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Quantum cascade laser based sensor for open path measurement of atmospheric trace gases
Author(s): Hao Deng; Juan Sun; Ningwu Liu; Junya Ding; Zhou Chao; Lei Zhang; Jingsong Li
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Paper 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.

Paper Details

Date Published: 10 February 2017
PDF: 5 pages
Proc. SPIE 10250, International Conference on Optical and Photonics Engineering (icOPEN 2016), 1025020 (10 February 2017); doi: 10.1117/12.2266820
Show Author Affiliations
Hao Deng, Anhui Univ. (China)
Juan Sun, Anhui Univ. (China)
Ningwu Liu, Anhui Univ. (China)
Junya Ding, Anhui Univ. (China)
Zhou Chao, Anhui Univ. (China)
Lei Zhang, Anhui Univ. (China)
Jingsong Li, Anhui Univ. (China)


Published in SPIE Proceedings Vol. 10250:
International Conference on Optical and Photonics Engineering (icOPEN 2016)
Anand Krishna Asundi; Xiyan Huang; Yi Xie, Editor(s)

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