it. As described above, in the present embodiment, the emissivity ε _s of the slab 21 is obtained by a computer offline and stored in the emissivity storage unit 304 before the surface temperature of the slab 21 is measured. The emissivity storage unit 304 can be realized, for example, when the CPU executes a control program stored in the ROM or hard disk using the RAM and stores the emissivity ε _s in the hard disk or ROM.

The bi-directional reflectance deriving unit 305 measures the bi-directional reflectance ρ ″ (θ) of light having a wavelength of 3.9 [μm] based on the operation of the user interface (keyboard or mouse) by the user. Get data from outside. Then, the bidirectional reflectance deriving unit 305 is a light having a wavelength of 3.9 [μm] based on the measurement data of the bidirectional reflectance ρ ″ (θ) having a wavelength of 3.9 [μm]. A function representing the relationship between the incident angle (zenith angle) θ and the relative value of the bidirectional reflectance ρ ″ (θ) of the light is obtained. That is, the bidirectional reflectance deriving unit 305 obtains a function representing the graph 51 as shown in FIG. 4, for example. Then, the bidirectional reflectance derivation unit 305 integrates the obtained function (area of the graph 51 shown in FIG. 4) from “1” to “emissivity ε _s stored by the emissivity storage unit 304. The value of the vertical axis of the graph 51 is changed from the relative value to the actual value so that the value of the vertical axis of the graph 51 is changed, and the bidirectional reflectance ρ ″ (θ) based on the graph 51 of which the value of the vertical axis is changed. Find the function of. In the present embodiment, 0.85 is stored as the emissivity ε _s of the slab 21 by the emissivity storage unit 304. Therefore, the result of integrating the obtained function (area of the graph 51 shown in FIG. 4) is The value on the vertical axis of the graph 51 is changed from the relative value to the actual value so as to be 0.15 (= 1-0.85).

The parameter calculation unit 306 is determined from the geometric relationship between the representative points of the zones A to L and the temperature measurement center point 21a in the slab 21. The “three-dimensional view of the representative points of the zones A to L from the temperature measurement center point 21a. The in-zone stray light noise parameter is calculated based on the “angle” and the bidirectional reflectance ρ ″ (θ) obtained by the bidirectional reflectance derivation unit 305.
Specifically, the parameter calculation unit 306 uses the position of the representative point of each zone A to L, the position of the temperature measurement center point 21a, and the area A _ij of each zone A to L as solid angle data from the user interface. input. Then, the parameter calculation unit 306 calculates, for each of the zones A to L, the length l _ij of a straight line connecting the representative points (for example, the point 13c in FIG. 2) of the zones A to L and the temperature measurement center point 21a. The parameter calculation unit 306 includes a straight line connecting the representative points of the zones A to L and the temperature measurement center point 21a, and a straight line connecting the temperature measurement center point 21a and the center 100b of the light incident surface 100a of the radiation thermometer 100. There the angle theta _ij, is calculated for each zone a to L (see Figure 2). Then, for each of the zones A to L, the in-zone stray light noise parameter is calculated for each of the zones A to L using the following equation (4). In the above description, the subscript ij is a variable for identifying the zones A to L.

θ _ij : An angle [° formed by a straight line connecting the representative points of the zones A to L and the temperature measurement center point 21a and a straight line connecting the temperature measurement center point 21a and the center 100b of the light incident surface 100a of the radiation thermometer 100 [°. ]
A _ij : Area [m ² ] of each zone A to L
ρ ″ (θ _ij ): Bidirectional reflectance In the present embodiment, in the equation (4), (cos θ _ij · A _ij / l _ij ² ) is represented by the zones A to L from the temperature measurement center point 21a. This is a solid angle for viewing the representative point.

Further, the parameter calculation unit 306 calculates the stray light noise parameter (outside zone stray light noise parameter) of the “region of the ceiling surface 13a” other than the zones A to L using the in-zone stray light noise parameter calculated as described above. To do. Here, if a zone is defined over the entire ceiling surface 13a, the value obtained by adding the intra-zone stray light noise parameter (the right side of the equation (4)) in each zone is “1-ε _s ”. Therefore, the extra-zone stray light noise parameter is obtained by subtracting the added value of the intra-zone stray light noise parameter in each of the zones A to L from “1-ε _s ”. That is, the parameter calculation unit 306 calculates the extra-zone stray light noise parameter using the following equation (5).

θ _ij : An angle [° formed by a straight line connecting the representative points of the zones A to L and the temperature measurement center point 21a and a straight line connecting the temperature measurement center point 21a and the center 100b of the light incident surface 100a of the radiation thermometer 100 [°. ]
A _ij : Area [m ² ] of each zone A to L
ρ ″ (θ _ij ): Bidirectional reflectance

The parameter storage unit 307 includes a table that stores the stray light noise parameters (intra-zone stray light noise parameters and out-zone stray light noise parameters) calculated by the parameter calculation unit 306. FIG. 6 is a diagram illustrating an example of the contents stored in the parameter storage unit 307.
The parameter storage unit 307 can be configured using, for example, a hard disk or a ROM.

The zone unit stray light noise luminance calculation unit 313 multiplies the disturbance light luminance I _b (T _ij ) obtained by the disturbance light luminance calculation unit 315 and the intra-zone stray light noise parameter obtained by the stray light noise parameter calculation unit 316. Then, the stray light noise brightness for each zone is calculated. Specifically, the zone unit stray light noise luminance calculation unit 313 calculates the stray light noise luminance for each zone using the following equation (6).

  When the zone unit stray light noise luminance calculation unit 313 calculates the stray light noise luminance for each zone for all the zones A to L, the adding unit 314 calculates “stray light noise luminance for each zone” in all the zones A to L. The stray light noise brightness in all zones A to L (all zone stray light noise brightness) is calculated by addition. Specifically, the adding unit 314 calculates the all-zone stray light noise luminance using the following equation (7).

In the equation (7), the subscript ij is a variable for identifying the zones A to L.
The second emission luminance calculation unit 309 inputs the temperatures of the thermocouples 200 a, 200 d, 200 e, and 200 h to 200 l outside the twelve thermocouples 200 a to 200 l from the thermocouple temperature acquisition unit 302. Then, the second light emission luminance calculator 309, the average value of the input temperature is calculated as the temperature T _o of the "region of the ceiling surface 13a 'of the non-zone A to L. Then, the second light emission luminance calculation unit 309 calculates the disturbance light luminance I _o (T _o ) based on the light emitted from the “region of the ceiling surface 13a” other than the zones A to L by the following equation (8). Use to calculate.

λ: wavelength of light detected by the radiation thermometer 100 (3.9 [μm] in this embodiment)
C ₁ and C ₂ : Physical constants (C ₁ = 3.7419 × 10 ⁻¹⁶ [wm ² ], C ₂ = 1.4388 × 10 ⁻² [mK])
T _o: other than the zone A~L of the "area of the ceiling surface 13a" temperature [K]

The temperature T _o of the "region of the ceiling surface 13a 'of the non-zone A~L can be determined by various methods other than the method described above. For example, in addition to the thermocouple 200, the heating furnace 10 is provided with an existing thermocouple necessary for operation. Therefore, using the value of the existing thermocouple, the “ceiling surface” other than the zones A to L is used. it may be obtained the temperature T _o of the region "13a.

The third emission luminance calculation unit 310 uses the extra-zone stray light noise parameter (see equation (5)) stored in the parameter storage unit 307 and “zones A to L calculated by the second emission luminance calculation unit 309. Light emission from “region of ceiling surface 13a” other than “zones A to L” is read out and multiplied by disturbance light intensity I _o (T _o ) based on light emitted from “region of ceiling surface 13a” other than The stray light noise luminance based on the emitted light ”(outside zone stray light noise luminance) is calculated. Specifically, the third light emission luminance calculation unit 310 calculates the following equation (9).

The third emission luminance calculation unit 310 stores the “measurement value of the radiation thermometer 100 (emission luminance I _b (T _m ))” acquired by the emission luminance acquisition unit 301 and the emissivity storage unit 304. The “emissivity ε _{s of the} slab 21”, the “all-zone stray light noise luminance” calculated by the adder 314, and the “out-zone stray light noise luminance” calculated as described above are as follows: Assign to an expression. Equation (10) can be transformed into the following equation (11). Therefore, the third light emission luminance calculation unit 310 calculates the self-light emission luminance I _b (T _s ) emitted from the slab 21 itself using the equation (11). In the following description, the self-luminous luminance emitted from the slab 21 itself is referred to as self-luminous luminance emitted from the slab 21 itself, or simply self-luminous luminance, as necessary.

ε _s : Emissivity of the slab 21 I _b (T _m ): Luminance brightness [W · m ⁻² · sr ⁻¹ · μm ⁻¹ ] obtained by the radiation thermometer 100
I _b (T _ij ): Intensity of disturbance light emitted from each of the zones A to L [W · m ⁻² · sr ⁻¹ · μm ⁻¹ ]
I _o (T _o ): disturbance light intensity I _o (T _o ) [W · m ⁻² · sr ⁻¹ · μm ⁻¹ based on light emitted from “region of the ceiling surface 13a” other than zones A to L ]
θ _ij : An angle [° formed by a straight line connecting the representative points of the zones A to L and the temperature measurement center point 21a and a straight line connecting the temperature measurement center point 21a and the center 100b of the light incident surface 100a of the radiation thermometer 100 [°. ]
A _ij : Area [m ² ] of each zone A to L
ρ ″ (θ _ij ): Bidirectional reflectance T _ij : Temperature of representative point of each zone A to L [K]
T _o: other than the zone A~L of the "area of the ceiling surface 13a" temperature [K]

  In equation (10), the first term on the right side is the self-luminous luminance, the second term on the right side is the contribution due to the stray light noise from within zones A to L (all zone stray light noise luminance), and the third term on the right side. Is a contribution due to stray light noise from outside the zones A to L (outside zone stray light noise luminance), and the sum of these contributes to the left side (light emission luminance obtained by the radiation thermometer 100).

