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Optical Engineering

High finesse Fabry–Perot filter for the measurement of methane gas by using multiline absorption spectroscopy
Author(s): Jiansen Ye
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Paper Abstract

A method for the measurement of the concentration of methane is experimentally demonstrated. The broad light source is filtered by using a Fabry–Perot filter, whose wavelength peaks are matched with the methane absorption lines. The matched guided light is absorpted by the methane in the gas cell, which is coated with a film with 100% reflectivity. Therefore, the guided light is reflected a number of times and the sensitivity of the sensor is increased. The experimental results show that a resolution of 0.091% is achieved. In addition, due to the matched wavelength peaks, the influence of the interfering gas can be removed by using the proposed method. Compared with the conventional method, the proposed method possesses low cost, high sensitivity, and high stability.

Paper Details

Date Published: 14 February 2014
PDF: 5 pages
Opt. Eng. 53(2) 024103 doi: 10.1117/1.OE.53.2.024103
Published in: Optical Engineering Volume 53, Issue 2
Show Author Affiliations
Jiansen Ye, Beijing Institute of Technology (China)

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