Abstract
A ring laser temperature sensor based on a novel reflective fiber Fabry–Perot (F–P) interferometer air cavity is proposed and experimentally demonstrated. The reflective F–P air cavity, which consists of a segment of glass capillary inserted between two single–mode fibers, is utilized as a sensing element as well as as a filter in the fiber ring cavity. As temperature increases, the reflection spectra of the F–P sensor move towards the longer wavelength, and then cause lasing wavelength shifts. By monitoring the variation of lasing wavelength, we obtain a temperature sensor system with a high temperature sensitivity of 0.249 nm °C−1, a narrow 3 dB bandwidth of 0.1514 nm, and a high signal-to-noise ratio of 52 dB. Moreover, it is convenient to fabricate the sensor head, and the stability is very good, giving it a wide range of applications.
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