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Proceedings Paper

Correction of gas concentration based on tunable diode laser absorption spectroscopy in different temperatures
Author(s): Ziqi Qu; Shiling Zhang; Yuxin Xu; Meng Jiang; Junlong Wang
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Paper Abstract

Tunable diode laser absorption spectroscopy (TDLAS) is often used to detect the industrial processing gas component, but the concentration measurement in the field is easily affected by the surrounding temperature. Firstly, the effect of temperature on absorption spectrum was analyzed. Taking methane as an example, DFB laser with 1654nm was used to collect the concentration under temperature from 253K to 323K (with the interval of 10K for each point) based on WMS method. The results showed that the maximum relative error was 25%. Based on the experimental data, the correction formula of second harmonic full waveform was fitted, and the gas detection system with temperature compensation was constructed at the same time. The experimental results illustrated that the maximum relative error under the same test conditions was reduced to less than 5%, and the detection accuracy were significantly improved under variable temperature environment, which provided the guarantee for TDLAS online monitoring and broadened the use scenario of the technology.

Paper Details

Date Published: 10 May 2019
PDF: 6 pages
Proc. SPIE 11068, Second Symposium on Novel Technology of X-Ray Imaging, 110681O (10 May 2019); doi: 10.1117/12.2524587
Show Author Affiliations
Ziqi Qu, Beijing Institute of Aerospace Control Devices (China)
Shiling Zhang, State Grid Chongqing Electric Power Co. (China)
Yuxin Xu, Beijing Institute of Aerospace Control Devices (China)
Meng Jiang, Beijing Institute of Aerospace Control Devices (China)
Junlong Wang, Beijing Institute of Aerospace Control Devices (China)


Published in SPIE Proceedings Vol. 11068:
Second Symposium on Novel Technology of X-Ray Imaging
Yangchao Tian; Tiqiao Xiao; Peng Liu, Editor(s)

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