基于单近红外激光波长调制光谱的CH/CH双气敏传感系统。
CH/CH dual-gas sensing system based on wavelength modulation spectroscopy using a single near infrared laser.
作者信息
Zou Mingli, Sun Liqun, Wang Xuan
机构信息
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China.
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2022 May 5;272:120970. doi: 10.1016/j.saa.2022.120970. Epub 2022 Jan 31.
For sensitive and accurate methane (CH) and ethane (CH) simultaneous detection, a near-infrared dual-gas sensing system based on wavelength modulation spectroscopy (WMS) was developed. A fiber-coupled distributed feedback (DFB) diode laser emitting at 1.684 μm was employed as light source. The scanning and modulation signals applied to the injection current of the laser were designed based on time division multiplexing (TDM) to realize the dual-gas measurement. A White cell with absorption path length of 16 m was utilized. The light intensity signal detected was processed with python based digital quadrature lock-in amplifier to obtain first and second harmonic signals. Allan deviation analysis yielded detection limits of 23.53 ppb for CH and 146.4 ppb for CH in an average time of 100 s.
为了实现对甲烷（CH）和乙烷（CH）的灵敏且准确的同时检测，开发了一种基于波长调制光谱（WMS）的近红外双气体传感系统。采用了一个发射波长为1.684μm的光纤耦合分布反馈（DFB）二极管激光器作为光源。基于时分复用（TDM）设计施加到激光器注入电流上的扫描和调制信号，以实现双气体测量。使用了一个吸收光程长度为16m的怀特池。检测到的光强信号通过基于Python的数字正交锁相放大器进行处理，以获得一次和二次谐波信号。通过艾伦偏差分析得出，在平均时间为100s时，甲烷的检测限为23.53ppb，乙烷的检测限为146.4ppb。
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