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Opt Express. 2012 Dec 10;20(26):B581-6. doi: 10.1364/OE.20.00B581.

Frequency-domain analysis of dynamically applied strain using sweep-free Brillouin time-domain analyzer and sloped-assisted FBG sensing.

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  • 1Department of Electrical Engineering-Systems, University of Southern California, 3740 McClintock Avenue, Los Angeles, CA 90035, USA.


Fast reconstruction of the whole Brillouin gain spectrum is experimentally demonstrated using sweep-free Brillouin optical time-domain analysis (SF-BOTDA). Strain variations with the frequencies up to 400 Hz are spectrally analyzed, achieving strain sensitivity of 1 microstrain per root Hz at a sampling rate of 5.5 kHz and a spatial resolution of 4m. The results favorably compare with fiber Bragg grating sensing.

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