JP5421840B2 - Temperature control method for reference plate in metal plate temperature measuring device - Google Patents

Description

  The present invention relates to a method for controlling the temperature of a reference plate in a temperature measuring device for a metal plate that is used in, for example, a continuous annealing facility or an alloyed hot dip galvanizing facility and measures the temperature of the metal plate in a non-contact manner.

  In continuous annealing equipment for continuously heat-treating steel sheets and galvannealed equipment for galvanizing after hot-dip plating, various types of steel sheets are continuously processed. For this reason, in order to stabilize the mechanical properties (strength, elongation, etc.) and plating properties (degree of alloying, etc.) of steel plates that differ for each product type, the steel plate temperature after the heat treatment process with heating / cooling is set to the target temperature. It is important to control accurately.

  The temperature measurement of a steel sheet continuously conveyed in these facilities is generally performed using a non-contact radiation thermometer (see, for example, Patent Document 1). When using a radiation thermometer, it is necessary to set the emissivity of the steel sheet that is the object to be measured. However, since the emissivity of a steel sheet varies depending on various factors such as the steel sheet itself, the physical properties of the steel sheet, such as the surface properties, and the temperature of the steel sheet, it is very difficult to set the emissivity of the steel sheet in response to such variations. Have difficulty. As a result, an error is likely to occur in the measurement of the steel plate temperature, and the steel plate temperature cannot be accurately controlled to the target temperature.

  Therefore, as a measurement method that eliminates the influence of the emissivity fluctuation of the steel plate as much as possible, the number of times of alternately reflecting between the reference plate and the steel plate is radiated toward the steel plate at an angle of 1 or 2 each. A measuring method based on the knowledge that the apparent emissivity is increased by installing a thermometer has been proposed.

For example, as shown in FIG. 6 (a), the furnace wall 110a, 110b, 110c, surrounded by a furnace at 110d, the measured steel plate of a reference plate 120 to the width _{W s} of the width _{W r} equipped with a temperature controller 160 It is installed opposite to 130. The target temperature T _{0 of the} steel plate 130 to be measured is input to the temperature controller 160, and a heater that is uniformly arranged over the entire surface in the width W _r direction of the reference plate 120 from the power source 150 in accordance with an instruction from the temperature controller 160. Power is supplied to 140. Further, the temperature T ₂ of the reference plate 120 is directly measured by the contact thermometer 170. Furthermore, the radiation thermometer 180 is installed toward the steel plate 130 to be measured at an angle θ at which the radiant energy is alternately reflected once or twice between the reference plate 120 and the steel plate 130 to be measured. In this way, the emissivity emitted from the steel plate 130 to be measured is measured by the radiation thermometer 180, and the temperature obtained by converting to the temperature of a black body that emits energy equivalent to this emissivity is the emissivity temperature T. _g . Controls the heater 140 at the temperature controller 160 to temperature _{T 2} of the reference plate 120 approaches the temperature _{T 1} of the target temperature _{T 0} or the measured steel plate 130 of a measured steel plate 130, and reference id temperature _{T g} This is a steel plate temperature measurement method in which the steel plate temperature calculator 190 calculates the temperature T _{1 of the} steel plate 130 to be measured based on the temperature T _{2 of the} plate 120 (see, for example, Patent Document 2).

