Compact dual-gas sensor for simultaneous measurement of atmospheric methane, and water vapor using a 3.38 μm antimonide-distributed feedback laser diode.

Author(s) Ma, H.; Sun, M.; Zhan, S.; Zhang, Q.; Zha, S.; Wang, G.; Liu, K.; Yi, M.; Cao, Z.
Journal Spectrochim Acta A Mol Biomol Spectrosc
Date Published 2020 Feb 05

A simple, compact sensor involving a continuous-wave 3.38 μm distributed feedback laser in combination with a novel compact dense-pattern multipass cell was demonstrated for simultaneous measurement of atmospheric methane and water vapor. The calibration-free direct absorption spectroscopy approach was adopted for data generation and processing. Allan deviation analysis indicates that minimum detection limits (1σ) of 11.0 ppb for CH and 100 ppm for HO were achieved with a 1-s integration time at an optimum pressure of 50 Torr. Atmospheric environmental mixing ratios of these two gases were recorded and analyzed. This newly developed mid-infrared dual-gas sensor is very suitable for trace gas sensing in weight-limited unmanned aerial vehicle- or balloon-embedded field observations.

DOI 10.1016/j.saa.2019.117605
ISSN 1873-3557
Citation Spectrochim Acta A Mol Biomol Spectrosc. 2020;226:117605.

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