A novel mid-infrared hollow waveguide gas sensor for measuring water vapor isotope ratios in the atmosphere

Liu, Yang, Wu, Tao, Wu, Qiang, Chen, Weidong, Ye, Chenwen, Wang, Meng-Yu and He, Xingdao (2023) A novel mid-infrared hollow waveguide gas sensor for measuring water vapor isotope ratios in the atmosphere. Sensors and Actuators B: Chemical, 375. p. 132950. ISSN 0925-4005

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Official URL: https://doi.org/10.1016/j.snb.2022.132950

Abstract

A novel mid-infrared hollow waveguide gas sensor was developed to target H218O, H216O, H217O, and HDO absorption lines at 3662.9196, 3663.04522, 3663.32128, and 3663.84202 cm−1, respectively, based on wavelength modulation spectroscopy using a 2.73 µm distributed feedback diode laser. A hollow waveguide fiber with a 5-m length and 1-mm inner diameter was used for gas absorption. A dew point generator with liquid water with known water–isotope ratios was used to calibrate the sensor. Detection limits of 35.18 ppbv, 4.69 ppmv, 60.53 ppbv, and 3.88 ppbv were obtained for H218O, H216O, H217O, and HDO, respectively, in a 96-s integration time, which resulted in isotopic ratio measurement precision of 0.85‰, 0.57‰, and 10.48‰ for δ18O, δ17O, and δD, respectively. Field measurements of H218O, H216O, and H217O concentration were conducted on the Nanchang Hangkong University campus to evaluate sensor performance.

Item Type: Article
Additional Information: Funding information: The authors acknowledge the support of the National Natural Science Foundation of China (Grant No. 42175130, 61965013, 61865013), the Key Research and Development Program of Jiangxi Province, China (20203BBG73039), the National Key Research and Development Program of China (No. 2018YFE0115700) and Postgraduate Innovation Foundation of Nanchang Hangkong University (YC2020078).
Uncontrolled Keywords: Hollow waveguide, Gas sensor, Wavelength modulation spectroscopy, Water vapor–isotope ratio
Subjects: H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Elena Carlaw
Date Deposited: 04 Nov 2022 14:11
Last Modified: 25 Nov 2022 15:15
URI: https://nrl.northumbria.ac.uk/id/eprint/50540

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