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Full-band magnetic sensor

A magnetic sensor and full frequency band technology, applied in the field of geophysical exploration, can solve the problem that the measurement bandwidth of the magnetic sensor is difficult to extend, and achieve the effect of large low-frequency magnification, small measurement bandwidth and high-frequency magnification

Inactive Publication Date: 2019-03-01
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a full-band magnetic sensor, which aims to solve the technical problem that the measurement bandwidth of the magnetic sensor in the prior art is difficult to extend to the ultra-low frequency of 0.001 Hz

Method used

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Examples

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Embodiment 1

[0031] as attached Figure 2-3 As shown, the full-band magnetic sensor provided in this embodiment includes an induction coil, an impedance conversion circuit, a voltage measurement module, and an integrator that are electrically connected in sequence.

[0032] The induction coil is used to generate an induced electromotive force according to the passing magnetic flux.

[0033] The impedance conversion circuit is connected to the output end of the induction coil, which is used to increase the loop resistance of the induction coil and reduce the quality factor Q value of the corresponding signal, so that the amplitude characteristic at the resonance frequency point is suppressed, and the signal-to-noise ratio of the measurement signal is improved .

[0034] The voltage measuring module is electrically connected with the impedance transformation circuit and is used for measuring the induced electromotive force generated by the induction coil.

[0035] The integrator is electri...

Embodiment 2

[0073] Embodiment 2 is an embodiment of performing a performance test on a magnetic sensor of the present invention.

[0074] There is a magnetic sensor with a resonant frequency of 20kHz in the laboratory, which can be applied to controllable source audio frequency (CSAMT) detection. The self-inductance of the measurement coil is 0.3459H, the parasitic capacitance is 170pF, and the resistance of the measurement coil is 1934Ω. The equivalent area is S=112.903mm2, the number of turns of the measuring coil is 10000 turns, the feedback resistance Rf=1kΩ, the number of turns of the feedback coil is 35 turns, the effective magnetic permeability is 705, and the magnification is 1, then the formula (1) It can be seen that the conversion relationship between whether the measuring coil has feedback magnetic flux or not is as follows: Figure 4 shown.

[0075] It can be seen that as the feedback resistance decreases, the feedback depth increases and the bandwidth expands. However, the ...

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Abstract

The invention is suitable for the technical field of exploration geophysics, and provides a full-band magnetic sensor. The magnetic sensor comprises an induction coil, a voltage measurement module andan integrator. The full-band magnetic sensor detects an induced electromotive force generated by the induction coil through the voltage measurement module, and then the integrated has the characteristics of a large low-frequency amplification factor and a small high-frequency amplification factor, thereby achieving the extension of measurement bandwidth, enabling the measurement bandwidth of themagnetic sensor to extend to the ultralow frequency of 0.001Hz, and achieving the full-band measurement under the condition that there is no flux negative feedback.

Description

technical field [0001] The invention belongs to the technical field of exploration geophysics, and in particular relates to a full frequency band magnetic sensor. Background technique [0002] The inductive magnetic sensor (hereinafter referred to as the magnetic sensor) is based on Faraday's law of electromagnetic induction, using the proportional relationship between the output voltage of the coil and the change in the magnetic flux passing through the coil, and indirectly measuring the magnetic field through the output voltage of the induction coil. [0003] The frequency band measured by the electromagnetic method is very wide, ranging from a period of 0.001Hz to 10kHz. Because the quality factor of the coil is usually high, it is difficult to expand its bandwidth. The existing technology almost uses the magnetic flux negative feedback method to expand the measurement bandwidth. figure 1 It is a schematic diagram of the circuit structure of the inductive magnetic sensor...

Claims

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Application Information

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IPC IPC(8): G01V3/10G01R33/06
CPCG01R33/06G01V3/10G01R33/0023G01R33/02H01F27/28
Inventor 底青云真齐辉张天信王煜亮刘志尧杨全民
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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