Optical fiber sensor and strain and temperature measurement method using optical fiber sensor

摘要

PPROBLEM TO BE SOLVED: To provide an optical fiber sensor which is easy to handle and can easily measure the distribution of distortion or temperature, with a resolution below a distance resolution of a B-OTDR (Brillouin Optical Time Domain Reflectometer) measuring device or an R-OTDR (Raman Optical Time Domain Reflectometer) measuring device. PSOLUTION: This optical fiber sensor is constituted of a cylinder 12 having an outer diameter and an inner diameter formed uniformly respectively, and an optical fiber 11 having a spirally wound portion wound spirally at a prescribed pitch cycle and involved in a hollow part 12a of the cylinder 12. One end of the optical fiber 11 is connected to the B-OTDR measuring device 13 for measuring a frequency shift amount of Brillouin scattering light, and the whole spirally wound portion is stuck and fixed in the adhering state to the inner circumferential surface 12b of the cylinder 12, and the optical fiber length of the spirally wound portion is set to be a length longer than the minimum resolution of the B-OTDR measuring device 13. PCOPYRIGHT: (C)2009,JPO&INPIT