Truly Distributed Fiber Vibration Sensor Using Pulse Base BOTDA With Wide Dynamic Range

Cui, Q.; Pamukcu, S.; Xiao, W.; Pervizpour, M.;
Q. Cui is with the Department of Civil and Environmental Engeering, Lehigh Univeristy, Bethlehem, PA 18015 USA.

Photonics Technology Letters, IEEE 
Issue:99
On page(s): 1
Digital Object Identifier :  10.1109/LPT.2011.2170968
Date of Publication :   10 Oct 2011

Abstract
We report on what we believe to be the first truly distributed fiber vibration sensor based on pulse base Brillouin optical time domain analysis (BOTDA). Pulse base approach is used to realize one-end one-laser simplification of BOTDA system, in which the modulated pulse creates the probe wave and interacts with the pulse pump. Short pulse (<10 ns) is used to enhance the dynamic range for the sensed object. Signal acquisition system with 1 GHz sampling rate and 2 kHz trigger rate is employed to measure the truly distributed vibrations along the sensing fiber. With 6.25 ns pulse width, 160 MHz dynamic range is verified and different vibrations with 0, 1.4 and 2.4 Hz frequency components are distinguished in a 168 m sensing range. The experimental results demonstrate that this proposed sensor may be applicable for distributed dynamic measurements ...