Methane gas sensor based on a novel dual‐path multipass cell

We have developed a novel dual‐path multipass cell (DP‐MPC) for trace gas detection. The sealed Herriott cell, measuring 16 × 16 × 41.5 cm, has two input/output coupling holes. By adjusting the mirror position and incident angle of the beam, optical paths of 105 and 37.5 m can be obtained, respectiv...

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Published inMicrowave and optical technology letters Vol. 66; no. 1
Main Authors Jiang, Gui‐sheng, Wang, Yu‐ting, Liu, Qiang, Chen, Hang, Wang, Shi‐qi, Zhang, Yu, Wang, Zhao‐xiang, Zhang, Hui, Zha, Shen‐long, Wang, Ya, Ma, Hong‐liang
Format Journal Article
LanguageEnglish
Published New York Wiley Subscription Services, Inc 01.01.2024
Subjects
Distributed feedback lasers
double path
gas sensor
Gas sensors
Methane
optical multipass cell
Optical paths
Trace gases
Variance analysis
wavelength modulation spectroscopy
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ISSN0895-2477
1098-2760
DOI10.1002/mop.33794

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Summary:We have developed a novel dual‐path multipass cell (DP‐MPC) for trace gas detection. The sealed Herriott cell, measuring 16 × 16 × 41.5 cm, has two input/output coupling holes. By adjusting the mirror position and incident angle of the beam, optical paths of 105 and 37.5 m can be obtained, respectively. To test its performance, we setup a methane (CH4) concentration detection system by combining the DP‐MPC with a 1.65 μm distributed feedback laser and carried out a methane gas detection experiment. The Allan variance analysis showed that the limit of detection for the two optical paths were 6 and 30 ppb, respectively.
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ISSN:0895-2477
1098-2760
DOI:10.1002/mop.33794