改进的可见光-近红外比色测温系统与性能评估

陈金龙; 姜泓宇; 易方正; 王东颖; 刘涛; 胡晓贺

doi:10.12338/j.issn.2096-9015.2022.0211

改进的可见光-近红外比色测温系统与性能评估

doi: 10.12338/j.issn.2096-9015.2022.0211

1.
重庆大学，重庆 400044
2.
西北机电工程研究所，咸阳 712000

基金项目: 国防科工局基础科研项目（JCKY2020208B002）。

详细信息

作者简介:
陈金龙（1993-），重庆大学在读博士研究生，研究方向：光电测控技术与仪器，邮箱：1070314025@qq.com

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出版历程
- 网络出版日期: 2022-12-01

Improved Visible Near-Infrared Colorimetric Thermometry System and Performance Evaluation

1.
Chongqing University, Chongqing 400044, China
2.
Northwest Institute of Mechanical and Electrical Engineering, Xianyang 712000, China

摘要

摘要: 可见光-近红外比色测温系统已经被广泛应用在科研和工业高温监测领域。由于系统的灰度值范围有限，现有研究通常将不同系统参数（曝光时间、光圈）下的测温带宽拼接，以扩展测温范围。然而系统两个通道的灰度值和温度的拟合曲线为指数函数，且两条曲线的增长速度相差较大，将导致系统存在测温带宽变窄、系统灵敏度的线性度差等问题。此外，现有研究对比色测温系统性能的评估和分析方法还不够完善。针对以上问题，本文改进了可见光-近红外比色测温系统，提出用衰减灰度值的方法来扩展系统的测温带宽；使用黑体炉进行标定实验后，对改进后系统和原始系统的通道灵敏度、测温带宽和系统灵敏度进行了比较分析，发现该方法将系统的测温带宽扩展了两倍以上，同时有效地提高了系统灵敏度的线性度；最后将该系统与其他系统的整体性能进行了比较，验证了系统的实用性。
- 可见光-近红外 /
- 比色测温系统 /
- 测温带宽 /
- 灵敏度 /
- 不确定度评估
Abstract: Visible near-infrared colorimetric thermometry system instruments have been widely used in scientific research and industrial high-temperature monitoring. Since the gray value range of the instrument is limited, the existing research usually splices the temperature measurement bandwidth under different system parameters (exposure time, aperture) to extend the temperature measurement range. However, the fitted curves of grayscale values and temperature of the two channels of the system are exponential functions, and the growth rate of the two curves differs significantly, which will lead to the problems of narrowing the temperature measurement bandwidth and poor linearity of the system sensitivity. In addition, the existing evaluation and analysis methods for the performance of colorimetric thermometry system are not perfect. Given the above problems, a set of visible light near-infrared colorimetric thermometry system is developed, and a method of gray value attenuation is proposed to expand the temperature measurement bandwidth of the system. After the calibration experiment with the blackbody furnace is carried out, the channel sensitivity, temperature measurement bandwidth and system sensitivity of the improved and the original systems are compared and analyzed. It is found that this method extends the temperature measurement bandwidth of the instrument by more than two times, and effectively improves the linearity of the system sensitivity. Finally, the system's overall performance is compared with other instruments to verify the practicability of the instrument.
- visible near-infrared /
- colorimetric thermometry system /
- temperature measurement bandwidth /
- sensitivity /
- uncertainty evaluation

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图 1 比色测温系统的结构原理图

Figure 1. Structural schematic diagram of colorimetric thermometry system

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图 2 比色测温系统的标定

Figure 2. Calibration of colorimetric thermometry system

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图 3 标定的系统参数

Figure 3. Calibration of system parameters

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图 4 系统性能评估

Figure 4. System performance evaluation

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图 5 比色测温系统的标准不确定度

Figure 5. Uncertainty of colorimetric thermometry system

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表 1 比色测温系统的标准不确定度项

Table 1. Uncertainty term of colorimetric thermometry system

温度/℃	820	840	860	880	900	920	940	960	980	1000
A通道方差	0.30	0.48	0.57	0.53	1.89	2.42	5.35	7.55	9.75	9.32
B通道方差	0.51	0.57	0.70	0.35	0.47	0.54	1.01	1.31	1.6	1.24
A、B通道的协方差	0.004	0.009	0.183	0.096	0.295	0.572	0.701	0.823	1.187	1.321

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表 2 不同测温系统比较

Table 2. Comparison of various thermometry instruments

系统类型	波段	探测器类别	测温区间	测温带宽	相对误差	标准不确定度	参考文献
比色	695 nm和800 nm	CMOS相机	820℃～1000℃	180℃		0.85%～1.42%	本文
比色		光电传感器	1227℃～2727℃	100℃		3.79%	[5]
多波段	RGB	CCD相机		190℃～265℃		0.13%～2.14%	[8]
多波段	450～850 nm	CMOS相机	600℃～1100℃		$ \pm 0.75\% $		[12]
多波段	RGB	CCD相机	1226℃～2736℃		1.8%		[15]
多波长	500～900 nm	光谱仪	1100℃～1250℃ 和1200℃～1400℃	150/200℃		2%～6%	[21]

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参考文献(21)

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