TDLAS型采用VCSEL光源的H2S气体检测系统的研制

Design of TDLAS H2S gas detection system using VCSEL light source

本文以VCSEL激光作为光源,利用TDLAS技术对硫化氢气体进行检测。对比近红外波段硫化氢及其他常见气体的吸收光谱,确定硫化氢气体的吸收波长为1590 nm,利用波长调制技术对激光器进行调谐,使其输出波长扫过硫化氢气体的吸收谱线。基于VCSEL激光器相比传统DFB激光器具有高效率、低功耗和小体积等优点,TDLAS技术整个系统的功耗大幅降低。通过配比多种浓度的硫化氢标气对检测系统性能进行标定,实验结果表明系统的检测下限达9 g/m^3,并且系统的稳定性和检测单一性表现良好,适用于复杂的工业生产环境中,应用前景广泛。

This article uses VCSEL laser as the light source,and uses TDLAS technology to detect hydrogen sulfide gas.Comparing the absorption spectra of hydrogen sulfide and other common gases in the near-infrared band,the absorption wavelength of hydrogen sulfide gas is determined to be 1590 nm,and the laser is tuned by using a wavelength modulation technique to make its output wavelength sweep the absorption line of hydrogen sulfide gas.Compared with traditional DFB lasers,VCSEL lasers have the advantages of high efficiency,low power consumption and small size.The power consumption of the entire system of TDLAS technology is greatly reduced.The performance of the detection system is calibrated by mixing various concentrations of hydrogen sulfide standard gas.The experimental results show that the detection accuracy of the system is 10 ppm,and the lower detection limit is 9 ppm,and the system stability and detection unity perform well and are suitable for complex industries.In the production environment,the application prospects are broad.