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介绍了一种利用分布反馈(DFB)可调谐半导体激光器吸收光谱技术(TDLAS)实现甲烷气体浓度监测系统。不同于直接测量气体吸收前后光源强度的变化值,TDLAS通过提取二次谐波幅值信息,在频域换算气体浓度,因此具有更高的稳定性和精确度。同时对不同输出特性的DFB半导体激光器进行对比研究,分析光源的波长调谐特性及功率-电流特性对实际应用的影响。
A methane gas concentration monitoring system based on Distributed Feedback (DFB) Tunable Semiconductor Laser Absorption Spectroscopy (TDLAS) is presented. Unlike the direct measurement of changes in light source intensity before and after gas absorption, TDLAS has higher stability and accuracy by extracting the second harmonic amplitude information and converting the gas concentration in the frequency domain. At the same time, DFB semiconductor lasers with different output characteristics are compared and analyzed, and the wavelength tuning characteristics and power-current characteristics of the light source are analyzed.