The surface temperature calculation unit 311 calculates the “self-luminance luminance I _b (T _s ) emitted from the slab 21 itself” calculated by the third emission luminance calculation unit 310 and the “slab 21” stored in the emissivity storage unit 304. The surface temperature T _s [K] of the measurement area of the slab 21 is calculated as an absolute temperature by substituting the emissivity ε _{s of} the slab 21 into the following equation (12).

λ: wavelength of light detected by the radiation thermometer 100 (3.9 [μm] in this embodiment)
C ₁ , C ₂ : physical constant ε _s I _b (T _s ): self-luminous luminance [W · m ⁻² · sr ⁻¹ · μm ⁻¹ ] emitted from the slab 21 itself

The surface temperature display unit 312 displays the “surface temperature T _{s of the} measurement area of the slab 21” obtained by the surface temperature calculation unit 311 on the display device 400 to notify the user.

Next, an example of processing operation in the information processing apparatus 500 will be described with reference to the flowchart of FIG.
First, in step S < _b > 1, the emission luminance acquisition unit 301 waits until acquiring a signal of the emission luminance I _b (T _m ) obtained by the radiation thermometer 100. And if the signal of the light emission brightness | luminance _Ib ( _Tm ) calculated | required with the radiation thermometer 100 is acquired, it will progress to step S2. In step S2, the emission luminance acquisition unit 301 stores the emission luminance I _b (T _m ) obtained by the radiation thermometer 100 in the RAM.

Next, in step S <b> 3, the thermocouple temperature acquisition unit 302 waits until acquiring signals of the temperature T _ij measured by the twelve thermocouples 200 a to 200 l. When acquiring the twelve thermocouples signals measured temperature T _ij at 200A～200l, the process proceeds to step S4. In step S4, the thermocouple temperature acquisition unit 302 stores the temperature T _ij measured by the twelve thermocouples 200a to 200l in the RAM. At this time, the thermocouple temperature acquisition unit 302 can identify which thermocouple 200a to 200l is the measured temperature, and stores the temperature in the RAM.

Next, in step S < _b > 5, the first emission luminance calculation unit 308 is based on the temperature T _ij acquired by the thermocouple temperature acquisition unit 302, and the disturbance light luminance I _b (T _ij ) is calculated using equation (3).

Next, in step S6, the zone unit stray light noise luminance calculation unit 313 sets a variable ij for identifying the zones A to L to “1”. Here, when “1” to “12” are set as the variable ij, zones A to L are designated, respectively.
Next, in step S <b> 7, the zone unit stray light noise luminance calculation unit 313 reads the in-zone stray light noise parameter of the zone specified by the variable ij from the parameter storage unit 307.
Next, in step S8, the zone-unit stray light noise luminance calculation unit 313 calculates the disturbance light luminance I _b (T _ij ) emitted from the zone specified by the variable ij, and the first emission luminance calculation unit 308 in step S5. _Is obtained from the disturbance light luminance I _b (T _ij ) calculated by the above. Then, the zone unit stray light noise luminance calculation unit 313 multiplies the intra-zone stray light noise parameter read in step S7 by the disturbance light luminance I _b (T _ij ) acquired from the first light emission luminance calculation unit 308 ( (See equation (6)), and calculates stray light noise luminance (stray light noise luminance for each zone) based on light emitted from the calculation target zone.

  Next, in step S9, the zone unit stray light noise luminance calculation unit 313 determines whether or not the variable ij is “12”. As a result of this determination, if the variable ij is not “12”, the stray light noise luminance is not calculated for all the zones A to L, so the process proceeds to step S10, and “1” is added to the variable ij. And the process of step S7-S9 is performed with respect to the following zone.

  On the other hand, when the variable ij is “12”, it is determined that the stray light noise luminance is calculated for all the zones A to L, and the process proceeds to step S11. In step S11, the adding unit 314 adds the “stray light noise luminance of each zone A to L” (stray light noise luminance for each zone) calculated in step S8, and stray light noise in all the zones A to L. Brightness (all zone stray light noise brightness) is calculated (see equation (7)).

Next, in step S12, the second emission luminance calculation unit 309 calculates the average value of the temperatures of the thermocouples 200a, 200d, 200e, and 200h to 200l as the temperature of the “region of the ceiling surface 13a” other than the zones A to L. It is calculated as T _o. Then, the second light emission luminance calculation unit 309 calculates the disturbance light luminance I _o (T _o ) based on the light emitted from the “region of the ceiling surface 13a” other than the zones A to L using the equation (8). calculate.

Next, in step S <b> 13, the third light emission luminance calculation unit 310 reads out-zone stray light noise parameters stored in the parameter storage unit 307 (see equation (5)). Then, the third emission luminance calculation unit 310 performs disturbance light based on the read out-of-zone stray light noise parameter and the light emitted from the “region of the ceiling surface 13a other than the zones A to L” calculated in step S12. The luminance I _o (T _o ) is multiplied to calculate “stray light noise luminance based on light emitted from the“ region of the ceiling surface 13a ”other than zones A to L” (outside zone stray light noise luminance). Thereby, the equation (9) is calculated.

Next, in step S <b> 14, the third emission luminance calculation unit 310 reads “emissivity ε _{s of the} slab 21” stored in the emissivity storage unit 304.
Next, in step S15, the third light emission luminance calculation unit 310 calculates the all-zone stray light noise luminance calculated in step S11 (the second term on the right side of equation (10)) and the extra-zone stray light calculated in step S13. Noise luminance (third term on the right side of equation (10)), “emissivity ε _{s of} slab 21” read out in step S14, and “emission determined by radiation thermometer 100” stored in step S2. Substituting “brightness I _b (T _m )” into equation (10) (or equation (11)), self-luminous luminance ε _s I _b (T _s ) emitted from slab 21 itself is calculated.

Next, in step S16, the surface temperature calculation unit 311 calculates the “self-luminous luminance ε _s I _b (T _s ) emitted from the slab 21 itself” calculated in step S15 and the “slab slab” read in step S14. 21 emissivity epsilon _s "and, (12) are substituted into equation to calculate the surface temperature T _s [K] of the measurement region of the slab 21 with the absolute temperature.
Next, in step S17, the surface temperature display unit 312 displays the “surface temperature T _{s of the} measurement area of the slab 21” calculated in step S16 on the display device 400 to notify the user.

  Here, in this embodiment, the radiation thermometer 100 detects light from the slab 21 whose surface temperature is 700 [° C.] or higher, preferably 900 [° C.] or higher. This is based on the following knowledge obtained by the inventors of the present application.

As described above, it has been found that the emissivity ε _s of the slab 21 whose surface is oxidized by heating by the heating furnace 10 is approximately constant at 0.85. However, the emissivity ε _s does not have a completely constant value, but varies to some extent, and the true value of the emissivity ε _s cannot be known. The inventors of the present application have found that the emissivity ε _s varies by about 0.85 ± 0.02.

  Therefore, the inventors of the present application investigated a temperature measurement error due to a change in emissivity by calculation. First, the emissivity was assumed to be 0.85, and then the temperature measurement error that occurred when the actual emissivity was 0.83 or 0.87 was calculated based on Planck's blackbody radiation theory. In this calculation, the temperature distribution on the ceiling surface 13a is assumed to be uniform at 1200 [° C.]. FIG. 8 is a diagram illustrating an example of a relationship between the absolute value of the difference between the calculated value of the surface temperature of the slab 21 and the true value (that is, a temperature measurement error) and the true value of the surface temperature of the slab 21. It is.

In FIG. 8, a graph 91 is a graph showing an error between a calculated value and a true value of the surface temperature T _s of the slab 21 when the actual emissivity ε _s is 0.87, and a graph 92 is when the actual emissivity epsilon _s is 0.83, which is a graph showing the error between the calculated value and the true value of the surface temperature T _s. As is apparent from these graphs 91 and 92, if the surface temperature of the slab is 700 [° C.] or higher, the “evaluation value of the surface temperature of the slab 21 and the true value are generated due to variations in the emissivity ε _s . The “error” can be set to 20 ° C. or less, and the surface temperature T _s of the slab 21 can be calculated with sufficient practical accuracy. Furthermore, if the surface temperature of the slab is 900 [° C.] or higher, the “error between the calculated value of the surface temperature of the slab 21 and the true value” caused by variation in the emissivity ε _s is set to 10 [° C.] or lower. The surface temperature T _s of the slab 21 can be calculated with higher accuracy.

  For the reasons as described above, in this embodiment, the radiation thermometer 100 detects light from the slab 21 whose surface temperature is 700 [° C.] or higher, preferably 900 [° C.] or higher. Yes. The surface temperature of the slab 21 passing through the heating zone 13 of the present embodiment is 700 [° C.] or higher. Therefore, if the radiation thermometer 100 is provided as shown in FIG. 1, the radiation thermometer emits light from the slab 21 whose surface temperature is 700 [° C.] or higher (preferably 900 [° C.] or higher). 100 can be detected. In the present embodiment, the range of the surface temperature detected by the radiation thermometer 100 is set to 700 [° C.] or more (preferably 900 [° C.] or more) and 1100 [° C.] or less.

As described above, in the present embodiment, the cross-shaped region determined based on the installation positions of the twelve thermocouples 200a to 200l is defined as the “temperature measurement target region 210 of the thermocouple 200”, and the thermocouple 200 The temperature measurement target area 210 was divided into 12 and 12 zones A to L were defined. At this time, the zones A to L can be regarded as being uniform (so that the temperatures of the zones A to L can be regarded as substantially the same as the temperatures of the thermocouples 200a to 200l). The size of L was defined. And in the zones A to L, the stray light noise luminance is obtained for each zone using the temperatures of the thermocouples 200a to 200l, and the stray light noise luminance obtained for each zone is added to the stray light of the entire zone. Calculated as noise luminance. On the other hand, for the region of the ceiling surface 13a other than the zones A to L, the average value of the temperatures of the thermocouples 200a, 200d, 200e, and 200h to 200l is set to the temperature T of the “region of the ceiling surface 13a” other than the zones A to L. Using as _o , stray light noise brightness was calculated at once.

