JP6520618B2 - Steel material temperature measuring device and steel material temperature measuring method - Google Patents

Description

  The present invention relates to a steel material temperature measuring device and a steel material temperature measuring method.

  In order to measure the temperature of an object of interest without contact, various temperature measurement methods using various electromagnetic waves have been proposed.

  For example, in Patent Document 1 below, in order to measure the temperature inside the tire, the radiation signal intensity of the electromagnetic wave in the microwave band including the temperature information inside the tire and the electromagnetic wave in the infrared band for obtaining the temperature information on the tire surface A technique has been proposed for calculating the temperature inside the tire based on the radiation signal intensity and the tire shape.

  Further, in Patent Document 2 below, dust, mist, and the like are measured by using the electromagnetic wave in the microwave and millimeter wave bands and measuring the surface of the steel material in a state in which the scale present on the steel material surface has a predetermined thickness or more There has been proposed a technology capable of measuring the temperature of the surface of the steel without contact, without being affected by the emissivity of the surface of the steel, even in an adverse environment where steam or the like is present.

Japanese Patent Application Laid-Open No. 60-39514 JP, 2013-11503, A

  The inventor examined the temperature measurement of various steel products manufactured in various manufacturing processes, using the technology proposed in Patent Document 2 described above. As a result, as described below, the inventor of the present invention stabilizes the state of the scale formed on the surface of the steel material when measuring the surface temperature during mist cooling of the steel material manufactured according to a specific manufacturing process. It has been found for the first time that even if the technique proposed in Patent Document 2 described above is used, a large amount of error is included in the temperature measurement value. The fact that the state of scale formed on the surface of the steel is not stable means that the emissivity of the surface of the steel fluctuates and is not stable. Therefore, the inventor is included in the measurement values in the above situation. We came to the conclusion that some processing was necessary to remove the error.

  Here, in the technique proposed in Patent Document 1, the measured value of the surface temperature of the tire obtained using the electromagnetic wave in the infrared band is the inside of the tire obtained using the electromagnetic wave in the microwave band It is used as a means to correct the temperature of However, in Patent Document 1 described above, the temperatures of different objects such as the tire surface and the inside of the tire are measured, and the other measurement temperature is corrected based on one measurement temperature. It is not a technology to compensate for fluctuations. Therefore, even if the technique proposed in Patent Document 1 is combined with the technique proposed in Patent Document 2, it is not possible to remove the measurement error caused by the fluctuation of the emissivity.

  The present invention has been made in view of the above situation, and the object of the present invention is to provide a steel material during mist cooling even when the state of the scale formed on the surface of the steel material changes. It is an object of the present invention to provide a steel material temperature measuring device and a steel material temperature measuring method capable of measuring the surface temperature of the steel sheet more accurately.

  In order to solve the above-mentioned subject, according to one viewpoint of the present invention, in the cooling process which carries out mist cooling of hot rolled rolled steel material, the steel material temperature measuring device which measures the surface temperature of the rolled steel material during mist cooling A radiation thermometer for measuring the surface temperature of the rolled steel immediately before being subjected to mist cooling, and microwaves emitted from the rolled steel immediately before being subjected to mist cooling, and during the mist cooling An electromagnetic wave intensity measuring device for measuring the intensity of an electromagnetic wave belonging to the wave band, and an operation for calculating the surface temperature of the rolled steel during mist cooling using the measured intensity of the electromagnetic wave belonging to the microwave to millimeter wave band A processing device, and the arithmetic processing device measures the intensity of the electromagnetic wave of the rolled steel material immediately before being subjected to the mist cooling and the radiation temperature, which are measured by the electromagnetic wave intensity measuring device. The surface temperature of the rolled steel during mist cooling is calculated using the surface temperature of the rolled steel by a gauge and the intensity of the electromagnetic wave of the rolled steel during mist cooling measured by the electromagnetic wave intensity measuring device The steel material temperature measuring device which has the surface temperature calculation part which is done is provided.

The surface temperature calculation unit sets the intensity of the electromagnetic wave of the rolled steel immediately before being subjected to mist cooling to S _0, and the intensity of the electromagnetic wave of the rolled steel during mist cooling to S _c, and the rolling by the radiation thermometer When the surface temperature of the steel material is T ₀ , the surface temperature T _c of the rolled steel material during mist cooling may be calculated by arithmetic processing of T _c = S _c × (T ₀ / S ₀ ).

The surface temperature calculation unit sets the intensity of the electromagnetic wave of the rolled steel material immediately before being subjected to mist cooling to S _0, and the surface temperature of the rolled steel material according to the radiation thermometer to T ₀ , A = (T _{0 /} S ₀₎ is expressed by calculating a correction coefficient a, the intensity of the electromagnetic wave of the rolled steel in mist cooling when the S _c, the surface temperature T _c of the rolled steel in mist cooling, T _c It may be calculated by arithmetic processing of = A × S _c .

  The electromagnetic wave intensity measuring device preferably detects an electromagnetic wave having a frequency of 1 GHz to 200 GHz as the electromagnetic wave belonging to the microwave to millimeter wave band, and measures the intensity of the electromagnetic wave having a frequency of 1 GHz to 200 GHz.

  It is preferable that the radiation thermometer and the electromagnetic wave intensity measuring device be arranged such that the respective measurement ranges of the rolled steel material substantially coincide with each other.

  The electromagnetic wave intensity measuring device is preferably an electromagnetic wave detector using a direct detection method or a heterodyne method.

  The rolled steel may be a rail.

  Moreover, in order to solve the above-mentioned subject, according to another viewpoint of the present invention, in the cooling process which carries out mist cooling of hot rolled rolled steel material, steel material temperature which measures surface temperature of the rolled steel during mist cooling An electromagnetic wave intensity measuring device for measuring the surface temperature of the rolled steel material immediately before being subjected to mist cooling, the intensity of an electromagnetic wave belonging to a microwave to a millimeter wave band radiated from the rolled steel material; Measured by both of the radiation thermometers, the intensity of the electromagnetic wave belonging to the microwave to millimeter wave band radiated from the rolled steel during mist cooling is measured by the electromagnetic wave intensity measuring device, and is measured by the electromagnetic wave intensity measuring device. Also, the strength of the electromagnetic wave of the rolled steel just before being subjected to mist cooling, the surface temperature of the rolled steel by the radiation thermometer, and the measurement by the electromagnetic wave intensity measuring device Is, an electromagnetic wave of strength of the rolled steel in mist cooling, using a steel material temperature measuring method for calculating the surface temperature of the rolled steel in mist cooling is provided.

