Pseudoheterodyne signal processing scheme for interrogation of fiber Bragg grating sensor arrays

Clare K. Chatterjea; Stephen W. James; Ralph P. Tatam

doi:10.1117/12.312945

30 June 1998 Pseudoheterodyne signal processing scheme for interrogation of fiber Bragg grating sensor arrays

Clare K. Chatterjea, Stephen W. James, Ralph P. Tatam

Proceedings Volume 3478, Laser Interferometry IX: Techniques and Analysis; (1998) https://doi.org/10.1117/12.312945
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

An intensity-based interrogation technique for arrays of fiber bragg grating (FBG) sensors is reported. The technique is based upon each FBG forming one mirror of a Michelson interferometer. Source wavelength modulation is combined with an unbalanced interferometer to produce a carrier signal. Carrier frequencies are characteristic of the optical path length imbalance and hence grating position within the array. The intensity of the carrier signal is directly related to the optical power reflected from the grating and hence the strain applied to the grating. Strain resolution of approximately 3 micrometers /m is demonstrated with an approximately 350micrometers /m sensor range. Multiplexing is demonstrated and techniques to extend the range are discussed.

Citation Download Citation

Clare K. Chatterjea, Stephen W. James, and Ralph P. Tatam "Pseudoheterodyne signal processing scheme for interrogation of fiber Bragg grating sensor arrays", Proc. SPIE 3478, Laser Interferometry IX: Techniques and Analysis, (30 June 1998); https://doi.org/10.1117/12.312945

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