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Magnetoelectric sensor

A magnetoelectric sensor and magnet technology, applied in the field of magnetoelectric sensors, can solve problems such as road surface damage, inconvenience, performance impact, etc., achieve high sensitivity, easy installation, and change the effect of magnetoelectric voltage coefficient

Inactive Publication Date: 2011-05-18
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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Problems solved by technology

Traditional vehicle traffic data collection is to detect passing vehicles by laying ground induction coils on the road surface, but this type of sensor needs to be installed and maintained on the road surface, which is very inconvenient and easy to damage the road surface; other sensors such as infrared, ultrasonic Although the detection method does not need to open the road, the performance of products using this method is easily affected by weather such as rain, snow, fog, and strong wind

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Embodiment Construction

[0020] like figure 1 and figure 2 As shown, the magnetoelectric sensor of the present invention includes a magnetoelectric sensor body and two magnets 1a and 1b respectively positioned at the two ends of the magnetoelectric sensor body. The magnetoelectric sensor body includes a piezoelectric material layer 2 and two sides of the piezoelectric material layer 2 The bonded magnetostrictive material layer 4a containing high magnetic permeability powder and the magnetostrictive material layer 4b containing high magnetic permeability powder.

[0021] The preparation method of the magnetoelectric sensor is as follows: take two pieces with a size of 28×12×1mm 3 Terfenol-D (Tb (1-x) Dy x Fe (2-y) , x≈0.3, y≈0) sheets are used as the magnetostrictive material layer, and a series of evenly distributed small holes with a diameter of about 1mm are opened in the thickness direction of the Terfenol-D sheet through the micropore opening process, and the high magnetic permeability The p...

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Abstract

The invention discloses a magnetoelectric sensor, which comprises a magnetoelectric sensor body compounded by a magnetostrictive material layer, a piezoelectric material layer and powder with high magnetic conductivity. In the magnetoelectric sensor, a composite layer of the powder with high magnetic conductivity and a magnetostrictive material is adopted, the magnetoelectric properties in various sections tend to be consistent and the integral performance is optimized; the obtained magnetoelectric efficiency of the magnetoelectric sensor is improved by 20 percent compared with that of a magnetoelectric sensor not provided with the composite layer; and the detection performance of the magnetoelectric sensor is greatly improved.

Description

technical field [0001] The invention relates to the field of magnetoelectric sensors, in particular to a magnetoelectric sensor containing a composite layer of high magnetic permeability powder and magnetostrictive material. Background technique [0002] Observing the movement of ferromagnetic objects (such as automobiles, motorcycles, etc.) has very important and practical significance in traffic control. With the improvement of the popularity of vehicles and the improvement of people's life quality, the number of vehicles in the city has increased rapidly, and the deterioration of traffic conditions has become an urgent problem in the urban traffic system. The improvement method is to establish a perfect traffic monitoring system in the traffic management department. Through the dynamic monitoring of traffic conditions, the traffic can be better controlled and the efficiency of social operations can be realized. The data acquisition system plays a very important role in t...

Claims

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Application Information

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IPC IPC(8): G01D5/12
Inventor 邢增平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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