TY - JOUR
T1 - A novel mid-infrared hollow waveguide gas sensor for measuring water vapor isotope ratios in the atmosphere
AU - Liu, Yang
AU - Wu, Tao
AU - Wu, Qiang
AU - Chen, Weidong
AU - Ye, Chenwen
AU - Wang, Meng-Yu
AU - He, Xingdao
N1 - 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).
PY - 2023/1/15
Y1 - 2023/1/15
N2 - 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.
AB - 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.
KW - Hollow waveguide
KW - Gas sensor
KW - Wavelength modulation spectroscopy
KW - Water vapor–isotope ratio
U2 - 10.1016/j.snb.2022.132950
DO - 10.1016/j.snb.2022.132950
M3 - Article
SN - 0925-4005
VL - 375
JO - Sensors and Actuators B: Chemical
JF - Sensors and Actuators B: Chemical
M1 - 132950
ER -