Slope-assisted complementary-correlation optical time-domain analysis of Brillouin dynamic gratings for high sensitivity, high spatial resolution, fast and distributed fiber strain sensing

A. Bergman; T. Langer; M. Tur

doi:10.1117/12.2185279

1 July 2015 Slope-assisted complementary-correlation optical time-domain analysis of Brillouin dynamic gratings for high sensitivity, high spatial resolution, fast and distributed fiber strain sensing

A. Bergman, T. Langer, M. Tur

Author Affiliations +

Proceedings Volume 9655, Fifth Asia-Pacific Optical Sensors Conference; 96550V (2015) https://doi.org/10.1117/12.2185279
Event: Fifth Asia Pacific Optical Sensors Conference, 2015, Jeju, Korea, Republic of

Abstract

The performance of an optical time-domain sensing technique, employing the slope of Brillouin dynamic gratings in polarization-maintaining fibers, can be significantly enhanced using Golay complementary sequences. The strain sensitivity of the reflectivity of a coded probe primarily depends on the detuning between the orthogonally polarized pumps, which generated the grating. The system broadband sensitivity for a 256 bit unipolar probe code was demonstrated to be 50nε/√Hz at a sampling rate of 2MHz, which to the best of our knowledge is a record sensitivity for Brillouin dynamic sensing. We report the measurement of 10kHz strain vibrations (which is the bandwidth limit of the vibration source) with a spatial resolution of 2cm. Owing to the system high sensitivity and spatial resolution, it has the potential to be used in distributed ultrasonic detection applications.

Citation Download Citation

A. Bergman, T. Langer, and M. Tur "Slope-assisted complementary-correlation optical time-domain analysis of Brillouin dynamic gratings for high sensitivity, high spatial resolution, fast and distributed fiber strain sensing", Proc. SPIE 9655, Fifth Asia-Pacific Optical Sensors Conference, 96550V (1 July 2015); https://doi.org/10.1117/12.2185279

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