  As described above, in the region contributing to about 70 [%] of the stray light noise incident on the radiation thermometer 100 (the temperature measurement target region 210 of the thermocouple 200), the zone can be regarded as having a uniform temperature. The stray light noise brightness is obtained every time, and the stray light noise brightness is obtained as accurately as possible. On the other hand, for other regions, stray light noise is obtained by setting an appropriate (roughly) temperature within a reasonable range from experience. By doing in this way, even if it does not arrange | position the thermocouple 200 to the whole ceiling surface 13a of the heating furnace 10, the surface temperature of the slab 21 can be calculated | required with sufficient practical accuracy. Further, since the stray light noise luminance is obtained for each zone, the calculation load on the information processing apparatus 500 can be further reduced.

  Further, in the present embodiment, from the upper side of the heating zone 13 through the hole 13b formed in a part of the ceiling surface of the heating zone 13, the position of the surface of the slab 21 conveyed in the heating zone 13 is approximately 3 at a desired position. A radiation thermometer 100 that detects only light having a wavelength of .9 [μm] is installed. As a result, the “stray light noise luminance based on the burner flame or combustion gas” included in the emission luminance required by the radiation thermometer 100 can be reduced to a level that can be ignored in practice.

Further, in the present embodiment, when it is assumed that there is a virtual cone 41 having a zenith angle θ of 45 [°] extending from the temperature measurement center point 21 a in the direction of the radiation thermometer 100, Twelve thermocouples 200a to 200l are scattered on the ceiling surface 13a of the heating zone 13 in a substantially lattice manner so that the “temperature measurement target region 210 of the thermocouple 200” exists in the inner region. did. Therefore, the temperature distribution in the region contributing to about 70% of the stray light noise incident on the radiation thermometer 100 can be obtained accurately. Therefore, the surface temperature T _s of the measurement area of the slab 21 can be easily obtained with higher accuracy than before and without applying a large calculation load.

In the present embodiment, before measuring the surface temperature of the slab 21 (offline), the emissivity ε _s of the slab 21 and the bidirectional reflectance ρ ″ of light having a wavelength of 3.9 [μm]. (Θ) was obtained. For the bidirectional reflectance ρ ″ (θ) of light having a wavelength of 3.9 [μm], the relative emissivity ε _s of the slab 21 is not a relative value by using the knowledge that the emissivity ε _s has a constant value. I tried to get it in real value. Therefore, the emissivity ε _s and the bidirectional reflectance ρ ″ (θ) of the slab 21 can be made as accurate as possible. Therefore, the calculation accuracy of the surface temperature of the slab 21 can be further improved.

In the present embodiment, the radiation thermometer 100 detects the light from the slab 21 having a surface temperature of 700 [° C.] or higher, preferably 900 [° C.] or higher. Therefore, a temperature measurement error caused by variation in emissivity ε _s can be further reduced. Therefore, the calculation accuracy of the surface temperature of the slab 21 can be further improved.

  In the present embodiment, the multiband walking beam type continuous heating furnace 10 has been described as an example of an application target of the surface temperature measurement system. However, the application target of the surface temperature measurement system of the present embodiment is not limited to the multiband walking beam type continuous heating furnace 10. For example, the surface temperature measurement system of the present embodiment can be applied to a furnace other than the gas-fired heating furnace as long as the object to be measured is present, such as a vacuum furnace or a radiant tube furnace. When the surface temperature measurement system of this embodiment is applied to a vacuum furnace or a radiant tube furnace that is not a gas-fired heating furnace, the influence of “stray light noise brightness based on burner flame or combustion gas” is negligibly small (or does not exist). Therefore, when the surface temperature measurement system of this embodiment is applied to a vacuum furnace or a radiant tube furnace that is not a gas-fired heating furnace, the radiation thermometer 100 detects wavelengths other than 3.9 [μm]. Also good.

  In the present embodiment, the thermocouple 200 is attached to the ceiling surface 13a of the heating zone 13. However, if the temperature of the ceiling surface 13a of the heating zone 13 can be measured directly or indirectly, this is not necessarily the case. You don't have to. For example, a thermocouple may be embedded in the ceiling of the heating zone 13. Further, it is not always necessary to use a thermocouple as a means for measuring the temperature.

Further, as in the present embodiment, twelve thermocouples 200a to 200l are scattered in a substantially lattice pattern on the ceiling surface 13a of the heating zone 13 so as to enter the inside of the virtual cone 41 ( If the temperature measurement target area 210 of the thermocouple 200 is set), the measurement area of the slab 21 can be accurately measured with sufficient accuracy without performing a large-scale operation such as installing the thermocouple 200 in a wide range. The surface temperature T _s can be obtained, which is preferable. However, this is not always necessary. For example, when the calculation accuracy of the surface temperature T _s of the measurement area of the slab 21 needs to be further improved, the value on the right side of (1) needs to be larger than 0.7. In this case, the thermocouples 200 can be scattered on the ceiling surface 13a of the heating zone 13 so that the zenith angle θ enters the inside of the cone larger than 45 [°].

Further, in the present embodiment, the boundaries of the zones A to L are the intermediate positions of the thermocouples 200a to 200l, but it is not always necessary to do so.
Furthermore, in the present embodiment, the thermocouples 200a to 200l are installed at the centers (centers of gravity) of the zones A to L, but it is not always necessary to do so. In such a case, extrapolate the temperature of the thermocouples 200a to 200l, or perform interpolation based on the temperature of the thermocouples 200a to 200l to obtain the temperature at the required position, etc. You may make it obtain | require the temperature of a representative point (for example, a center position or a gravity center position).

Further, if the shapes of the zones A to L are rectangular as in the present embodiment, the area A _ij of the zones A to L can be easily calculated. However, the shapes of the zones A to L are not limited to rectangles. , Polygons other than rectangles, circles, sectors, and the like.
In the present embodiment, the thermocouples 200 are regularly installed at intervals of 1 [m]. However, if the thermocouples 200 are installed at positions where the distribution of the furnace wall temperature is seen, the thermocouples are not necessarily provided. It is not necessary to install 200 regularly. For example, the installation interval of the thermocouple 200 can be shortened in a region where the difference in temperature distribution is large, and the installation interval of the thermocouple 200 can be increased in a region where the difference in temperature distribution is small. Further, the number of thermocouples 200 and the number of zones A to L are not limited to “12”.

  In this embodiment, the vertex of the virtual cone 41 is the temperature measurement center point 21a. However, the vertex of the virtual cone 41 is an arbitrary point in the measurement area of the slab 21, or the measurement of the slab 21. It may be the area itself.

Further, as in the present embodiment, for the area of the ceiling surface 13a other than the zones A to L, the average value of the temperatures of the thermocouples 200a, 200d, 200e, 200h to 200l is set to “ceiling surface other than the zones A to L”. 13a is used as the temperature T _o of the region ", if to calculate collectively stray light noise, without placing a thermocouple 200 on the entire ceiling surface 13a of the heating zone 13, the surface temperature of the slab 21 It is preferable because it can be obtained with sufficient accuracy for practical use. However, this is not always necessary. For example, the entire ceiling surface 13 a of the heating zone 13 may be defined as “the temperature measurement target area 210 of the thermocouple 200”, and the thermocouples 200 may be scattered throughout the ceiling surface 13 a of the heating zone 13. Further, depending on the operating conditions of the heating furnace 10, when there is a region that causes stray light noise in addition to the inside of the virtual cone 41, it causes not only the inside of the virtual cone 41 but also the stray light noise. You may define the temperature measurement object area | region 210 of the thermocouple 200 also in an area | region.

  Moreover, if the radiation thermometer 100 detects the light from the slab 21 whose surface temperature is 700 [° C.] or more, preferably 900 [° C.] or more as in this embodiment, the slab is detected. This is preferable because the calculation accuracy of the surface temperature of 21 can be further improved. However, the surface temperature of the slab 21 is not necessarily 700 [° C.] or higher.

  Further, in the present embodiment, the case where the self-luminous luminance is obtained by using the radiation thermometer 100 has been described as an example. However, if the luminous luminance can be obtained, the radiation thermometer is not necessarily used. For example, a spectral luminance meter can be used.

In the present embodiment, the positions of the zones A to L to which the thermocouples 200a to 200l belong are stored as the installation positions of the twelve thermocouples 200a to 200l. However, the xy with the center of the hole 13b as the origin is stored. You may memorize | store a coordinate as an installation position of 12 thermocouples 200a-200l.
In the present embodiment, the emission luminance is obtained by the radiation thermometer 100. However, this is not always necessary, and the information processing apparatus 500 determines Planck's law from the temperature obtained by the radiation thermometer 100. The emission luminance may be calculated based on the above. In this case, the light emission luminance measuring means is provided in the information processing apparatus 500.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the first embodiment described above, the case where the number of zones A to L is the same as the number of thermocouples 200 has been described as an example. On the other hand, in this embodiment, the zones A to L are further divided so as to define a larger number of zones than the number of thermocouples 200 installed. Therefore, the present embodiment and the first embodiment mainly differ in the zone definition method and the method for determining the temperature T _ij of the representative point of each zone. Therefore, in the description of the present embodiment, the same portions as those of the first embodiment described above are denoted by the same reference numerals as those shown in FIGS. 1 to 8, for example, and detailed description thereof is omitted.

FIG. 9 is a diagram showing an outline of the state of the thermocouples 200 a to 200 l attached to the heating zone 13. In addition, FIG. 9 is a perspective view of the portion where the thermocouples 200a to 200l are attached as seen from obliquely above, as in FIG. 2 (a).
As shown in FIG. 9, also in this embodiment, twelve thermocouples 200 a to 200 l are attached to the ceiling surface 13 a of the heating zone 13 in the same manner as in the first embodiment. Further, the temperature measurement target area 210 of the thermocouple 200 is defined in the same manner as in the first embodiment.

