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Inductive magnetic sensor and electromagnetic surveying device

A magnetic sensor and inductive technology, applied in the field of geophysical exploration, can solve the problems of large noise, low sensitivity of extremely low frequency signals, low signal-to-noise ratio, etc., and achieve the effect of expanding low frequency characteristics and excellent low frequency magnetic sensors

Inactive Publication Date: 2019-03-01
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

However, when measuring extremely low frequencies, the signal cannot be picked up normally due to the extremely low sensitivity of the extremely low frequency signals. On the other hand, the high frequency noise is very large, resulting in a very low signal to noise ratio for low frequency measurements embarrassment

Method used

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  • Inductive magnetic sensor and electromagnetic surveying device
  • Inductive magnetic sensor and electromagnetic surveying device
  • Inductive magnetic sensor and electromagnetic surveying device

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Embodiment Construction

[0046] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0047] combine figure 2 As shown, an inductive magnetic sensor is provided in an embodiment of the present invention, including a signal preamplification measurement circuit, a feedback loop, a magnetic core and a coil, a low-noise zero stabilization processing circuit, and an output protection module. The input terminal of the coi...

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Abstract

The invention provides an inductive magnetic sensor, comprising a signal pre-amplification measuring circuit, a feedback loop, a magnetic core, a coil, a low-noise zeroing processing circuit and an output protection module, wherein the input end of the coil is electrically connected with the signal pre-amplification measuring circuit; the signal pre-amplification measuring circuit is electricallyconnected with the low-noise zeroing processing circuit; the output end of the coil is electrically connected to the feedback loop; the feedback loop and the low-noise zeroing processing circuit are electrically connected to the output protection module. The introduction of a resonant wave trap can further extend the bandwidth to a low frequency, expands the low -frequency characteristic of the magnetic sensor, and obtain an excellent low-frequency magnetic sensor. The invention also provides an electromagnetic surveying device.

Description

technical field [0001] The invention relates to the field of prospecting geophysics, in particular to an inductive magnetic sensor and electromagnetic prospecting equipment. 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 by measuring the output voltage of the coil. The characteristic of the MT magnetic sensor is to obtain low-frequency and ultra-low-frequency magnetic field signals. By winding tens of thousands of coils on a high-permeability magnetic core, using a low-noise amplifier circuit and using a magnetic flux negative feedback structure, the magnetic field is converted into a measurement voltage. [0003] Such as figure 1 As shown, an equivalent circuit diagram of an indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/10G01R33/06
CPCG01R33/06G01V3/104
Inventor 底青云真齐辉王煜亮刘志尧杨全民
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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