JPH07110219A - Instrument for measuring diameter of hot material - Google Patents

Abstract

PURPOSE:To prevent an instrument for measuring the diameter of a hot material from being affected by the radiant heat of the hot material and improve the maintainability of the instrument. CONSTITUTION:A CCD camera 32 for measuring dimension is arranged at a prescribed distance from bar steel 10. A first stopping mechanism 36 which adjusts the light quantity inputted to the camera 32 is provided between the camera 32 and bar steel 10. The light emitted from the steel 10 caught by means of the camera 32 is converted into electric signals and a diameter calculating means 34 calculates the diameter of the steel 10 based on the electric signals. A CCD camera 52 for measuring deviation is positioned at a position which is about 90 deg. deviated from the camera 32 with respect to the running path of the steel 10. The center of the camera 52 is aligned with the running center of the steel 10 and detects the horizontal deviation of the camera 52. In addition, a second stopping mechanism 60 which adjusts the light quantity inputted to the camera 52 is provided between the steel 10 and camera 52.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring a diameter of a high temperature material, and more specifically, for measuring the diameter of a long material in a high temperature state after rolling, using light emitted from the material itself. The present invention relates to such a diameter measuring device.

[0002]

2. Description of the Related Art For example, when rolling a strip, it is measured whether or not the rolled strip fits within a required diameter tolerance, and the amount of reduction in a rolling mill is adjusted based on the measurement result. The diameter measurement is performed during running in a hot state immediately after rolling. As a device for measuring the diameter of the traveling rod, a device having a configuration shown in FIG. 8 has been put into practical use. This device is a bar strip 1 to be measured.
Two light sources 14 and 16 composed of halogen lamps for irradiating light rays toward the rod 10 are arranged on one side of the guide 12 that guides 0 in the vertical direction at regular intervals. On the other side of the guide 12, receiving light sources 18, 20 represented by CCD image sensors facing the lamp light sources 14, 16 with the bar 10 interposed are arranged. Diameter calculation means as a basis
The diameter of the bar 10 is calculated by (not shown). Between the lamp light sources 14 and 16 and the rod 10, lenses 22 and 24 for converting the diffused light into parallel rays and irradiating the rod 10 are provided, and the rod 10 and the light receiving source 18 are arranged. Lenses 26 and 28 for forming an image of the parallel rays are arranged between the lenses 26 and 28. Further, the separation distance L between the two parallel rays with which the rod 10 is irradiated is set to be shorter than the minimum diameter R of the rod 10 to be measured.

When measuring the diameter, the lamp light source 1
As shown in FIG. 8, the light from 4, 16 is intercepted by the bar 10 and then caught by the corresponding light receiving source 18, 20. The light receiving sources 18 and 20 convert the width of the received light into an electric signal according to the light shielding width of the bar 10.
Based on this signal, the diameter calculating means calculates the upper light-shielding width L ₁ and the lower light-shielding width L ₂ and adds the constant distance L (L + L ₁ + L ₂ ) to obtain the diameter of the rod 10. R is measured in real time.

[0004]

In the above-mentioned conventional diameter measuring device, since the two parallel rays are separated by the distance L and have a required width, the rod 10 to be measured by changing the order. When the diameter of changes,
If the amount of change is within the required range, the bar 10 can be measured without moving and adjusting the measuring device.
However, if the diameter of the rod 10 is such that it protrudes from the parallel rays from one of the lamp light sources 14 as shown by the chain double-dashed line in FIG. 8, the diameter of the rod 10 cannot be measured in this state. Therefore, in this case, as shown in FIG. 9, the diameter measuring device is moved upward to move the rod 10 between the two parallel rays.
Need to be adjusted. As described above, when the diameter dimension of the bar strip 10 to be measured changes significantly due to order change or the like, the measuring device must be moved and adjusted each time. However, in the current situation where high-mix, small-lot production is required as in recent years, it takes time to adjust the measuring device, which causes a problem that the cycle time required for order change becomes long and the manufacturing efficiency decreases. It was

The rod 10 to be measured is in a high temperature state.
Since the temperature is (about 800 ° C. to 1000 ° C.), the bar itself emits light, and in the above-mentioned measuring device, in order to distinguish between the self-emission of the bar 10 and the measuring light, the halogen of high luminous intensity as described above The light sources 14 and 16 composed of lamps were arranged close to the rod 10. Therefore, the light sources 14, 16 and the light receiving source 18,
20 had a problem that it failed due to the effect of radiant heat generated from the bar 10 or the durability was lowered. Further, a cutting device such as a shear that cuts the bar strip 10 to a predetermined size is arranged close to the measurement position of the bar strip 10, and the measurement device receives vibration from the cutting device, which makes accurate measurement impossible. However, it has drawbacks such as reduced mechanical life.