  In the first embodiment described above, the temperature measurement target area 210 of the thermocouple 200 is divided into 12 to define 12 zones A to L, but in this embodiment, 12 zones A to L are defined. Then, it is further divided into four rectangular zones that share the installation position of the thermocouple 200, and a total of 48 rectangular zones are defined. In the example shown in FIG. 9, for example, zone A is divided into four zones A1 to A4, and zone L is made into four zones L1 to L4 (in FIG. 9, for convenience of display). , Only the zones A1 to A4 and L1 to L4 are denoted by reference numerals). In this embodiment, in this way, the temperature measurement target area 210 of the thermocouple 200 is divided to define more zones A1 to L4 than the number of thermocouples 200 installed. These zones A1 to L4 have the same size.

In this case, if the temperatures of the thermocouples 200a to 200l are used as they are as the temperatures T _ij of the representative points (for example, center points) of the zones A1 to L4, the calculation accuracy of the surface temperature T _s of the slab 21 is lowered. . Therefore, in this embodiment, the temperature T _ij of the representative point of each zone A1 to L4 is calculated based on the temperature of the thermocouples 200a to 200l.

More specifically, for example, for the outermost zones (for example, zones A1 to A3 and zones L2 to L4), the temperatures of the two thermocouples 200 on the diagonal passing through the center of the zone, and those A function (straight line) determined by the installation positions of the two thermocouples 200 is extrapolated to obtain the temperature T _ij of the representative point (center point) of the zone. For example, for the zone A1, a function determined by the temperature of the thermocouple 200a, 200f (or 200l) and the installation position of the thermocouple 200a, 200f (or 200l) is obtained, and the obtained function is extrapolated to obtain the function of the zone A1. The temperature corresponding to the representative point (center point) is obtained, and the obtained temperature is set as the temperature T _ij of the representative point of the zone A1. Similarly, for zone A2, a function determined by the temperature of thermocouples 200a and 200i and the installation position of thermocouples 200a and 200i is obtained, and the obtained function is extrapolated to the representative point (center point) of zone A2. The corresponding temperature is obtained, and the obtained temperature is set as the temperature T _ij of the representative point of the zone A2.

On the other hand, for zones other than the outermost zone (for example, zone A4, zone L1), interpolation is performed based on the temperatures of the two thermocouples 200 on the diagonal passing through the center of the zone, The temperature T _ij of the representative point (for example, the center point) is calculated.
More specifically, for example, a function (straight line) determined by the temperatures of two thermocouples 200 on the diagonal passing through the center of the calculation target zone and the installation positions of the two thermocouples 200 is obtained and obtained. From the function, the temperature corresponding to the representative point (center point) of each zone is obtained, and the obtained temperature is set as the temperature T _ij of the representative point of each zone.

More specifically, for example, for zone A4, a function determined by the temperatures of the two thermocouples 200a and 200f (or 200l) and the installation positions of the two thermocouples 200a and 200f (or 200l) is obtained. The temperature corresponding to the representative point (center point) of the zone A4 is obtained from the obtained function, and the obtained temperature is set as the temperature T _ij of the representative point of the zone A4. Similarly, for the zone L1, a function determined by the temperature of the thermocouple 200l, 200f (or 200a) and the installation position of the thermocouple 200l, 200f (or 200a) is obtained, and the representative point of the zone L1 is obtained from the obtained function. The temperature corresponding to (center point) is obtained, and the obtained temperature is set as the temperature T _ij of the representative point of the zone L1.

Based on the temperature T _ij of the representative point of each of the zones A1 to L4 obtained in this way, the first light emission luminance calculating unit 308 outputs the disturbance light luminance I _b (T _ij) emitted from each of the zones A1 to L4. ) Is calculated using equation (3).
The zone-unit stray light noise luminance calculation unit 313 calculates “disturbance light luminance I _b (T _ij ) of each zone A1 to L4” calculated by the first light emission luminance calculation unit 308 and “inside the zone of each zone A1 to L4”. The stray light noise brightness for each zone is calculated by multiplying by the “stray light noise parameter”. Then, when the zone unit stray light noise luminance calculation unit 313 calculates the stray light noise luminance for each zone for all the zones A1 to L4, “additional stray light noise luminance for each zone A1 to L4” is added. To calculate the stray light noise luminance (all zone stray light noise luminance) in all zones A1 to L4.

In this embodiment, the process in the flowchart of FIG. 7 is changed as follows, for example. First, in step S4 in FIG. 7, the temperature T _ij of the representative point of each zone is calculated based on the temperatures of the thermocouples 200a to 200l as described above, and the calculated temperature T _ij is stored in the RAM. To do. In step S9, instead of determining whether or not the variable ij is “12”, it is determined whether or not the variable ij is “48”. In the example shown in FIG. 9, the number of zones A1 to L4 is “48”.

  As described above, in the present embodiment, the zones A1 to L4 having a number larger than the number of thermocouples 200 installed are defined in the temperature measurement target region 210, and the stray light noise luminance is obtained for each zone. Therefore, it is possible to improve the calculation accuracy of the stray light noise luminance for each zone as compared with the first embodiment.

In the present embodiment, an example has been described in which the zones A to L are further divided into four to define more zones A1 to A4 than the number of thermocouples 200 installed. However, if the number of zones larger than the number of thermocouples 200 is defined in the temperature measurement target area 210, the way of dividing and the number of zones are not limited to those described above. Moreover, the temperature of the representative point of zone A1-L4 does not necessarily need to be calculated | required by the method mentioned above, if it calculates using the temperature of thermocouple 200a-200l.
Also in the present embodiment, various modifications described in the first embodiment can be employed.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the first embodiment described above, the case where the zones A to L are defined in the temperature measurement target region 210 determined based on the installation positions of the twelve thermocouples 200a to 200l has been described as an example. On the other hand, in this embodiment, zones are defined not only in the temperature measurement target area 210 but also outside the temperature measurement target area 210. Therefore, the present embodiment and the first embodiment mainly differ in the zone definition method and the method for determining the temperature T _ij of the representative point of each zone. Therefore, in the description of the present embodiment, the same parts as those of the first embodiment described above are denoted by the same reference numerals as those shown in FIGS. 1 to 8, for example, and detailed description thereof is omitted.

FIG. 10 is a diagram showing an outline of the state of the thermocouples 200 a to 200 l attached to the heating zone 13. FIG. 10 is a perspective view of the portion to which the thermocouples 200a to 200l are attached as seen from obliquely above, as in FIG. 2 (a).
As shown in FIG. 10, also in the present embodiment, twelve thermocouples 200 a to 200 l are attached to the ceiling surface 13 a of the heating zone 13 in the same manner as in the first embodiment. Further, the temperature measurement target area 210 of the thermocouple 200 is defined in the same manner as in the first embodiment.

  In the first embodiment described above, the temperature measurement target area 210 of the thermocouple 200 is divided into 12 to define 12 zones A to L. However, in this embodiment, 12 zones A to L are defined. In addition, 12 zones M to X are defined outside the temperature measurement target area 210. More specifically, among the zones A to L defined in the temperature measurement target region 210, the same size as the zones A to L at positions adjacent to the outer zones A, D, E, and H to L. The rectangular zones M to X are defined.

In this case, the temperature T _ij of the representative points (for example, the center point) of the zones A to L defined in the temperature measurement target region 210 is the thermocouples 200a to 200l as in the first embodiment. The temperature can be used as it is. On the other hand, when the temperatures of the thermocouples 200a to 200l are used as they are for the temperatures T _ij of the representative points (for example, the center points) of the zones M to X defined outside the temperature measurement target region 210, the surface of the slab 21 is used. The calculation accuracy of the temperature T _s decreases. Therefore, in this embodiment, the temperature T _ij of the representative point of each zone M to X is calculated based on the temperature of the thermocouples 200a to 200l.

More specifically, among the thermocouples 200 aligned in the side direction of the heating zone 13 (direction perpendicular to the conveying direction of the slab 21 (the direction of the arrow in FIG. 10)), the temperature T _ij is determined. A function (straight line) determined by the temperatures of the two thermocouples 200 closest to the zone and the installation positions of the two thermocouples 200 is extrapolated to obtain the temperature T _ij of the representative point (center point) of the zone. To. For example, for the zone Q, a function determined by the temperature of the thermocouples 200a and 200e and the installation position of the thermocouples 200a and 200e is obtained, and the obtained function is extrapolated to correspond to the representative point (center point) of the zone Q. The temperature to be obtained is obtained, and the obtained temperature is set as the temperature T _ij of the representative point of the zone Q. Similarly, for the zone U, a function determined by the temperature of the thermocouples 200i and 200b and the installation position of the thermocouples 200i and 200b is obtained, and the obtained function is extrapolated to the representative point (center point) of the zone U. The corresponding temperature is obtained, and the obtained temperature is set as the temperature T _ij of the representative point of the zone U.

In the example shown in FIG. 10, for the zones M to P, the thermocouples 200 arranged in the side direction of the heating zone 13 (the direction perpendicular to the conveying direction of the slab 21 (the direction of the arrow in FIG. 10)) not exist. Therefore, in the present embodiment, for such zones M to P, the temperature of the two nearest thermocouples 200 among the thermocouples 200 arranged in the transport direction of the slab 21 (the direction of the arrow in FIG. 10). Then, a function (straight line) determined by the installation positions of the two thermocouples 200 is extrapolated to obtain the temperature T _ij of the representative point (center point) of the zone. For example, for the zone M, a function determined by the temperature of the thermocouples 200a and 200b and the installation position of the thermocouples 200a and 200b is obtained, and the obtained function is extrapolated to correspond to the representative point (center point) of the zone M The obtained temperature is obtained, and the obtained temperature is set as the temperature T _ij of the representative point of the zone M.

For the zones A to L, the first emission luminance calculation unit 308 uses the temperatures of the thermocouples 200a to 200l as the temperature T _ij of the representative point of each zone A to L, as in the first embodiment. The disturbance light luminance I _b (T _ij ) emitted from the zones A to L is calculated using the equation (3). Further, the first emission luminance calculation unit 308 emits light from each of the zones M to X based on the temperature T _ij of the representative point of each of the zones M to X obtained as described above. The disturbance light luminance I _b (T _ij ) is calculated using equation (3).

