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Capacitive magnetic field intensity sensor based on magnetic liquid drips

A magnetic liquid and sensor technology, applied in the field of sensor measurement, can solve problems such as inability to measure in real time

Active Publication Date: 2019-04-16
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
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Problems solved by technology

At present, it is still impossible to achieve accurate real-time measurement of the small magnetic field with high frequency changes under the condition of guaranteeing the cost

Method used

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  • Capacitive magnetic field intensity sensor based on magnetic liquid drips

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Embodiment Construction

[0014] to attach figure 1 The present invention will be further described for the specific embodiment:

[0015] A capacitive magnetic field strength sensor based on magnetic liquid droplets, the sensor includes: a positive connection port 1, a negative connection port 2, a capacitor positive plate 3, a capacitor negative plate 4, a magnetic liquid droplet 5, and sealed air 6 , Seal the cavity 7.

[0016] The positive connection port 1 is connected to the positive electrode plate 3 of the capacitor, and the negative connection port 2 is connected to the negative electrode plate 4 of the capacitor. The positive electrode plate 3 of the capacitor and the negative electrode plate 4 of the capacitor are respectively located on both sides of the sealed cavity 6. Located at the bottom of the sealed cavity 7 , the sealed air 6 is located at the upper part of the sealed cavity 7 .

[0017] The overall size of the sensor is on the order of millimeters. When there is no external magnet...

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Abstract

The invention provides a capacitive magnetic field intensity sensor based on magnetic liquid drips. The capacitive magnetic field intensity sensor is applicable to precise measurement on a high-frequency tiny magnetic field. The capacitive magnetic field intensity sensor comprises a positive electrode wiring port (1), a negative electrode wring port (2), a capacitive positive electrode plate (3),a capacitive negative electrode plate (4), magnetic liquid drips (5), sealed air (6) and a sealed cavity (7). The magnetic liquid drips (5) are soft magnetic materials, have superparamagnetism, and have ultrashort relaxation time; when an external magnetic field exists, the magnetic liquid drips (5) instantly form the peak, so that the dielectric constant of media between the capacitive positive electrode plate (3) and the capacitive negative electrode plate (4) changes; the capacitance change is further caused; after the magnetic field is eliminated, the magnetic liquid drips (5) return to the bottom of the sealed cavity (7); capacitance also returns to an initial value; and the relaxation time of the magnetic liquid drips (5) is very short, and residual magnetism and coercive force do not exist, so that the precise measurement on the high-frequency tiny magnetic field is realized.

Description

technical field [0001] The invention belongs to the field of sensor measurement and is suitable for precise measurement of high-frequency tiny magnetic fields. Background technique [0002] The measurement of the magnetic field has a long history. Initially, the purpose of measuring the magnetic field was to identify the direction, and it was only a qualitative measurement. With the continuous development of physics and electronic technology, it is necessary to accurately measure the magnetic field. The magnetic field measurement usually takes the magnitude of the magnetic field strength as the standard. At present, extremely high requirements are placed on the accurate measurement of the magnetic field in the fields of geophysics, space science, biomedicine, industrial flaw detection, and military technology. [0003] Commonly used methods for magnetic field measurement include fluxgate method, Hall effect method, magnetoresistance effect method, magnetic resonance method, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/02
CPCG01R33/02
Inventor 谢君李德才
Owner BEIJING JIAOTONG UNIV
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