  As described above, according to the present invention, it is possible to more accurately measure the surface temperature of the steel during mist cooling, even when the state of the scale generated on the surface of the steel changes.

It is a graph for demonstrating the radiation law of Plank. It is the graph which showed the relationship between electromagnetic waves and temperature of a microwave-millimeter wave band. It is an explanatory view for explaining the receiving intensity of electromagnetic waves. It is an explanatory view for explaining a study result about temperature measurement using electromagnetic waves of a microwave-a millimeter wave zone. It is an explanatory view for explaining a study result about temperature measurement using electromagnetic waves of a microwave-a millimeter wave zone. It is an explanatory view showing typically composition of a steel material temperature measuring device concerning an embodiment of the present invention. It is a block diagram showing an example of composition of an electromagnetic wave intensity measuring device concerning the embodiment. It is a block diagram showing an example of composition of an electromagnetic wave intensity measuring device concerning the embodiment. It is the block diagram which showed an example of a structure of the arithmetic processing unit concerning the embodiment. It is the flowchart which showed an example of the flow of the electromagnetic wave intensity measuring method which concerns on the embodiment. It is the block diagram which showed an example of the hardware constitutions of the arithmetic processing unit concerning the embodiment. It is an explanatory view for explaining an example. It is the graph which showed the measurement result before amendment obtained by the example. It is the graph which showed the measurement result after correction | amendment obtained in the Example.

  The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. In the present specification and the drawings, components having substantially the same functional configuration will be assigned the same reference numerals and redundant description will be omitted.

(Study on electromagnetic waves in the microwave and millimeter wave bands)
In the following, prior to describing the steel material temperature measuring method and the steel material temperature measuring apparatus according to the embodiment of the present invention, the electromagnetic waves in the microwave to millimeter wave band performed by the present inventors with reference to FIGS. The details of the study for
FIG. 1 is a graph for explaining Planck's radiation law. FIG. 2 is a graph showing the relationship between the electromagnetic wave in the microwave to millimeter wave band and the temperature. FIG. 3 is an explanatory view for explaining the reception intensity of the electromagnetic wave. FIG.4 and FIG.5 is explanatory drawing for demonstrating the examination result regarding the temperature measurement using electromagnetic waves of a microwave-a millimeter-wave band.

  It is known that an object emits an electromagnetic wave having a wavelength and an intensity depending on its temperature. Therefore, by utilizing the electromagnetic wave emitted from the object, it is possible to measure the temperature of the object of interest. The measurement principle in such a radiation temperature measurement technique is based on Planck's radiation law, and it was shown that the radiation amount of the electromagnetic wave from the black body depends on the temperature and the wavelength as shown in the following Equation 1 A theoretical formula exists.

Here, in the above equation 1,
B _v : Spectral radiance of perfect radiator [W · sr ⁻¹ · m ⁻³ ]
h: Planck's constant [J · s]
:: frequency [Hz]
c: Speed of light [m / s]
k: Boltzmann constant [J / K]
T: Temperature [K]
It is.

FIG. 1 is a graph showing the values of the spectral radiance B _v when the temperature T is changed from 100 ° C. to 1000 ° C. As is clear from FIG. 1, since strong radiation exists in the visible to near infrared light band (wavelength range of about 1 μm to 10 μm), the conventional radiation temperature measurement technique uses visible light to near infrared light band. The temperature of the light is measured using

In the microwave band corresponding to the hatched area in FIG. 1, there is only about 10 ^-10 of spectral radiance compared to the infrared light band. In addition, Planck's radiation equation shown in Equation 1 is that an approximate equation (Rayleigh-Jeans equation) such as the following Equation 2 holds in a long wavelength band such as a microwave to millimeter wave band. In such a wavelength band, as shown in FIG. 2, radiation occurs in which the magnitude of the spectral radiance increases in proportion to the temperature. Here, in the following equation 2, λ represents the wavelength [m] of the electromagnetic wave having the frequency [[Hz].

Such electromagnetic waves in the microwave and millimeter wave bands are measured by detection with an antenna as shown in FIG. Assuming that the reception area of the antenna is A _e , the solid angle is Ω _A, and the spectral radiance from the black body radiation source is B _v , the intensity S of the electromagnetic wave in the microwave to millimeter waves received by the antenna is as follows It is represented like Formula 3.

As apparent from the above Equation 3, the intensity of the signal to be detected is sensitive to the change of the emissivity of the electromagnetic wave (that is, the spectral radiance B _v ) belonging to the microwave to millimeter wave band, and the spectral radiance is Even a slight change results in a large change in the observed signal strength.

  The inventor of the present invention has studied to measure the surface temperature in various situations of various steel materials using the technology disclosed in the above-mentioned Patent Document 2 using electromagnetic waves belonging to the microwave to millimeter wave bands. The Then, when measuring a track to be subjected to a mist cooling process for cooling a target material by injecting a cooling medium such as water in a fine mist state, a track manufactured on the same production line In spite of that, it was found for the first time that the measurement result is superimposed with an error that is too large to be considered as a measurement error.

  Therefore, in order to identify the cause of such an error, the present inventor switched the process of cooling the rail from mist cooling, which can not be used by a radiation thermometer, to air cooling, which can be used by a radiation thermometer, The correlation between the temperature measurement result given by the thermometer and the output of the radiation wave detector (ie, the signal value (V) indicating the intensity of the corresponding electromagnetic wave) for detecting the electromagnetic wave belonging to the microwave and millimeter wave bands was verified. .

  As a result, as schematically shown in FIG. 4, it was noticed that the detected intensity of the electromagnetic wave at the start of the measurement had a variation even with the rails manufactured on the same production line. Here, as schematically shown in FIG. 4, in each of the measurement results of the rail, there is a correlation such that the temperature measurement result given by the radiation thermometer and the detection intensity of the electromagnetic wave have a linear relationship. It existed. Therefore, the cause is not necessarily the measurement method using the electromagnetic wave belonging to the microwave and millimeter wave bands disclosed in Patent Document 2 itself. On the other hand, when comparing the correlation obtained by measuring the track 1 with the correlation obtained by measuring the track 2 manufactured on the same production line as the track 1, the slope of the straight line It turned out that a difference was seen.

From such findings, the inventor has estimated what is shown in FIG. 5 as a cause of the error being superimposed on the measurement result of the trajectory during mist cooling.
That is, after heating the steel material which consists of a predetermined steel type to predetermined temperature with a heating furnace, a rail is shape | molded into the shape of a rail through a multistep rolling process, and is provided to the forced cooling process using mist cooling. At this time, in the actual production line, it is considered that slight variation occurs in the growth rate of the scale on the surface of the steel material due to the influence of the steel type and slight variation such as rolling temperature at each stage. As a result, immediately before the forced cooling step, the thickness of the scale existing on the steel surface, the composition of the scale, and the generation state of the scale such as the surface roughness of the scale are respectively different, and the apparent radiation of the steel surface It is considered that the rate σ changes.

