AUTHORS:

Gronowicz P., Gomółka G., Pysz D., Buczyński R., Nikodem M.

ABSTRACT:

In this study, we demonstrate a compact reflective gas sensing probe based on a negative-curvature hollow-core fiber. The probe’s design simplifies gas detection by eliminating the need for additional tubing, thereby improving the response time of gas sensing with hollow-core fibers. Using tunable diode laser absorption spectroscopy and wavelength modulation spectroscopy, we achieved detection limits of ~1.5ppm for near-infrared methane sensing and below 100 ppb for mid-infrared detection. The probe’s straightforward construction and compact form factor make it suitable for in situ measurements in hard-to-reach locations, offering a practical solution for gas leak detection and environmental monitoring.

Applied Optics, 2025, vol. 64(20), pp. 5624-5631, doi: 10.1364/AO.560251