Title :
A calibrated 27-km distributed fiber temperature sensor based on microwave heterodyne detection of spontaneous Brillouin backscattered power
Author :
Maughan, Sally M. ; Kee, Huai H. ; Newson, Trevor P.
Author_Institution :
Optoelectron. Res. Centre, Southampton Univ., UK
fDate :
5/1/2001 12:00:00 AM
Abstract :
Single-ended distributed fiber temperature measurements using the novel technique of microwave (11 GHz) coherent detection of spontaneous Brillouin backscattered power are presented. Anti-Stokes power traces mere obtained for a sensing length of 27.4 km, believed to be the longest yet demonstrated for such spontaneous power measurements. The power dependence on temperature was measured as 0.36/spl plusmn/0.04%/K, and the rms temperature error was less than 3.5 K at the far end of the sensing fiber.
Keywords :
Brillouin spectra; backscatter; calibration; fibre optic sensors; heterodyne detection; measurement errors; temperature measurement; temperature sensors; 11 GHz; 27 km; 27.4 km; anti-Stokes power traces; calibrated distributed fiber temperature sensor; microwave coherent detection; microwave heterodyne detection; power dependence; rms temperature error; sensing fiber; sensing length; single-ended distributed fiber temperature measurements; spontaneous Brillouin backscattered power; spontaneous power measurements; Backscatter; Brillouin scattering; Optical fiber sensors; Optical filters; Optical mixing; Optical scattering; Optical sensors; Power measurement; Temperature measurement; Temperature sensors;
Journal_Title :
Photonics Technology Letters, IEEE
