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Proceedings Paper

Signal analytical processing based on wavelet transform for tunable diode laser absorption spectroscopy
Author(s): Hua Xia; Feng-zhong Dong; Zhi-rong Zhang; Guo-jie Tu; Tao Pang; Bian Wu; Yu Wang
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Paper Abstract

Gas analysis based on tunable diode laser absorption spectroscopy (TDLAS) provides features of high sensitivity, fast response and high selectivity. When target gas concentration is below a few parts-per-million spectrometers become more and more sensitive towards noise, interference, drift effects and background changes associated with low level signals. It is purpose of this paper to address some of the problems which are encountered at this low signal levels and to describe a signal processing strategy for gas monitoring with wavelet transform. Different parameters of wavelet by taking gas detection of H2S as an illustration are studied and an improved wavelet-based signal enhancement process is proposed based on the feature of TDLAS second-harmonic signal. The algorithm uses bior3.9 wavelet basic function and multi-resolution decomposition. The results show a plausible improvement in performance of TDLAS system and enhancement of detection limit from 10ppm to hundreds of ppb level under various noise conditions.

Paper Details

Date Published: 9 November 2010
PDF: 8 pages
Proc. SPIE 7853, Advanced Sensor Systems and Applications IV, 785311 (9 November 2010); doi: 10.1117/12.871629
Show Author Affiliations
Hua Xia, Anhui Institute of Optics and Fine Mechanics (China)
Feng-zhong Dong, Anhui Institute of Optics and Fine Mechanics (China)
Zhi-rong Zhang, Anhui Institute of Optics and Fine Mechanics (China)
Guo-jie Tu, Anhui Institute of Optics and Fine Mechanics (China)
Tao Pang, Anhui Institute of Optics and Fine Mechanics (China)
Bian Wu, Anhui Institute of Optics and Fine Mechanics (China)
Yu Wang, Anhui Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 7853:
Advanced Sensor Systems and Applications IV
Brian Culshaw; Yanbiao Liao; Anbo Wang; Xiaoyi Bao; Xudong Fan; Lin Zhang, Editor(s)

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