Temperature Measurement Performance of Reflector Infrared Devices on Low-Reflectivity Objects
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摘要:
测温准确度较低是制约红外测温在精准测温领域应用的重要因素。目前红外测温的主要测量对象是低反射率物体，简称为低反体。针对传统红外装置在低反体精准测温方面的不足，采用反射器替换传统红外装置的镜头制成反射器红外装置，以提高其对低反体的测温性能。计算和测试结果显示，F数为1的红外镜头被替换为反射器后，红外装置对低反体的辐射收集能力和测温准确度提高约4倍。此外，低反体充满视场后，反射器红外装置的温度测量结果与测量距离无关。反射器红外装置有望用于科研和工业领域的高精度红外测温。
Abstract:The low accuracy of temperature measurements is a significant factor that restricts the application of infrared temperature measurements in precise temperature measurement fields. Presently, the primary objects for infrared temperature measurement are those with low reflectivity, referred to as low-reflectivity objects. To address the deficiencies of conventional infrared devices, a reflector infrared device was developed by replacing the lens of a conventional infrared device with a reflector, thereby enhancing its temperature measurement performance on low-reflectivity objects. Calculations and experimental results indicated that, after replacing the F/1 infrared lens with a reflector, the radiation collection capability and temperature measurement accuracy of the infrared device for low-reflectivity objects improved by approximately four times. Furthermore, when the field of view was filled with a low-reflectivity object, the temperature measurement results of the reflector-infrared device were independent of measurement distance. Infrared reflector devices are promising candidates for high-precision infrared temperature measurements in both scientific research and industrial applications.
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图 1 两种反射器红外装置对低反体测温时的示意图
Figure 1. Schematic diagram of two types of reflector infrared devices for temperature measurement of low-reflectivity object
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图 2 入射到圆锥型反射器红外装置感光面的辐射组成示意图
Figure 2. Schematic diagram of the radiation composition incident on the sensitive surface of the conical reflector infrared device
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图 3 传统红外装置及其镜头控温
Figure 3. Conventional infrared device and its lens temperature control
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图 4 反射器红外装置的三维图
Figure 4. Three-dimensional pictures of two reflector infrared devices
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图 6 三种红外装置在不同测量距离的相对辐照度
Figure 6. Relative irradiance of three infrared devices at different measurement distances
表 1 仪器读数方程的系数
Table 1 Device reading equation's coefficients
Types U (×105) V (×106) W(×104) RMSE R2 (R-square) Parabolic reflector infrared device 14.63±0.04 0.838±0.0046 −2.463±0.009 6.122 1 Conical reflector infrared device 14.37±0.003 0.881±0.004 −2.486±0.007 5.917 1 Conventional infrared device 3.929±0.016 1.906±0.04 −2.436±0.07 6.159 1 
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表 2 不同测量距离的反射器红外装置的仪器读数
Table 2 Device readings of reflector infrared device at different measurement distances
Measurement distances L=10 mm L=20 mm L=30 mm L=40 mm Conical reflector infrared device (17℃ blackbody) 9471.3 9467.4 9462.7 9473.2 Parabolic reflector infrared device (20℃ blackbody) 10189.4 10190.1 10187.5 10173.7
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表 3 仪器读数和测温结果
Table 3 Device readings and temperature measurement results
Reflector
temperature/℃Rm Temperature measurement result/℃ 12 Rma1=9824
Rma2=9828.1
Rma3=9819.4Ta1=20.987
Ta2=20.999
Ta3=20.97517 Rmb1=9367
Rmb2=9377.4
Rmb3=9384Tb1=16.969
Tb2=16.999
Tb3=17.018
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表 4 测温精密度，准确度及参数U, σr和RMSE
Table 4 Precision, accuracy of temperature measurement, and parameters U, σr, and RMSE
Parameters Parabolic reflector infrared device Conical reflector infrared device Conventional infrared device U 1463000 1437000 392900 σr 4.703 4.852 4.942 σtp/℃ 0.013 0.014 0.051 RMSE 6.122 5.917 6.159 σta/℃ 0.021 0.022 0.081
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