Mid‐infrared dissolved CO2 measurement system using the ultra‐compact multipass cell. Issue 5 (11th September 2022)

• Record Type: Journal Article
• Authors: Chen, Hongda; Chen, Chen; Dong, Weihao; Li, Yongyang; Zhang, Mengru
• Other Names: Ma Yufei guestEditor.; Kan Ruifeng guestEditor.; Mei Liang guestEditor.; Ma Weiguang guestEditor.
• Is Part Of: Microwave and optical technology letters. Volume 65:Issue 5(2023)
• Page Start: 1319
• Page End: 1323
• Publication Date: 2022-09-11
• Subjects: 1f+ 3f WMS -- fast response time -- limit of detection -- multipass cell -- multiplexing multiple spectral lines; Microwaves -- Periodicals; Optics -- Periodicals; 621
• DOI: 10.1002/mop.33450
• Languages: English
• ISSNs: 0895-2477

Abstract

Abstract: 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 12 CO2 and 13 CO2 for isotope measurement and wide range of concentration detection. The optimized 3 f + 1 f 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.