Method utilizing fiber core mismatch interference structure to measure magnetic field

Abstract

The invention provides a method utilizing a fiber core mismatch interference structure to measure a magnetic field. The method comprises steps that a), a fiber core dislocation welding interference structure is established, and the fiber core dislocation welding interference structure comprises a pumping source, a wavelength division multiplexer, a gain fiber, a first single-mode fiber, a second single-mode fiber, a third single-mode fiber and a spectrum analyzer which are sequentially connected; b), fiber dislocation welding of the first single-mode fiber, the second single-mode fiber and the third single-mode fiber is carried out; c), an applied magnetic field of a to-be-measured temperature control device is measured, the first single-mode fiber, the second single-mode fiber, the third single-mode fiber and the temperature control device are combined to be one body, stretching, bending, vibration or extrusion effects on a sensor are realized through the applied magnetic field to cause polarization of a fiber core mismatch interferometer to change, a magnetic field applied to the sensor is determined through utilizing a formula as follows, Y=aX-b, X is magnetic field concentration, Y is changing wavelength, and a and b are constants.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a method for measuring a magnetic field by using a fiber core mismatch interference structure. Background technique [0002] The all-fiber sensor has the advantages of compact structure, long service life, sensitivity to test volume, and multiple transmission channels, and is widely used in optical fiber sensing, optical fiber communication, optical processing and other fields. Through the micro-machining technology of the fiber end face or building an all-fiber sensor with an interference structure, under the action of the pump source, an interference spectrum curve with a comb-like spectrum pattern is output. The thin-core optical fiber Mach-Zehnder optical fiber sensor has a simple structure and is easy to implement. The structure consists of a thin-core optical fiber welded to two relatively thick core-diameter doped rare-earth optical fibers. The doped rare-earth optical...

AI Technical Summary

Problems solved by technology

However, these fiber optic sensors have shortcomings, which are limited in practical application.

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