Coherent OTDR for Measuring Distributed Temperature and Strain with High Resolution in km-long Fiber

Author

Li, Yongqian ; Li, Rongwei ; Yang, Zhi

Author_Institution

Dept. of Electron. & Commun. Eng., North China Electr. Power Univ., Baoding, China

Volume

1

fYear

2010

fDate

11-12 May 2010

Firstpage

962

Lastpage

965

Abstract

We researched a typical coherent optical time domain reflectometry system in which Rayleigh backscattering in a single-mode optical fiber was measured by coherent OTDR employing with a precisely frequency-controlled light source. The system can measure distributed temperature and strain with a resolution of 0.01°C and a spatial resolution of 1 m in km-long fiber. Our simulation confirmed that the COTDR system enables us to measure distributed temperature and strain with high resolution. Backscattered power from the sensing fiber was measured and processed in simulation. This temperature resolution is two orders of magnitude better than that provided by the conventional BOTDR system.

Keywords

optical fibres; optical variables measurement; reflectometry; strain measurement; temperature measurement; Rayleigh backscattering; backscattered power; coherent OTDR system; coherent optical time domain reflectometry system; distributed temperature measurement; frequency controlled light source; single mode optical fiber measurement; strain measurement; temperature resolution; Backscatter; Frequency measurement; Optical fibers; Optical sensors; Reflectometry; Spatial resolution; Strain measurement; Temperature measurement; Temperature sensors; Time measurement; Fiber sensor; OTDR; Rayleigh scattering; strain measurement; temperature measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Intelligent Computation Technology and Automation (ICICTA), 2010 International Conference on

Conference_Location

Changsha

Print_ISBN

978-1-4244-7279-6

Electronic_ISBN

978-1-4244-7280-2

Type

conf

DOI

10.1109/ICICTA.2010.465

Filename

5522710