Online calibration device for thermal infrared imager of special glass kiln

Abstract

The utility model provides an on-line calibration device of a special glass kiln infrared thermal imager, and belongs to the field of infrared thermal imaging temperature detection. Comprising a kiln, the top of the side wall of the kiln is connected with a flue, a thermocouple is installed at a flue opening, a thermal infrared imager is arranged on the side wall right facing the flue, and the position of the flue opening is within the visual angle range of an optical lens of the thermal infrared imager. The temperature of the positions of the kiln and the flue is detected in real time through the thermocouple, the detected temperature value is calibrated through the thermal infrared imager, the thermal infrared imager is fixed to the wall of the kiln, thermal infrared imager equipment does not need to be disassembled, calibration in the on-line working process can be achieved, temperature detection errors caused by repeated installation and disassembly of the equipment are avoided, and the working efficiency is improved. The accuracy of temperature detection is improved, stable production of glass is facilitated, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the field of infrared thermal imaging temperature detection, and in particular relates to an online calibration device for a special glass furnace infrared thermal imager. Background Art

[0002] In order to detect the temperature field distribution inside the glass production kiln, an infrared thermal imaging detection device is installed. Using this device, process personnel can not only directly observe the melting state of the glass liquid and the burning flame and the state of the refractory material of the pool wall inside the kiln, but also use the infrared temperature detection function to detect the real-time temperature value of any point in the field of view, providing a good means for video monitoring and temperature detection inside the glass kiln.

[0003] However, as infrared thermal imaging equipment is used for a longer period of time, its detection accuracy will drift and the temperature error will gradually increase. This is because changes in ambient temperature, long-term operation, aging of the optical lens, changes in the detector's own characteristics, and long-term excitation processes all cause temperature drift. Therefore, it is necessary to regularly calibrate the infrared thermal imager and correct the detection temperature error during the calibration process to ensure the accuracy of the infrared thermal imager's temperature detection.

[0004] The normal infrared thermal imager calibration process requires removing the equipment from the kiln and placing it in a constant-temperature standard room. Using a blackbody furnace and a standard infrared thermometer or thermocouple as a standard, the blackbody furnace temperature is measured (using a standard infrared thermometer or thermocouple) and the temperature difference is compared to correct the infrared thermal imager's detection error. However, for infrared thermal imaging equipment installed in specialty glass kilns, implementing this standard calibration process presents certain challenges: 1. The ambient temperature around the glass kiln is high, and the equipment installation space is narrow, making it difficult to remove and install the equipment on-site. 2. The process of removing and reinstalling the equipment can cause fluctuations in the furnace pressure and internal temperature, hindering stable production. 3. The ambient temperature and humidity in the standard room differ significantly from the on-site kiln environment. Even if an infrared thermal imager with good accuracy after calibration in the standard room is reinstalled in the kiln, the measured temperature value will drift due to the ambient temperature fluctuation. Based on the above reasons, in order to ensure the accuracy of infrared thermal imagers in detecting the internal temperature of the kiln, a simple method is needed to calibrate the temperature detection accuracy of the thermal imager without dismantling the infrared thermal imaging equipment and affecting the stability of the kiln process. Utility Model Content

[0005] The purpose of the utility model is to overcome the problems of repeated disassembly and installation in the existing infrared thermal imager calibration process, which causes fluctuations in the furnace pressure and internal space temperature of the kiln, is not conducive to stable production, and causes inaccurate temperature detection. An online calibration device for a special glass kiln infrared thermal imager is provided.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An online calibration device for an infrared thermal imager of a special glass kiln includes a kiln, a flue connected to the top of the kiln side wall, a thermocouple installed at the flue outlet, an infrared thermal imager arranged on the side wall facing the flue, and the flue outlet is within the viewing angle of the infrared thermal imager optical lens.

[0008] The detection end of the thermocouple is exposed 5 to 15 mm from the inner wall of the flue.

[0009] The flue outlet and the inner wall of the flue are used as blackbody radiation sources.

[0010] The temperature of the flue inner wall and the flue outlet are detected by thermocouples.

[0011] The difference between the temperature of the flue inner wall and the temperature at the flue outlet is calibrated by an infrared thermal imager, and the detected temperature error is corrected during the calibration process.

[0012] The temperature detection range of the infrared thermal imager is 800-1800°C.

[0013] The infrared thermal imager has an infrared thermal image field of view with a pixel count greater than or equal to 2 million.

[0014] The detection wavelength of the infrared thermal imager is 0.98 μm.

[0015] The thermocouple is selected to have a graduation number of B, R, or S.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The utility model provides an online calibration device for an infrared thermal imager of a special glass kiln, comprising a kiln, a flue connected to the top of the kiln side wall, a thermocouple installed at the flue opening, and an infrared thermal imager installed on the side wall facing the flue, wherein the flue opening is within the field of view of the infrared thermal imager optical lens. The temperature of the kiln and the flue is detected in real time by the thermocouple, and the infrared thermal imager calibrates the detected temperature value. The infrared thermal imager is fixed to the wall of the kiln without the need to disassemble the infrared thermal imaging device, and calibration can be achieved during the online working process, thereby avoiding temperature detection errors caused by repeated installation and disassembly of the device, improving the accuracy of temperature detection, facilitating the stable production of glass, and improving production efficiency.

