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一种红外气体检测中谐波信号锁相放大器的设计     被引量:3

Design of harmonic signal lock-in amplifier in infrared gas detection

文献类型:期刊文献

中文题名:一种红外气体检测中谐波信号锁相放大器的设计

英文题名:Design of harmonic signal lock-in amplifier in infrared gas detection

作者:余亚东[1]

机构:[1]绍兴文理学院电子工程系,浙江绍兴312000

年份:2021

卷号:51

期号:11

起止页码:1460

中文期刊名:激光与红外

外文期刊名:Laser & Infrared

收录:CSTPCD、、北大核心、CSCD、北大核心2020、CSCD_E2021_2022

语种:中文

中文关键词:气体浓度检测;波长调制;锁相放大;相敏检测

外文关键词:gas concentration detection;wavelength modulation;lock-in amplifier;phase sensitive detection

中文摘要:基于波长调制光谱技术,本文设计了一种采用键控法进行相敏检测的二次谐波信号锁相放大器。与传统相敏检测方法相比,键控法相敏检测简化了电路的设计,降低锁相放大器的成本。本文利用MATLAB软件对设计搭建了仿真模型,包括带通滤波器、相敏检测器、低通滤波器等部分。通过对模型进行仿真验证了该设计,在二次谐波信号幅度为0.1 V,高斯带限白噪声方差为10时,输出最大误差在2%以内,且具有良好的线性度。通过仿真表明该方法能够用于气体浓度检测,且方法简单,性价比高。

外文摘要:Based on wavelength modulation spectroscopy technology,a phase-locked amplifier for the second harmonic signal is designed,which used the keying method for phase sensitive detection.Compared with the traditional phase sensitive detection method,the keying method simplifies the design of the circuit and reduces the cost of the lock-in amplifier.In this paper,MATLAB software was used to build the simulation model,including band-pass filter,phase sensitive detector,low-pass filter and so on.When the second harmonic signal amplitude is 0.1 V and the Gaussian band limited white noise variance is 10,the maximum output error is less than 2%and has good linearity.The simulation results show that the method can be used for gas concentration detection,and the method is simple and cost-effective.

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