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

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.

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...

AI Technical Summary

Problems solved by technology

However, no matter it is a weak magnetic sensor or its working method, there are deficiencies. First, the structure of the weak magnetic sensor is complicated. First, there are as many as three working coils for the magnetic sensitive element. Working circuit - the pressure measuring part is composed of up to 9 functional circuits. These excessive components and circuits not only increase the power consumption, but also easily cause thermal drift, which makes the measurement work unstable and affects the measurement accuracy. ;Secondly, the working method is to measure the voltage value, which is easily interfered by various external factors, which can easily lead to low measurement accuracy

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