Title :
A fully distributed simultaneous strain and temperature sensor using spontaneous Brillouin backscatter
Author :
Parker, T.R. ; Farhadiroushan, M. ; Handerek, V.A. ; Roger, A.J.
Author_Institution :
Dept. of Electron. & Electr. Eng., King´s Coll., London, UK
fDate :
7/1/1997 12:00:00 AM
Abstract :
We report here the first simultaneous measurement of strain and temperature using Brillouin backscatter in an optical fiber. A new sensor arrangement is presented which allows the distributed measurement of Brillouin spectra. Simultaneous measurement of spontaneous Brillouin power and Brillouin shift distributions are made from these spectra, and from this information, we obtain fully distributed measurements of strain and temperature. Our sensor achieves a 100-μ/spl epsiv/ strain and 4/spl deg/C temperature resolution, with 40-m spatial resolution, over a sensing length of 1200 m.
Keywords :
Brillouin spectra; backscatter; fibre optic sensors; optical fibres; spectral methods of temperature measurement; strain sensors; temperature sensors; 1200 m; Brillouin shift distributions; distributed measurement; distributed simultaneous strain/temperature sensor; optical fiber; sensing length; spatial resolution; spontaneous Brillouin backscatter; spontaneous Brillouin power; strain measurement; strain resolution; temperature measurement; temperature resolution; Bragg gratings; Brillouin scattering; Capacitive sensors; Frequency measurement; Optical fiber communication; Optical fiber sensors; Power measurement; Strain measurement; Temperature distribution; Temperature sensors;
Journal_Title :
Photonics Technology Letters, IEEE
