Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/43945
Title: Demodulation of diaphragm based acoustic sensor using Sagnac interferometer with stable phase bias
Authors: Ma, J
Yu, Y
Jin, W 
Issue Date: 2015
Publisher: Optical Society of America
Source: Optics express, 2015, v. 23, no. 22, p. 29268-29278 How to cite?
Journal: Optics express 
Abstract: A stable phase demodulation system for diaphragm-based acoustic sensors is reported. The system is based on a modified fiber-optic Sagnac interferometer with a stable quadrature phase bias, which is independent of the parameters of the sensor head. The phase bias is achieved passively by introducing a nonreciprocal frequency shift between the counter-propagating waves, avoiding the use of complicated active servo-control. A 100 nm-thick graphite diaphragm-based acoustic sensor interrogated by the proposed demodulation system demonstrated a minimum detectable pressure level of ~450 μPa/Hz1/2 and an output signal stability of less than 0.35 dB over an 8-hour period. The system may be useful as a universal phase demodulation unit for diaphragm-based acoustic sensors as well as other sensors operating in a reflection mode.
URI: http://hdl.handle.net/10397/43945
EISSN: 1094-4087
DOI: 10.1364/OE.23.029268
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