摘要

以输出波长为1578 nm的分布式反馈半导体激光器作为激发光源,结合波长调制及二次谐波技术对H2S痕量气体进行基于石英增强光声光谱技术(QEPAS)的检测研究。采用有限元分析法对QEPAS中常用的石英音叉进行仿真计算,得到石英音叉的前6阶模态振型与共振频率。实验中,添加了长为4 mm、内径为0.7 mm的声波微共振腔,优化了跨阻放大电路,在最优实验条件下对H2S气体进行检测,检测结果表明,QEPAS系统的二次谐波信号与H2S浓度具有良好的线性关系,获得的探测极限为19.3×10 -6。

Abstract

By combining the wavelength demodulation and second harmonics, the trace H2S gas is detected based on the quartz-enhanced photoacoustic spectroscopy (QEPAS). A distributed feedback semiconductor laser with an output wavelength of 1578 nm is used as the excitation source. Furthermore, a finite element analysis method is used in the simulation calculation for a quartz tuning fork, typically used in QEPAS systems, to obtain its first six modes and resonance frequencies. In an experiment, an acoustic micro-resonator with a length of 4 mm and an inner diameter of 0.7 mm is added, and a transimpedance amplifying circuit is optimized to detect the H2S gas under optimal experimental conditions. The results denote that the second harmonic signal of the QEPAS system exhibits a strongly linear relation with the H2S gas concentration, and a detection limit of 19.3×10 -6 is obtained.

补充资料

中图分类号：O433.5

DOI：10.3788/LOP56.213001

所属栏目：光谱学

收稿日期：2019-04-18

修改稿日期：2019-05-06

网络出版日期：2019-11-01

作者单位    点击查看

联系人作者：方勇华(zlleva@foxmail.com)

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