Abstract
We present a novel fiber tip thermometer based on a compact fiber interferometer structure. The sensor tip is formed by splicing the end of two abreast conventional single-mode fibers (SMFs) together, one SMF as the lead-in fiber and the other as the lead-out fiber. Through controlling the splicing parameters, a series of sensor tips with different shapes were made. Due to fiber end enlargement induced by discharge, the coupling occurs between two parallel fiber cores. In addition, the light reflected by the fused end face can be coupled back the fiber core, where the core-core coupling light interfere with the reflected light. Therefore, the different optical paths of the lights form a modal interferometer. A sensor prototype is fabricated and temperature sensing is realized by measuring the wavelength shift of the resonance dips in the reflection spectrum. In the temperature range of 60 °C-300 °C, the corresponding temperature sensitivities are 11 and 10.93 pm/°C for the heating and cooling processes, respectively. Considering that the wavelength resolution of the optical spectrum analyzer is 20 pm, the resolution of the temperature measurement is estimated to be 1.8 °C. Because of its compactness, ease of fabrication, good sensitivity, easy connectivity to other in-fiber optical components, and low cost, this thermometer could find various applications in temperature sensing.
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