Further, since the measuring device is arranged close to the high temperature bar strip 10, it is difficult for an operator to approach the measuring device during the measuring work (during line operation), and maintenance of the device cannot be performed. . It is also pointed out that the lamp light sources 14 and 16 need to be replaced in a short period of time due to the use under the adverse conditions (high temperature / vibration) as described above, and the running cost increases. Moreover, the lamp light source 14,
The adjustment work when replacing 16 was complicated and time-consuming.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of various drawbacks inherent in the diameter measuring apparatus for a high temperature material according to the above-mentioned prior art, and has been proposed to suitably solve the drawbacks. Is not affected by the radiant heat of
Moreover, it is an object of the present invention to provide a diameter measuring device for a high temperature material which can improve maintainability.

[0008]

[Means for Solving the Problems]
In order to preferably achieve the intended purpose, the present invention is a device for measuring the diameter of a high temperature material traveling in a high temperature state, the device being arranged at a position intersecting the traveling direction of the high temperature material, and self-luminous of the material. And a first diaphragm unit which is disposed between the high-temperature material and the dimension measurement imaging unit and which adjusts the amount of light input to the dimension measurement imaging unit according to the temperature of the material. Disposed at a position intersecting the traveling direction of the high-temperature material, the displacement amount image pickup means for detecting self-luminous light of the material, and disposed between the high-temperature material and the displacement amount image pickup means, Second diaphragm means for adjusting the amount of light input to the deviation amount measuring imaging means according to the temperature of the material; and diameter calculating means for calculating the diameter of the high temperature material based on the detection data of the dimension measuring imaging means. And an image pickup means for measuring the displacement amount. Serial detects deviation amount of the position relative to the dimension measurement imaging means of hot material, characterized by being configured to electrically correct the data of the diameter of the high-temperature materials based on the deviation amount.

In order to preferably achieve the above object, another invention of the present application is an apparatus for measuring a diameter of a high temperature material traveling in a high temperature state, the apparatus being arranged at a position intersecting a traveling direction of the high temperature material. Arranged between the high-temperature material and the dimension measurement image pickup means for imaging the self-luminous light of the material by imaging with a lens, and the dimension measurement image pickup means depending on the temperature of the material. First to adjust the amount of light input
Between the diaphragm means and the image pickup means for measuring the displacement amount, which is arranged at a position intersecting the traveling direction of the high temperature material and detects the self-luminous light of the material, and between the high temperature material and the image pickup means for the displacement amount measurement. Second diaphragm means which is arranged and adjusts the amount of light input to the image pickup means for measuring deviation amount according to the temperature of the material, and a diameter for calculating the diameter of the high temperature material based on the detection data of the image pickup means for dimension measurement. A deviation amount of the position of the high temperature material with respect to the dimension measurement imaging unit is detected by the displacement amount imaging unit, and the lens is moved based on the displacement amount to measure the dimension. It is characterized in that the focus of the image pickup means is adjusted.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a high temperature material diameter measuring device according to the present invention will be described below with reference to the accompanying drawings, with reference to a preferred embodiment. As described above, the diameter measuring device provided with the lamp light source for diameter measurement has various problems as described above. Therefore, in the present invention, attention is paid to the fact that light is generated from the high temperature material itself, and the diameter of the material is measured by utilizing the self-luminous light. FIG. 1 is a schematic configuration diagram of a diameter measuring device according to a preferred embodiment of the present invention. The diameter measuring device according to this embodiment is used to measure the diameter of the rod 10 having the following specifications immediately after rolling. Bar strip diameter: 70 mm to 130 mm Bar strip temperature: 800 ° C. to 1000 ° C. Bar strip traveling speed: 1.1 to 3 m / sec

In FIG. 1, a lens 30 facing the rod 10 is provided at a position separated from the rod 10 guided by a guide (not shown) by a predetermined distance in a direction intersecting the traveling direction. CCD as image pickup means for dimension measurement
A camera 32 is arranged. The self-luminous light emitted from the rod 10 is formed into an image by the lens 30 and converted into an electric signal by the CCD camera 32.
(See Figure 3). Then, this electric signal is input to the diameter calculating means 34 in the personal computer 33, and the diameter of the bar 10 is calculated. Since it is not necessary to distinguish between the self-luminous light of the rod 10 and the measuring light, a CCD for measuring dimensions is used.
The camera 32 can be arranged at a position largely separated from the rod 10 and is not affected by radiant heat. Further, by setting the distance between the CCD camera 32 and the bar 10 to be long, the self-emission from the bar 10 can be regarded as parallel rays and processed.