JP-A-3-67137 Japanese Patent No. 4217255

However, as shown in FIG. 6 (a), in the air transport zone where no burner or the like is installed, there is heat radiation from the furnace wall side surfaces 110c and 110d that do not face the steel plate 130 to be measured, and from the steel plate 130 to be measured. The form factor is also small. Therefore, the furnace wall side surfaces 110c and 110d have a small amount of heat reception and have a lower temperature than the furnace wall upper surface 110a facing the steel plate 130 to be measured. Thus, the reference width W if the reference plate 120 _r installed to face the measured steel plate 130 having a width W _s, the reference plate 120 width W _r direction of the heater 140 is uniformly arranged over the entire surface of the By merely heating the plate 120, the temperature at both ends of the reference plate 120 in the width _Wr direction inevitably decreases. In such a state, when the width W _s of the steel plate 130 to be measured changes, the ratio of the reference plate 120 other than the steel plate 130 to be measured (furnace wall upper surface 110a) also changes, and the width W _{r of the} reference plate 120 changes. The temperature distribution in the direction also changes (see FIG. 6B). In this way, when the width W _{s of the} steel plate 130 to be measured changes, the temperature of the portion in the width W _r direction of the reference plate 120 corresponding to the portion where the width W _{s of the} steel plate 130 to be measured has changed is inevitably increased. change will be (temperature deviation increases), and the error of calculating the temperature T ₁ of the measured steel plate 130 (i.e., the temperature measurement error of the measured steel plate 130) has a problem that increases.

  The object of the present invention is to reduce the temperature change (temperature deviation) of the portion in the width direction of the reference plate corresponding to the portion where the width of the metal plate to be measured changes even when the width of the metal plate to be measured changes. Another object of the present invention is to provide a temperature control method for a reference plate in a metal plate temperature measuring apparatus capable of reducing a temperature measurement error of a metal plate to be measured.

In order to achieve this object, the invention according to claim 1 of the present invention provides:
See the plate width W is installed to face the measured metal plate which varies from a minimum width Wmin to a maximum width Wmax width W _r, and the auxiliary heater main heater provided along the reference plate, the main A main temperature control device and an auxiliary temperature control device for controlling the heater and the auxiliary heater, a temperature detector for directly measuring the temperature of the reference plate (hereinafter referred to as “reference plate temperature”) T ₂ , The radiant energy radiated from each of the measurement metal plate and the reference plate is installed toward the metal plate to be measured so that the radiant energy is reflected a predetermined number of times between the reference plate and the metal plate to be measured. the energy emitted from the measured metal plate at this angle is measured and the radiation for outputting is converted into an equivalent temperature T _r corresponding to the temperature of a black body that emits the measured energy equivalent energy With a degree meter, and a metal plate temperature correction calculation circuit for calculating the temperature T ₁ of the device under test metal sheet on the basis of the equivalent temperature T _r and the reference plate temperature T ₂ to the width W of the measured metal plate The temperature control method for the reference plate in the metal plate temperature measuring device, wherein the width of the main heater is set to correspond to the width W _{r of the} reference plate,
The auxiliary heater is provided along the reference plate so as to correspond to positions outside the both ends of the metal plate to be measured having a minimum width Wmin facing the reference plate,
Wherein even when the width W of the measured metal plate is changed, for the reference plate temperature T ₂ is as close to the temperature T ₁ of the target temperature T ₀ or the measured metal plate of the measured metal plate,
While supplying predetermined power to the main heater based on an instruction of the main temperature control device,
Based on an instruction from the auxiliary temperature control device, a predetermined power corresponding to the width W of the metal plate to be measured is supplied to the auxiliary heater, and the temperature distribution of the reference plate is controlled to be a predetermined temperature distribution. It is the temperature control method of the reference board in the temperature measuring apparatus of the metal plate characterized.

The invention according to claim 2 is the invention according to claim 1,
The auxiliary heaters are outside the both end portions of the metal plate to be measured having a minimum width Wmin facing the reference plate along the reference plate, and both end portions of the metal plate to be measured having a maximum width Wmax. It is characterized by being provided so as to correspond to the inner positions.

The invention according to claim 3 is the invention according to claim 2,
The temperature of the portion of the main heater corresponding to the position outside the both end portions of the metal plate to be measured having the maximum width Wmax facing the main heater is the temperature of the metal plate to be measured having the maximum width Wmax facing the main heater. It is characterized in that the temperature is higher than the temperature of the main heater corresponding to the position inside the both ends.

The invention according to claim 4 is the invention according to claim 1,
The auxiliary heater is provided along the reference plate so as to correspond to a position on the outer side from a position spaced outward by α from both ends of the metal plate to be measured having a minimum width Wmin facing the reference plate. It is characterized by that.

