An all-fiber Fabry-Perot interferometric sensor is demonstrated both theoretically and experimentally. The proposed structure is designed and fabricated by chemical etching combined with arc discharge welding and tapering. The single-mode fiber (SMF-28) with one end face flattened is inserted vertically into the hydrofluoric acid, then welded with another SMF-28 by arc discharge, to form a bubble by welding and tapering, which exhibits a three-beam interference phenomenon. High-temperature sensitivity of 12.88 pm/°C is obtained at the large temperature range from 50 to 300 °C, with excellent linearity of 0.9956. The Fabry-Perot Interferometer , with low processing cost and high performance, can provide a useful application in temperature sensing prospects.
The fabrication process and temperature and strain characterizations of an all-fiber sensor are presented. The sensing structure based on a Fabry–Perot cavity (FPC) and sagnac loops was proposed and experimentally demonstrated for measurements of temperature and strain. The FPC consists of a micropiece of chemical etched multimode fiber end face, welded with another single mode fiber. Then, the sagnac loops composed of polarization maintaining fiber was connected to the FPC. The sensor was fabricated and tested for temperature and strain. Experimental results show that sensitivity of temperature and strain is 0.71 ± 0.03 nm / ° C and 1.30 ± 0.01 pm / μϵ, respectively; the linearity are 0.9970 and 0.9996, respectively.
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