Here, the temperature of the rolled bar 10 largely varies depending on its material, shape, diameter and the like. On the other hand, the range of the light receiving sensitivity in the CCD camera 32 for dimension measurement is about 160 ° C. when converted into the temperature of the bar 10 and when the temperature of the bar 10 is changed by changing the order. Does not allow accurate measurement under the same setting conditions. Therefore, even when the temperature of the rod 10 changes, a certain amount of light is always applied to the dimension measurement C.
The CCD camera 32 as if input to the CD camera 32.
The first diaphragm mechanism 36 is disposed between the rod 10 and the rod 10.
The first diaphragm mechanism 36 includes a pair of shield plates 38, 38 spaced apart from each other by a required distance, and a pulse motor 40 for adjusting an angle of the shield plates 38, 38.
By changing the angle with respect to 0, both shield plates 38,
The amount of light (transmission amount) that is input to the camera side via the slit 42 defined between 38 is adjusted. Shield plate 3
Nos. 8 and 38 are set so that the amount of light transmitted from the slit 42 is gradually reduced by changing from the posture intersecting with the emission direction of the self-luminous emission from the rod 10 to the posture along the emission direction. It In addition, the first throttle mechanism 36 is also a bar 1.
It is arranged at a position greatly apart from 0 (about 4000 mm) and is not affected by the radiant heat from the rod 10.

The pulse motor 40 is provided with an encoder 44 for detecting the amount of rotation of the motor 40, and the output of the encoder 44 is supplied to an angle input section 46 of the personal computer 33. .
The motor 40 is connected to the controller 48, and adjusts the posture of the shield plates 38, 38 according to a command from the controller 48 to adjust the amount of light transmission.
The posture control of the shield plates 38, 38 is performed by the dimension measurement C
It is set to be adjusted according to the temperature of the bar 10 detected by the CD camera 32. That is, the dimension measuring CCD camera 32 is provided with the slits 42 fully opened by setting the shield plates 38, 38 of the first diaphragm mechanism 36 in a posture intersecting with the emission direction of the self-luminous light in the rod 10. The temperature of the rod 10 is calculated from the level of the electric signal obtained by the input light quantity. And the strip 1
According to the temperature of 0, the slit 4 in the first diaphragm mechanism 36
The opening degree of 2 is adjusted. For example, when the bar 10 has a low temperature, as shown in FIG. 2, by increasing the opening of the slit 42 in the first diaphragm mechanism 36, the CC
When a large amount of light is input to the D camera 32 and conversely the temperature of the bar 10 is high, the opening amount of the slit 42 is reduced to reduce the amount of light input to the CCD camera 32 with respect to the entire self-emission. As a result, the dimension measuring CCD camera 32 having a constant light receiving sensitivity range can cope with a wide temperature change of the rod 10.

As shown in FIG. 1, a lens 50 facing the rod 10 is placed at a position deviated by about 90 ° about the traveling path of the rod 10 with respect to the position where the CCD camera 32 for dimension measurement is arranged. A CCD camera 52 as an image pickup unit for measuring the deviation amount is provided. This CCD camera 52
Similar to the dimension measuring CCD camera 32, the self-luminous light of the rod 10 input through the lens 50 is converted into an electric signal and output to the diameter calculating means 34. Further, the center of the displacement amount measuring CCD camera 52 is positioned so as to coincide with the running center C of the rod 10, and the amount by which the rod 10 is horizontally displaced from the running center C is detected. There is. That is, the dimension measuring CCD
Since the focus of the camera 32 is set to coincide with the running center C of the rod 10, the rod 10 is displaced in the horizontal direction.
If the distance from the CCD camera 32 is changed, the focal point is deviated and the diameter cannot be accurately measured. Therefore, as shown in FIG. 4 and FIG.
An accurate diameter is measured by detecting the horizontal deviation amount of the rod 10 by the camera 52 and electrically correcting the diameter data obtained by the dimension measurement CCD camera 32 based on the data. Is set.