The invention according to claim 5 is the invention according to claim 1,
The temperature of the auxiliary heater is configured such that the outer side is higher than the inner side with respect to the width W _r direction of the reference plate.

According to the present invention, the width of the main heater is set to correspond to the width W _{r of the} reference plate,
The auxiliary heater is provided along the reference plate so as to correspond to positions outside the both ends of the metal plate to be measured having a minimum width Wmin facing the reference plate,
Wherein even when the width W of the measured metal plate is changed, for the reference plate temperature T ₂ is as close to the temperature T ₁ of the target temperature T ₀ or the measured metal plate of the measured metal plate,
While supplying predetermined power to the main heater based on an instruction of the main temperature control device,
Based on an instruction from the auxiliary temperature control device, a predetermined power corresponding to the width W of the metal plate to be measured is supplied to the auxiliary heater, and the temperature distribution of the reference plate is controlled to be a predetermined temperature distribution. For,
Even when the width of the metal plate to be measured changes, the change in temperature (temperature deviation) of the width direction portion of the reference plate corresponding to the portion where the width of the metal plate to be measured has changed is reduced. The temperature measurement error can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS It is for demonstrating schematic structure of the temperature measuring apparatus of the steel plate which concerns on Embodiment 1, (a) is a sheet | seat direction cross section and a control flow figure, (b) Explanation for demonstrating heater temperature and a reference board temperature. FIG. It is for demonstrating schematic structure of the temperature measuring apparatus of the steel plate which concerns on Embodiment 2, (a) is a sheet-passing direction cross section and a control flow figure, (b) Explanation for demonstrating heater temperature and a reference board temperature. FIG. It is for demonstrating schematic structure of the temperature measuring apparatus of the steel plate which concerns on Embodiment 3, (a) is a sheet | seat direction cross section and a control flow figure, (b) Explanation for demonstrating heater temperature and a reference board temperature. FIG. It is explanatory drawing for demonstrating the influence which the auxiliary heater installation position in Embodiment 3 has on the temperature of a reference plate. It is for demonstrating schematic structure of the temperature measuring apparatus of the steel plate which concerns on Embodiment 4, (a) is a sheet-pass direction cross section and a control flow figure, (b) Explanation for demonstrating heater temperature and reference plate temperature. FIG. It is for demonstrating schematic structure of the conventional temperature measuring apparatus of a steel plate, (a) is a sheet direction cross section and a control flowchart, (b) It is explanatory drawing for demonstrating reference plate temperature.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

Embodiment 1
1A and 1B are diagrams for explaining a schematic configuration of a temperature measuring apparatus for a steel sheet according to Embodiment 1, wherein FIG. 1A is a cross-sectional view and a control flow diagram, and FIG. 1B is a heater temperature and a reference plate temperature. It is explanatory drawing for doing.

1 in (a), 1a, 1b, 1c, 1d are furnace wall, 2 reference plate width _{W r,} 3 a steel sheet as an object to be measured metal plate width varies from a minimum width Wsmin up width WSMAX, 4 Is incorporated in the reference plate 2 and has a main heater whose width corresponds to the width W _r of the reference plate 2, 5 is a main power source, 6 is a temperature controller as a main temperature control device, and 7 is a reference plate 2. thermocouple as a temperature detector for measuring the temperature T ₂ directly, the angle of the number 8 for reflecting radiant energy alternately between (spacing h) of the reference plate 2 and the steel plate 3 becomes once or twice in each A radiation thermometer installed toward the steel plate 3 so as to be θ, 10 is a steel plate temperature correction arithmetic circuit as a metal plate temperature correction arithmetic circuit, 11 is an auxiliary power source, 12 is a temperature controller as an auxiliary temperature control device, 13 Is a supplement provided along the reference plate 2 A heater. Both the steel plate 3 having the minimum width Wsmin and the steel plate 3 having the maximum width Wsmax are opposed to the reference plate 2 and the distance between them is h. However, the positions are shifted from each other for convenience of illustration. Incidentally, a thermocouple 7 for measuring the temperature of the reference plate 2, a plurality placed on reference plate 2, it is desirable that the reference plate temperature T ₂ by averaging the measured values of the thermocouples 7. In this embodiment, in order to explain a steel plate as an example of the metal plate to be measured, in the description of the minimum width Wmin and the maximum width Wmax, “s” for indicating steel is used as a subscript. Has been granted.

