Quantum cascade laser based sensor for open path measurement of atmospheric trace gases

Hao Deng; Juan Sun; Ningwu Liu; Junya Ding; Zhou Chao; Lei Zhang; Jingsong Li

doi:10.1117/12.2266820

10 February 2017 Quantum cascade laser based sensor for open path measurement of atmospheric trace gases

Hao Deng, Juan Sun, Ningwu Liu, Junya Ding, Zhou Chao, Lei Zhang, Jingsong Li

Proceedings Volume 10250, International Conference on Optical and Photonics Engineering (icOPEN 2016); 1025020 (2017) https://doi.org/10.1117/12.2266820
Event: Fourth International Conference on Optical and Photonics Engineering, 2016, Chengdu, China

Abstract

A sensitive open-path gas sensor employing a continuous-wave (CW) distributed feedback (DFB) quantum cascade laser (QCL) and direct absorption spectroscopy (DAS) was demonstrated for simultaneously measurements of atmospheric CO and N₂O. Two interference free absorption lines located at 2190.0175 cm^-1 and 2190.3498 cm^-1 were selected for CO and N₂O concentration measurements, respectively. The Allan variance analysis technique was performed to investigate the long-term performance of the QCL sensor system. The results indicate that a detection limit of 9.92 ppb for CO and 7.7 ppb for N₂O with 1-s integration time were achieved, which can be further improved to 1.5 ppb and 1.1 ppb by increasing the average time up to 80 s.

Citation Download Citation

Hao Deng, Juan Sun, Ningwu Liu, Junya Ding, Zhou Chao, Lei Zhang, and Jingsong Li "Quantum cascade laser based sensor for open path measurement of atmospheric trace gases", Proc. SPIE 10250, International Conference on Optical and Photonics Engineering (icOPEN 2016), 1025020 (10 February 2017); https://doi.org/10.1117/12.2266820

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