Title :
Research on COTDR for measuring distributed temperature and strain
Author :
Zhi, Yang ; Pengxiang, Shi ; Yongqian, Li
Author_Institution :
Dept. of Electron. & Commun. Eng., North China Electr. Power Univ., Baoding, China
Abstract :
The coherent optical time domain reflectometer (COTDR) based distributed temperature and strain sensing is studied in this paper. The sensing principle is analyzed and discussed in detail. Rayleigh backscattering in a single-mode optical fiber is measured by COTDR with a precisely frequency-controlled light source, and the cross-correlation of the Rayleigh backscattering is calculate to detect the frequency changes of the cross-correlation peak caused by the changes of temperature and strain. We perform simulations on the COTDR based sensing system by computer and draw some conclusions.
Keywords :
Rayleigh scattering; optical time-domain reflectometry; optical variables measurement; reflectometers; strain measurement; strain sensors; temperature measurement; temperature sensors; COTDR based sensing system; Rayleigh backscattering; coherent optical time domain reflectometer; cross-correlation peak; distributed temperature measurement; distributed temperature sensing; frequency change detection; frequency-controlled light source; single-mode optical fiber measurement; strain measurement; strain sensing; Frequency measurement; Optical fiber sensors; Optical fibers; Strain; Temperature measurement; Temperature sensors; Rayleigh scattering; coherent OTDR; distributed fiber sensor; strain measurement; temperature measurement;
Conference_Titel :
Mechanic Automation and Control Engineering (MACE), 2011 Second International Conference on
Conference_Location :
Hohhot
Print_ISBN :
978-1-4244-9436-1
DOI :
10.1109/MACE.2011.5986993
