31 December 2008 A methane gas sensor using correlation spectroscopy
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Proceedings Volume 7130, Fourth International Symposium on Precision Mechanical Measurements; 713010 (2008) https://doi.org/10.1117/12.819574
Event: Fourth International Symposium on Precision Mechanical Measurements, 2008, Anhui, China
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.
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Jingchao Zhang, Jingchao Zhang, Fang Liang, Fang Liang, Lijun Guan, Lijun Guan, Changjiang Xiao, Changjiang Xiao, } "A methane gas sensor using correlation spectroscopy", Proc. SPIE 7130, Fourth International Symposium on Precision Mechanical Measurements, 713010 (31 December 2008); doi: 10.1117/12.819574; https://doi.org/10.1117/12.819574
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