Optoelectronics Letters, Volume. 11, Issue 4, 298(2015)

A mid-infrared methane detection device based on dualchannel lock-in amplifier

Ling-jiao ZHENG1, Kai-yuan ZHENG1, Chuan-tao ZHENG1、*, Yue ZHENG1, Mei-mei CHEN2, and Yi-ding WANG1
Author Affiliations
  • 1State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University,Changchun 130012, China
  • 2College of Communication Engineering, Jilin University, Changchun 130012, China
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    A portable dual-channel digital/analogue hybrid lock-in amplifier (LIA) is developed, and its amplitude detection error is less than 10% when the signal-to-noise ratio (SNR) is larger than -12 dB. Then, a differential mid-infrared methane (CH4) detection device is experimentally demonstrated based on a wideband incandescence wire-source and a multi-pass spherical reflector. The experiments are carried out to obtain the sensing performance of the device. With the absorption length of only ~4.8 cm, the limit of detection (LoD) is about 71.43 mg/m3, and the detection range is from 0 mg/m3 to 5.00×104 mg/m3. As the concentration gets larger than 714.30 mg/m3, the relative detection error falls into the range of -5%—+5%. Two seven-hour-measurements are done on the CH4 samples with concentrations of 1.43×103 mg/m3and 4.29×103 mg/m3, respectively, and the results show that the maximum relative error is less than 5%. Because of the cost effective incandescence wire-source, the small-size and inexpensive dual-channel LIA, and the small-size absorption pool and reflector, the developed device shows potential applications of CH4 detection in coal mine production and environmental protection.

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    ZHENG Ling-jiao, ZHENG Kai-yuan, ZHENG Chuan-tao, ZHENG Yue, CHEN Mei-mei, WANG Yi-ding. A mid-infrared methane detection device based on dualchannel lock-in amplifier[J]. Optoelectronics Letters, 2015, 11(4): 298

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    Paper Information

    Received: May. 28, 2015

    Accepted: --

    Published Online: Oct. 12, 2017

    The Author Email: Chuan-tao ZHENG (zhengchuantao@jlu.edu.cn)

    DOI:10.1007/s11801-015-5102-2

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