Xu, Ming Gang, Geiger, Harald, Archambault, Jean-Luc, Reekie, Laurence and Dakin, John P.,
Novel frequency-agile interrogating system for fibre Bragg grating sensors
Kersey, Alan D. and Dakin, John P. (eds.)
In Distributed and Multiplexed Fiber Optic Sensors III.
The International Society for Optical Engineering., .
Full text not available from this repository.
We have demonstrated a new frequency-agile system for the interrogation of in-fibre Bragg grating sensors. The scheme involves frequency shift keying (FSK) of the RF drive to an acousto-optic tunable filter (AOTF) to track the wavelength shifts of a Bragg grating. Theoretical studies to derive the optimum frequency deviation for achieving maximum sensitivity are given, and experimental results are presented for temperature measurement. This technique is capable of rapid, random access and very wide tuning range, showing the potential for interrogating multiplexed arrays of Bragg-grating-based sensors
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