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Optical Engineering

Mapping of methane spatial distribution around biogas plant with an open-path tunable diode absorption spectroscopy scanning system
Author(s): Shirui Zhang; Jihua Wang; Daming Dong; Wengang Zheng; Xiande Zhao
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Paper Abstract

An open-path tunable diode laser absorption spectroscopy (OP-TDLAS) detector was applied to detect the methane emission from a biogas plant in a dairy farm. Two OP-TDLAS scanning systems were built according to maximum likelihood with expectation minimization (MLEM) and smooth basis function minimization (SBFM) algorithms to reconstruct the two-dimensional (2-D) distribution maps. Six reconstruction maps with the resolution of 30×80 were obtained by the MLEM algorithm with “grid translation method” and three reconstruction maps were obtained by the SBFM algorithm with 2-D Gaussian model. The maximum mixing ratio in the first result was between 0.85 and 1.30 ppm, while it was between 1.14 and 1.30 ppm in the second result. The average mixing ratio in the first result was between 0.54 and 0.49 ppm, and between 0.56 and 0.65 ppm in the second result. The reconstruction results validated that the two algorithms could effectively reflect the methane mixing ratio distribution within the target area. However, with the more simple optical rays and less equipment requirements, the OP-TDLAS scanning system based on SBFM algorithm provides a useful monitoring tool of methane emissions in agricultural production.

Paper Details

Date Published: 6 February 2013
PDF: 9 pages
Opt. Eng. 52(2) 026203 doi: 10.1117/1.OE.52.2.026203
Published in: Optical Engineering Volume 52, Issue 2
Show Author Affiliations
Shirui Zhang, Shanghai Jiao Tong Univ. (China)
Jihua Wang, Shanghai Jiao Tong Univ. (China)
Daming Dong, National Engineering Research Ctr. for Information Technology in Agriculture (China)
Wengang Zheng, National Engineering Research Ctr. for Information Technology in Agriculture (China)
Xiande Zhao, National Engineering Research Ctr. for Information Technology in Agriculture (China)


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