Signal detection circuit of magnetic-flux-gate magnetometer, and the magnetic-flux-gate magnetometer

A signal detection and magnetometer technology, which is applied in the field of signal detection circuit and fluxgate magnetometer, can solve the problem that the signal detection circuit cannot guarantee the signal resolution.

Active Publication Date: 2017-02-22
INST OF GEOPHYSICS CHINA EARTHQUAKE ADMINISTRATION
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Problems solved by technology

[0004] The purpose of the present invention is to provide a signal detection circuit of a fluxgate magnetometer and the fluxgate magnetometer, which are used to solve the p

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  • Signal detection circuit of magnetic-flux-gate magnetometer, and the magnetic-flux-gate magnetometer
  • Signal detection circuit of magnetic-flux-gate magnetometer, and the magnetic-flux-gate magnetometer
  • Signal detection circuit of magnetic-flux-gate magnetometer, and the magnetic-flux-gate magnetometer

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[0031] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0032] refer to figure 1 , the feedback circuit 6 of the existing signal detection circuit of the fluxgate magnetometer consists of a separate resistor R f Composition, which obviously belongs to the linear feedback circuit.

[0033] The input / output signal relationship of the integrating circuit in the existing signal detection circuit is as follows: figure 2 As shown, the abscissa in the figure is the input, the unit is nT, the ordinate is the output, the unit is V, and the solid line in the figure is the ideal normal output, and the corresponding dotted line is the actual unstable output. to combine figure 1 and figure 2 , when the input signal of the ...

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Abstract

The invention relates to the technical field of seismic, and discloses a signal detection circuit of a magnetic-flux-gate magnetometer, and the magnetic-flux-gate magnetometer. The signal detection circuit includes a signal channel and an excitation channel, wherein the signal channel acquires a magnetic field signal from a sensing probe; the excitation channel outputs an excitation signal to the sensing probe; the signal channel includes successively connected probe input circuit, frequency selection amplification circuit, phase sensitive detection circuit, integrating circuit and feedback circuit; the feedback circuit comprises a first feedback path and a second feedback path; the first feedback path is configured as a linear feedback circuit; the second feedback path is connected with the first feedback path in parallel, and is configured as a non-linear feedback circuit; and the second feedback path works when the magnetic field signal detected by the sensing probe reaches the relative maximum measuring range for observation. The signal detection circuit of a magnetic-flux-gate magnetometer utilizes the non-linear negative feedback method, and converts different feedback branches when a small signal is input and when a large signal is input, thus solving the problem that a traditional signal detection circuit cannot give consideration to both the resolution of the signal and allowance of input of the large signal.

Description

technical field [0001] The invention relates to the technical field of earthquakes, in particular to a signal detection circuit of a fluxgate magnetometer and the fluxgate magnetometer. Background technique [0002] Geomagnetic signals carry non-rich geophysical information, so geomagnetic observation is an important observation method of the China Earthquake Precursor Network, and the fluxgate magnetometer is the most important observation instrument. Fluxgate magnetometer is a vector-type sensitive sensor used to measure DC magnetic field or low-frequency magnetic field. It is the most widely used instrument for measuring quasi-static and slowly changing vector magnetic fields, and it is also the most precise vector-type magnetic field sensor at room temperature. It can accurately measure the strength and direction of the geomagnetic field, and has the advantages of low noise, high resolution, good temperature stability, wide measurement range, weak magnetic measurement, l...

Claims

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Application Information

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IPC IPC(8): G01V3/40
CPCG01V3/40
Inventor 胡星星滕云田范晓勇李彩华张旸汤一翔王喆
Owner INST OF GEOPHYSICS CHINA EARTHQUAKE ADMINISTRATION
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