Temperature-compensated optical fiber sagnac interference ring strain sensor

Abstract

The invention relates to a temperature-compensated optical fiber sagnac interference ring strain sensor in the technical field of optical fiber sensing, which comprises an Hi-Bi sagnac interference ring, an optical fiber micro-ring resonator, an optical precision displacement platform, a light source and a spectrum analyzer, wherein the light source is connected with the optical fiber micro-ring resonator, the Hi-Bi sagnac interference ring is connected with the optical fiber micro-ring resonator, the optical fiber micro-ring resonator is connected with the spectrum analyzer, and the Hi-Bi sagnac interference ring is arranged on the optical precision displacement platform; the Hi-Bi sagnac interference ring comprises a coupler, a polarization controller and a birefringent optical fiber, wherein the birefringent optical fiber is used as a sensing arm and simultaneously placed in a temperature field and a strain field; and the optical fiber micro-ring resonator comprises a substrate and a polymer optical fiber ring, wherein the polymer optical fiber ring is only placed in the temperature field for temperature compensation. The invention effectively solves the cross sensitivity problem of the temperature and the strain and has small size, simple structure, low cost and high measuring sensitivity.

Description

Optical fiber sagnac interference ring strain sensor with temperature compensation technical field The invention relates to a device in the technical field of optical fiber sensing, in particular to an optical fiber high birefringence sagnac interference ring (Highbirefringentsagnacloop, Hi-Bisagnacloop, high birefringence Sagnac interference ring) strain sensor with temperature compensation. Background technique In recent years, the application of optical fiber sagnac interference rings in sensing has attracted more and more attention. In the optical fiber sagnac interference ring sensing scheme, the high birefringence optical fiber sagnac ring has great application prospects in the field of optical fiber sensing. Hi-Bisagnac (high birefringence Sagnac) interference ring is a series of high birefringence fiber in the basic sagnac ring, the output spectrum presents periodic filtering characteristics, and the period of the output spectrum is determined by the Hi-Bi in the r...

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