The zone unit stray light noise luminance calculation unit 313 is obtained by the disturbance light luminance I _b (T _ij ) of each zone A to X calculated by the first light emission luminance calculation unit 308 and the stray light noise parameter calculation unit 316. Furthermore, the “stray light noise parameter in each zone A to X” is multiplied to calculate the stray light noise luminance (stray light noise luminance for each zone) based on the light emitted from each zone A to X.
When the zone unit stray light noise luminance calculation unit 313 calculates the stray light noise luminance for each zone for all the zones A to X, the adding unit 314 calculates “stray light noise luminance for each zone” in all the zones A to X. Addition is performed to calculate the stray light noise luminance (all zone stray light noise luminance) in all zones A to X.

In this embodiment, the process in the flowchart of FIG. 7 is changed as follows, for example. First, in step S4 of FIG. 7, for the zones A to L, the temperatures of the thermocouples 200a to 200l are stored in the RAM as the temperatures T _ij of the representative points of the zones A to L. As described above, the zones M to X are calculated based on the temperatures of the thermocouples 200a to 200l, and the calculated temperatures are stored in the RAM as the temperatures T _ij of the representative points of the zones M to X. In step S9, instead of determining whether or not the variable ij is “12”, it is determined whether or not the variable ij is “48”. This is because the number of zones A1 to L4 is “48” in the example shown in FIG.

  As described above, in the present embodiment, in addition to defining zones A to L in the temperature measurement target region 210, zones M to X are also defined outside the temperature measurement target region 210, and each zone A to X is defined. Stray light noise brightness was calculated. Therefore, it is possible to improve the calculation accuracy of the stray light noise luminance for each zone as compared with the first embodiment.

In the present embodiment, among the zones A to L defined in the temperature measurement target region 210, the same as the zones A to L at positions adjacent to the outer zones A, D, E, and H to L. The case where the rectangular zones M to X having the size are defined as zones outside the temperature measurement target area 210 has been described as an example. However, the method for defining the zone outside the temperature measurement target region 210 is not limited to the above-described method. For example, zones may be defined outside the zones M to X. Further, the thorn may be defined so as to be rectangular in the entire zone. In addition, the size, shape, and the like of the zone outside the temperature measurement target region 210 can be freely defined in the same manner as the zone within the temperature measurement target region 210.
Furthermore, in the present embodiment, more zones A to X than the number of thermocouples 200 are defined, but the number of thermocouples 200 and the number of zones may be the same. In this case, a zone that straddles the boundary line of the temperature measurement target area 210 is defined.

Also in the present embodiment, various modifications described in the first embodiment can be employed.
Furthermore, after the number of zones A1 to A4 larger than the number of thermocouples 200 is defined in the temperature measurement target area 210 as in the second embodiment, temperature measurement is performed as in the present embodiment. A zone may be defined outside the target area 210.

Further, in the present embodiment, for example, among the thermocouples 200 arranged in the lateral direction of the heating zone 13, the temperatures of the two thermocouples 200 closest to the zone for which the temperature T _ij is determined, and the two A function (straight line) determined by the installation position of the thermocouple 200 was extrapolated to obtain the temperature T _ij of the representative point (center point) of the zone. However, the method for obtaining the temperature T _ij of the representative point (center point) of the zone is not limited to this. For example, by extrapolating a function (straight line) determined by the temperatures of two thermocouples 200 on the diagonal passing through the center of the zone to be calculated and the installation positions of the two thermocouples 200, a representative point ( The temperature T _ij at the center point may be obtained.

FIG. 11 shows the “surface temperature T _{s of the} measurement area of the slab 21” calculated by the surface temperature measurement system of the first to third embodiments described above, and a thermocouple attached to the surface of the slab 21. It is a figure which shows an example of the relationship with the "surface temperature of the to-be-measured area | region of the slab 21" made. In FIG. 11, as a comparative example, it is assumed that the temperature of the ceiling surface 13 a of the heating zone 13 is uniform. The “surface temperature” is also shown.

In FIG. 11, the “surface temperature T _{s of the} measurement region of the slab 21” (◆, □, Δ) calculated by the surface temperature measurement system of the first to third embodiments and the surface of the slab 21 are attached. The absolute value of the difference from the graph 1101 representing the “surface temperature of the region to be measured of the slab 21” measured by a thermocouple was 10 [° C.] or less. From this, it can be seen that the “surface temperature T _{s of the} region to be measured of the slab 21” calculated by the surface temperature measurement system of the present embodiment has sufficient accuracy for practical use.

  On the other hand, “the surface temperature of the measurement area of the slab 21 obtained by assuming that the temperature of the ceiling surface 13a of the heating zone 13 is uniform with the value of one existing furnace thermometer for furnace temperature control”. The difference between (×) and the graph 1101 representing the “surface temperature of the measurement region of the slab 21” measured by a thermocouple attached to the surface of the slab 21 is 30 [° C.] to 50 [° C. in absolute value. There was a degree. From this, it can be seen that it is difficult to obtain a practically required accuracy by the method of calculating the surface temperature of the slab 21 with the temperature of the ceiling surface 13a of the heating zone 13 causing stray light noise constant. .

Furthermore, the “surface temperature T _{s of the} region to be measured of the slab 21” (□) calculated by the surface temperature measurement system of the second embodiment is the “slab calculated by the surface temperature measurement system of the first embodiment. It was calculated with an accuracy of 1 to 2 [° C.] higher than the surface temperature T _s ”(♦) of 21 measurement areas. Further, the “surface temperature T _{s of the} measurement area of the slab 21” (Δ) calculated by the surface temperature measuring system of the third embodiment is the “slab calculated by the surface temperature measuring system of the first embodiment. It was calculated with a higher accuracy by 2 to 3 [° C.] than the surface temperature T _s ”(♦) of the 21 measurement areas.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. In the first to third embodiments described above, a set of the radiation thermometer 100 and a plurality of thermocouples 200 is provided in the heating zone 13, and the surface temperature T _s in one measurement region is obtained. explained. On the other hand, in the present embodiment, three sets of radiation thermometers and twelve thermocouples are provided in the heating zone 13, and the surface temperature T _s in the three measured regions is obtained in the information processing apparatus. I have to. As described above, the first to third embodiments described above and this embodiment are mainly different in the number of sets of radiation thermometers and twelve thermocouples and a part of the functions of the information processing apparatus 500. . Accordingly, in the description of the present embodiment, the same parts as those of the first embodiment described above are denoted by the same reference numerals as those shown in FIGS. 1 to 11, for example, and detailed description thereof is omitted.

  FIG. 12 is a diagram illustrating an example of a schematic configuration of a multiband walking beam type continuous heating furnace which is an example of an application target of the surface temperature measurement system of the present embodiment. In addition, FIG. 12 is the figure which looked at the heating furnace 10 from the side. FIG. 12 shows only a part of the heating zone 13 (the portion heated by the side burners 17a1 and 17a2) in the multi-band walking beam type continuous heating furnace. The structure of the other parts is the same as that shown in FIG.

  As illustrated in FIG. 12, the surface temperature measurement system according to the present embodiment includes radiation thermometers 101 to 103, a plurality of thermocouples 200, an information processing device 501, and a display device 401. In the present embodiment, as shown in FIGS. 2, 10, and 11, the thermocouple 200 is attached to the ceiling surface 13 a of the heating zone 13. Therefore, the thermocouple 200 does not appear in FIG. In the present embodiment, twelve thermocouples 200a to 200l as shown in FIGS. 2, 10, and 11 are provided for the radiation thermometers 101 to 103, respectively.

  Each of the radiation thermometers 101 to 103 has the same configuration as the radiation thermometer 100 described in the first to third embodiments. The radiation thermometers 101 to 103 have their light incident surfaces 101a to 103a centered 101b to 103b in a transporting direction of the slab 21 so that a predetermined interval is shorter than a transporting distance of the walking beam per slab 21. They are arranged in the direction of the arrow in FIG. And the radiation thermometers 101-103 are respectively the slab 21 conveyed in the heating zone 13 from the upper direction of the heating zone 13 through the holes 13b1-13b3 formed in a part of the ceiling surface 13a of the heating zone 13. It is installed at the position where the surface is desired.

  Moreover, in this embodiment, it is a point on the surface of the slab 21, Comprising: From the point 21a1 to 21a3 in the position which opposes the center 101b-103b of the light-incidence surface 101a-103a of the radiation thermometer 101-103, a radiation thermometer When it is assumed that there is a virtual cone having a zenith angle θ of 45 [°] extending in the direction of 101 to 103, twelve thermocouples 200a to 200l are added so as to enter the inside of the virtual cone. Three sets are attached to the ceiling surface 13a of the tropics 13.

The information processing apparatus 501 acquires the emission luminance measured at approximately the same timing by the three radiation thermometers 101 to 103 and the temperature measured by the thermocouple 200. Then, the information processing apparatus 501 calculates the surface temperatures T _s [K] of the three measured regions using the acquired light emission luminance and temperature in the same manner as in the first to third embodiments described above. . Further, the information processing apparatus 501 calculates the temperature distribution in the width direction (conveyance direction) of the slab 21 in the heating zone 13 using the calculated surface temperature T _s of the measurement area, and displays the calculated temperature distribution on the display device 401. To display.

  In the present embodiment, the walking beam has a heating furnace so that substantially the same region on the surface of the slab 21 faces the centers 101b to 103b of the light incident surfaces 101a to 103a in the three radiation thermometers 101 to 103. The slab 21 is transported within 10. For example, in FIG. 12, when the point 21a1 on the surface of the slab 21 is directly opposed to the center 101b of the light incident surface 101a of the radiation thermometer 101, the radiation thermometers 102, 103 are located at substantially the same position as the point 21a1. The operation of the walking beam is controlled so as to face the centers 102b and 103b of the light incident surfaces 102a and 103a.

