Magnetic sensor based on amorphous magnetic core coil and working method thereof

A magnetic sensor and magnetic core technology, applied in the direction of instruments, measuring magnetic variables, measuring devices, etc., can solve the problems of increasing power consumption, affecting the accuracy of measurement, thermal drift, etc., to improve stability and accuracy, improve accuracy, The effect of reducing distractions
CN102478646AInactive Publication Date: 2012-05-30HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
Publication Date
2012-05-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a magnetic sensor based on an amorphous magnetic core coil and a working method thereof. The sensor consists of an amorphous magnetic core magnetic sensitive element and a working circuit, wherein the amorphous magnetic core magnetic sensitive element is a block magnetic core (1) formed by laminating a sheeting amorphous material; an induction coil (2), an insulating layer (3) and a biased coil (4) are sequentially arranged outside the block magnetic core (1); the working circuit consists of a biased circuit (5), an oscillating circuit (6) and a frequency-measuring circuit (7); and the induction coil (2) is the induction coil in the oscillating circuit (6). The working method comprises the following steps of: adjusting the working current of the biased coil to obtain the magnetic field strength H0 when the amorphous magnetic core magnetic sensitive element is under the magnetic field strength of 1 to 200e; placing the amorphous magnetic core magnetic sensitive element in a magnetic field to be measured, and measuring the resonance frequency fx output by the oscillating circuit; and obtaining the magnetic field strength Hx when the resonance frequency is fx according to the formula that fx is equal to 5.94Hx+36.51, and obtaining the strength delta Hx of the magnetic field to be measured according to the formula that delta Hx is equal to Hx-H0. The magnetic sensor and the method can be widely used for high-precision measurement on a weak magnetic field.
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Description

technical field

[0001] The invention relates to a magnetic sensitive sensor and a working method, in particular to a magnetic sensitive sensor based on an amorphous magnetic core coil and a working method thereof. Background technique

[0002] In aircraft navigation, missile guidance systems, and medical fields, it is often necessary to detect weak magnetic fields on the order of milliseconds or nanotesla. It has important application value and broad market prospect to develop high-sensitivity magnetic sensor which can detect the weak magnetic field measurement including the geomagnetic field of millitesla level and biomagnetic field of nanotesla level.

[0003] Recently, it has been found that at room temperature, the giant magneto-impedance (GMI) effect of amorphous materials is very sensitive to weak magnetic fields, and the effect is significant, the response speed is fast, the sensitivity is high, and there is no hysteresis. The magnetic field sensitivity is an order o...

Claims

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