MULTIPOINT STRAIN MEASURING SYSTEM USING OFDR METHOD

摘要

PROBLEM TO BE SOLVED: To upgrade a real-time property and a speed of response of a measurement by improving a data analyzing method in a multipoint strain measuring system using an OFDR (optical frequency domain reflectometry) method in which a plurality of FBGs are arranged in an optical fiber. SOLUTION: In the multipoint strain measuring system, the plurality of fiber Bragg gratings (FBGs) which make up a periodic structure of refractive index inside the core of the optical fiber, are arranged in one optical fiber, and the measuring method (OFDR) which uses periodic changes in interferential intensity of light, is conducted. The system also has such a function that signals from the FBG on a specific position are quickly separated by using a band-pass filter with a preset bandpass range which filters out detected light signals. COPYRIGHT: (C)2004,JPO&NCIPI