The information processing apparatus 501 acquires and stores in advance conveyance operation information indicating the operation of such a walking beam. The information processing apparatus 501 inputs information indicating that the conveyance of the slab 21 is started from the conveyance apparatus, and then, at a predetermined timing according to the stored conveyance operation information, the light emission luminance measured at the timing. To get. Thereby, the light emission luminance measured by the radiation thermometers 101 to 103 with respect to substantially the same region on the surface of the slab 21 is obtained. Further, the information processing apparatus 501 acquires the temperature measured by the thermocouples 201 to 203 at that timing.
Next, the information processing apparatus 501 uses the acquired light emission luminance and temperature in the same manner as in the first to third embodiments described above, and the surface temperature T _s [ K] is calculated three times. Then, the information processing device 501 calculates the temperature history of the slab 21 in the heating zone 13 using the calculated surface temperature T _s of the measured region, and causes the display device 401 to display the calculated temperature history.

As described above, in the present embodiment, the surface temperature T _s of the three measurement regions in the width direction (conveying direction) of the slab 21 is calculated to calculate the temperature distribution in the width direction of the slab 21 in the heating zone 13, The surface temperature T _s [K] in substantially the same measurement area of the slab 21 was calculated three times to calculate the temperature history of the slab 21 in the heating zone 13. Therefore, in addition to the effects described in the first to third embodiments, more detailed information of the slab 21 in the heating zone 13 can be obtained, and the operation in the heating furnace 10 can be performed with higher accuracy.

Further, by calculating the temperature history of the slab 21 in the heating zone 13, the temperature increase rate of the slab 21 can be known, and the operation time in the heating furnace 10 (that is, the extraction time of the slab 21) is as accurate as possible. Can be predicted. Therefore, the operation end time in the heating furnace 10 and the operation start time in the next process (hot rolling process) can be set as accurately as possible. Therefore, the time between the process in the heating furnace 10 and the hot rolling process can be set short, and the productivity of the steel sheet can be improved. Further, for steel materials whose heating temperature history affects the material and quality, fine quality control including the heating temperature history can be realized.
The number of radiation thermometers 101 to 103 and the number of thermocouples 200 are not limited to three. Moreover, the various modifications demonstrated in the 1st-3rd embodiment mentioned above can be taken.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described. In the fourth embodiment described above, in the heating zone 13, three sets of the radiation thermometer and twelve thermocouples are provided in the width direction (conveying direction) of the slab 21, and three sets of information processing devices are provided. The case where the surface temperature T _s in the measurement region is obtained has been described. On the other hand, in this embodiment, three sets of a radiation thermometer and twelve thermocouples are provided in the longitudinal direction of the slab 21. As described above, the fourth embodiment described above and this embodiment are mainly different in the installation position of the combination of the radiation thermometer and the twelve thermocouples and a part of the function of the information processing apparatus 501. Therefore, in the description of this embodiment, the same parts as those in the first to fourth embodiments described above are denoted by the same reference numerals as those shown in FIGS. To do.

  FIG. 13 is a diagram illustrating an example of a schematic configuration of a multiband walking beam type continuous heating furnace which is an example of an application target of the surface temperature measurement system of the present embodiment. FIG. 13 is a view of the heating zone 13 as viewed from the pre-tropical zone 12 side of the heating furnace 10. Moreover, in FIG. 13, only a part of heating zone 13 is shown among multi-band type walking beam type continuous heating furnaces. The structure of the other parts is the same as that shown in FIG.

  As illustrated in FIG. 13, the surface temperature measurement system according to the present embodiment includes radiation thermometers 104 to 106, a plurality of thermocouples 200, an information processing device 502, and a display device 402. In the present embodiment, as shown in FIGS. 2, 10, and 11, the thermocouple 200 is attached to the ceiling surface 13 a of the heating zone 13. Therefore, the thermocouple 200 does not appear in FIG. In the present embodiment, twelve thermocouples 200a to 200l as shown in FIGS. 2, 10, and 11 are provided for the radiation thermometers 104 to 106, respectively.

  The radiation thermometers 104 to 106 have the same configuration as the radiation thermometer 100 described in the first to third embodiments, respectively. The radiation thermometers 104 to 106 are arranged in the longitudinal direction of the slab 21 (perpendicular to the conveying direction). The radiation thermometers 104 to 106 are respectively connected to the slab 21 conveyed from the upper side of the heating zone 13 through the holes 13b4 to 13b6 formed in a part of the ceiling surface 13a of the heating zone 13. It is installed at the position where the surface is desired.

  Further, in the present embodiment, the radiation thermometer is a point on the surface of the slab 21 and from the points 21a4 to 21a6 that are directly opposite to the centers 104b to 106b of the light incident surfaces 104a to 106a of the radiation thermometers 104 to 106. When assuming that there is a virtual cone having a zenith angle θ of 45 [°] extending in the direction of 104 to 106, twelve thermocouples 200 are placed in the heating zone 13 so as to enter the inside of the virtual cone. Three sets are attached to the ceiling surface 13a.

The information processing apparatus 502 acquires the emission luminance measured at approximately the same timing by the three radiation thermometers 104 to 106 and the temperature measured by the thermocouple 200. Then, the information processing apparatus 502 calculates the surface temperatures T _s [K] of the three measured regions using the acquired light emission luminance and temperature in the same manner as in the first to third embodiments described above. . Furthermore, the information processing apparatus 502 calculates the temperature distribution in the longitudinal direction of the slab 21 in the heating zone 13 using the calculated surface temperature T _s of the measurement area, and displays the calculated temperature distribution on the display device 401.

As described above, in the present embodiment, the surface temperature T _s of the three measurement regions in the longitudinal direction of the slab 21 is calculated, and the temperature distribution in the longitudinal direction of the slab 21 in the heating zone 13 is calculated. Therefore, the surface temperature T _s of the tip end portion of the slab 21, the surface temperature T _s of the tail end of the slab 21 can be determined in each substantially the same time, according to the result, the distal end portion side and the tail end The side burners 17a and 17b on the part side can be controlled independently. Thereby, the deviation of the surface temperature in the longitudinal direction of the slab 21 can be further reduced.

  The number of radiation thermometers 104 to 106 and the number of thermocouples 200 are not limited to three. Moreover, the various modifications demonstrated in the 1st-3rd embodiment mentioned above can be taken.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described. In the first to third embodiments described above, a set of the radiation thermometer 100 and a plurality of thermocouples 200 is provided in the heating zone 13, and the surface temperature T _s in one measurement region is obtained. explained. On the other hand, in this embodiment, a set of a radiation thermometer and 12 thermocouples is provided in each of the heating zone 13 and the pretropical zone 12, and in the information processing apparatus, in two measured regions. The surface temperature T _s is obtained. As described above, the first to fifth embodiments and the present embodiment are the number of sets and installation locations of the radiation thermometer and the twelve thermocouples, and one of the functions of the information processing apparatuses 500 to 502. The main part is different. Therefore, in the description of the present embodiment, the same parts as those in the first to third embodiments described above are denoted by the same reference numerals as those in FIGS. To do.

  FIG. 14 is a diagram illustrating an example of a schematic configuration of a multi-band walking beam continuous heating furnace which is an example of an application target of the surface temperature measurement system of the present embodiment. In addition, FIG. 14 is the figure which looked at the heating furnace 10 from the side.

  As shown in FIG. 14, the surface temperature measurement system according to this embodiment includes radiation thermometers 100 and 107, a plurality of thermocouples 200, an information processing device 503, and a display device 403. In the present embodiment, as shown in FIGS. 2, 10, and 11, the thermocouple 200 is attached to the ceiling surface 13 a of the heating zone 13. Furthermore, in the present embodiment, the thermocouple 200 is also attached to the ceiling surface 12a of the pre-tropical zone 12 as shown in FIGS. That is, in this embodiment, twelve thermocouples 200a to 200l as shown in FIGS. 2, 10, and 11 are provided for the radiation thermometers 100 and 107, respectively. Therefore, the thermocouple 200 does not appear in FIG.

As explained in the first to third embodiments, the radiation thermometer 100 passes through the inside of the heating zone 13 from above the heating zone 13 through the hole 13b formed in a part of the ceiling surface 13a of the heating zone 13. It is installed at a position where the surface of the slab 21 to be conveyed is desired.
The radiation thermometer 107 has the same configuration as the radiation thermometer 100 described in the first embodiment. The radiation thermometer 107 is installed from above the pretropical zone 12 through a hole 12b formed in a part of the ceiling surface 12a of the pretropical zone 12 at a position where the surface of the slab 21 conveyed in the pretropical zone 12 is desired. Yes.

Further, as described in the first to third embodiments, from the point 21a8 which is a point on the surface of the slab 21 and is directly opposite the center 100b of the light incident surface 100a of the radiation thermometer 100, the radiation temperature When assuming that there is a virtual cone having a zenith angle θ of 45 [°] extending in the direction of the total 100, the twelve thermocouples 200a to 200i are placed in the heating zone so as to enter the inside of the virtual cone. It can be attached to 13 ceiling surfaces 13a.
On the other hand, on the ceiling surface 12a of the pre-tropical zone 12, the zenith angle θ that spreads in the direction of the radiation thermometer 100 from the point 21a7 that faces the center 107b of the light incident surface 107a of the radiation thermometer 107 is 45 [°]. 12 thermocouples 200a to 200l are attached so as to enter the inside of the virtual cone.

  In the present embodiment, the walking beam is placed in the heating furnace 10 so that substantially the same region on the surface of the slab 21 faces the centers 100b and 107b of the light incident surfaces 100a and 107a of the two radiation thermometers 100 and 107. Then, the slab 21 is conveyed. For example, in FIG. 14, when the point 21a7 on the surface of the slab 21 is directly opposed to the center 107b of the light incident surface 107a in the radiation thermometer 107, the position substantially the same as the point 21a7 is The operation of the walking beam is controlled so as to face the center 100b of the light surface 100a.