Since the correction amount of the diameter data based on the horizontal deviation amount of the rod 10 differs depending on the thickness of the rod 10, the diameter of the rod 10 as shown in FIG. 6 (diagonal line) in advance. Data of the correction amount based on is stored and input to the personal computer 33. Then, an appropriate correction amount is set based on the temperature of the bar 10 obtained by the dimension measuring CCD camera 32 and the displacement amount obtained by the displacement amount measuring CCD camera 52. There is. Since there is almost no image blurring with respect to the vertical displacement of the bar 10 guided by the guide, it is not necessary to correct the detection data of the displacement measurement CCD camera 52.

A pair of shield plates 54, 5 are provided between the rod 10 and the CCD camera 52 for measuring the deviation amount, and are separated by a required distance.
4 and a pulse motor 56 for adjusting the angles of the shield plates 54, 54, and by defining the angle of the shield plates 54, 54 with respect to the bar 10 to define between the shield plates 54, 54. A second diaphragm mechanism 60 for adjusting the amount of light (transmission amount) input to the camera via the slit 58 is provided. In adjusting the opening of the slit 58 in the second diaphragm mechanism 60, the pulse motor 56 is drive-controlled by a command from the controller 48 in accordance with the temperature of the bar 10 detected by the dimension measuring CCD camera 32. Adjusted by The rotation angle of the pulse motor 56 is detected by the encoder 62 and input to the angle input unit 46. A CCD for measuring the amount of deviation
The camera 52 and the second diaphragm mechanism 60 are both the rod 10
Since it is arranged at a position greatly separated from the
From the second diaphragm mechanism 60 to about 3000m
m), the self-luminous light from the rod 10 can be treated as parallel rays and processed, and is not affected by radiant heat.

[0017]

Next, the operation of the diameter measuring device according to the embodiment will be described. When the diameter of the rod 10 is measured, first, the pulse motors 40 and 56 are driven to fully open the slits 42 and 58 of the diaphragm mechanisms 36 and 60. When the tip of the rod 10 traveling under the guidance of the guide reaches the measurement position, the self-luminous light from the rod 10 is input to the dimension measurement CCD camera 32 via the slit 42. The light caught by the camera 32 is converted into an electric signal as shown in FIG.
Is calculated. The pulse motor 40 of the first diaphragm mechanism 36 is drive-controlled by the controller 48 based on the obtained temperature of the bar strip 10, and the pair of shield plates 38, 3
8 rotates to change the opening degree of the slit 42. Then, when the light receiving sensitivity range of the dimension measuring CCD camera 32 reaches an appropriate temperature range, the pulse motor 40 is stopped and controlled, and the opening degree of the slit 42 is set to an appropriate value. Further, the pulse motor 56 of the second diaphragm mechanism 60 is similarly drive-controlled, and the opening degree of the slit 58 is set to an appropriate value. As a result, the amount of self-luminous light emitted from the rod 10 is input according to the ranges of the dimension measurement CCD camera 32 and the deviation amount measurement CCD camera 52.

The self-luminous light emitted from the rod 10 is adjusted to an appropriate amount through the slit 42, then imaged by the lens 30, and captured by the dimension measuring CCD camera 32. The light caught by the camera 32 is converted into an electric signal and detected as a graph as shown in FIG.
In this case, the self-luminous light from the bar 10 is captured by the camera 32 because the scattered light including parallel light is dimmed by the slit 42 and imaged on the lens 30.
Then, the diameter of the bar 10 is calculated by the diameter calculating means 34 based on this electric signal. The bar 1
When 0 passes through the measurement position and the tip of the next bar strip 10 arrives, the throttling mechanisms 36 and 60 are adjusted again, and the bar strip 1 is adjusted.
Accurate diameter measurements are always made as a function of zero temperature.

In the embodiment, after adjusting the diaphragm mechanisms 36, 60 by detecting the temperature at the tip of the bar 10, the diaphragm mechanisms 36, 60 are not adjusted until the bar 10 passes the measurement position. I am trying. This is a bar 1
The temperature change within 0 indicates that the CCD camera 32, 52
This is because it is a range (about 40 ° C. to 60 ° C.) that falls within the light receiving sensitivity range of. However, in order to make a more accurate measurement, the throttling mechanism 3 is adjusted according to the temperature change in one rod 10.
You may make it adjust 6,60. In addition, the cross-sectional shape of the bar 10 to be measured is not limited to the circular shape, as shown in FIG.
It is also possible to measure the dimensions of the rectangular rod 10 as shown in (b).

