Mid‐infrared dissolved CO2 measurement system using the ultra‐compact multipass cell

To measure natural gas hydrate, a mid‐infrared dissolved CO2 measurement system is designed using the tunable diode laser spectroscopy with ultra‐compact multipass cell. The QCL laser of 4319 nm has a scanning range from 2315.05 to 2315.40 cm−1, which contains 12CO2 and 13CO2 for isotope measurement...

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Bibliographic Details
Published in:Microwave and optical technology letters 2023-05, Vol.65 (5), p.1319-1323
Main Authors: Chen, Hongda, Chen, Chen, Dong, Weihao, Li, Yongyang, Zhang, Mengru
Format: Article
Language:English
Subjects:
1f+ 3f WMS
Carbon dioxide
Deep sea
fast response time
Gas hydrates
limit of detection
multipass cell
multiplexing multiple spectral lines
Natural gas
Semiconductor lasers
Tunable lasers
Wavelength modulation
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Summary:To measure natural gas hydrate, a mid‐infrared dissolved CO2 measurement system is designed using the tunable diode laser spectroscopy with ultra‐compact multipass cell. The QCL laser of 4319 nm has a scanning range from 2315.05 to 2315.40 cm−1, which contains 12CO2 and 13CO2 for isotope measurement and wide range of concentration detection. The optimized 3f + 1f wavelength modulation method reduces the limit of detection to 7.1 ppbv. An ultra‐compact multi‐pass cell with effective optical path length of 6.3 m and small volume of 15 ml is designed to achieve the system response time of 40 s. The dissolved CO2 sensing system has been used in deep sea natural gas hydrate detection.
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.33450