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Chin. Opt. Lett.
 Home  List of Issues    Issue 06 , Vol. 06 , 2008    An approach of open-path gas sensor based on tunable diode laser absorption spectroscopy


An approach of open-path gas sensor based on tunable diode laser absorption spectroscopy
Hui Xia, Wenqing Liu, Yujun Zhang, Ruifeng Kan, Min Wang, Ying He, Yiben Cui, Jun Ruan, Hui Geng
Key Laboratory of Environmental Optics and Technology, [Anhui Institute of Optics and Fine Mechanics], Chinese Academy of Sciences, Hefei 230031

Chin. Opt. Lett., 2008, 06(06): pp.437-440-4

DOI:
Topic:Spectroscopy
Keywords(OCIS Code): 300.6340  280.0280  300.6260  300.6380  

Abstract
Tunable diode laser absorption spectroscopy (TDLAS) is a new method to detect trace-gas qualitatively or quantificationally based on the scan characteristic of the diode laser to obtain the absorption spectroscopy in the characteristic absorption region. A time-sharing scanning open-path TDLAS system using two near infrared distributed feedback (DFB) tunable diode lasers is designed to detect CH4 and H2S in leakage of natural gas. A low-cost Fresnel lens is used in this system as receiving optics which receives the laser beam reflected by a solid corner cube reflector with a distance of up to about 60 m. High sensitivity is achieved by means of wavelength-modulation spectroscopy with second-harmonic detection. The minimum detection limits of 1.1 ppm.m for CH4 and 15 ppm.m for H2S are demonstrated with a total optical path of 120 m. The simulation monitoring experiment of nature gas leakage was carried out with this system. According to the receiving light efficiency of optical system and detectable minimum light intensity of detection, the detectable optical path of the system can achieve 1-2 km. The sensor is suitable for natural gas leakage monitoring application.

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Received:2007/9/13
Accepted:
Posted online:

Get Citation: Hui Xia, Wenqing Liu, Yujun Zhang, Ruifeng Kan, Min Wang, Ying He, Yiben Cui, Jun Ruan, Hui Geng, "An approach of open-path gas sensor based on tunable diode laser absorption spectroscopy," Chin. Opt. Lett. 06(06), 437-440-4(2008)

Note: This work was supported by the Knowledge Innovation Program of Chinese Academy of Sciences (No.KJCX2-SW-W27) and the National Natural Science Foundation of China (No.50534050). H. Xia's e-mail address is hxia@aiofm.ac.cn.



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