Here, when the bar 10 is horizontally displaced with respect to the running center C as shown in FIG. 4, the self-emission of the bar 10 caught by the CCD camera 52 for measuring the deviation amount. , As an electric signal graph as shown in FIG. Since the center of the displacement amount measuring CCD camera 52 coincides with the running center C of the bar 10, the bar 10 can be seen from the graph.
The deviation amount of is detected. Then, based on the temperature of the bar 10 and the correction amount data shown in FIG.
The diameter data obtained by the CD camera 32 is corrected,
Thereby, the exact diameter of the rod 10 is measured.

As described above, in this embodiment, since the self-luminous light generated from the rod 10 is used, it is not necessary to provide a dedicated light source, and the replacement and maintenance of the light source can be omitted. Further, the diaphragm mechanisms 36 and 60 can be adjusted and the detection data can be corrected in accordance with the temperature change of the rod 10 and the deviation of the position with respect to the CCD camera 32 for measuring the dimension, so that an accurate diameter measurement is always achieved. To be done. Moreover, since the entire measuring device can be arranged away from the bar 10 in a high temperature state, it is possible to prolong the machine life without being affected by the radiant heat from the bar 10 or the vibration generated by the cutting device. You can make accurate measurements. Further, even if the size of the rod 10 is changed, it is not necessary to adjust the position of the measuring device, and the cycle time required for order change can be shortened.

[0022]

[Other Embodiments] The diameter measuring device according to the present invention is not limited to the structure according to the above-mentioned embodiment, and the following structure can be adopted, for example.

Regarding the correction of the horizontal movement of the rod 10, the lens 30 in the dimension measuring CCD camera 32 is configured to be positionally adjustable, and the rod detected by the displacement measuring CCD camera 52. The focus of the dimension measurement CCD camera 32 may be mechanically adjusted by adjusting the position of the lens 30 based on the deviation amount of 10 (see FIG. 7).

As to the adjustment of the first diaphragm mechanism 36 and the second diaphragm mechanism 60, as shown in FIG.
A temperature sensor 64 for detecting the temperature of the first diaphragm mechanism 36 is separately provided based on the temperature detected by the sensor 64.
The opening degree of the slit 42 and the opening degree of the slit 58 in the second diaphragm mechanism 60 may be adjusted. Regarding the configuration of the diaphragm mechanism 36 (60), the amount of light is adjusted by the opening of the slit 42 (58) defined between the pair of shield plates 38, 38 (54, 54) as in the embodiment. Not limited to this, for example, a configuration in which a plurality of blades are combined and the blades are moved relative to each other to change the opening area of the center through which light is transmitted can be adopted. Further, a plurality of filters having different amounts of light transmission may be prepared and a filter corresponding to the temperature of the rod 10 may be selected. Furthermore, the diaphragm mechanisms 36 and 60 are not limited to the above-mentioned various mechanical ones, and, for example, by applying an electric displacement (voltage) to a block that does not transmit light and has no mechanical moving parts. An electric diaphragm means that allows the block to transmit light can also be appropriately adopted. Further, the deviation amount measuring image pickup means and the second diaphragm means are not only installed in a direction perpendicular to the dimension measuring image pickup means and the first diaphragm means, but also at an arbitrary angle capable of detecting the correction signal. You can also set it.

[0025]

As described above, according to the diameter measuring apparatus for a high temperature material according to the present invention, the diameter is measured by using the light emitted from the material itself, and therefore the dedicated light source for the measurement is not required, No need to replace or adjust the light source, and running costs can be kept low. Moreover, since the measuring device can be arranged at a position separated from the high temperature material, it is possible to prevent a failure or a shortening of the mechanical life due to the radiant heat from the material. Further, it is not necessary to adjust the position of the apparatus itself every time the order is changed, and the cycle time required for changing the order can be shortened to improve the manufacturing efficiency.

Further, the deviation of the position of the high temperature material with respect to the dimension measuring image pickup means is detected by the deviation amount measuring image pickup means to correct the data obtained by the dimension measuring image pickup means or move the lens. It can be adjusted to adjust the focus. Further, even when the temperature of the high temperature material changes, the diaphragm unit can always input the optimum amount of light to the dimension measurement image pickup unit and the deviation amount measurement image pickup unit, so that accurate diameter measurement can always be achieved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a diameter measuring device according to a preferred embodiment of the present invention.

