Abstract
A vehicle-mounted mobile mid-infrared dual-gas sensor system for simultaneous detection of methane (CH<sub>4</sub>) and ethane (C<sub>2</sub>H<sub>6</sub>) was developed using two interband cascade lasers (ICLs) for targeting the absorption line of CH<sub>4</sub> at 3038.5 cm<sup>-1</sup> and the line of C<sub>2</sub>H<sub>6</sub> at 2996.88 cm<sup>-1</sup>, respectively. Two multi-pass gas cells (MPGCs) with an absorption path length of 26.4 m were utilized. The detection limit (1σ) of CH<sub>4</sub> using wavelength modulation spectroscopy (WMS) is ~ 4.1 parts-per-billion by volume (ppbv) with a 0.5 s averaging time, and the detection limit (1σ) of C<sub>2</sub>H<sub>6</sub> is ~ 2.9 ppbv with a 0.5 s averaging time. Vehicle-mounted mobile measurement ability of the dual-gas sensor was enabled by a remote monitoring system based on an embedded Linux processor and a cloud server. Atmospheric CH<sub>4</sub> and C<sub>2</sub>H<sub>6</sub> monitoring was performed for 48 hours on the Jilin University campus to evaluate the performance of the sensor system. Vehicle-mounted mobile campaigns were carried out both on the Jilin University campus and in the Changchun Area for dual-gas concentration mapping. The sensor system shows the merits of remote monitoring and mobile gas sensing ability in field applications.
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