Journal
INFRARED PHYSICS & TECHNOLOGY
Volume 71, Issue -, Pages 339-346Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.infrared.2015.05.013
Keywords
Spectroscopy; Mid-infrared; Gas detection; Lock-in amplifier
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Funding
- National Natural Science Foundation of China [61307124, 51305247]
- Changchun Municipal Science and Technology Bureau [14KG022]
- Foundation for Distinguished Young Talents in Higher Education of Guangdong [2013LYM_0030]
- Scientific Research Foundation Project of Shantou University [NTF12022]
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A portable dual-channel digital/analogue hybrid lock-in amplifier (LIA) was developed, and its amplitude detection error is less than 10% when the signal-to-noise ratio is larger than 12 dB. Then, a differential mid-infrared methane detection device was experimentally demonstrated based on a wideband incandescence wire-source and a multi-pass spherical reflector. Detailed detection principle was described, and key modules including the optical part and the electrical part were designed and fabricated. Detailed experiments were carried out to obtain the device's sensing performances. With the absorption length of only similar to 4.8 cm, the limit of detection (LoD) is about 100 ppm within the detection range of 0-70 k ppm. As the concentration gets larger than 1 k ppm, the relative detection error falls into the range of -5% similar to +5%. Based on two seven-hour-measurements on the 2 k and 6 k ppm methane samples, the maximum absolute 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 standalone device shows potential applications of methane detection in coal mine production and environmental protection. (C) 2015 Elsevier B.V. All rights reserved.
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