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Chinese Optics Letters

Chinese Optics Letters


  • Vol. 8, Iss. 3 — Mar. 1, 2010
  • pp: 266–269

Polymer diaphragm based sensitive fiber optic Fabry-Perot acoustic sensor

Qiaoyun Wang and Qingxu Yu  »View Author Affiliations

Chinese Optics Letters, Vol. 8, Issue 3, pp. 266-269 (2010)

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A sensitive polymer diaphragm based fiber Fabry-Perot (F-P) sensor for aeroacoustic wave measurement is presented. A novel polymer material poly (phthalazinone ether sulfone ketone) (PPESK) diaphragm is used as the acoustic sensing element. The effective dimensions of the diaphragm are 4 mm in diameter and 6 μm in thickness. Owing to the good mechanical and optical features of the diaphragm and application of the interferometric/intensity demodulation, a system sensitivity of 31 mV/Pa is achieved in the frequency range of 0.1-12.7 kHz, and a signal-to-noise ratio (SNR) of 29 dB at 1 kHz is obtained. The linear response of the sensor is from 0.35 to 2.82 Pa, corresponding to 85-103 dB sound pressure level (SPL) (re: 20μ Pa). The sensor has the potential to be used as a universal and low-cost optical microphone.

© 2010 Chinese Optics Letters

OCIS Codes
(050.2230) Diffraction and gratings : Fabry-Perot
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot

Qiaoyun Wang and Qingxu Yu, "Polymer diaphragm based sensitive fiber optic Fabry-Perot acoustic sensor," Chin. Opt. Lett. 8, 266-269 (2010)

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