发热筛查热成像系统的测温准确性分析

冯涛; 金伟其; 司俊杰

发热筛查热成像系统的测温准确性分析

冯涛^1,,
金伟其^1, ,,
司俊杰²

1.
北京理工大学光电学院光电成像技术与系统教育部重点实验室，北京 100081
2.
中航工业红外探测器技术航空科技重点实验室，河南洛阳 471009

基金项目:

国家自然科学基金重点项目 61231014

教育部博士点基金优先发展项目 20131101130002

详细信息

作者简介:
冯涛（1977-），男，高级工程师，博士研究生，主要从事红外焦平面探测器及红外热成像技术研究。E-mail：tao.feng@139.com

通讯作者:
金伟其（1961-），男，教授，博士生导师，主要从事夜视与红外技术、光电图像处理、光电检测与仪器的教学和研究。E-mail：jinwq@bit.edu.cn

中图分类号: TN215
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- 被引次数: 0
出版历程
- 收稿日期: 2021-08-19
- 修回日期: 2021-09-09
- 刊出日期: 2021-10-20

Analysis of Temperature Measurement Accuracy in Fever-Screening Thermograph

FENG Tao^1
,,
JIN Weiqi^{1
, ,},
SI Junjie²

1.
School of Optoelectronics, Beijing Institute of Technology, Key Laboratory of Photoelectronic Imaging Technology and System, Ministry of Education of China, Beijing 100081, China
2.
Aviation Key Laboratory of Science and Technology on Infrared Detector, Luoyang 471009, China

摘要

摘要: 介绍了发热筛查热成像系统的发展历程和系统构成及热像仪测温的基本原理，指出热像仪的内辐射对测温准确性具有明显影响，分析了发热筛查热成像系统用黑体参考源消除内辐射影响的工作原理。介绍了发热筛查热成像系统的测温准确性评价模型及其主要参数的要求，逐项分析了这些参数与热像仪噪声、黑体参考源及使用环境等因素的关系，发现热像仪的时间低频噪声和空间低频噪声是影响测温准确性的关键因素，指出黑体参考源可以消除时间低频噪声的影响，基于外挡片的两点校正法可以消除空间低频噪声的影响，从而使发热筛查热成像系统满足人体测温准确性要求。
- 发热筛查热成像系统 /
- 内辐射 /
- 测温准确性 /
- 时间噪声 /
- 空间噪声
Abstract: The development and system composition of a fever-screening thermograph and the basic principle of a thermal imager's temperature measurement are introduced. It is observed that the thermal imager's internal radiation clearly influences the accuracy of the temperature measurement. This paper introduces an evaluation model for the temperature measurement accuracy of a fever-screening thermograph and its main parameters. By analyzing the relationship between these parameters and the thermal imager noise, the blackbody reference source, and the environment, the temporal and spatial low-frequency noise of the thermal imager are found to be the key factors affecting the accuracy of the temperature measurement. Moreover, the influence of temporal low-frequency noise can be eliminated using a blackbody reference source, and the influence of spatial low-frequency noise can be eliminated using the two-point correction method based on an external shutter. Thus, the fever-screening thermograph can meet the accuracy requirements of human body temperature measurement.
- fever screening thermograph /
- internal radiation /
- accuracy of temperature measurement /
- temporal noise /
- spatial noise

HTML全文

图 1 发热筛查热成像系统示意图

Figure 1. Schematic diagram of fever screening thermograph

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图 2 发热筛查红外成像示例

Figure 2. Infrared imaging of fever screening thermograph

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图 3 热像仪接收到的红外辐射

Figure 3. Radiation received by the infrared camera

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图 4 探测器的传感器阵列接收到的所有红外辐射

Figure 4. All infrared radiation received by detector sensor arrays

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表 1 测温结果不确定度的组成参数

Table 1. Parameters of uncertainty of temperature measurement results

Parameters of uncertainty	Parameter content	Value requirements
u_D	Drift of screening thermograph	The combined effect of drift and instability≤0.2℃
u_S	Instability of screening thermograph	The combined effect of drift and instability≤0.2℃
u_U	Non-uniformity of screening thermograph	≤0.2℃
u_MRTD	MRTD of screening thermograph	≤0.1℃
u_ER	External temperature reference source	In the range of 33℃-40℃: Temperature accuracy≤0.3℃ The combined effect of drift and instability≤0.1℃
u_others	Other factors	Not given

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参考文献(16)

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