  Here, as mentioned earlier, the measurement method using an electromagnetic wave belonging to the microwave and millimeter wave bands is a measurement method that is extremely sensitive to changes in the emissivity σ of the object to be measured. As a result, it was estimated that an error was superimposed on the measurement result of the track due to a slight fluctuation of the apparent emissivity σ of the steel surface due to the generation state of the scale.

  Further, the superposition of measurement errors due to the above causes is not limited to the rails, and is considered to occur in the same manner even in the case of mist cooling of a rolled steel manufactured by hot rolling other than the rails.

  Based on such findings, the inventor has concluded that it is necessary to correct the change in emissivity σ accompanying the change in scale production state.

  Here, once the rolled steel is subjected to mist cooling, the surface temperature of the rolled steel immediately passes through the temperature range where the scale grows due to the fast cooling rate resulting from the mist cooling process, so mist cooling is in progress. The emissivity of the steel surface of can be regarded as almost constant. Therefore, if the emissivity σ of the rolled steel immediately before the mist cooling process can be appropriately corrected according to the generation state of the scale, the surface temperature of the rolled steel during mist cooling is in the microwave to millimeter wave band. It is considered possible to measure using the electromagnetic wave to which it belongs.

  As a result of conducting further studies based on the findings as described above, the inventor conceived of a steel material temperature measuring apparatus and a steel material temperature measuring method according to an embodiment of the present invention as described in detail below. .

First Embodiment
<About the composition of the steel material temperature measuring device>
Subsequently, the configuration of the steel material temperature measuring device according to the first embodiment of the present invention will be described in detail with reference to FIG. FIG. 6 is an explanatory view showing the configuration of the steel material temperature measuring device according to the present embodiment.

  The steel material temperature measurement device 10 according to the present embodiment is a device that measures the surface temperature of the rolled steel material during mist cooling in the cooling process of performing mist cooling on the hot-rolled rolled steel material. Here, the rolled steel material that has been hot-rolled is not particularly limited as long as it is used for mist cooling, and for example, forced cooling by mist cooling through a heating process of steel materials and multistage rolling processes A variety of known rolled steels can be mentioned, such as rails to which the process is applied.

  Rolled steel products such as rails do not stabilize the condition of the scale formed on the steel surface by passing through the heating process and multistage rolling process, and the emissivity of the steel surface fluctuates depending on the steel material. When subjected to mist cooling, the emissivity of the steel surface can be regarded as substantially constant because the rapid cooling rate resulting from the mist cooling process instantaneously passes through the temperature region where the scale grows. Therefore, the surface temperature of the rolled steel material during mist cooling can be accurately measured by performing processing as described below using an electromagnetic wave belonging to the microwave to millimeter wave bands.

  As illustrated in FIG. 6, the steel material temperature measuring device 10 according to the present embodiment mainly includes a radiation thermometer 100, an electromagnetic wave intensity measuring device 200, and an arithmetic processing unit 300.

  The radiation thermometer 100 is a device that measures the surface temperature of the rolled steel immediately before being subjected to mist cooling by detecting an electromagnetic wave that belongs to the infrared band. Since the radiation thermometer 100 is affected by the mist, it can not be used to measure the temperature of the rolled steel during mist cooling. However, in the steel material temperature measuring device 10 according to the present embodiment, the surface of the rolled steel just before being subjected to mist cooling in order to correct the fluctuation of the emissivity σ of the rolled steel caused by the difference in the generation state of the scale. The temperature is used.

  The radiation thermometer 100 can be installed at any position immediately before the mist cooling process, as long as the surface temperature of the rolled steel immediately before being subjected to mist cooling can be measured. Further, the optical installation condition of the radiation thermometer 100 is not particularly limited, either, so that the measurement range of the radiation thermometer 100 and the measurement range of the electromagnetic wave intensity measuring device 200 described later almost coincide with each other. It is preferable to be installed.

  The radiation thermometer 100 measures the surface temperature of the rolled steel immediately before being subjected to the mist cooling, and outputs measurement data on the obtained surface temperature to the arithmetic processing unit 300 described later.

  In addition, the kind of radiation thermometer 100 used with the steel material temperature measuring apparatus 10 which concerns on this embodiment is not specifically limited, It is possible to utilize a well-known radiation thermometer suitably.

  The electromagnetic wave intensity measuring device 200 detects the electromagnetic wave in the microwave to millimeter wave band among the radiation waves radiated from the rolled steel material, and is radiated from the rolled steel material immediately before being subjected to mist cooling and during mist cooling. Is an apparatus for measuring the intensity of an electromagnetic wave belonging to the microwave to millimeter wave band. The electromagnetic wave intensity measuring apparatus 200 has an antenna for receiving an electromagnetic wave in the microwave to millimeter wave band radiated from a rolled steel material, and an apparatus group for performing various processes on an output signal from the antenna. . The method of detecting the electromagnetic wave in the microwave to millimeter wave band may be appropriately selected according to the wavelength or frequency of the electromagnetic wave of interest, for example, a direct detection method, a heterodyne method or the like is used. It is possible. The electromagnetic wave intensity measuring device 200 uses the signal indicating the detection result of the electromagnetic wave in the microwave to millimeter wave band included in the radiation wave emitted from the rolled steel material as the intensity of the electromagnetic wave of interest, the arithmetic processing device 300 described later. Output to

  Here, it is preferable that the electromagnetic wave intensity measuring device 200 according to the present embodiment detects an electromagnetic wave having a frequency of 1 GHz to 200 GHz as the radiated electromagnetic wave in the microwave to millimeter wave bands. When detecting an electromagnetic wave whose frequency is less than 1 GHz, the antenna size included in the electromagnetic wave intensity measuring device 200 becomes a large device having a size of 1 m or more, and the measurement region of the electromagnetic wave intensity measuring device 200 also becomes large. It will be difficult to install in the process. In addition, the electromagnetic wave having a frequency of more than 200 GHz is not preferable because the effects of scattering by dust or water droplets having a particle size of several hundred μm become large, and the cost of parts constituting the electromagnetic wave intensity measuring device 200 also increases. . Therefore, by setting the upper limit value of the frequency of the electromagnetic wave of interest to about 200 GHz, it is possible to set the measurement area and the antenna size to an appropriate size without impairing the permeability of the electromagnetic wave. The frequency of the electromagnetic wave detected by the electromagnetic wave intensity measuring apparatus 200 is more preferably 10 GHz to 100 GHz.

