Dr. Jinduo Wang Profile

Dr. Jinduo Wang

at Science and Technology on Optical Radiation Lab

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Proceedings Article | 20 January 2023 Paper

Study on natural gas leakage detection CRDS device and its baseline correction in ambient atmosphere

Jinduo Wang, Wenbin Xu, Zeqiang Mo, Jianguo He, Yang Liu

Proceedings Volume 12558, 1255808 (2023) https://doi.org/10.1117/12.2647942

KEYWORDS: Methane, Atmospheric corrections, Absorption, Atmospheric sensing, Gases, Spectroscopy, Carbon

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Chinese government advocates a low-carbon development and strives to achieve carbon peak and carbon neutralization. It is an important issue to safely allocate and use of natural gas, which is a relatively clean basic energy and owns a huge consumption demand. In this paper, a sensitive experimental device based on CRDS has been developed to measure natural gas leakage in the ambient atmosphere, while a wavelength scanning baseline correction method is proposed for measurement in multicomponent ambient atmosphere. The minimum Allan deviation of the CRDS device with the laser for CH4 detection reaches 9 × 10-11 cm-1 , corresponding to the NEA of 6.4 × 10-10 cm-1 Hz-1/2. The minimum value of Allan deviation becomes 1.1 × 10-10 cm-1 after replacing the laser for C2H6 detection. The measurement sensitivity of the device for methane and ethane is 0.24 ppbv and 2.44 ppbv respectively. The device is calibrated with 1 ppmv CH4/C2H6 standard gases, and the measurement precision is 4.1/18.6 ppbv respectively. In addition, the concentrations of CH4, H2O and CO2 in the ambient air are measured by the wavelength scanning method, and this method and results can be used to determine the baseline of field measurement in the future.

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