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

fYear

2011

fDate

15-17 July 2011

Firstpage

590

Lastpage

593

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Mechanic Automation and Control Engineering (MACE), 2011 Second International Conference on

Conference_Location

Hohhot

Print_ISBN

978-1-4244-9436-1

Type

conf

DOI

10.1109/MACE.2011.5986993

Filename

5986993