  A specific example of the electromagnetic wave intensity measuring device 200 according to the present embodiment will be described in detail again below.

  Here, although the radiation thermometer 100 and the electromagnetic wave intensity measuring device 200 measure the surface temperature of the rolled steel immediately before being subjected to mist cooling and the intensity of the electromagnetic wave, the influence of the measurement error of each measuring device For the purpose of reduction, an average value at an appropriate elapsed time immediately before mist cooling may be used as each measurement value immediately before being subjected to mist cooling.

  Here, the temperature drop of the rolled steel before mist cooling is about 0.2 ° C. in 20 seconds, and the measurement error due to finding the average temperature over time is not a problematic level. At this time, if the averaging time is too long, the operation cycle is extended and the productivity is reduced. In addition, if the exposure time at high temperature is too long for the averaging process, the measurement is affected due to the influence of the emissivity change due to the scale growth on the surface. Therefore, it is preferable to set the time for averaging (that is, the above-mentioned elapsed time) to be a short time, specifically, to be 5 seconds or less.

  Arithmetic processing device 300 calculates the surface temperature of the rolled steel during mist cooling using the intensity of the electromagnetic wave belonging to the measured microwave to millimeter wave band. Under the present circumstances, the arithmetic processing unit 300 which concerns on this embodiment utilizes the surface temperature of the rolling steel material just before being provided to mist cooling for the fluctuation | variation of emissivity (sigma) of the rolling steel material resulting from the production condition of a scale differing. To correct. As a result, even with rolled steel materials having different scale generation conditions, the surface temperature of the rolled steel material during mist cooling can be measured more accurately using electromagnetic waves in a band belonging to microwave to millimeter waves. It becomes.

  Here, the specific configuration of the arithmetic processing unit 300 according to the present embodiment will be described again in detail below.

  Although the electromagnetic wave intensity measuring device 200 and the arithmetic processing device 300 are described as being implemented as different devices in the description of FIG. 6, the electromagnetic wave intensity measuring device 200 and the arithmetic processing device 300 are integrally formed. It may be done. That is, the electromagnetic wave intensity measuring device 200 may have a function realized by the arithmetic processing device 300, and the arithmetic processing device 300 may be equipped with a device for detecting an electromagnetic wave in a band belonging to microwaves to millimeter waves. Good.

  Further, the radiation thermometer 100 and the arithmetic processing unit 300, and the electromagnetic wave intensity measuring unit 200 and the arithmetic processing unit 300 may be directly connected to each other using a predetermined cable or the like, and various types such as the Internet and a local network It may be connected by wired communication or wireless communication via a network.

[About the configuration of the electromagnetic wave intensity measuring device]
Subsequently, a specific example of the electromagnetic wave intensity measuring device 200 according to the present embodiment will be described with reference to FIGS. 7A and 7B. FIG. 7A is an explanatory view showing the configuration of the electromagnetic wave intensity measuring device 200 using the direct detection method, and FIG. 7B is an explanatory view showing the configuration of the electromagnetic wave intensity measuring device 200 using the heterodyne method.

First, an exemplary configuration of an electromagnetic wave intensity measuring apparatus 200 using a direct detection method will be described with reference to FIG. 7A.
The electromagnetic wave intensity measuring apparatus 200 according to the direct detection method includes an antenna 201, an isolator 203, an SPDT switch 205, a reference temperature source 207, a variable attenuator 209, a driver 211, an RF amplifier 213, a filter 215, a detector 217, an amplifier 219 and a lock-in. The amplifier 221 is mainly provided.

  The antenna 201 receives an electromagnetic wave in a microwave to millimeter wave band among radiation waves radiated from a rolled steel material which is an object to be measured. The antenna 201 is installed on the rolled steel so as to be able to receive an electromagnetic wave of interest, and preferably faces the rolled steel which is the object to be measured, and has substantially the same measurement range as the radiation thermometer 100 described above. It will be installed to be The antenna 201 may be designed according to the measurement area of the rolled steel and the frequency of the electromagnetic wave to be detected, and a horn type or a Cassegrain type can be used. The electromagnetic wave in the microwave to millimeter wave band detected by the antenna 201 is output to the isolator 203.

  The isolator 203 is an element that outputs a signal related to an electromagnetic wave detected by the antenna 201 to the SPDT switch 205 described later, while preventing a reflected wave generated in the electromagnetic wave intensity measuring device 200 from being output to the antenna 201. is there. By providing the isolator 203 between the antenna 201 and the SPDT switch 205, it is possible to prevent the noise of the reflected wave from being superimposed on the antenna 201.

  A single pole double throw (SPDT) switch 205 is a type of switching element, and a received signal received by the antenna 201 and a noise signal output from the reference temperature source 207 via the variable attenuator 209. Is input. The SPDT switch 205 is controlled by the driver 211, which will be described later, which of the reception signal and the noise signal is output to the outside.

  The reference temperature source 207 outputs a noise signal as a reference of thermal noise, and the noise signal as a temperature reference output from the reference temperature source 207 is output to the variable attenuator 209. The variable attenuator 209 adjusts the noise signal output from the reference temperature source 207 to the same level as the received signal, and outputs the adjusted signal to the SPDT switch 205.

  The driver 211 is a device that switches the signal output from the SPDT switch 205. The driver 211 outputs a reception signal received by the antenna 201 to an RF amplifier 213 described later, and outputs a noise signal output from the variable attenuator 209 as a reference signal (Ref) to a lock-in amplifier 221 described later. . The switching frequency of the SPDT switch 205 may be appropriately set according to the frequency of the electromagnetic wave in the microwave to millimeter wave band of interest, but can be set to, for example, about 40 Hz.

  The RF amplifier (high frequency amplifier) 213 amplifies the reception signal output from the SPDT switch 205. The received signal amplified by the RF amplifier 213 is output to the filter 215.

  The filter 215 is a device that transmits the reception signal of a specific frequency range among the reception signals output from the RF amplifier 213. The received signal filtered by the filter 215 is output to the detector 217.

  The detector 217 converts the signal of the specific frequency range output from the filter 215 into a voltage signal, and outputs the voltage signal to the amplifier 219. The amplifier 219 amplifies the voltage signal output from the detector 217 and outputs the amplified voltage signal to the lock-in amplifier 221.

  The lock-in amplifier 221 detects the difference between the voltage signal output from the amplifier 219 and the reference signal output from the driver 211, and detects the signal corresponding to this difference as the detection result of the electromagnetic wave in the microwave to millimeter wave band. Is outputted to the arithmetic processing unit 300 as a signal indicating.

