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Proceedings Paper

A methane gas sensor using correlation spectroscopy
Author(s): Jingchao Zhang; Fang Liang; Lijun Guan; Changjiang Xiao
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Paper Abstract

Differential absorption and harmonic detection techniques are always used to eliminate the intensity fluctuation and optical path interference. However, the cross-talk of gases is not eliminated. For this problem, a correlation spectroscopy method is proposed. In this paper, we analyze the theory of the system in detail. A method for methane gas sensing using a 1.6um LED as a light source is demonstrated based on the analysis of the near infrared spectral absorption of methane as well as the factors such as compatibility with the transmission characteristics of silica optical fiber and the price. The experiment result is shown and proves that the proposed method is practical for both theory and experiment within the error. The repeatability and stability are well. The method inherits the excellence of the traditional correlation spectroscopy, which has high selective characteristics. It can eliminate cross-talk of carbon dioxide etc. Then the sensitivity of the methane detection is enhanced. The system can be used to detect other gases by changing source, so it is general.

Paper Details

Date Published: 31 December 2008
PDF: 6 pages
Proc. SPIE 7130, Fourth International Symposium on Precision Mechanical Measurements, 713010 (31 December 2008); doi: 10.1117/12.819574
Show Author Affiliations
Jingchao Zhang, Yanshan Univ. (China)
Fang Liang, Yanshan Univ. (China)
Lijun Guan, Yanshan Univ. (China)
Changjiang Xiao, Yanshan Univ. (China)


Published in SPIE Proceedings Vol. 7130:
Fourth International Symposium on Precision Mechanical Measurements
Yetai Fei; Kuang-Chao Fan; Rongsheng Lu, Editor(s)

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