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7 September 2016 Fiber temperature sensor utilizing a thermomechanical MEMS detector
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We propose a novel fiber sensor utilizing a thermomechanical MEMS element at the fiber tip. Owing to its Parylene/Titanium bimaterial structure, the MEMS membrane exhibits an out-of plane displacement with changing temperature. Together with the MEMS element, the embedded diffraction grating forms an in-line interferometer, from which the displacement as well as the temperature can be deduced. The fabricated detector is placed at the single-mode fiber output that is collimated via a graded index lens. This novel architecture allows for integrating MEMS detectors on standard optical fibers, and easy substitution of the MEMS detector element to alter the measurement range and the response time of the sensor.Temperature and time-constant measurements are provided and verified with reference measurements, revealing better than 20 mK temperature sensitivity and 2.5 msec response time, using low-cost laser source and photodetectors.
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H. Ozan Çirkinoğlu, Habib Bilgin, Fehmi Çivitci, Hamdi Torun, and Onur Ferhanoğlu "Fiber temperature sensor utilizing a thermomechanical MEMS detector", Proc. SPIE 9958, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications X, 995813 (7 September 2016);

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