Furnace wall 1a, 1b, 1c, surrounded by a furnace at 1d, placed to face the steel plate 3 of the reference plate 2 having a width _{W r} having a temperature controller 6 width varies from a minimum width Wsmin up width Wsmax It is.

  The auxiliary heaters 13 are located outside the both ends of the steel plate 3 with the minimum width Wsmin facing the reference plate 2 along the reference plate 2 and at positions inside the both ends of the steel plate 3 with the maximum width Wsmax. It is provided to correspond.

The target temperature T ₀ of the steel plate 3 is input to the temperature controller 6, and the main heater 4 disposed uniformly over the entire surface in the width W _r direction of the reference plate 2 from the main power source 5 in accordance with an instruction from the temperature controller 6. Is supplied with power. Furthermore, it is configured to supply predetermined power corresponding to the width Ws of the steel plate 3 from the auxiliary power source 11 to the auxiliary heater 13 in accordance with an instruction from the temperature controller 12.

Further, the id released from the steel plate 3 is measured by a radiation thermometer 8, a temperature obtained by converting the temperature of a black body that emits the id equivalent energy and Id temperature T _g.

Then, even if the width Ws of the steel plate 3 is changed, for the reference plate temperature T ₂ is as close to the temperature T ₁ of the target temperature T ₀ or below to the steel plate 3 of the steel plate 3 _(see FIG. 1) A predetermined power is supplied to the main heater 4 based on an instruction from the temperature controller 6, and a predetermined power corresponding to the width Ws (minimum width Wsmin to maximum width Wsmax) of the steel plate 3 is supplied to the auxiliary heater based on an instruction from the temperature controller 12. 13 and is controlled so that the temperature distribution of the reference plate 2 becomes a predetermined temperature distribution.

More specifically, for example, when the minimum width Wsmin = 600 mm, the maximum width Wsmax = 1200 mm, W _r = 2000 mm, the target temperature T ₀ of the steel plate 3 = 800 ° C., and the auxiliary heater 13 is installed at the position described above, The combined temperature of the main heater 4 and the auxiliary heater 13 is shown as Invention Example 1 (only the left half side is displayed because it is symmetrical) on the left half side of FIG. 1B according to the width Ws of the steel plate 3. 1B, the detailed temperature of the reference plate 2 in the case of the steel plate 3 of Wsmax as shown as Invention Example 1 (only the left half side is displayed because it is symmetrical) on the left half side of FIG. And Wsmin steel plate 3, the temperature deviation when compared at each position of the detailed temperature of the reference plate 2 is compared with the conventional example shown in the right half side of FIG. 1B (same as FIG. 6). (Ie, reference plate 2 The temperature distribution is controlled to be a predetermined temperature distribution).

Thus, even when the width Ws of the steel plate 3 is changed, the temperature of the portion in the width W _r direction of the reference plate 2 corresponding to the portion {(Wsmax−Wsmin) / 2} where the width Ws of the steel plate 3 is changed. since the changes (temperature deviation) is reduced, based on the width Ws of the id temperature T _g and the reference plate temperature T ₂ and the steel plate 3, the following expressions steel temperature correction operation circuit 10. by (1), the steel plate 3 so that the temperature measurement error of the temperature T ₁ of 3 can be reduced.

T ₁ ≈ F [T _g + K (T ₂ −T _g )] (1)

Here, F is a form factor that varies depending on the geometric relationship between the steel plate 3 and the reference plate 2, but is corrected so as to approach 1 based on the width Ws of the steel plate 3. K is a correction coefficient composed of a function of only the emissivities ε ₁ and ε ₂ of the steel plate 3 and the reference plate 2. Therefore, the correction coefficient K itself is will be affected by emissivity variations of the steel plate 3 and the reference plate 2, the temperature of the reference plate 2 so as to approach the id temperature T _g (i.e., the reference plate 2 Since the temperature is controlled so as to approach the target temperature T _{0 of} the steel plate 3 or the temperature T ₁ of the steel plate 3 described above, an error due to the correction coefficient K is excluded, and the steel plate temperature can be measured with high accuracy.

