Highly-Accuract Mid-Infrared Atmospheric Methane Sensor System

被引：4
|
作者：
Ye W.-L. [1 ]
He X. [1 ]
Meng Y.-X. [1 ]
Zheng Z.-D. [1 ]
Zheng C.-T. [2 ]
机构：
[1] College of Engineering, Shantou University, Shantou, 515063, Shandong
[2] State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun
来源：
Ye, Wei-Lin (wlye@stu.edu.cn) | 1600年 / Chinese Optical Society卷 / 46期
基金：
中国国家自然科学基金;
关键词：
Gas detection; Infraed spectroscopy; Methane measurement; Tunable diode laser;
D O I：
10.3788/gzxb20174611.1128003
中图分类号：
学科分类号：
摘要：
A highly-accurate atmospheric CH4 sensor system using mid-infrared room-temperature Continuous-Wave (CW) Interband Cascade Laser (ICL) was reported. The emitting wavenumber range of the ICL is from 2 998.4 to 2 999.6 cm-1, which covers a strong CH4 absorption line at 2 999.06 cm-1. In order to enhance CH4 absorption, a multi-pass gas cell with a volume of 220 mL, optical path length of 54.6 m was employed. A LabVIEW platform as well as a Data Acquisition Card (DAQ) was used to generate the scan and modulation signal of the ICL and extract the second harmonic signal from the detector output signal. Experimental results showed that when the averaging sampling time was 3.3 s, the Allan deviation of the sensor system was 11.2 ppbv. This sensor system was used to measure the atmospheric CH4 inside and outside the laboratory for a long time, and it is proved to be of great practical value in engineering. © 2017, Science Press. All right reserved.
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