  The devices described above cooperate and function to detect the electromagnetic wave in the microwave to millimeter wave band among the radiation waves radiated from the rolled steel material which is the object to be measured, and output it to the arithmetic processing unit 300 It will be done.

  In addition, it is preferable to use the electromagnetic wave intensity measuring apparatus 200 which utilized the direct detection system as shown to FIG. 7A, when the frequency of the electromagnetic waves to which its attention is paid is less than 40 GHz. When the frequency of the electromagnetic wave of interest is 40 GHz or more, it is preferable to use the electromagnetic wave intensity measurement apparatus 200 using the heterodyne system described below.

-Electromagnetic wave intensity measuring device using heterodyne system Next, an example of composition of electromagnetic wave intensity measuring device 200 using a heterodyne system is explained, referring to Drawing 7B.
The heterodyne electromagnetic wave intensity measuring apparatus 200 includes an antenna 201, an isolator 203, an SPDT switch 205, a reference temperature source 207, a variable attenuator 209, a driver 211, a detector 217, an amplifier 219, a lock-in amplifier 221, an oscillator 251, and variable attenuation. Mainly comprises a mixer 253, a mixer 255, a filter 257 and an IF amplifier 259.

  Here, the antenna 201, the isolator 203, the reference temperature source 207, the variable attenuator 209, the driver 211, the amplifier 219, and the lock-in amplifier 221 have the same functions as the devices in the electromagnetic wave intensity measuring apparatus 200 by the direct detection method. Since the same effect is exhibited, the detailed description is omitted.

  Also, the SPDT switch 205 has the same function as the SPDT switch 205 of the electromagnetic wave intensity measuring device 200 by the direct detection method except that the received signal received by the antenna 201 is output to the mixer 255 described later. The detailed description is omitted.

  The oscillator 251 is a device that oscillates a local signal for down-converting the reception signal output from the SPDT switch 205. The frequency of the local signal may be appropriately set in accordance with the frequency band of the electromagnetic wave of interest. The local signal output from the oscillator 251 is input to the mixer 255 after being adjusted by the variable attenuator 253 as necessary.

  The mixer 255 down-converts the received signal by mixing the received signal output from the SPDT switch 205 with the local signal output from the oscillator 251 and outputs the down-converted signal to the filter 257.

  The filter 257 is a device that transmits a signal corresponding to the frequency band of the electromagnetic wave of interest among the signals output from the mixer 255. The signal filtered by the filter 257 is output to the IF amplifier 259.

  An IF amplifier (intermediate frequency amplifier) 259 amplifies a signal corresponding to the difference frequency between the received signal and the local signal among the signals output from the filter 257. The amplified signal is output to the detector 217.

  The detector 217 has the same function as the detector 217 of the electromagnetic wave intensity measuring apparatus 200 by the direct detection method except that it converts the signal output from the IF amplifier 259 into a voltage signal, and exhibits the same effect. Therefore, detailed description is omitted.

  A case will be considered in which an electromagnetic wave having a frequency of 90 GHz to 98 GHz is detected using the heterodyne electromagnetic wave intensity measuring apparatus 200 as described above. In such a case, the band of frequencies transmitted by the filter 257 can be set to 90 GHz to 98 GHz. In addition, since the intermediate frequency IF is 2 GHz to 10 GHz by setting the local frequency at which the oscillator 251 oscillates to 100 GHz, an IF amplifier 259 having a band of about 2 GHz to 10 GHz may be used.

  The devices described above cooperate and function to detect the electromagnetic wave in the microwave to millimeter wave band among the radiation waves radiated from the rolled steel material which is the object to be measured, and output it to the arithmetic processing unit 300 It will be done.

  The specific example of the electromagnetic wave intensity measuring device 200 according to the present embodiment has been described above with reference to FIGS. 7A and 7B.

[About the configuration of the processing unit]
Subsequently, the configuration of the arithmetic processing unit 300 according to the present embodiment will be described with reference to FIG. FIG. 8 is a block diagram showing an example of the configuration of an arithmetic processing unit 300 according to the present embodiment.

  As shown in FIG. 8, the arithmetic processing unit 300 according to this embodiment includes a data acquisition unit 301, a surface temperature calculation unit 303, a calculated temperature output unit 305, a display control unit 307, and a storage unit 309. Mainly to

  The data acquisition unit 301 is realized by, for example, a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), a communication device, and the like. The data acquisition unit 301 is measurement data of the surface temperature of the rolled steel immediately before being subjected to mist cooling, which is output from the radiation thermometer 100, and immediately before being subjected to mist cooling, which is output from the electromagnetic wave intensity measuring device 200. And the data (for example, the data etc. which show the reception voltage of the said electromagnetic waves etc.) which showed the detection result of the radiation electromagnetic waves of the microwave-millimeter wave band about the rolling steel materials in mist cooling are each acquired. Thereafter, the data acquisition unit 301 outputs the acquired measurement data to the surface temperature calculation unit 303 described later.

  In addition, the data acquisition unit 301 may associate the acquired various measurement data with time information such as the date and time when the measurement data is acquired, and may record the result as history information in the storage unit 309 described later.

  The surface temperature calculation unit 303 is realized by, for example, a CPU, a ROM, a RAM, and the like. The surface temperature calculation unit 303 measures the intensity of the electromagnetic wave of the rolled steel material immediately before being subjected to mist cooling, the surface temperature of the rolled steel material by the radiation thermometer 100, and the electromagnetic wave intensity measurement device 200 measured by the electromagnetic wave intensity measurement device 200. The surface temperature of the rolled steel during mist cooling is calculated using the strength of the electromagnetic wave of the rolled steel during mist cooling, which is measured by the above.

  As described above, the hot-rolled rolled steel material is subjected to mist cooling immediately before being subjected to mist cooling because the state of the scale formed on the surface of the rolled steel material differs between the rolled steel materials in the manufacturing process. The emissivity of the rolled steels differs from one rolled steel to another. On the other hand, during mist cooling, it is considered that no scale is newly generated on the steel surface due to the fast cooling rate of mist cooling, so that the emissivity of the rolled steel during mist cooling can be regarded as constant. Conceivable. Therefore, if the emissivity of the rolled steel material immediately before being subjected to mist cooling can be appropriately corrected for each rolled steel material, the electromagnetic wave belonging to the microwave to millimeter wave band can be used to It is possible to measure the surface temperature.