FIG. 2 is a graph showing an optimum opening degree of a slit in a diaphragm mechanism according to a temperature of a bar.

FIG. 3 is an electric graph diagram of self-luminous emission of a bar strip caught by a CCD camera for measuring dimensions.

FIG. 4 is an explanatory diagram showing a positional relationship between a center of a displacement amount measuring CCD camera and a traveling center of a bar.

FIG. 5 is an electrical graph diagram of self-luminous light caught by the CCD camera for measuring the deviation amount when the bar is deviated from the running center.

FIG. 6 is a graph showing a relationship between a horizontal deviation amount and correction amounts of diameter data in rods having different thicknesses.

FIG. 7 is a schematic configuration diagram showing a diameter measuring device according to another embodiment of the present invention.

FIG. 8 is a schematic configuration diagram showing a diameter measuring device according to a conventional technique.

FIG. 9 is a schematic configuration diagram showing a state in which the position of the diameter measuring device according to the related art is adjusted in accordance with the change in the diameter of the rod.

[Explanation of symbols]

 10 bar line 30 lens 32 CCD camera for dimension measurement 34 diameter calculation means 36 first aperture mechanism 52 CCD camera for displacement amount measurement 60 second aperture mechanism 64 temperature sensor

Claims (4)

[Claims] 1. A device for measuring a diameter of a high temperature material (10) traveling in a high temperature state, the device being arranged at a position intersecting a traveling direction of the high temperature material (10), and self-luminous of the material (10). Measuring means for detecting dimensions
(32) and the high temperature material (10) and the image pickup means for dimension measurement (32) are arranged between the image pickup means (3) for dimension measurement according to the temperature of the material (10).
A first diaphragm means (36) for adjusting the amount of light input to 2), and a displacement amount arranged at a position intersecting the traveling direction of the high temperature material (10) and detecting self-luminous light of the material (10). An image pickup means for measurement (52), arranged between the high temperature material (10) and the image pickup means for deviation amount measurement (52), and the image pickup means for deviation amount measurement according to the temperature of the material (10) ( Second diaphragm means (60) for adjusting the amount of light input to 52)
And a diameter calculation means (34) for calculating the diameter of the high temperature material (10) based on the detection data of the dimension measurement imaging means (32), and the deviation amount measurement imaging means (52) High Temperature Material (10)
Is characterized in that it is configured to detect the amount of positional deviation with respect to the dimension measurement imaging means (32) and electrically correct the diameter dimension data of the high temperature material (10) based on the amount of deviation. High temperature material diameter measuring device. 2. A device for measuring a diameter of a high temperature material (10) traveling in a high temperature state, the device being arranged at a position intersecting a traveling direction of the high temperature material (10), and self-luminous of the material (10). The image pickup means for dimension measurement (32) for forming an image by the lens (30) for detection, and the high temperature material (10) and the image pickup means for dimension measurement (32) are arranged between the temperature of the material (10). Depending on the size of the measurement means (3
A first diaphragm means (36) for adjusting the amount of light input to 2), and a displacement amount arranged at a position intersecting the traveling direction of the high temperature material (10) and detecting self-luminous light of the material (10). An image pickup means for measurement (52), arranged between the high temperature material (10) and the image pickup means for deviation amount measurement (52), and the image pickup means for deviation amount measurement according to the temperature of the material (10) ( Second diaphragm means (60) for adjusting the amount of light input to 52)
And a diameter calculation means (34) for calculating the diameter of the high temperature material (10) based on the detection data of the dimension measurement imaging means (32), and the deviation amount measurement imaging means (52) High Temperature Material (10)
Is configured to detect the amount of positional deviation with respect to the dimension measuring image pickup means (32), and move the lens (30) based on the detected amount of displacement to adjust the focus of the dimension measuring image pickup means (32). An apparatus for measuring a diameter of a high temperature material, which is characterized in that 3. The temperature of the high-temperature material (10) is calculated from the detection data by the dimension measuring image pickup means (32), and the first and second diaphragm means (36, 60) are adjusted based on the calculated temperature. The high temperature material diameter measuring device according to claim 1 or 2, which is configured to do so. 4. A temperature sensor (6) for measuring the temperature of the high temperature material (10).
The diameter measuring device for a high temperature material according to claim 1 or 2, wherein the diameter is detected by 4) and the first and second throttle means (36, 60) are adjusted based on the detected temperature.