4.7 Article

Wavelength modulation spectroscopy of oxygen inside anti-resonant hollow-core fiber-based gas cell

期刊

OPTICS AND LASER TECHNOLOGY
卷 170, 期 -, 页码 -

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ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2023.110323

关键词

Gas detection; Oxygen; Methane; Wavelength modulation spectroscopy; Hollow-core fiber All-fiber sensors

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This paper investigates the optical detection of oxygen in the A-band using tunable laser diode spectroscopy and explores the use of hollow-core optical fibers as an alternative to conventional gas absorption cells. The research presents a convenient, robust, and scalable all-fiber setup using a silica anti-resonant hollow-core fiber. The results show successful absorption spectra recording and detection limit achievement for oxygen, as well as the versatility of the sensing approach in simultaneously detecting oxygen and methane.
Optical detection of oxygen in A-band (near 13140 cm-1 or 761 nm) with tunable laser diode spectroscopy has been investigated and demonstrated in the past. However, as the demand for miniaturization of gas sensors increases, the hollow-core optical fibers emerge as a promising alternative to conventional large-volume gas absorption cells. In this paper we present a highly convenient, robust and scalable all-fiber setup that utilizes a 1.2 m silica anti-resonant hollow-core fiber as a small-footprint gas cell. Using tunable laser diode, the absorption spectra of oxygen in range from 13133.44 to 13148.12 cm-1 have been recorded. We also performed wavelength modulation spectroscopy of oxygen for samples with various oxygen concentrations and achieved a detection limit of approximately 170 ppm for an averaging time of 5 s. Furthermore, the versatility of the sensing approach is demonstrated by showing its ability to simultaneously detect oxygen at 761 nm and methane at 1651 nm inside the same hollow-core fiber.

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