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Highly sensitive methane detection using a mid-infrared interband cascade laser and an anti-resonant hollow-core fiber

Autor
PYSZ, DARIUSZ
Nikodem, Michal
Klimczak, Mariusz
BUCZYŃSKI, RYSZARD
Stępniewski, Grzegorz
Gomółka, Grzegorz
Data publikacji
2023
Abstrakt (EN)

For over a decade hollow-core fibers have been used in optical gas sensors in the role of gas cells. However, very few examples of actual real-life applications of those sensors have been demonstrated so far. In this paper, we present a highly-sensitive hollow-core fiber based methane sensor. Mid-infrared distributed feedback interband cascade laser operating near 3.27 µm is used to detect gas inside anti-resonant hollow-core fiber. R(3) line near 3057.71 cm−1 located in ν3 band of methane is targeted. Compact, lens-free optical setup with an all-silica negative curvature hollow-core fiber as the gas cell is demonstrated. Using wavelength modulation spectroscopy and 7.5-m-long fiber the detection limit as low as 1.54 ppbv (at 20 s) is obtained. The demonstrated system is applied for a week-long continuous monitoring of ambient methane and water vapor in atmospheric air at ground level. Diurnal cycles in methane concentrations are observed, what proves the sensor’s usability in environmental monitoring.

Dyscyplina PBN
nauki fizyczne
Czasopismo
Optics Express
Tom
31
Zeszyt
3
Strony od-do
3685
ISSN
1094-4087
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