[Embodiment 2]
2A and 2B are diagrams for explaining a schematic configuration of a temperature measuring apparatus for a steel sheet according to Embodiment 2, wherein FIG. 2A is a cross-sectional view and a control flow diagram, and FIG. 2B is a diagram illustrating heater temperature and reference plate temperature. It is explanatory drawing for doing. In FIG. 2, the same components as those in FIG. 1 are given the same reference numerals and detailed description thereof is omitted, and only different portions will be described in detail.

In FIG. 2A, reference numeral 24 denotes a main heater built in the reference plate 2 and having a width set to correspond to the width W _r of the reference plate 2. The temperature of the portion of the main heater 24 corresponding to the position outside the both ends of the steel plate 3 having the maximum width Wsmax facing the main heater 24 is located at the inside of the both ends of the steel plate 3 having the maximum width Wsmax facing the main heater 24. The coils of the both ends of the main heater 24 are densely arranged so that the temperature is higher than the temperature of the main heater 24 corresponding to.

  More specifically, for example, when the auxiliary heater 13 is installed at the same position as in FIG. 1A, the combined temperature of the main heater 24 and the auxiliary heater 13 is changed according to the width Ws of the steel plate 3 as shown in FIG. When control is performed as shown as Invention Example 2 (only the left half side is displayed because it is bilaterally symmetrical) on the left half side, Invention Example 2 (left side because it is bilaterally symmetrical) is similarly displayed on the left half side of FIG. The temperature deviation when comparing the position of the detailed temperature of the reference plate 2 in the case of the Wsmax steel plate 3 and the detailed temperature of the reference plate 2 in the case of the Wsmin steel plate 3 as shown in FIG. As compared with the conventional example shown in the right half of FIG. 2B (same as FIG. 1B), the temperature distribution of the reference plate 2 is controlled to be a predetermined temperature distribution. ).

Therefore, as in the case of the first embodiment, when the width Ws of the steel plate 3 is changed, the width W of the reference plate 2 corresponding to the portion {(Wsmax−Wsmin) / 2} where the width Ws of the steel plate 3 is changed. since the temperature change of _r direction of a portion (temperature deviation) is reduced, based on the width Ws of the id temperature T _g and the reference plate temperature T ₂ and the steel plate 3, the steel plate temperature correction operation circuit 10. According to the equation (1), the temperature measurement error of the temperature T ₁ of the steel plate 3 can be calculated to be small.

[Embodiment 3]
FIG. 3 is a diagram for explaining a schematic configuration of a temperature measuring apparatus for a steel sheet according to Embodiment 3, wherein (a) illustrates a cross section in a plate passing direction and a control flow diagram, and (b) illustrates a heater temperature and a reference plate temperature. It is explanatory drawing for doing. In FIG. 3, the same components as those in FIG. 1 are given the same reference numerals and detailed description thereof is omitted, and only different portions will be described in detail.

In FIG. 3 (a), reference numeral 23 denotes a position on the outer side of the reference plate 2 that is further away from the both ends of the steel plate 3 having the minimum width Wsmin facing the reference plate 2 by α (outside of the reference plate 2). It is an auxiliary heater provided so as to correspond to both ends in the width _Wr direction.

  The combined temperature of the main heater 4 and the auxiliary heater 23 is shown as Invention Example 3 (only the left half side is displayed because it is symmetrical) on the left half side of FIG. 3B according to the width Ws of the steel plate 3. In this way, the details of the reference plate 2 in the case of the steel plate 3 of Wsmax as shown as Invention Example 3 (only the left half side is displayed because it is bilaterally symmetric) on the left half side of FIG. The temperature deviation when comparing the temperature and the detail temperature of the reference plate 2 in the case of the steel plate 3 of Wsmin is the conventional example shown in the right half side of FIG. 3B (same as FIG. 1B). (That is, the temperature distribution of the reference plate 2 is controlled to be a predetermined temperature distribution).