  The information processing device 503 acquires and stores in advance conveyance operation information indicating the operation of such a walking beam. The information processing device 503 inputs information indicating that the conveyance of the slab 21 is started from the conveyance device, and then, at a predetermined timing according to the stored conveyance operation information, the light emission luminance measured at that timing. To get. Thereby, the light emission luminance measured by the radiation thermometers 100 and 107 with respect to substantially the same region on the surface of the slab 21 is obtained. Further, the information processing device 503 acquires the temperature measured by the thermocouple 200 at that timing.

Next, the information processing apparatus 503 uses the acquired light emission luminance and temperature in the same manner as in the first to third embodiments described above, and the surface temperature T _s [ K] is calculated twice. Then, the information processing device 503 calculates the temperature history of the slab 21 in the pre-tropical zone 12 and the heating zone 13 using the calculated surface temperature T _s of the measured region, and causes the display device 403 to display the calculated temperature history. .

As described above, in the present embodiment, the temperature history of the slab 21 is calculated by calculating the surface temperature T _s [K] in substantially the same measurement area of the slab 21 twice in the pre-tropical zone 12 and the heating zone 13. I did it. Therefore, the temperature increase rate of the slab 21 from the pre-tropical zone 12 to the heating zone 13 can be known, and the operation time in the heating furnace 10 (that is, the extraction time of the slab 21) can be accurately predicted.

In this embodiment, two sets of the radiation thermometer and the twelve thermocouples are provided in the heating zone 13 and the pre-tropical zone 12, but it is not always necessary to do so. For example, a combination of a radiation thermometer and 12 thermocouples may be provided in the soaking zone 14 in addition to the heating zone 13 and the pre-tropical zone 12. Further, a combination of a radiation thermometer and 12 thermocouples may be provided in the heating zone 13 and the soaking zone 14 or the pre-tropical zone 12 and the soaking zone 14. Moreover, the various modifications demonstrated in the 1st-3rd embodiment mentioned above can be taken. Further, a combination of a radiation thermometer and 12 thermocouples may be provided between the pre-tropical zone 12 and the heating zone 13 or between the heating zone 13 and the soaking zone 14.
Furthermore, the surface temperature measurement system can be configured by combining at least any two of the fourth to sixth embodiments.
In the fourth embodiment, a plurality of sets of radiation thermometers 101 to 103 and thermocouples 200 are provided in the width direction of the slab 21, and in the fifth embodiment, the radiation thermometers 104 to 106, The case where a plurality of sets of thermocouples 200 are provided in the longitudinal direction of the slab 21 has been described as an example. However, a plurality of sets of radiation thermometers and twelve thermocouples are arranged in any direction of the slab 21. It can also be provided.
In the first to sixth embodiments described above, the case where the side burner 17 is provided below the slab 21 has been described as an example. However, the side burner 17 is provided above the slab 21. May be.

The embodiment of the present invention described above can be realized by a computer executing a program. Further, means for supplying a program to a computer, for example, a computer-readable recording medium such as a CD-ROM recording such a program, or a transmission medium for transmitting such a program can also be applied as an embodiment of the present invention. . A program product such as a computer-readable recording medium in which the program is recorded can also be applied as an embodiment of the present invention. The above programs, computer-readable recording media, transmission media, and program products are included in the scope of the present invention.
In addition, the above-described embodiments are merely examples of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed as being limited thereto. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the 1st Embodiment of this invention and shows an example of schematic structure of the multiband type walking beam type continuous heating furnace which is an example of the application object of a surface temperature measurement system. It is a figure which shows the 1st Embodiment of this invention and shows the outline of the mode of the thermocouple attached to the heating zone. It is a figure which shows the 1st Embodiment of this invention and demonstrates an example of the range to which 12 thermocouples are attached. The 1st Embodiment of this invention is a figure which shows an example of the relationship between the incident angle (zenith angle) of the light whose wavelength is 3.9 [micrometers], and the relative value of the bidirectional reflectance of the light. is there. 1 is a block diagram illustrating an example of a functional configuration of an information processing apparatus according to a first embodiment of this invention. It is a figure which shows the 1st Embodiment of this invention and shows an example of the memory content of a parameter memory | storage part. 5 is a flowchart illustrating an example of a processing operation in the information processing apparatus according to the first embodiment of this invention. It is a figure which shows the 1st Embodiment of this invention and shows an example of the relationship between what expressed the difference of the calculated value and true value of the surface temperature of a slab with an absolute value, and the true value of the surface temperature of a slab. . It is a figure which shows the 2nd Embodiment of this invention and shows the outline of the mode of the thermocouple attached to the heating zone. It is a figure which shows the 3rd Embodiment of this invention and shows the outline of the mode of the thermocouple attached to the heating zone. The 1st-3rd embodiment of this invention is shown, and "surface temperature of the to-be-measured area | region of a slab" calculated by the surface temperature measurement system and "slab of the slab" measured with the thermocouple attached to the surface of the slab It is a figure which shows an example of a relationship with "the surface temperature of a to-be-measured area". It is a figure which shows the 4th Embodiment of this invention and shows an example of schematic structure of the multiband type walking beam type continuous heating furnace which is an example of the application object of a surface temperature measurement system. It is a figure which shows the 5th Embodiment of this invention and shows an example of schematic structure of the multiband type walking beam type continuous heating furnace which is an example of the application object of a surface temperature measurement system. It is a figure which shows the 6th Embodiment of this invention and shows an example of schematic structure of the multiband type walking beam type | mold continuous heating furnace which is an example of the application object of a surface temperature measurement system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Heating furnace 11 Non-combustion zone 12 Pre-tropical zone 12a Ceiling surface 12b Hole 13 formed in the ceiling surface Heating zone 13a Ceiling surface 13b Hole 13c formed in the ceiling surface 14 Any point on the ceiling surface 14 Soaking zone 15 Axial flow burner 16 Roof burner 17 Side burner 21 Slab 21a Temperature measurement center point 41 Virtual cone 91 Graph 92 showing an error between the calculated value of the surface temperature of the slab and the true value when the actual emissivity is 0.87 Graphs 100 to 107 showing errors between the calculated value and the true value of the surface temperature of the slab when the emissivity is 0.83 Radiation thermometers 100a to 107a Light incident surfaces 100b to 107b of the radiation thermometer Radiation thermometer The center 200 of the light incident surface 200 Thermocouple 301 Luminance acquisition unit 302 Thermocouple temperature acquisition unit 303 Thermocouple position storage unit 304 Emissivity storage unit 305 Bidirectional reflectance guide Unit 306 parameter calculation unit 307 parameter storage unit 308 first emission luminance calculation unit 309 second emission luminance calculation unit 310 third emission luminance calculation unit 311 surface temperature calculation unit 312 surface temperature display units 400 to 403 display device 500 to 503 Information processing device θ Virtual cone zenith angle

Claims (23)