  Therefore, in the surface temperature calculation unit 303 according to the present embodiment, first, the intensity of the electromagnetic wave measured by the electromagnetic wave intensity measuring device 200 and the surface temperature of the rolled steel material by the radiation thermometer 100 immediately before being subjected to mist cooling , To calculate the correction coefficient for correcting the emissivity of the rolled steel immediately before being subjected to mist cooling. In other words, the correction coefficient functions as a correction coefficient for setting the initial value of the measurement during the mist cooling by the electromagnetic wave intensity measuring apparatus 200 to a substantially constant value between the rolled steel materials.

Specifically, the surface temperature calculation unit 303 sets the intensity of the electromagnetic wave of the rolled steel material immediately before being subjected to mist cooling to S ₀ , which is measured by the electromagnetic wave intensity measuring device 200, and the surface of the rolled steel material by the radiation thermometer 100. Assuming that the temperature is T ₀ , the correction coefficient A is calculated based on the following equation 101. The correction coefficient A is a value that varies for each rolled steel material subjected to mist cooling, and is maintained while the surface temperature of the rolled steel material subjected to mist cooling is measured.

After that, the surface temperature calculation unit 303 uses the correction coefficient A that is calculated when the electromagnetic wave intensity of the rolled steel material during mist cooling is S _c , which is measured by the electromagnetic wave intensity measurement device 200, and the following equation Based on 103, the surface temperature T _c of the rolled steel during mist cooling is calculated. The surface temperature T _c obtained in this way is a corrected surface temperature (true surface temperature) from which measurement errors due to fluctuations in emissivity have been removed.

The surface temperature calculation unit 303 does not calculate the correction coefficient A, and the electromagnetic wave intensity S ₀ of the rolled steel material immediately before being subjected to mist cooling and the radiation thermometer 100 measured by the electromagnetic wave intensity measurement device 200. The surface temperature T ₀ of the rolled steel according to the above may be held during measurement, and the surface temperature T _c may be calculated based on the following equation 105.

However, when the correction coefficient A is calculated, the subsequent surface temperature T _c may be calculated only once while the multiplication may be performed only once, whereas when the correction coefficient A is not calculated, the subsequent surface temperature is calculated. When calculating T _c , one multiplication and one division must be performed. Therefore, in order to further speed up the temperature measurement process, it is preferable to calculate the surface temperature _Tc by Equation 103 after calculating the correction coefficient A.

When the surface temperature _Tc during mist cooling is calculated for the rolled steel material of interest, the surface temperature calculation unit 303 outputs data indicating the calculation result to a calculation temperature output unit 305 described later. In addition, the surface temperature calculation unit 303 may store data indicating the calculation result in the storage unit 309 as history information in association with time information on the date and time and the like when the data is generated.

  The calculated temperature output unit 305 is realized by, for example, a CPU, a ROM, a RAM, a communication device, and the like. The calculated temperature output unit 305 outputs data indicating the surface temperature of the rolled steel material calculated by the surface temperature calculation unit 303 to, for example, a display control unit 307 described later. In addition, the calculated temperature output unit 305 calculates the rolling of the external device such as the cooling process control device 20 or the like that controls the cooling process using mist cooling, for example, via various networks such as the Internet and a local area network. You may output the data which showed the surface temperature of steel materials. The calculated temperature output unit 305 may output the calculated surface temperature of the rolled steel as a printed matter using a printer or the like.

  In addition, the calculated temperature output unit 305 associates data representing the calculated surface temperature of the rolled steel material during mist cooling with time information on the date and time when the data is calculated, and records it in the storage unit 309 described later as history information. You may

  The display control unit 307 is realized by, for example, a CPU, a ROM, a RAM, an output device, and the like. The display control unit 307 outputs the calculation result of the surface temperature of the rolled steel material output from the calculated temperature output unit 305 to an output device such as a display provided in the arithmetic processing device 300 or an output device provided outside the arithmetic processing device 300 Perform display control when displaying on. Thereby, the user of the steel material temperature measuring apparatus 10 can grasp the measurement result regarding the surface temperature of the rolled steel material during the mist cooling on the spot.

  The storage unit 309 is realized by, for example, a RAM, a storage device, or the like included in the arithmetic processing unit 300 according to the present embodiment. In the storage unit 309, various parameters that need to be stored when the arithmetic processing unit 300 performs some processing, progress of processing, etc., various databases, programs, etc. are appropriately recorded. In the storage unit 309, the data acquisition unit 301, the surface temperature calculation unit 303, the calculated temperature output unit 305, the display control unit 307, and the like can freely perform data read / write processing.

  Heretofore, an example of the function of the arithmetic processing unit 300 according to the present embodiment has been shown. Each component described above may be configured using a general-purpose member or circuit, or may be configured by hardware specialized for the function of each component. Further, all functions of each component may be performed by a CPU or the like. Therefore, it is possible to change the configuration to be used as appropriate according to the technical level at which the present embodiment is implemented.

  In addition, it is possible to create a computer program for realizing each function of the arithmetic processing unit according to the present embodiment as described above, and to install it on a personal computer or the like. In addition, a computer readable recording medium in which such a computer program is stored can be provided. The recording medium is, for example, a magnetic disk, an optical disk, a magneto-optical disk, a flash memory or the like. In addition, the above computer program may be distributed via, for example, a network without using a recording medium.

<About the steel material temperature measurement method>
Next, an example of the flow of the steel material temperature measuring method according to the present embodiment will be briefly described with reference to FIG. FIG. 9 is a flow chart showing an example of the flow of the steel material temperature measuring method according to the present embodiment.

  In the steel material temperature measuring method according to the present embodiment, the rolled steel material immediately before mist cooling is measured using both the radiation thermometer 100 and the electromagnetic wave intensity measuring apparatus 200 for the hot rolled steel material subjected to mist cooling. (Step S101). Under the present circumstances, it is preferable that the installation position is adjusted beforehand so that the radiation thermometer 100 and the electromagnetic wave intensity measuring apparatus 200 may measure about the substantially same area | region of rolled steel materials.

  Next, an electromagnetic wave emitted from the surface of the rolled steel under mist cooling is measured using the electromagnetic wave intensity measuring device 200 (step S103).

Thereafter, the arithmetic processing unit 300 measures the measured value of the radiation thermometer 100 immediately before mist cooling, the measured value of the electromagnetic wave intensity measuring device 200 immediately before mist cooling, and the measured value of the electromagnetic wave intensity measuring device 200 during mist cooling. The surface temperature of the rolled steel during mist cooling is calculated as needed (step 105). Specifically, the surface temperature calculation unit 303 of the arithmetic processing unit 300 sets the intensity of the electromagnetic wave of the rolled steel immediately before being subjected to mist cooling to S _0, and the intensity of the electromagnetic wave of the rolled steel during mist cooling to S _c. When the surface temperature of the rolled steel material by the radiation thermometer 100 is T ₀ , the surface temperature T _c of the rolled steel material during mist cooling is calculated.

