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Interferometric time division FBG interrogator and multiplexer with static, dynamic, and absolute wavelength measurement capabilities

Orr, Philip and Paterson, Alan and Niewczas, Pawel (2012) Interferometric time division FBG interrogator and multiplexer with static, dynamic, and absolute wavelength measurement capabilities. In: SPIE Proceedings Vol. 8421. SPIE--The International Society for Optical Engineering.. ISBN 9780819491039

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Abstract

We report on the design and preliminary testing of an interferometric interrogator capable of large-scale time-division multiplexing of FBG sensors. The scheme employs a passive algorithm for phase demodulation, allowing changes in FBG sensor reflected wavelengths to be calculated instantaneously upon arrival, and incorporates a technique for identification of initial absolute sensor wavelengths in order to overcome the measurement ambiguity associated with interferometric schemes. The proposed system will allow for high-speed interrogation of large-scale FBG sensor arrays with interferometric resolution and the capability for dynamic, static, and absolute FBG wavelength measurement.