Optical fiber interference type magnetic sensor probe

Abstract

The invention provides an optical fiber interference type magnetic sensor probe, which comprises an interferometer sensing arm, an interferometer referring arm, input polarization maintaining optical fibers, a Y waveguide integrated optical device, a polarization-maintaining optical fiber coupler, two paths of output polarization-maintaining optical fibers and a runway type framework. The interferometer sensing arm is formed by alternately connecting a plurality of multi-layer film structure sections and a plurality of bare optical fiber sections at intervals. The multi-layer film structure sections are the film-plated polarization-maintaining optical fibers, and a magnetostrictive material film layer, an insulating material film layer and a spiral coil layer is sequentially formed outside a fiber core of the polarization-maintaining optical fiber. The bare optical fiber sections are the polarization-maintaining optical fiber. Coils of adjacent two sections of multilayer file structure sections are connected in series in the bar optical fiber sections. The interferometer referring arm is made of polarization-maintaining optical fibers. The interferometer sensing arm and the interferometer referring arm are wounded in parallel and are fixed on the runway type framework. The runway type framework is internally provided with a cavity for accommodating the Y waveguide integrated optical device and the polarization-maintaining optical fiber coupler. The magnetic sensor probe provided by the invention has the beneficial effects that: the flexibility is improved, the volume is reduced and the consumed power is low.

Description

technical field [0001] The invention belongs to the technical field of sensing and testing, and in particular relates to a magnetostrictive effect-based multilayer optical fiber interference magnetic sensor probe for weak magnetic measurement. Background technique [0002] Weak magnetic field measurement is widely used in military and national economic fields. At present, there are many methods for measuring weak magnetic fields, the main methods include fluxgate method, magneto-optical pump method, proton method, superconducting quantum interference method and optical fiber sensing method, etc. The magnetometers made using the basic principles of these methods have various characteristics. Not the same. Among them, the fluxgate method is the first developed weak magnetic measurement method. The resolution of the fluxgate magnetometer is generally 0.1nT ~ 10nT, but the volume is relatively large. The probe size is generally around Φ85mm×55mm, and the price is relatively hig...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems that the existing optical fiber interference type magnetic sensor probe has a large volume, the combination of magnetostrictive material and optical fiber is not tight, and the power consumption is large, the present invention proposes a multi-layer structure optical fiber interference type magnetic sensor probe based on the magnetostrictive effect

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