Title :
Time-Domain Distributed Fiber Sensor With 1 cm Spatial Resolution Based on Brillouin Dynamic Grating
Author :
Song, Kwang Yong ; Chin, Sanghoon ; Primerov, Nikolay ; Thévenaz, Luc
Author_Institution :
Inst. of Electr. Eng., Ecole Polytech. Fed. de Laussane, Lausanne, Switzerland
fDate :
7/15/2010 12:00:00 AM
Abstract :
We demonstrate an optical time-domain distributed fiber sensor showing the highest spatial resolution ever reported based on Brillouin dynamic grating in a polarization-maintaining fiber. In our scheme, the acoustic gratings containing the information on the local Brillouin frequency are generated by a long pump pulse in one polarization, and read out by a short probe pulse in the orthogonal polarization at a clearly distinct optical frequency from the pump. In the experiment, distributed temperature measurements over a 20 m fiber are performed with 1.2 cm spatial resolution.
Keywords :
Brillouin spectra; diffraction gratings; fibre optic sensors; optical fibre polarisation; temperature measurement; Brillouin dynamic grating; acoustic grating; distance 20 m; distributed temperature measurement; high spatial resolution; local Brillouin frequency; long pump pulse; orthogonal polarization; polarization maintaining fiber; short probe pulse; time domain distributed fiber sensor; Brillouin scattering; gratings; optical fiber measurements; optical fibers;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2010.2050763
