Fiber temperature sensor utilizing a thermomechanical MEMS detector


Cirkinoglu H. O. , Bilgin H., Çivitci F. , TORUN H., Ferhanoğlu O.

Conference on Photonic Fiber and Crystal Devices - Advances in Materials and Innovations in Device Applications X, California, Amerika Birleşik Devletleri, 28 - 29 Ağustos 2016, cilt.9958 identifier identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Cilt numarası: 9958
  • Doi Numarası: 10.1117/12.2237134
  • Basıldığı Şehir: California
  • Basıldığı Ülke: Amerika Birleşik Devletleri

Özet

We propose a novel fiber sensor utilizing a the lomechanical 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 foul's 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.