In this paper, the scheme for both reproducing vibration waveform and locating disturbed places in the OTDR based distributed optical fiber vibration sensing systems is proposed and demonstrated. Based on the sampling law, the vibration waveform is reproduced from the detecting pulses including original sensing signals by denoising selectively, adjusting bias voltage and band-pass filtering. The vibrations at the frequencies of 500Hz and 1000Hz have been experimentally located and reproduced, respectively, and the highest frequency of 1 kHz for reproducing vibration waveform is realized at the repeat frequency of 2 kHz for the laser.

Date Published: 31 January 2014
PDF: 6 pages
Proc. SPIE 8993, Quantum Sensing and Nanophotonic Devices XI, 89931P (31 January 2014); doi: 10.1117/12.2041143

Published in SPIE Proceedings Vol. 8993:
Quantum Sensing and Nanophotonic Devices XI
Manijeh Razeghi; Eric Tournié; Gail J. Brown, Editor(s)