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      • Graduate Program in Materials Science and Nanotechnology - Master's degree
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      • Bilkent Theses
      • Theses - Graduate Program in Materials Science and Nanotechnology
      • Graduate Program in Materials Science and Nanotechnology - Master's degree
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      Mechanical and optical optimization of a fiber-optic interferometric acoustic sensor

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      Embargo Lift Date: 2016-08-31
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      Author
      Abdelal, Ayşegül
      Advisor
      Dana, Aykutlu
      Date
      2015-08
      Publisher
      Bilkent University
      Language
      English
      Type
      Thesis
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      Abstract
      External cavity Fiber optic interferometric microphones have the potential to operate at the acustic impedance derived noise limit, with a noise oor close to 1uPa=pHz. This can be achieved with careful optimization of both the mechanical and optical properties of such a sensor. We describe models for the acoustic-to-displacement and displacement-to-optical signal transduction in a Fabry-Perot (FP) type interferometric microphone. We present experimental results and nite element calculations to validate the models. Based on the models, requirements to achieve ultimate sensitivity and noise level in a FP microphone are discussed. Demonstration of a microphone with 30 dBA noise foor is presented using partially optimized membrane and interferometer.
      Keywords
      Fabry- Perot interferometer
      Optical microphone
      Acoustic sensor
      Permalink
      http://hdl.handle.net/11693/28949
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      • Graduate Program in Materials Science and Nanotechnology - Master's degree 144
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