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Proceedings Paper

Online self-calibration technique for trace gas analyzer based on tunable diode laser absorption spectroscopy
Author(s): Yong Zhu; Jun Zhang; Junqing Chen; Chaoyang Zhang; Ke Xie; Wei Wei
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Paper Abstract

To compensate the measurement error induced by temperature and pressure variation in a tunable diode laser absorption spectroscopy (TDLAS) system, an online self-calibration technique is introduced. More specifically, a reference gas cell filled with known proportion target gas is placed on site, surrounded by working gas to be measured. Thereby, the temperature and pressure inside the reference cell are equal to the gas outside. The TDLAS system acquires the absorption spectrum of the reference gas cell and the working gas synchronously. And the concentration of the trace gas in working gas can be easily obtained by calculating the absorption intensity proportion of both absorption spectrums without considering the affection of temperature and pressure. The principle, design, and experiment of this technique are presented in this paper.

Paper Details

Date Published: 2 February 2009
PDF: 8 pages
Proc. SPIE 7160, 2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications, 71602S (2 February 2009); doi: 10.1117/12.807116
Show Author Affiliations
Yong Zhu, Chongqing Univ. (China)
Jun Zhang, Chongqing Sichuan Instrument Complex Co Ltd (China)
Junqing Chen, Chongqing Sichuan Instrument Complex Co Ltd (China)
Chaoyang Zhang, Chongqing Univ. (China)
Ke Xie, Chongqing Univ. (China)
Wei Wei, Chongqing Univ. (China)


Published in SPIE Proceedings Vol. 7160:
2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications
Shenghua Ye; Guangjun Zhang; Jun Ni, Editor(s)

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