准连续激光调制吸收光谱的解调方法研究

发布时间：2018-03-15 09:13

本文选题：可调谐激光吸收光谱　切入点：准连续信号　出处：《光谱学与光谱分析》2014年05期 　论文类型：期刊论文

【摘要】：针对准连续激光调制吸收光谱谐波信号的解调,设计了一种专用的准连续软件锁相放大器,对采集的数据做有效性判断、无效数据滤除、数字相敏检测、数字滤波等处理,实现了准连续激光调制吸收光谱的谐波信号解调。构建气体检测实验系统,对准连续软件锁相放大器和商品化的高性能锁相放大器进行了对比实验,结果表明,使用准连续软件锁相放大器的Allan方差比后者小1个数量级、检测限低2倍。并能够解决小占空比时的信号失锁问题,具有小的信号波形失真。
[Abstract]:In order to demodulate the harmonic signal of quasi-continuous laser modulation absorption spectrum, a special quasi-continuous software phase-locked amplifier is designed to judge the validity of the collected data, to filter invalid data, to detect digital phase sensitivity, and to deal with digital filtering. The harmonic signal demodulation of quasi-continuous laser modulation absorption spectrum is realized. The gas detection experiment system is constructed, and the contrast experiments between the continuous software phase-locked amplifier and the commercialized high-performance phase-locked amplifier are carried out. The results show that, The Allan variance of the quasi-continuous software phase-locked amplifier is one order of magnitude less than that of the latter, and the detection limit is 2 times lower than that of the latter, and it can solve the problem of signal loss of lock when the duty cycle is small, and has small waveform distortion.
【作者单位】：河北工业大学电磁场与电器可靠性省部共建重点实验室;天津机电职业技术学院电气电子技术应用系;天津大学精密测试技术及仪器国家重点实验室;
【基金】：国家重大科学仪器设备开发专项(2012YQ06016501)资助
【分类号】：TN248;TN911.3

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