Fiber-cavity ring-down temperature sensor using a transmissive configuration combined with the heterodyne detection technique.

A fiber Bragg grating temperature sensor based on the cavity ring-down technique is reported. A quasi-linear fiber cavity is proposed to reduce optical loss in the cavity instead of a conventional fiber-loop configuration. The heterodyne detection technique is applied to sensitively detect weak pulses from the cavity. A combination of the quasi-linear fiber cavity and heterodyne detection allows the sensitive detection of the decaying pulse trains and high-resolution measurement of the wavelength shift of the Bragg grating induced by the temperature change. A temperature resolution of about 0.01°C is achieved.

Citation

Keiji Kuroda, Taiki Ikeguchi, Hisaki Oka. Fiber-cavity ring-down temperature sensor using a transmissive configuration combined with the heterodyne detection technique. Applied optics. 2024 Jan 20;63(3):676-680

PMID: 38294379

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