[0018] Furthermore, the straight section of the flue outlet inside the kiln is used as a blackbody radiation source for calibration, without the need to specially set up a blackbody radiation source.

[0019] Furthermore, thermal imaging cameras are calibrated to ensure measurement accuracy, thereby improving the accuracy of glass furnace temperature monitoring. Through real-time monitoring and calibration, the performance of thermal imaging cameras can be ensured to be always in optimal condition, providing reliable data support for production and helping to optimize production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a diagram of the device of the utility model;

[0021] Explanation of the reference numerals in the figure: 1. kiln; 2. flue; 3. infrared thermal imager; 4. thermocouple. DETAILED DESCRIPTION

[0022] In order to further understand the content of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the embodiments are merely for explanation of the present invention and are not intended to limit the present invention.

[0023] like Figure 1 The figure shows an online calibration device for infrared thermal imagers used in specialty glass furnaces. The device includes a furnace 1 and an infrared thermal imager 3 mounted on the rear wall of the furnace, with its lens facing the front wall. A flue opening 2 is located on the front wall of the furnace, facing the rear wall. The flue opening 2 is within the optical field of view of the infrared thermal imager 3, allowing the flue opening to be fully visible in the image captured by the infrared thermal imager 3. A thermocouple 4 is mounted on the flue 2, with its detection tip protruding through the flue wall, leaving 5 to 15 mm of the inner wall exposed.

[0024] Furthermore, the flue 2 opening and the inner wall of flue 2 are used as blackbody radiation sources;

[0025] The temperature T1 of the flue inner wall and the temperature T2 at the flue inlet are detected by thermocouple 4;

[0026] Preferably, the temperature detection range of the infrared thermal imager 3 is 800-1800°C; the number of pixels in the field of view of the infrared thermal imager 3 is greater than or equal to 2 million; the detection wavelength is 0.98 μm; the temperature detection sensitivity unit value is 2°C within the range of 800-1500°C, and the temperature detection error within the range of 800-1800°C does not exceed ±1% of the full scale;

[0027] By adjusting the temperature coefficient of the infrared thermal imaging device and adjusting the difference between the temperature detection value T2 and the blackbody radiation source temperature T1 to within the tolerance range, a simple online calibration process for the infrared thermal imager can be completed.

[0028] As the kiln operates for longer, volatile substances in the furnace atmosphere will gradually condense on the inner wall of the flue opening. In the middle and late stages of the kiln's life, the emissivity value of the refractory material (blackbody radiation source) on the inner wall of the flue needs to be appropriately adjusted during calibration.

[0029] Further, before each online calibration, the front end of the lens should be cleaned to avoid the contamination on the lens affecting the accuracy of detection. The calibration process does not require moving or removing the equipment, nor adjusting the field of view angle or focal length of the infrared thermal imager lens.

[0030] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the present application, but not to limit it, although the above examples are described in detail, those skilled in the art should understand that: the specific embodiments of the present application can be modified or replaced, without departing from the spirit and scope of the present application, any modification or equivalent replacement, which should be covered in the protection scope of the claims of the present application.

Claims

1. An online calibration device for a special glass furnace infrared thermal imager, characterized in that: The invention comprises a kiln (1), the top of the side wall of the kiln (1) is connected to a flue (2), a thermocouple (4) is installed at the mouth of the flue (2), an infrared thermal imager (3) is arranged on the side wall facing the flue (2), and the position of the flue (2) mouth is within the visual range of the optical lens of the infrared thermal imager (3).

2. The online calibration device for a special glass furnace infrared thermal imager according to claim 1, characterized in that: The detection end of the thermocouple (4) is exposed 5 to 15 mm from the inner wall of the flue (2).

3. The online calibration device for a special glass furnace infrared thermal imager according to claim 1, characterized in that: The flue (2) mouth and the inner wall of the flue (2) are used as black body radiation sources.

4. The online calibration device for a special glass furnace infrared thermal imager according to claim 3, characterized in that: The temperature of the inner wall of the flue (2) and the temperature at the flue (2) outlet are detected by a thermocouple (4).

5. The online calibration device for a special glass furnace infrared thermal imager according to claim 4, characterized in that: The difference between the temperature of the inner wall of the flue (2) and the temperature at the flue (2) outlet is calibrated by an infrared thermal imager (3), and the detected temperature error is corrected during the calibration process.

6. The online calibration device for a special glass furnace infrared thermal imager according to claim 1, characterized in that: The temperature detection range of the infrared thermal imager (3) is 800-1800°C.

7. The online calibration device for a special glass furnace infrared thermal imager according to claim 6, characterized in that: The infrared thermal imager (3) has an infrared thermal image field of view with a pixel count of greater than or equal to 2 million.

8. The online calibration device for a special glass furnace infrared thermal imager according to claim 6, characterized in that: The detection wavelength of the infrared thermal imager (3) is 0.98 μm.

9. The online calibration device for a special glass furnace infrared thermal imager according to claim 1, characterized in that: The thermocouple (4) is selected to have a graduation number of one of B, R, and S.

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