Infrared and Laser Engineering, Volume. 46, Issue 9, 917009(2017)
Multi-point full range monitoring of methane based on TDLAS technology
Methane is a dangerous gas for humans and ambience, and methane gas leak detection is especially significant in colliery, petrochemical, gas tank zone, gas station as well as any other safe fields. The fundamental of Tunable Diode Laser Absorption Spectroscopy(TDLAS) was introduced, the center wavelength at 1 653.72 nm was selected for the absorption of methane detection. Also, a 14 cm optical path reflection cell with micro-lenses was designed. The on-line detection system was tested with the 0-100% methane. And also, it can be used to monitor different positions with a beam splitter. In order to improve the signal-noise ratio(SNR), wavelet transform was used to reduce noise of absorption signals. The detection limit was 335 ppm(1 ppm=10-6). A comparison results between the homemade multi-point full-range laser methane sensor and the commercial infrared gas detector were proved that the system has many advantages to meet the requirements of the majority of industry monitoring, such as: the good stability, full range, fast response, calibration free, safe latent, anti-electric magnetic interference, low cost etc.
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Li Zhe, Zhang Zhirong, Sun Pengshuai, Xia Hua, Luo Yuanmin, Pang Tao, Dong Fengzhong. Multi-point full range monitoring of methane based on TDLAS technology[J]. Infrared and Laser Engineering, 2017, 46(9): 917009
Category: 光电测量
Received: Jan. 10, 2017
Accepted: Feb. 20, 2017
Published Online: Nov. 17, 2017
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