  This makes it possible to more accurately measure the surface temperature of the steel during mist cooling, even when the state of the scale generated on the surface of the material changes.

(About hardware configuration)
Next, the hardware configuration of the arithmetic processing unit 300 according to the embodiment of the present invention will be described in detail with reference to FIG. FIG. 10 is a block diagram for explaining the hardware configuration of the arithmetic processing unit 300 according to the embodiment of the present invention.

  The arithmetic processing unit 300 mainly includes a CPU 901, a ROM 903 and a RAM 905. The arithmetic processing unit 300 further includes a bus 907, an input unit 909, an output unit 911, a storage unit 913, a drive 915, a connection port 917, and a communication unit 919.

  The CPU 901 functions as an arithmetic processing unit and a control unit, and controls all or part of the operation in the arithmetic processing unit 300 in accordance with various programs recorded in the ROM 903, the RAM 905, the storage unit 913, or the removable recording medium 921. The ROM 903 stores programs used by the CPU 901, calculation parameters, and the like. The RAM 905 primarily stores programs used by the CPU 901, parameters that appropriately change in the execution of the programs, and the like. These are mutually connected by a bus 907 constituted by an internal bus such as a CPU bus.

  The bus 907 is connected to an external bus such as a peripheral component interconnect / interface (PCI) bus via a bridge.

  The input device 909 is an operation unit operated by the user, such as a mouse, a keyboard, a touch panel, a button, a switch, and a lever. Further, the input device 909 may be, for example, a remote control unit (so-called remote control) using infrared rays or other radio waves, or an external connection device 923 such as a PDA corresponding to the operation of the processing unit 300. May be Furthermore, the input device 909 is configured of, for example, an input control circuit that generates an input signal based on the information input by the user using the above-described operation means, and outputs the generated input signal to the CPU 901. By operating the input device 909, the user can input various data to the arithmetic processing unit 300 and instruct processing operations.

  The output device 911 is configured of a device capable of visually or aurally notifying the user of the acquired information. Such devices include display devices such as CRT display devices, liquid crystal display devices, plasma display devices, EL display devices and lamps, audio output devices such as speakers and headphones, printer devices, mobile phones, facsimiles and the like. The output device 911 outputs, for example, results obtained by various processes performed by the arithmetic processing unit 300. Specifically, the display device displays the results obtained by the various types of processing performed by the arithmetic processing unit 300 as text or an image. On the other hand, the audio output device converts an audio signal composed of reproduced audio data, acoustic data and the like into an analog signal and outputs it.

  The storage device 913 is a device for data storage configured as an example of a storage unit of the arithmetic processing unit 300. The storage device 913 includes, for example, a magnetic storage unit device such as a hard disk drive (HDD), a semiconductor storage device, an optical storage device, or a magneto-optical storage device. The storage device 913 stores programs executed by the CPU 901, various data, various data acquired from the outside, and the like.

  The drive 915 is a reader / writer for a recording medium, and is built in or externally attached to the arithmetic processing unit 300. The drive 915 reads out information recorded in a removable recording medium 921 such as a mounted magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory, and outputs the information to the RAM 905. The drive 915 can also write a record on a removable recording medium 921 such as a mounted magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory. The removable recording medium 921 is, for example, a CD medium, a DVD medium, a Blu-ray (registered trademark) medium, or the like. Further, the removable recording medium 921 may be Compact Flash (registered trademark) (Compact Flash: CF), a flash memory, an SD memory card (Secure Digital memory card), or the like. Further, the removable recording medium 921 may be, for example, an IC card (Integrated Circuit card) equipped with a noncontact IC chip, an electronic device, or the like.

  The connection port 917 is a port for directly connecting a device to the arithmetic processing unit 300. Examples of the connection port 917 include a universal serial bus (USB) port, an IEEE 1394 port, a small computer system interface (SCSI) port, and an RS-232C port. By connecting the external connection device 923 to the connection port 917, the arithmetic processing unit 300 acquires various data directly from the external connection device 923 or provides various data to the external connection device 923.

  The communication device 919 is, for example, a communication interface configured of a communication device or the like for connecting to the communication network 925. The communication device 919 is, for example, a communication card for wired or wireless Local Area Network (LAN), Bluetooth (registered trademark), or WUSB (Wireless USB). In addition, the communication device 919 may be a router for optical communication, a router for asymmetric digital subscriber line (ADSL), a modem for various types of communication, or the like. The communication device 919 can transmit and receive signals and the like according to a predetermined protocol such as TCP / IP, for example, with the Internet or another communication device. The communication network 925 connected to the communication device 919 is configured by a network or the like connected by wire or wireless, and is, for example, the Internet, a home LAN, an in-house LAN, infrared communication, radio wave communication or satellite communication. May be

  Heretofore, an example of the hardware configuration that can realize the functions of the arithmetic processing unit 300 according to the embodiment of the present invention has been shown. Each of the components described above may be configured using a general-purpose member, or may be configured by hardware specialized for the function of each component. Therefore, it is possible to change the hardware configuration to be used as appropriate according to the technical level of the time of carrying out the present embodiment.

  Then, the steel-materials temperature measuring device and steel-materials temperature measuring method which concern on this invention are concretely demonstrated, showing an Example. The examples shown below are merely examples of the steel material temperature measuring apparatus and the steel material temperature measuring method according to the present invention, and the steel material temperature measuring apparatus and the steel material temperature measuring method according to the present invention are limited to the following examples. It is not a thing.

  In the example described below, 11 rails (HH370 rail) based on the JIS E1120-2007 standard manufactured on the same manufacturing line were used as the measurement object. Then, the radiation thermometer 100 and the antenna 201 of the electromagnetic wave intensity measuring apparatus 200 are installed in parallel in the cooling line of the rail as schematically shown in FIG. 11, and the temperature measurement in the cooling process is performed. Carried out. At this time, the measurement positions of both measurement devices were adjusted so that the center of the field of view of the antenna 201 and the field of view of the radiation thermometer 100 were substantially matched.

  The separation distance between the radiation thermometer 100 and the antenna 201 and the measurement portion of the track is set to 100 mm, and the electromagnetic wave intensity measuring apparatus 200 uses the direct detection method shown in FIG. 7A. , And detect electromagnetic waves having a frequency of 35 GHz.

