Fluxgate magnetometer detection circuit and method for improving accuracy thereof

Abstract

The invention relates to a fluxgate magnetometer detection circuit and a method for improving accuracy thereof. The fluxgate magnetometer detection circuit is characterized in that: a fluxgate probe is connected with an amplification filter I; the fluxgate probe and the amplification filter I are connected with a gain selection respectively; the gain selection is connected with a acquisition circuit through an amplification filter II and a detection integration; the detection integration is connected with the fluxgate probe through a feedback selection; a simulation management circuit is connected with the gain selection and the detection integration respectively; the simulation management circuit is connected with the fluxgate probe through a probe driving circuit; the simulation management circuit is connected with the fluxgate probe through the feedback selection; the simulation management circuit is connected with the acquisition circuit. The simulation management circuit can automatically select an optimal forward channel, a detection pulse and a feedback link according to an outside magnetic field size so that the fluxgate magnetometer can acquire high accuracy and a high signal to noise ratio on an optimal range. Especially in component magnetic field measurement with a large range change, the high signal to noise ratio can be still obtained.

Description

technical field [0001] The invention relates to a method and device for improving the detection accuracy and signal-to-noise ratio of a fluxgate magnetometer used for geomagnetic field detection. Background technique [0002] Fluxgate technology is an important method among many existing magnetic field weakening measurement methods. The basic principle of this method is to use Faraday's electromagnetic induction phenomenon and magnetic saturation phenomenon to convert magnetic signals into electrical signals for measurement. Existing fluxgate products calculate the magnitude of the measured magnetic field by detecting the even-order harmonic amplitude of the output signal, and its sensitivity is restricted by the noise of the fluxgate probe. Generally, it is necessary to use differential probes that can suppress noise or have compensation structures. structure. Numerous existing patents are also designed based on this aspect, such as the "fluxgate sensor probe" disclosed in...

AI Technical Summary

Problems solved by technology

However, these patents all use the traditional structure of the even-order harmonic method, which cannot obtain a high signal-to-noise ratio in the measurement of component magnetic fields that vary in a wide range.

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