Title :
Technique for measuring the dynamic strain on an optical fiber based on Brillouin ring amplification
Author :
Ogawa, Osamu ; Kato, Tatsuya ; Kamikatano, Mitsuru
Author_Institution :
Comput. & Commun. R&D Center, Tokyo Electr. Power Co. Inc., Japan
fDate :
2/1/1999 12:00:00 AM
Abstract :
A new technique for measuring the dynamic strain on an optical fiber, named Brillouin ring amplification system (BRAS), is proposed. In the BRAS, Stokes light of sufficiently high intensity to detect instantaneous strain change can be obtained by the effect of Brillouin ring amplification. Experimental results demonstrate that the BRAS enables a measurement of dynamic strain with a period of about two seconds as well as its spatial distribution over an 11-km long fiber with an accuracy of ±0.006% strain. Theoretical studies on measurable distance indicate that the BRAS can be used in the case of a long fiber of about 40 km with a resolution of twenty meters
Keywords :
Brillouin spectra; distributed sensors; fibre optic sensors; optical fibre amplifiers; optical fibre testing; strain measurement; strain sensors; 11 km; 40 km; BRAS; Brillouin ring amplification; Brillouin ring amplification system; Stokes light; dynamic strain measurement; high intensity; instantaneous strain change; long fiber measurements; measurable distance; optical fiber; spatial distribution; Brillouin scattering; Capacitive sensors; Frequency; Optical fiber sensors; Optical fibers; Optical propagation; Optical scattering; Probes; Strain measurement; Temperature measurement;
Journal_Title :
Lightwave Technology, Journal of
