Compact hollow waveguide mid-infrared gas sensor for simultaneous measurements of ambient CO2 and water vapor

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Compact hollow waveguide mid-infrared gas sensor for simultaneous measurements of ambient CO2 and water vapor. / Wu, Tao; Kong, Weiping; Wang, Mengyu; Wu, Qiang; Chen, Weidong; Ye, Chenwen; Hu, Rongjing; He, Xingdao.

In: Journal of Lightwave Technology, 27.04.2020.

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Wu, Tao ; Kong, Weiping ; Wang, Mengyu ; Wu, Qiang ; Chen, Weidong ; Ye, Chenwen ; Hu, Rongjing ; He, Xingdao. / Compact hollow waveguide mid-infrared gas sensor for simultaneous measurements of ambient CO2 and water vapor. In: Journal of Lightwave Technology. 2020.

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@article{7ade771eb2de4558a6bd36b7c9357d31,
title = "Compact hollow waveguide mid-infrared gas sensor for simultaneous measurements of ambient CO2 and water vapor",
abstract = "A compact, sensitive and stable hollow waveguide (HWG) mid-infrared gas sensor, based on gas absorption lines using wavelength modulation spectroscopy with a second harmonic (WMS-2f) detection scheme, was developed for simultaneous measurements of ambient CO2 and water vapor. Optimization of the laser modulation parameters and pressure parameter in the HWG are performed to improve the strength of the WMS-2f signal and hence the detection limit, where 14.5-time for CO2 and 8.5-time for water vapor improvement in system detection limit is achieved compared to those working at 1atm. The stability of the sensor has been improved significantly by optimizing environmental disturbances, incoupling alignment of the HWG and laser scanning frequency. An Allan variance analysis shows detection limit of the developed sensor of ~ 3 ppmv for CO2 and 0.018 % for water vapor, which correspond to an absorbance of 2.4×10 −5 and 2.7×10 −5 , with a stability time of 160 s, respectively. Ambient CO2 and water vapor measurement have been performed in two days in winter and spring separately. The measurement precision is further improved by applying a Kalman adaptive filter. The HWG gas sensor demonstrates the ability in environmental monitoring and the potential to be used in other areas, such as industrial production and biomedical diagnosis.",
author = "Tao Wu and Weiping Kong and Mengyu Wang and Qiang Wu and Weidong Chen and Chenwen Ye and Rongjing Hu and Xingdao He",
year = "2020",
month = apr,
day = "27",
doi = "10.1109/JLT.2020.2990977",
language = "English",
journal = "Journal of Lightwave Technology",
issn = "0733-8724",
publisher = "IEEE",

}

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TY - JOUR

T1 - Compact hollow waveguide mid-infrared gas sensor for simultaneous measurements of ambient CO2 and water vapor

AU - Wu, Tao

AU - Kong, Weiping

AU - Wang, Mengyu

AU - Wu, Qiang

AU - Chen, Weidong

AU - Ye, Chenwen

AU - Hu, Rongjing

AU - He, Xingdao

PY - 2020/4/27

Y1 - 2020/4/27

N2 - A compact, sensitive and stable hollow waveguide (HWG) mid-infrared gas sensor, based on gas absorption lines using wavelength modulation spectroscopy with a second harmonic (WMS-2f) detection scheme, was developed for simultaneous measurements of ambient CO2 and water vapor. Optimization of the laser modulation parameters and pressure parameter in the HWG are performed to improve the strength of the WMS-2f signal and hence the detection limit, where 14.5-time for CO2 and 8.5-time for water vapor improvement in system detection limit is achieved compared to those working at 1atm. The stability of the sensor has been improved significantly by optimizing environmental disturbances, incoupling alignment of the HWG and laser scanning frequency. An Allan variance analysis shows detection limit of the developed sensor of ~ 3 ppmv for CO2 and 0.018 % for water vapor, which correspond to an absorbance of 2.4×10 −5 and 2.7×10 −5 , with a stability time of 160 s, respectively. Ambient CO2 and water vapor measurement have been performed in two days in winter and spring separately. The measurement precision is further improved by applying a Kalman adaptive filter. The HWG gas sensor demonstrates the ability in environmental monitoring and the potential to be used in other areas, such as industrial production and biomedical diagnosis.

AB - A compact, sensitive and stable hollow waveguide (HWG) mid-infrared gas sensor, based on gas absorption lines using wavelength modulation spectroscopy with a second harmonic (WMS-2f) detection scheme, was developed for simultaneous measurements of ambient CO2 and water vapor. Optimization of the laser modulation parameters and pressure parameter in the HWG are performed to improve the strength of the WMS-2f signal and hence the detection limit, where 14.5-time for CO2 and 8.5-time for water vapor improvement in system detection limit is achieved compared to those working at 1atm. The stability of the sensor has been improved significantly by optimizing environmental disturbances, incoupling alignment of the HWG and laser scanning frequency. An Allan variance analysis shows detection limit of the developed sensor of ~ 3 ppmv for CO2 and 0.018 % for water vapor, which correspond to an absorbance of 2.4×10 −5 and 2.7×10 −5 , with a stability time of 160 s, respectively. Ambient CO2 and water vapor measurement have been performed in two days in winter and spring separately. The measurement precision is further improved by applying a Kalman adaptive filter. The HWG gas sensor demonstrates the ability in environmental monitoring and the potential to be used in other areas, such as industrial production and biomedical diagnosis.

U2 - 10.1109/JLT.2020.2990977

DO - 10.1109/JLT.2020.2990977

M3 - Article

JO - Journal of Lightwave Technology

JF - Journal of Lightwave Technology

SN - 0733-8724

ER -