Frequency domain induction type magnetic field sensor

A magnetic field sensor, inductive technology, applied in the direction of the size/direction of the magnetic field, can solve problems that are not suitable for geophysical electromagnetic detection, and achieve the effect of stable work, high sensitivity, and small size

Inactive Publication Date: 2012-11-28
中国地质科学院地球物理地球化学勘查研究所
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Problems solved by technology

But they are not suitable for geophysical elec

Method used

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  • Frequency domain induction type magnetic field sensor
  • Frequency domain induction type magnetic field sensor
  • Frequency domain induction type magnetic field sensor

Examples

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Embodiment Construction

[0024] The invention relates to a frequency domain inductive magnetic field sensor, comprising: a magnetic core, a coil frame, an induction coil, a sleeve-shaped electric field shielding layer, a shell, a preamplifier and a frequency compensation circuit, and an output drive circuit. in:

[0025] The coil bobbin and the induction coil are fixed on the magnetic core, the magnetic core, the coil bobbin and the induction coil are housed in the electric field shielding layer, the shell is placed outside the electric field shielding layer, the output of the induction coil is connected to the input of the preamplifier and the frequency compensation circuit, and the preamplifier The output of the frequency compensation circuit is connected with the input of the output driving circuit, and the preamplifier, the frequency compensation circuit and the output driving circuit are installed in the shell.

[0026] The pre-amplification and frequency compensation circuit is composed of a two...

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Abstract

The invention discloses a frequency domain induction type magnetic field sensor, which comprises a magnetic core, an induction coil, a coil bobbin, an electric field shield, a preamplification and frequency compensation device and an output driver, wherein the magnetic core is generated by quenching a high permeability magnetic material iron-based permalloy to strengthen magnetic density through the induction coil; the induction coil and the bobbin are used for generating induced electromotive force under action of an alternating magnetic field; the electric field shield is used for reducing interference of the electric field to sensor output; the preamplification and frequency compensation device is used for amplifying the output signal of the sensor coil and compensating the frequency, so as to enable the output sensitivity of the sensor to be kept basically constant within 1Hz-10000Hz range; and the output driver is used for converting the sensor output signal to a differential signal from a single-ended signal, in order to improve antijamming capability and long-distance transmission capability of the output signal.

Description

technical field [0001] The invention relates to a frequency domain inductive magnetic field sensor, which is especially suitable for geophysical electromagnetic detection in the field environment, and is used for measuring alternating magnetic field signals in the range of 1-10000 Hz. Background technique [0002] At present, the commonly used magnetic field sensors include fluxgate magnetic sensors, nuclear gyromagnetic sensors, superconducting magnetic sensors, etc., and various types of magnetic field sensors. But they are not suitable for geophysical electromagnetic detection in the field environment. Contents of the invention [0003] In view of the above, the object of the present invention is to provide a frequency-domain induction magnetic field sensor based on electromagnetic principles. The sensor can output a magnetic field induction signal with basically the same sensitivity in the range of 1-10000 Hz through circuit adjustment, so as to meet the frequency requ...

Claims

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Application Information

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IPC IPC(8): G01R33/02
Inventor 郑采君林品荣石福升郭鹏李勇李建华徐宝利
Owner 中国地质科学院地球物理地球化学勘查研究所
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