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- W768762403 abstract "ABSTRACT A modified fiber-optic Sagnac interferometer with a stable /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/Hz 1/2 at the frequency of 5 kHz and the output signal stability is less than 0.35 dB over an 8-hour period. Keywords: Optical fiber sensor, Sagnac interferomete r, acoustic sensor, graphite diaphragm 1. INTRODUCTION Diaphragm based fiber Fabry-Perot interferometers (FPIs) with a deflectable diaphragm attach ed to a hollow cavity have been investigated extensively for acoustic detection [1-4]. These FPI acoustic sensors are conventionally demodulated by using a narrow-band laser with the wavelength tuned to a quadrature point (Q-point) of the interference spectrum. However, the dependence of the Q-point of a FPI on the cavity-length and the difficulty of the fabrication of fiber FPIs with exactly the same cavity length mean that, for different sensors, the laser wavelength need to be tuned to different values to ensure optimal phase to intensity conversion. Furthermore, the Q-point of the sensors may drift due to fluctuation in ambient temperature and background pressure during operation, causing instability of the demodulation system. Methods such as electrical feedba ck and diffractive grating control have been employed to follow the drift and maintain the Q-point in real time but the active control increases the complexity of the system [5, 6]. In this paper, we report a stable phase demodulation system for diaphragm-based reflection-type acoustic sensors. It is based on a modified Sagnac interferometer which the sensor is incorporated into and functions as part of the Sagnac loop by using an additional fiber directional coupler. Stable phase bias is achieved by inducing a nonreciprocal frequency shift between the two counter-propagating waves in the modified Sagnac interferometer. The system could be used for universal phase demodulation of diaphragm-based acoustic sensors as well as other reflection-type sensors." @default.
- W768762403 created "2016-06-24" @default.
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- W768762403 date "2015-07-01" @default.
- W768762403 modified "2023-09-26" @default.
- W768762403 title "Sagnac interferometer based stable phase demodulation system for diaphragm based acoustic sensor" @default.
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- W768762403 doi "https://doi.org/10.1117/12.2184271" @default.
- W768762403 hasPublicationYear "2015" @default.
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