Temperature measuring means using a plurality of thermocouples for measuring the temperature of a region that generates disturbance light incident on the surface of the object to be measured being heated in the heating furnace ;
A light emission luminance measuring means for measuring light emission luminance of light having a specific wavelength, in which light emission and absorption of gas is smaller than other wavelength bands among light having a wavelength emitted from the object to be measured,
Emissivity storage means for storing in advance the emissivity of the surface of the object to be measured;
Stray light noise calculation means for calculating the stray light noise brightness reflected on the surface of the object to be measured by the light emission brightness measurement means using the temperature measured by the temperature measurement means by the plurality of thermocouples ;
Of the light emission luminances measured by the light emission luminance measurement means, the self light emission luminance generated from the measured object itself is measured by the stray light noise luminance calculated by the stray light noise calculation means and the light emission luminance measurement means. Self-luminous luminance calculation means for calculating using the emitted luminance and the emissivity of the surface of the object to be measured ;
An object to be measured having surface temperature calculation means for calculating the surface temperature of the object to be measured using the self-luminance brightness calculated by the light emission luminance calculation means and the emissivity of the surface of the object to be measured; A surface temperature measurement system for measuring the surface temperature of
The stray light noise calculating means includes:
Of the region that generates the disturbance light, the region including the temperature measurement target region by the temperature measuring means using the plurality of thermocouples is divided into a plurality of zones, and the divided zones are reflected on the surface of the object to be measured. the stray light noise luminance calculated, by adding the stray noise intensity for each said zone, and zone stray noise calculating means asking you to stray noise intensity due to the zone,
Out-of-zone stray light noise calculation means for calculating the stray light noise brightness reflected from the surface of the object to be measured due to the out-of-zone area out of the disturbance light generation area;
Bidirectional reflectance deriving means for deriving the bidirectional reflectance of the object to be measured in the light of the specific wavelength;
Solid angle storage means for preliminarily storing, for each zone, a solid angle for viewing the representative point of the zone from the measurement point of the light emission luminance measuring means ,
The calculation of the stray light noise luminance for each zone in the zone stray light noise calculation means is performed by calculating the disturbance light luminance for each zone calculated from the temperature of the representative point for each zone, the bidirectional reflectance, and the zone to be calculated. With the solid angle at every
In the extra-zone stray light noise calculation means, the calculation of the stray light noise luminance due to the area outside the zone is performed by calculating the luminance of the disturbance light in the area outside the zone calculated from the temperature of the representative point outside the zone, and the measured object. Performed using the emissivity of the surface of the object, the bidirectional reflectance, and the solid angle for each zone to be calculated,
And stray light noise intensity due to the zone, by adding the stray noise brightness caused outside the zone, the surface temperature measurement system and calculates the stray noise intensity reflected by the surface of the object to be measured. The zone stray light noise calculation unit calculates the stray light noise luminance reflected from the surface of the object to be measured for each zone obtained by dividing the temperature measurement target region by the plurality of temperature measurement units into a plurality of zones. 2. The surface temperature measurement system according to 1. The zone stray light noise calculating means calculates the stray light noise luminance reflected from the surface of the object to be measured for each zone obtained by dividing a region wider than the temperature measurement target area by the plurality of temperature measuring means into a plurality of zones. The surface temperature measurement system according to claim 1 . The number of the zones, the surface temperature measuring system according to claim 2 or 3, characterized in that it is equal to the number of said plurality of temperature measuring means. The surface temperature measuring system according to claim 2 or 3 , wherein the number of the zones is larger than the number of the plurality of temperature measuring means. The emission luminance measuring means, the detection surface of the light, the surface temperature measurement, wherein in any one of claim 1 to 5, characterized in that provided in the measurement area of the object to be measured and the position facing system. When it is considered that there is a cone having a zenith angle of 45 [°] extending in the direction of the light emission luminance measuring means from a point in the measurement area of the object to be measured, The surface temperature measurement system according to any one of claims 1 to 6 , wherein the plurality of temperature measurement means are interspersed so that a temperature measurement target region of the temperature measurement means exists. . The light emission luminance measuring means is provided at a position where the light detection surface is desired from above the heating furnace, through a hole opened in the ceiling of the heating furnace, to the object to be measured in the heating furnace,
The plurality of temperature measuring means is provided on a furnace wall of a ceiling of the heating furnace,
The object to be measured is a steel material heated in a gas-fired heating furnace,
The surface temperature measurement system according to any one of claims 1 to 7 , wherein the specific wavelength measured by the light emission luminance measuring means is approximately 3.9 [µm]. A surface temperature measurement system comprising a plurality of sets of the surface temperature measurement system according to any one of claims 1 to 8 . A surface temperature measuring system according to claim 9, and a light-emitting luminance measurement means in the surface temperature measuring system according to any one of claim 1 to 9 and a plurality of temperature measuring means, the longitudinal of said heating furnace A surface temperature measurement system, which is arranged in one or both of the direction and the width direction and has a function of executing measurement of the surface temperature of an object to be measured at a predetermined timing. A heating furnace comprising the surface temperature measurement system according to any one of claims 1 to 10 . A temperature measuring step for measuring the temperature of a region that generates disturbance light incident on the surface of the object to be measured being heated in the heating furnace, using temperature measuring means using a plurality of thermocouples;
A light emission luminance measuring step of measuring the light emission luminance of light having a specific wavelength smaller than the other wavelength bands among the light of the wavelength emitted from the object to be measured by the light emission luminance measuring means,
An emissivity storage step for preliminarily storing the emissivity of the surface of the object to be measured;
A stray light noise calculation step for calculating the stray light noise luminance reflected to the light emission luminance measurement means on the surface of the object to be measured using the temperature measured by the temperature measurement step by the plurality of thermocouples;
Among the light emission luminances measured in the light emission luminance measurement step, the self light emission luminance generated from the measured object itself is measured by the stray light noise luminance calculated by the stray light noise calculation step and the light emission luminance measurement step. A self-luminous luminance calculation step for calculating using the emitted luminance and the emissivity of the surface of the measured object;
An object to be measured having a surface temperature calculation step of calculating a surface temperature of the object to be measured using the self-luminance brightness calculated in the self-luminance luminance calculation step and the emissivity of the surface of the object to be measured; A surface temperature measuring method for measuring the surface temperature of
The stray light noise calculation step includes:
Of the region that generates the disturbance light, the region including the temperature measurement target region by the temperature measuring means using the plurality of thermocouples is divided into a plurality of zones, and the divided zones are reflected on the surface of the object to be measured. A zone stray light noise calculation step for calculating the stray light noise brightness, adding the stray light noise brightness for each zone , and obtaining the stray light noise brightness due to the zone, and
Out-of-zone stray light noise calculation step for calculating the stray light noise brightness reflected on the surface of the object to be measured due to the out-of-zone area among the areas where the disturbance light is generated;
A bidirectional reflectance derivation step for deriving a bidirectional reflectance of the object to be measured in the light of the specific wavelength;
A solid angle storage step for preliminarily storing, for each zone, a solid angle for viewing the representative point of the zone from the measurement point of the light emission luminance measuring means,
The calculation of the stray light noise luminance for each zone in the zone stray light noise calculation step is performed by calculating the disturbance light luminance for each zone calculated from the temperature of the representative point for each zone, the bidirectional reflectance, and the zone to be calculated. With the solid angle at every
In the extra-zone stray light noise calculation step, the stray light noise luminance due to the area outside the zone is calculated from the disturbance light luminance in the area outside the zone calculated from the temperature of the representative point outside the zone, and the measurement target. Performed using the emissivity of the surface of the object, the bidirectional reflectance, and the solid angle for each zone to be calculated,
A method of measuring a surface temperature, wherein the stray light noise luminance caused by the zone and the stray light noise luminance caused by the outside of the zone are added to calculate the stray light noise luminance reflected from the surface of the object to be measured. The zone stray light noise calculation step calculates the luminance of stray light noise reflected from the surface of the object to be measured for each zone obtained by dividing the temperature measurement target region by the plurality of temperature measuring means into a plurality of zones. 12. The surface temperature measuring method according to 12 . In the zone stray light noise calculation step, the stray light noise brightness reflected from the surface of the object to be measured is calculated for each zone obtained by dividing a region wider than the temperature measurement target region by the plurality of temperature measuring means into a plurality of zones. The surface temperature measuring method according to claim 12 . The number of the zones, the surface temperature measuring method according to claim 13 or 14, characterized in that it is equal to the number of said plurality of temperature measuring means. The number of the zones, the surface temperature measuring method according to claim 13 or 14, characterized in that more than the number of said plurality of temperature measuring means. The surface temperature measurement according to any one of claims 12 to 16 , wherein the light emission luminance measuring means has a light detection surface provided at a position facing a measurement area of the measurement object. Method. When it is considered that there is a cone having a zenith angle of 45 [°] extending in the direction of the emission luminance measurement step from a point in the measurement region of the object to be measured, The surface temperature measurement method according to any one of claims 12 to 17 , wherein the plurality of temperature measurement means are interspersed so that a temperature measurement target region of the temperature measurement means exists. . The light emission luminance measuring means is provided at a position where the light detection surface is desired from above the heating furnace, through a hole opened in the ceiling of the heating furnace, to the object to be measured in the heating furnace,
The plurality of temperature measuring means is provided on a furnace wall of a ceiling of the heating furnace,
The object to be measured is a steel material heated in a gas-fired heating furnace,
The surface temperature measuring method according to any one of claims 12 to 18 , wherein the specific wavelength measured by the emission luminance measuring means is approximately 3.9 [µm]. The surface temperature measurement method according to any one of claims 12 to 19 , wherein in the emission luminance measurement step, light incident from an object to be measured heated to 700 [° C] or higher is detected. A plurality of sets of light emission luminance measurement means and a plurality of temperature measurement means in the surface temperature measurement system according to any one of claims 1 to 10 are arranged side by side in the conveyance direction of the object to be measured in the heating furnace, A method for measuring a surface temperature, characterized in that a temperature history of an object to be measured is measured by measuring the temperature of substantially the same part of the object at a predetermined timing. A light emission luminance measuring means and a plurality of temperature measuring means in the surface temperature measuring system according to any one of claims 1 to 10 , wherein a plurality of sets are arranged in an arbitrary direction, and different regions of an object to be measured are arranged. A method for measuring a surface temperature, which measures temperature distribution in an arbitrary direction of an object to be measured by simultaneously measuring temperature. A light emission luminance measuring means for measuring light emission luminance of light of a specific wavelength in which light emission and absorption of gas is smaller than other wavelength bands among light of a wavelength emitted from an object to be measured heated in a heating furnace; ,
Measuring the surface temperature of the object to be measured using measured values in a plurality of thermocouple temperature measuring means for measuring the temperature of a region in which disturbance light incident on the surface of the object to be measured is generated. A computer program for executing the program,
An emissivity storage step for preliminarily storing the emissivity of the surface of the object to be measured;
A stray light noise calculation step for calculating the stray light noise luminance reflected from the surface of the object to be measured to the light emission luminance measuring means using the temperature measured by the temperature measuring means using the plurality of thermocouples;
Of the light emission luminance measured by the light emission luminance measurement means, the self light emission luminance generated from the measured object itself is measured by the stray light noise luminance calculated by the stray light noise calculation step and the light emission luminance measurement means. A self-luminous luminance calculation step for calculating using the emitted luminance and the emissivity of the surface of the measured object;
Using the self-luminous luminance calculated in the self-luminous luminance calculation step and the surface emissivity of the surface of the object to be measured, causing the computer to execute a surface temperature calculating step of calculating the surface temperature of the object to be measured,
The stray light noise calculation step includes:
Of the region that generates the disturbance light, the region including the temperature measurement target region by the temperature measuring means using the plurality of thermocouples is divided into a plurality of zones, and the divided zones are reflected on the surface of the object to be measured. A zone stray light noise calculation step for calculating the stray light noise brightness, adding the stray light noise brightness for each zone , and obtaining the stray light noise brightness due to the zone, and
Out-of-zone stray light noise calculation step for calculating the stray light noise brightness reflected on the surface of the object to be measured due to the out-of-zone area among the areas where the disturbance light is generated;
A bidirectional reflectance derivation step for deriving a bidirectional reflectance of the object to be measured in the light of the specific wavelength;
A solid angle storage step for preliminarily storing, for each zone, a solid angle for viewing the representative point of the zone from the measurement point of the light emission luminance measuring means,
The calculation of the stray light noise luminance for each zone in the zone stray light noise calculation step is performed by calculating the disturbance light luminance for each zone calculated from the temperature of the representative point for each zone, the bidirectional reflectance, and the zone to be calculated. And calculated using the solid angle at every
In the extra-zone stray light noise calculation step, the stray light noise luminance due to the area outside the zone is calculated from the disturbance light luminance in the area outside the zone calculated from the temperature of the representative point outside the zone, and the measurement target. Performed using the emissivity of the surface of the object, the bidirectional reflectance, and the solid angle for each zone to be calculated,
A computer program for calculating the stray light noise luminance reflected on the surface of the object to be measured by adding the stray light noise luminance due to the zone and the stray light noise luminance due to the outside of the zone.

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