Self-mixing-based demodulation technique for dynamic fiber Bragg grating strain sensors


We report a novel demodulation scheme for the detection of small Bragg wavelength shifts in a fiber Bragg grating strain sensor by exploiting the optical feedback reflected from the grating structure back into a 1310 nm laser diode integrating a photodiode. The dynamic strain generated by a mechanical vibrator is applied transversely to the fiber Bragg grating and the desired longitudinal strain values inferred from the detected sawtooth-like optical feedback signals. Preliminary results demonstrate the feasibility of this demodulation technique for strain measurement which could be further extended to fiber Bragg grating-based sensors for the detection of different measurands in general.

Additional Information: Instrumentation and Measurement Technology Conference, 2006 (IMTC 2006), 24-27 April 2006, Sorrento (IT).
Uncontrolled Keywords: Fiber Bragg grating sensor, dynamic strain measurement, optical feedback interferometry, self-mixing
ISBN: 0780393597
Last Modified: 23 Oct 2019 11:30
Date Deposited: 09 May 2011 11:39
Published Date: 2006-04-24
Authors: Seat, H.C.
Wang, Y.
Hu, W.
Bosch, T.
Chen, Xianfeng F.
Zhang, Lin


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