傅里叶变换红外光谱仪的微弱干涉信号检测电路设计

量子电子学报 ›› 2019, Vol. 36 ›› Issue (6): 677-683.

傅里叶变换红外光谱仪的微弱干涉信号检测电路设计

江婷1,2，高闽光1，李胜1,童晶晶1，李相贤1

1中国科学院安徽光学精密机械研究所环境光学与技术重点实验室，安徽合肥 230031；
2中国科学技术大学，安徽合肥230026

收稿日期:2018-01-02 修回日期:2018-11-05 出版日期:2019-11-28 发布日期:2019-11-19
通讯作者: 高闽光（1962.11—），男，安徽合肥人，研究员，博士生导师，博士，长期从事环境光学与环境遥感检测技术领域的研究， E-mail:mggao@aiofm.ac.cn.
作者简介:江婷（1993.10—），女，安徽合肥人，硕士生，检测技术与自动化装置专业，研究方向为光电信号检测与处理。
基金资助:
Supported by National Natural Science Foundation of China(国家自然科学基金面上项目41375027), National key R & D project(国家重点研发计划项目2017YFC0209902)

Weak Interference Signal Detection Circuit Design Based on Fourier Transform Infrared Spectrometer

JIANG Ting1,2, GAO Minguang1, LI Sheng1,TONG Jingjing1，LI xiangxian1

1 Key Lab of Environment Optics & Technology, Anhui Institute of Optics and Fine Mechanics, CAS, Hefei 230031, China; 2 University of Science and Technology of China, Hefei 230026

Received:2018-01-02 Revised:2018-11-05 Published:2019-11-28 Online:2019-11-19

摘要/Abstract

摘要： 傅里叶变换红外光谱技术由于光通量大、光谱范围宽、分辨率高等诸多优势在大气环境监测领域得到广泛应用。以傅里叶变换红外光谱仪微弱红外干涉光信号特征和碲镉汞光电导型红外探测器为基础，分析了基于迈克逊干涉方法的傅里叶变换光谱仪干涉光信号特征，设计了一种以窄带滤波法为核心的微弱信号检测电路，建立了等效噪声模型分析电路的噪声性能，采用Tina软件对电路进行了模拟仿真，结果表明该电路在通频带内具有恒定的增益以及群时延，可实现微弱干涉信号无失真放大。将设计的电路应用于傅里叶变换光谱仪中，在室温条件下获得了大气400~7000 cm-1中红外波段光谱，几乎覆盖了常见的大气污染物在中红外波段的吸收峰，可以较好的实现对不同污染气体浓度的分辨与测量。

关键词: FTIR红外光谱仪, 微弱信号, 前置放大电路, 带通滤波

Abstract: Fourier transform infrared spectroscopy due to large flux, wide spectral range, high resolution and many other advantages in the field of atmospheric environment monitoring has been widely used.Based on the weak infrared interference optical signal characteristic of Fourier transform infrared spectrometer and the mercury detector based on the tellurium cadmium mercury photoconductive type infrared detector, the characteristics of the interference optical signal of the Fourier transform spectrometer based on the Michelson interference method are analyzed. Narrowband filter method as the core weak signal detection circuit, the equivalent noise model is established to analyze the noise performance of the circuit. The designed circuit was applied to the Fourier transform spectrometer, and the atmospheric mid-infrared band spectrum of 400-7000cm-1 was obtained at room temperature, almost covering the common absorption peak of atmospheric pollutants in the mid-infrared band, which could be better Achieve the resolution of different concentrations of pollutants and measurement.

Key words: photodetector, weak signal;preamplifier circuit, band pass filter;

中图分类号:

TN215

江婷, 高闽光, 李胜, 童晶晶, 李相贤. 傅里叶变换红外光谱仪的微弱干涉信号检测电路设计[J]. 量子电子学报, 2019, 36(6): 677-683.

JIANG Ting, GAO Minguang, LI Sheng, TONG Jingjing, LI xiangxian. Weak Interference Signal Detection Circuit Design Based on Fourier Transform Infrared Spectrometer[J]. Chinese Journal of Quantum Electronics, 2019, 36(6): 677-683.

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