Temperature and strain method of measurement using the physical quantity measuring device and this of optical frequency domain reflectometry method

摘要

A polarization maintaining fiber first end connected to a tunable laser, is connected to the polarization maintaining coupler and the other end, the physical quantity measuring apparatus for optical frequency domain reflectometry method of the present invention, the polarization maintaining one end polarization of the third is connected to the coupler, and a polarization maintaining fiber is a second referential reflecting end at the other end, sensor comprising a fiber Bragg grating in the core is formed, one end of which is connected to said polarization maintaining coupler a polarization maintaining fiber of the fourth is connected to the polarization maintaining coupler and the wave maintaining optical fiber, one end, the polarization axes of the two orthogonal polarization maintaining fiber and said second and polarization maintaining the third and an incident portion for the incident measuring light in both polarization axes of the two orthogonal fiber or polarization maintaining fiber, the first, the incident portion, wherein the third polarization maintaining fiber and the second It is arranged in both of the polarization maintaining fiber.