Magnetic flux door sensor probe

Abstract

The invention discloses a novel fluxgate sensor probe, which adopts a circular magnetic core, an independent exciting winding is coiled on the magnetic core, then a magnetic loop is positioned in a ground groove on a square skeleton with a hollowed center shaped like a Chinese character <Jing>, and four coils having the same number of turns are respectively coiled on four sides of the skeleton to serve as induction and feedback coils. The induction coils can greatly reduce the bucking effect to a closed magnetic line of an external magnetic field itself on the magnetic core, and can induce the most of magnetic flux in one direction of the external magnetic field when passing through the saturated magnetic core, and the feedback coils can generate a feedback magnetic field with the direction similar to the direction of the external magnetic field on the magnetic core, the external magnetic field is better offset, therefore, the fluxgate sensor probe has the advantages of low noise, low error, high precision, linearity degree and stability when measuring weak magnetic fields.

Description

technical field [0001] The invention relates to a fluxgate sensor probe for detecting magnetic field strength, in particular to a fluxgate sensor probe capable of detecting weak magnetic fields. Background technique [0002] In the measured magnetic field, under the saturation excitation of the alternating magnetic field, the voltage in the induction coil will change "asymmetrically". The fluxgate sensor uses this mechanism to measure the component of the weak magnetic field vector. Fluxgate sensors are used to measure the geomagnetic field, underground pipelines and ferromagnetic object detection, geological exploration, power line detection, vehicle control, etc., and the fluxgate sensor probe is the core component of the fluxgate sensor. [0003] At present, the fluxgate sensor probes used for weak magnetic field detection generally use racetrack or ring-shaped permalloy sheets as the magnetic core structure, and a group of coils are tightly and uniformly wound on the mag...

AI Technical Summary

Problems solved by technology

However, because the external magnetic field on the magnetic core generates closed magnetic force lines, the dotted line is the external field induced magnetic force line, and the induction coil of the fluxgate sensor probe senses the magnetic field in the opposite direction at the center of the magnetic core at the same time, so part of the external magnetic field itself generates closed magnetic force lines. In addition, the magnetic field generated by the feedback coil has a large angle with the direction of the induced magnetic field on the magnetic core, so there are certain defects in the accuracy, sensitivity and linearity of the measurement results.

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