  Here, in the present embodiment, in order to compare with the measurement value by the radiation thermometer 100, the cooling of the rail is not mist cooling but air cooling by air blowing, and measurement by the radiation thermometer is possible even during cooling. I did it.

  The relationship between the measured temperature of the radiation thermometer and the electromagnetic wave intensity when the correction processing of the emissivity σ as described above is not performed on the measurement data of 11 obtained rails is shown in FIG. It was shown to. As is clear from FIG. 12, in each of the measurement data for 11 lines, the linear relationship expected from the Rayleigh-Jeans equation holds between the measurement temperature of the radiation thermometer and the electromagnetic wave intensity. Recognize. However, the electromagnetic wave intensities of the tracks are different from each other, and it is understood that the inclinations of the straight lines are also slightly different from each other. In such a state, it is difficult to measure an accurate surface temperature using electromagnetic waves in the microwave and millimeter wave bands unless some correction processing is performed.

  Subsequently, the relationship between the measurement temperature of the radiation thermometer and the electromagnetic wave intensity in the case where the correction processing of the emissivity σ as described above is performed on the obtained measurement data of 11 rails is shown in FIG. It showed to 13. In this example, the correction coefficient A represented by the above-mentioned equation 101 is calculated for each of the measurement data of 11 tracks, and the processing of multiplying each measurement data by the calculated correction coefficient A is performed. As apparent from FIG. 13, it can be seen that the measurement data of 11 tracks overlap so as to substantially coincide. The measurement error of the measurement data for 11 tracks in this case was approximately ± 10 ° C. or less.

  The measurement results as described above are the measurement results of the cooling process by air cooling, not by mist cooling, but the linear relationship as shown in FIG. 13 is satisfied in air cooling where the cooling rate is slower than mist cooling In view of the above, it can be said that measurement of the surface temperature of the rail during mist cooling is possible within the range where the measurement error is ± 10 ° C. or less even in mist cooling where the cooling rate is faster.

  Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to such examples. It is obvious that those skilled in the art to which the present invention belongs can conceive of various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also fall within the technical scope of the present invention.

Reference Signs List 10 steel temperature measuring apparatus 100 radiation thermometer 200 electromagnetic wave intensity measuring apparatus 201 antenna 203 isolator 205 SPDT switch 207 reference temperature source 209, 253 variable attenuator 211 driver 213 RF amplifier 215, 257 filter 217 detector 219 amplifier 221 lock-in amplifier 251 Oscillator 255 mixer 259 IF amplifier 300 arithmetic processing unit 301 data acquisition unit 303 surface temperature calculation unit 305 calculated temperature output unit 307 display control unit 309 storage unit

Claims (8)

A steel temperature measuring device for measuring a surface temperature of the rolled steel during mist cooling in a cooling process of performing mist cooling on a hot rolled rolled steel,
A radiation thermometer for measuring the surface temperature of the rolled steel immediately before being subjected to mist cooling;
An electromagnetic wave intensity measuring device for measuring the intensity of an electromagnetic wave belonging to a microwave to millimeter wave band emitted from the rolled steel material immediately before being subjected to mist cooling and during mist cooling.
An arithmetic processing unit that calculates the surface temperature of the rolled steel material during mist cooling using the intensity of the electromagnetic wave belonging to the measured microwave to millimeter wave band;
Equipped with
The arithmetic processing unit
Measured by the electromagnetic wave intensity measuring device, the electromagnetic wave intensity of the rolled steel material immediately before being subjected to mist cooling measured by the electromagnetic wave intensity measuring device, the surface temperature of the rolled steel material by the radiation thermometer, and A steel temperature measuring device, comprising: a surface temperature calculation unit configured to calculate a surface temperature of the rolled steel during mist cooling using the strength of electromagnetic waves of the rolled steel during mist cooling. The surface temperature calculation unit sets the intensity of the electromagnetic wave of the rolled steel immediately before being subjected to mist cooling to S _0, and the intensity of the electromagnetic wave of the rolled steel during mist cooling to S _c, and the rolling by the radiation thermometer the surface temperature of the steel material is taken as _{T 0,} the surface temperature _{T c} of the rolled steel in mist cooling _is calculated by _{T c = S c × (T} 0 / S 0) refers to the arithmetic processing, to claim 1 Steel material temperature measuring device as described. The surface temperature calculation unit
When the intensity of the electromagnetic wave of the rolled steel just before being subjected to mist cooling is S ₀ and the surface temperature of the rolled steel by the radiation thermometer is T ₀ , A = (T ₀ / S ₀ ) Calculate the correction factor A
The surface temperature T _c of the rolled steel material during mist cooling is calculated by arithmetic processing of T _c = A × S _c , where S _c is the intensity of the electromagnetic wave of the rolled steel material during mist cooling. The steel temperature measuring device described in.   The electromagnetic wave intensity measuring device detects an electromagnetic wave having a frequency of 1 GHz to 200 GHz as the electromagnetic wave belonging to the microwave to millimeter wave band, and measures the intensity of the electromagnetic wave having a frequency of 1 GHz to 200 GHz. The steel material temperature measuring device according to any one of 3.   The steel material temperature measurement device according to any one of claims 1 to 4, wherein the radiation thermometer and the electromagnetic wave intensity measurement device are arranged such that the measurement ranges of the rolled steel material substantially coincide with each other.   The steel material temperature measuring device according to any one of claims 1 to 5, wherein the electromagnetic wave intensity measuring device is an electromagnetic wave detecting device using a direct detection method or a heterodyne method.   The steel material temperature measuring device according to any one of claims 1 to 6, wherein the rolled steel material is a rail. A steel temperature measuring method for measuring the surface temperature of the rolled steel during mist cooling in a cooling process of mist cooling a hot rolled rolled steel,
An electromagnetic wave intensity measuring device for measuring the surface temperature of the rolled steel material immediately before being subjected to mist cooling, the intensity of an electromagnetic wave belonging to the microwave to millimeter wave band radiated from the rolled steel material, and a radiation thermometer Measure
The intensity of the electromagnetic wave belonging to the microwave to millimeter wave band radiated from the rolled steel material during mist cooling is measured by the electromagnetic wave intensity measuring device,
Measured by the electromagnetic wave intensity measuring device, the electromagnetic wave intensity of the rolled steel material immediately before being subjected to mist cooling measured by the electromagnetic wave intensity measuring device, the surface temperature of the rolled steel material by the radiation thermometer, and The steel-materials temperature measuring method which calculates the surface temperature of the said rolled steel materials in mist cooling using the intensity | strength of electromagnetic waves of the said rolled steel materials in mist cooling.

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