Real time and simultaneous measurement of displacement and temperature using fiber loop with polymer coating and fiber Bragg grating.

An all-fiber sensor scheme for real time and simultaneous displacement and temperature measurement is presented and demonstrated. The sensor head is formed by cascading a fiber loop with polymer coating with a fiber Bragg grating. The compatibility of the two components is fully utilized. A sensor resolution of 0.14314 V/μm in displacement and 0.00795 nm/°C in temperature are experimentally achieved within a displacement range of 0-50 μm and a temperature range of 20 °C-75 °C, respectively. The fiber loop with the protection of polymer coating is mechanically reliable, which means the sensor head also suits measuring dynamic displacement. A 500 Hz mechanical micro-vibration is successfully measured by the proposed sensor experimentally. In the last part, we perform a test making the sensor reach its maximum deformation and find the surviving sensor still possesses the same responsiveness as before.

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