Title :
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
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;
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
DOI :
10.1109/ICICTA.2010.465
