Bidirectional magnetic saturated time difference fluxgate sensor

Abstract

The invention discloses a bidirectional magnetic saturated time difference fluxgate sensor, which is characterized in that two ends of a sensor magnetic core are wound with exciting coils, the middle section of the sensor magnetic core is wound with induction coils, output poles of the induction coils are connected with an amplifying circuit, and the amplifying circuit is connected with a counting display circuit through a band-pass filter circuit and a retardation shaping circuit. By detecting and calculating a positive negative pulse time difference value output by the fluxgate sensor in a time domain, the strength of the measured magnetic field is judged. Compared with the prior fluxgate sensor, the detection circuit is simple, the measurement stability of the system is ensured without a feedback structure, a complex subsequent circuit is not needed, the required excitation current is lower, the data processing is simple, the measured relative quantity is little, the integral volume and power consumption of the sensor are effectively reduced, and the measurement result is acquired quickly. The fluxgate sensor avoids a filter-phase-sensitive demodulation-smooth filter circuit of the prior fluxgate sensor, makes up the defect that the prior fluxgate sensor has harsh process requirement, and achieves the digitized magnetic measurement of the fluxgate sensor.

Description

Technical field: [0001] The invention relates to a fluxgate sensor, in particular to a sensor for measuring weak magnetic field by means of two-way magnetic saturation time difference. Background technique: [0002] The application of fluxgate to measure the weak magnetic field is an important method in many existing methods of weak magnetic field measurement. 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 "Fluxgate S...

AI Technical Summary

Problems solved by technology

At the same time, because the even-order harmonic fluxgate sensor measures the magnetic signal based on the harmonic amplitude, the corresponding detection circuit is relatively complex, including resonance, frequency-selective amplification, integral filtering, and phase-sensitive demodulator.

The existing fluxgate requires a feedback circuit to ensure the stability and linearity of the measurement, but it reduces its own resolution

The follow-up data processing of the fluxgate sensor using this principle is also relatively complicated, which is not conducive to real-time detection when high sensitivity and high precision are required.

Images