Study on phase shift auto-balanced laser absorption spectroscopy

SHU Xiao-wen; ZHANG Yu-jun; GENG Hui; ZHANG Shuai; XU Zhen-yu; ZHANG Liang

doi:10.3969/j.issn.1001-3806.2011.05.012

LASER TECHNOLOGY > 2011 > 35(5): 618-621,625. > DOI: 10.3969/j.issn.1001-3806.2011.05.012

SHU Xiao-wen, ZHANG Yu-jun, GENG Hui, ZHANG Shuai, XU Zhen-yu, ZHANG Liang. Study on phase shift auto-balanced laser absorption spectroscopy[J]. LASER TECHNOLOGY, 2011, 35(5): 618-621,625. DOI: 10.3969/j.issn.1001-3806.2011.05.012

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Study on phase shift auto-balanced laser absorption spectroscopy

Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics & Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China

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Received Date: November 01, 2010
Revised Date: February 27, 2011
Published Date: September 24, 2011

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Abstract

Tunable diode laser absorption spectroscopy (TDLAS) is a flexible and well-developed technology used for gas detection in open optical path. In order to improve the detection sensitivity in the direct absorbing method, and solve the adaptation of auto-balanced detection requiring two similar optical paths, a so-called phase shift auto-balanced detection was presented, in which after filtering, amplifying and phase shifting, the absorption signal could be obtained from two optical signals with phase shift difference of 180; and then gas density could be calculated after processing the absorption signal and the direct current indicating the light intensity. The results show that phase shift auto-balanced detection can overcome the disadvantages of the auto-balanced detection for it can not be used in the same optical path. In addition, it is very sensitive to the subtle change of signal and the signal-to-noise ratio is improved greatly, 8~9 times higher than direct detection. The phase shift auto-balanced detection can provide a sensitive and stable approach to detect the long-range gas and may be used in wider areas in the future.
- spectroscopy,
- tunable diode laser absorption spectroscopy,
- phase shift auto-balanced detection,
- gas detection

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