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Proceedings Paper

Experimental and modeling study of off-beam quartz-enhanced photoacoustic detection of nitrogen monoxide (NO) using a quantum cascade laser
Author(s): Chao Shi; Zhili Li; Wei Ren
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Paper Abstract

This article presents the experimental and modeling study of quartz-enhanced photoacoustic detection of nitrogen monoxide (NO) using the off-beam configuration and a distributed-feedback (DFB) quantum cascade laser (QCL) at 5.26 μm as the excitation source. Trace gas monitoring of NO is one of the important subjects for both environmental protection and human health monitoring. Quartz-enhanced photoacoustic spectroscopy (QEPAS) with on-beam configuration is mostly adopted for gas detection. In comparison, the off-beam approach has not only comparative detection sensitivity but also significant advantage of simpler installation and optical alignment. We optimized the sensor performance by adjusting the horizontal and vertical distances between the micro-resonator (mR) and the QTF prongs. Pressure and humidity are two important factors affecting the photoacoustic signal. The effects of both parameters on the NO concentration determination were investigated.

Paper Details

Date Published: 14 November 2016
PDF: 6 pages
Proc. SPIE 10025, Advanced Sensor Systems and Applications VII, 100250L (14 November 2016); doi: 10.1117/12.2246368
Show Author Affiliations
Chao Shi, The Chinese Univ. of Hong Kong (Hong Kong, China)
Zhili Li, The Chinese Univ. of Hong Kong (Hong Kong, China)
Wei Ren, The Chinese Univ. of Hong Kong (Hong Kong, China)


Published in SPIE Proceedings Vol. 10025:
Advanced Sensor Systems and Applications VII
Tiegen Liu; Shibin Jiang; Rene Landgraf, Editor(s)

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