基于锁相放大的被动红外信号处理方法研究  

Research on Passive Infrared Signal Processing Method Based on Lock-in Amplifier

作　　者：王云云 乔延利 李杨裕 郭腾霄 崔方晓 吴军 李大成 Wang Yunyun;Qiao Yanli;Li Yangyu;Guo Tengxiao;Cui Fangxiao;Wu Jun;Li Dacheng(College of Environmental Science and Optoelectronic Technology,University of Science and Technology of China,Hefei,Anhui 230026,China;Key Laboratory of Optical Calibration and Characterization,Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei,Anhui 230031,China;State Key Laboratory of NBC Protection for Civilian,Beijing 102205,China)

机构地区：[1]中国科学技术大学环境科学与光电技术学院,安徽合肥230026 [2]中国科学院合肥物质科学研究院安徽光学精密机械研究所通用光学定标与表征技术重点实验室,安徽合肥230031 [3]国民核生化灾害防护国家重点实验室,北京102205

出　　处：《光学学报》2021年第7期74-80,共7页Acta Optica Sinica

基　　金：中国科学院创新基金(CXJJ-19S002)。

摘　　要：被动红外气体遥测系统具有成本低、体积小、便于扩展等优点。利用窄带滤光片进行被动红外气体探测时,为抑制信号漂移和背景噪声干扰,需要对信号进行调制、滤波和锁相处理。系统接收的测量信号受斩光器辐射的影响较大,需要对测量过程进行辐射建模分析。本文研究了基于锁相放大的被动红外探测辐射模型,提出了在锁相放大算法后添加相位判断的信号处理方法;设计并搭建了被动式气体多光谱探测系统,在实验室对系统进行定标,并开展了不同温度黑体的测量实验。结果表明:实际测量的各通道辐射值与所建模型的结果比较吻合。本研究为基于锁相放大的被动红外信号提供了模型基础和实验验证,并为便携式近距离气体遥测系统的研制提供了参考。The passive infrared remote sensing system for gas detection has the advantages of low costs,small volume,and easy expansion.Due to signal drift and background noise interference in passive infrared gas detection based on narrow-band pass filters,it is necessary to modulate,filter and phase-lock the signal.In addition,the measurement signal received by the system is greatly by photochopper radiation,so we should establish a radiation model for the measurement process.In light of this,we investigated a radiation model for passive infrared detection based on a lock-in amplifier in this paper and proposed a signal processing method with phase judgment after the lock-in amplifier.Furthermore,we designed and built a passive multispectral system for gas detection,which was calibrated in the laboratory,and we also carried out blackbody measurements at different temperatures.The results show that the measured radiance on each channel is consistent with that from the established model.This study provides a model basis and experimental verification for passive infrared signals based on lock-in amplifiers,as well as a reference for the development of portable remote sensing systems for gas detection in a short range.

关 键 词：测量 被动红外 辐射模型 锁相放大 相位判断 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]