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Title: Sagnac interferometer based stable phase demodulation system for diaphragm based acoustic sensor
Authors: Ma, J
Yu, Y
Jin, W 
Keywords: Acoustic sensor
Graphite diaphragm
Optical fiber sensor
Sagnac interferometer
Issue Date: 2015
Publisher: SPIE-International Society for Optical Engineering
Source: Proceedings of SPIE : the International Society for Optical Engineering, 2015, v. 9655, 96550D How to cite?
Journal: Proceedings of SPIE : the International Society for Optical Engineering 
Abstract: A modified fiber-optic Sagnac interferometer with a stable π/2 phase bias is demonstrated for the demodulation of diaphragm-based acoustic sensors. The phase bias is obtained by introducing a nonreciprocal frequency shift between the counter-propagating waves. The system is passive and without complicated servo-control for phase stabilization. Interrogated by the proposed demodulation system, a 100 nm-thick graphite diaphragm-based acoustic sensor demonstrated a minimum detectable pressure level of ∼ 450 μPa/Hz1/2at the frequency of 5 kHz and the output signal stability is less than 0.35 dB over an 8-hour period.
Description: 5th Asia-Pacific Optical Sensors Conference, APOS 2015, 20-22 May 2015
ISBN: 9781628418651
ISSN: 0277-786X
EISSN: 1996-756X
DOI: 10.1117/12.2184271
Appears in Collections:Conference Paper

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