Integrated closed-loop temperature measuring method on basis of Y-branch phase modulator temperature characteristics

Abstract

The invention provides an integrated closed-loop temperature measuring method on the basis of Y-branch phase modulator temperature characteristics and belongs to the technical field of optical-fiber Sagnac interferometers. The integrated closed-loop temperature measuring method includes steps of firstly shutting down temperature closed-loop adjustment in a Sagnac interferometer and manually adjusting temperature compensation value so as to enable voltage difference generated by temperature excursion to be zero; turning on the temperature closed-loop adjustment in the optical-fiber Sagnac interferometer and measuring compensation values A at different temperatures; acquiring a linear relation between the temperature T and the compensation values A by a linear fitting method; finally calculating practical temperature by the linear relation. Based on the original structure of the optical-fiber Saganc interferometer, the temperature of the optical-fiber Sagnac interferometer can be measured without extra temperature sensing devices. In addition, the integrated closed-loop temperature measuring method is large in measurement range and high in sensitivity and reliability, and integral size and power consumption of the optical-fiber Sagnac interferometer are reduced.

Description

technical field [0001] The invention relates to the technical field of fiber optic Sagnac interferometers, in particular to an integrated closed-loop temperature measurement method based on the temperature characteristics of a Y-branch phase modulator. Background technique [0002] The fiber optic Sagnac interferometer is a high-precision optical measuring instrument, which uses the light ring to be sensitive to the physical quantity to be measured (angular velocity, electromagnetic field strength) and generate a phase difference. This interferometer can be applied to various fields such as fiber optic gyroscopes, fiber optic current transformers, and voltage transformers. [0003] figure 1 It is a schematic structural diagram of a typical interferometric fiber-optic Sagnac interferometer, which mainly includes a light source, a coupler, a Y-branch phase modulator, an optical fiber ring, a detector and a signal processing device. When the optical fiber Sagnac interferomete...

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Problems solved by technology

[0006] Aiming at the problems of increased volume, power consumption and reduced reliability of the optical fiber Sagnac interferometer caused by additional temperature sensors, the present invention proposes an integrated closed-loop optical fiber Sagnac interferometer based on the temperature characteristics of the Y-branch phase modulator temperature measurement method

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