Optical fiber measurement method, optical fiber measurement system, and optical fiber measurement device

摘要

PPROBLEM TO BE SOLVED: To provide a method, system, and device for an optical fiber measuring which measures simultaneously a temperature distribution and a strain distribution of an optical fiber. PSOLUTION: Two optical fibers 6, 7 are installed in parallel under the same temperature environment so that a strain distribution is applied to only one optical fiber 6 thereof, and that the other optical fiber 7 is installed in a free state, Then the two optical fibers are subjected to B-OTDR measurement, to thereby find Brillouin frequency shifts fSB1/SB, fSB2/SBof each optical fiber 6, 7. A smaller value (fSB2/SB) of the two acquired Brillouin frequency shifts is divided by a temperature dependency coefficient CSBT/SBto thereby calculate the temperature distribution, and a difference (fSB1/SB-fSB2/SB) between the two Brillouin frequency shifts is divided by a strain dependency coefficient CSB/SBto thereby calculate the strain distribution. PCOPYRIGHT: (C)2009,JPO&INPIT