Carbon monoxide gas detection system based on VCSEL using TDLAS technology

Hou-quan Lian; Biao Wang; Yong-bo Yu; Lin-xiang Cheng; Tong-xin Dai; Shuo Huang

doi:10.1117/12.2603008

2 July 2021 Carbon monoxide gas detection system based on VCSEL using TDLAS technology

Hou-quan Lian, Biao Wang, Yong-bo Yu, Lin-xiang Cheng, Tong-xin Dai, Shuo Huang

Proceedings Volume 11887, International Conference on Sensors and Instruments (ICSI 2021); 118871O (2021) https://doi.org/10.1117/12.2603008
Event: International Conference on Sensors and Instruments 2021, 2021, Qingdao, China

Abstract

Compared with traditional distributed feedback (DFB) lasers, Vertical cavity surface emitting laser (VCSEL) have the advantages of low power consumption and small volume in the application of TDLAS (Tunable Diode Laser Absorption Spectroscopy). In this work, a trace CO (carbon monoxide) gas detection system is made based on a VCSEL laser. We first studied the laser spectrum theory of CO, and then select the near-infrared a bsorption peak of 1568 nm as a CO characteristic absorption peak. We also made a digital lock-in amplifier (DLIA) based on FPGA which uses digital square wave instead of the traditional sine wave as reference sources. This reduces the system complexity and improves the system stability. In trace gas detection, the detection limit of the system is 88ppm and detection precision is 3%.

Citation Download Citation

Hou-quan Lian, Biao Wang, Yong-bo Yu, Lin-xiang Cheng, Tong-xin Dai, and Shuo Huang "Carbon monoxide gas detection system based on VCSEL using TDLAS technology", Proc. SPIE 11887, International Conference on Sensors and Instruments (ICSI 2021), 118871O (2 July 2021); https://doi.org/10.1117/12.2603008

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