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发表刊物：
Optics EXPRESS
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是否译文：
否
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发表时间：
2022-07-01
摘要：
We report a high-resolution and wide-range thermometer using a fiber Bragg grating
Fabry–Perot cavity (FBG-FP) combined with beat frequency interrogation. Two distributed
feedback (DFB) lasers are locked to the FBG-FP sensing head and a hydrogen cyanide H13C
14N
(HCN) gas cell, respectively, both using the Pound-Drever-Hall (PDH) technique. The light
beams from two lasers are brought together to interfere on a photodetector producing a beat
frequency signal which provides a measure of the temperature change. Our sensor exhibits a
dynamic range of ∼109 °C, a high resolution of 2×10谸4 °C with an averaging time of 1 s. By
introducing the reference frequency, the sensor has demonstrated good long-term stability. This
sensor provides a useful tool for those fields where resolving slight temperature changes is crucial,
such as deep ocean temperature measurement.