Therefore, similarly to the first and second embodiments, when the width Ws of the steel plate 3 changes, the reference plate 2 corresponding to the portion {(Wsmax−Wsmin) / 2} where the width Ws of the steel plate 3 changes. since the temperature change of the width W _r direction of a portion (temperature deviation) is reduced, the id based on the temperature T _g and the width Ws of the reference plate temperature T ₂ and the steel plate 3, the steel sheet temperature correction calculation circuit 10 From the above equation (1), the temperature measurement error of the temperature T ₁ of the steel plate 3 can be calculated to be small.

  Moreover, in this embodiment, the result of having considered the installation position of the auxiliary heater 23 and the influence which the position has on the temperature of the reference plate 2 is FIG. In FIG. 4, the horizontal axis is C = (α / (distance h between the steel plate 3 and the reference plate 2)), and the vertical axis is the temperature influence (ratio) on the reference plate 2. The temperature influence on the reference plate 2 on the vertical axis is a ratio based on the temperature of the reference plate 2 when α = 0. From FIG. 4, the surface of the reference plate 2 immediately below the end of the steel plate 3 is affected by the steel plate 3, so the auxiliary heater 23 can be installed from a position a distance α away from the end of the steel plate 3 of Wsmin. It is. Further, if the auxiliary heater 23 is installed too far from the end of the Wsmin steel plate 3, a temperature drop portion is generated in the reference plate 2, but C is 4 or less (that is, α is 4 times that of h). For example, the temperature of the reference plate 2 falls within a change of 0.01 (that is, 1%) or less with respect to the standard. Therefore, it is preferable to install the auxiliary heater 23 at a position α where C is 4 or less.

[Embodiment 4]
5A and 5B are diagrams for explaining a schematic configuration of a temperature measuring apparatus for a steel sheet according to Embodiment 4, wherein FIG. 5A is a cross-sectional view and a control flow diagram, and FIG. 5B is a heater temperature and a reference plate temperature. It is explanatory drawing for doing. In FIG. 5, the same components as those in FIG. 1 are given the same numbers and detailed description thereof is omitted, and only different portions will be described in detail.

In FIG. 5A, reference numeral 33 denotes an auxiliary heater provided along the reference plate 2 so as to correspond to positions outside the both ends of the steel plate 3 having the minimum width Wsmin facing the reference plate 2. The temperature of the auxiliary heater 33 is densely configured with coils at both ends of the auxiliary heater 33 so that the outer side is higher than the inner side with respect to the width W _r direction of the reference plate 2.

  The combined temperature of the main heater 4 and the auxiliary heater 33 is shown as Invention Example 4 (only the left half side is displayed because it is symmetrical) on the left half side of FIG. 5B according to the width Ws of the steel plate 3. In this way, the details of the reference plate 2 in the case of the steel plate 3 of Wsmax as shown as Invention Example 4 (only the left half side is displayed because it is bilaterally symmetric) on the left half side of FIG. The temperature deviation when comparing the temperature and the detailed temperature of the reference plate 2 in the case of the steel plate 3 of Wsmin is the conventional example shown in the right half side of FIG. 5B (same as FIG. 1B). (That is, the temperature distribution of the reference plate 2 is controlled to be a predetermined temperature distribution).

Therefore, as in the first, second, and third embodiments, when the width Ws of the steel plate 3 changes, the reference plate corresponding to the portion {(Wsmax−Wsmin) / 2} in which the width Ws of the steel plate 3 changes. since the temperature change of the second width W _r direction of a portion (temperature deviation) is reduced, based on the width Ws of the id temperature T _g and the reference plate temperature T ₂ and the steel plate 3, the steel sheet temperature correction operation circuit 10, the temperature measurement error of the temperature T ₁ of the steel plate 3 can be calculated by the above formula (1) so as to be small.

