Journal
OPTICS AND LASERS IN ENGINEERING
Volume 123, Issue -, Pages 1-7Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2019.06.024
Keywords
Carbon monoxide; Methane; Laser sensors; Wavelength modulation spectroscopy (WMS); Optical instruments
Categories
Funding
- National Natural Science Foundation of China [31801259]
- National Key R&D Program of China [2016YFD0700101]
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A compact open-path sensor for simultaneous atmospheric pressure detection of trace gases carbon monoxide (CO) and methane (CH4) has been developed by using a single-mode, distribution feedback (DFB) laser operating at similar to 2.33 mu m. A novel spectral interference eliminating approach based on second harmonic wavelength modulation spectroscopy (WMS) detection technique and an approximation method was adopted to solve the problem of interference between adjacent spectral absorption lines at atmospheric pressure and to increase the detection sensitivity and resolution. The relative concentration error of CO was calculated to be less than +/-3.17%, and the detection limit of 0.58 parts per million by volume (ppmv) for CO and 0.4 ppmv for CH4 was achieved at 1-s averaging time, which proves the effectiveness of the proposed approach. A one-week field continuous measurement was performed to demonstrate the stability of the reported sensor system.
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