Optical fiber vector low-intensity magnetic field sensor based on Faraday rotation effect

Abstract

The invention discloses an optical fiber vector low-intensity magnetic field sensor based on a Faraday rotation effect. The optical fiber vector low-intensity magnetic field sensor comprises an input part, a beam splitting area and a sensing area, wherein the input part comprises two input optical fibers and two input optical fiber spatial light collimators; the two input optical fibers are correspondingly connected with the two input optical fiber spatial light collimators respectively; the beam splitting region comprises two polarization cubic crystal beam splitters and a light absorption sheet; the two polarization cubic crystal beam splitters are correspondingly connected with the two input optical fiber spatial light collimators respectively; the light absorption sheet is attached to the emergent light surface of the polarization cubic crystal beam splitter; the sensing area comprises three sensing parts arranged in the Y-axis direction, the Z-axis direction and the X-axis direction respectively, and the three sensing parts are connected with the polarization cubic crystal beam splitter. According to the sensor, the three-dimensional mechanical calibration error of the magnetic field can be effectively improved, a three-dimensional non-orthogonal problem of the vector magnetic field sensor is solved, the structure is compact, and the high-sensitivity magnetic field sensing function is realized.

Description

technical field [0001] The invention relates to the technical field of optical fiber magnetic field sensors, in particular to an optical fiber vector weak magnetic field sensor based on the Faraday rotation optical effect. Background technique [0002] Magnetic field sensors have important application values ​​in geophysical surveying, navigation, military equipment applications, biomedical sensing, and aerospace fields. With the development of application fields such as human-computer exchange, biological imaging, unmanned monitoring, and industrial intelligent manufacturing, high sensitivity, high integration, high monitoring accuracy, wearable, low cost, miniaturization, and three-dimensional vector sensor have been proposed for magnetic field sensors. Sense and other new application requirements. Most of the existing commercial magnetic field sensors are electrical sensors based on the Hall effect, fluxgate, giant magnetoresistance, superconducting quantum interference,...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide an optical fiber vector weak magnetic field sensor based on the Faraday rotation optical effect to solve the technical problems in the prior art, effectively improve the three-dimensional mechanical calibration error of the magnetic field, and then solve the three-dimensional non-orthogonal problem of the vector magnetic field sensor. Compact structure while realizing high-sensitivity magnetic field sensing function

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