  In the first to fourth embodiments, the steel plate is described as the metal plate to be measured. However, the invention is not limited to this, and the metal plate can be widely applied.

In the first to fourth embodiments, is measured energy emitted from the measured metal plate, Ido temperature as an equivalent temperature T _r corresponding to the temperature of a black body that emits the measured energy equivalent energy Although _Tg has been described as an example, the present invention is not limited to this, and it is also possible to use an equivalent temperature corresponding to the temperature of a black body that emits energy equivalent to multiple reflection energy.

1a, 1b, 1c, 1d: furnace wall 2: reference plate 3: steel plate 4, 24: main heater 5: main power source 6, 12: temperature controller 7: thermocouple 8: radiation thermometer 10: steel plate temperature correction calculation circuit 11 : Auxiliary power supply 13, 23, 33: Auxiliary heater

Claims (5)

See the plate width W is installed to face the measured metal plate which varies from a minimum width Wmin to a maximum width Wmax width W _r, and the auxiliary heater main heater provided along the reference plate, the main A main temperature control device and an auxiliary temperature control device for controlling the heater and the auxiliary heater, a temperature detector for directly measuring the temperature of the reference plate (hereinafter referred to as “reference plate temperature”) T ₂ , The radiant energy radiated from each of the measurement metal plate and the reference plate is installed toward the metal plate to be measured so that the radiant energy is reflected a predetermined number of times between the reference plate and the metal plate to be measured. the energy emitted from the measured metal plate at this angle is measured and the radiation for outputting is converted into an equivalent temperature T _r corresponding to the temperature of a black body that emits the measured energy equivalent energy With a degree meter, and a metal plate temperature correction calculation circuit for calculating the temperature T ₁ of the device under test metal sheet on the basis of the equivalent temperature T _r and the reference plate temperature T ₂ to the width W of the measured metal plate The temperature control method for the reference plate in the metal plate temperature measuring device, wherein the width of the main heater is set to correspond to the width W _{r of the} reference plate,
The auxiliary heater is provided along the reference plate so as to correspond to positions outside the both ends of the metal plate to be measured having a minimum width Wmin facing the reference plate,
Wherein even when the width W of the measured metal plate is changed, for the reference plate temperature T ₂ is as close to the temperature T ₁ of the target temperature T ₀ or the measured metal plate of the measured metal plate,
While supplying predetermined power to the main heater based on an instruction of the main temperature control device,
Based on an instruction from the auxiliary temperature control device, a predetermined power corresponding to the width W of the metal plate to be measured is supplied to the auxiliary heater, and the temperature distribution of the reference plate is controlled to be a predetermined temperature distribution. A reference plate temperature control method in a metal plate temperature measuring apparatus.   The auxiliary heaters are outside the both end portions of the metal plate to be measured having a minimum width Wmin facing the reference plate along the reference plate, and both end portions of the metal plate to be measured having a maximum width Wmax. The temperature control method for the reference plate in the metal plate temperature measuring device according to claim 1, wherein the temperature control device is provided so as to correspond to the inner positions.   The temperature of the portion of the main heater corresponding to the position outside the both end portions of the metal plate to be measured having the maximum width Wmax facing the main heater is the temperature of the metal plate to be measured having the maximum width Wmax facing the main heater. 3. The temperature control method for a reference plate in a metal plate temperature measuring device according to claim 2, wherein the temperature is higher than the temperature of the portion of the main heater corresponding to the position inside the both end portions.   The auxiliary heater is provided along the reference plate so as to correspond to a position on the outer side from a position spaced outward by α from both ends of the metal plate to be measured having a minimum width Wmin facing the reference plate. The temperature control method of the reference plate in the metal plate temperature measuring device according to claim 1, wherein 2. The temperature measurement of the metal plate according to claim 1, wherein the temperature of the auxiliary heater is configured such that the outer side is higher than the inner side with respect to the width W _r direction of the reference plate. A reference plate temperature control method in the apparatus.

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