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Electromagnetic coefficient tester for electromagnetic material and testing method thereof

A magnetoelectric material and tester technology, applied in the direction of magnetic performance measurement, current/voltage measurement, instruments, etc., can solve the problems of inability to measure the continuous change curve of the magnetoelectric coefficient, taking a lot of time and manpower, and having no magnetoelectric coefficient, etc. To achieve the effect of standardization of testing, reducing labor intensity and saving testing time

Inactive Publication Date: 2007-06-06
TSINGHUA UNIV
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  • Application Information

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Problems solved by technology

[0004] The shortcomings of the current testing technology are: only the magnitude of the magnetoelectric coefficient is measured, and there is no phase of the magnetoelectric coefficient; the output voltage of the magnetoelectric material is affected by the capacitance of the lead wire and the tester, which is lower than the real value and needs to be corrected ;Manually record data and operate instruments, the measurement process takes a lot of time and manpower; cannot measure the continuous change curve of magnetoelectric coefficient with angle

Method used

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  • Electromagnetic coefficient tester for electromagnetic material and testing method thereof
  • Electromagnetic coefficient tester for electromagnetic material and testing method thereof
  • Electromagnetic coefficient tester for electromagnetic material and testing method thereof

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Embodiment Construction

[0028] The principle, structure and specific implementation manners of the present invention will be further explained below in conjunction with the accompanying drawings:

[0029] The circuit connection block diagram of this tester is shown in Figure 1. The composition of the tester can be divided into the following parts:

[0030] (1) DC magnetic field generator

[0031] Including: electromagnet 1, DC power supply 2 and Tesla meter 3. DC power supply drives electromagnet to generate DC bias magnetic field H DC . The probe 15 of the Teslameter is placed between the magnetic poles of the electromagnet to measure H DC The size and direction are shown in Figure 2. Changing the output current of the DC power supply can change H DC the size of.

[0032] (2) AC magnetic field generator

[0033] Including: Helmhertz coil 4 and function signal generator 5. The function signal generator outputs a sinusoidal voltage with a frequency from 100Hz-200kHz, and drives the Helmhertz coil to gener...

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Abstract

The invention relates to a test instrument and the test method for the magnetic electric coefficient of the magnetic electric material. The device includes the DC magnetic field generator, the AC magnetic field generator, the signal collecting device, the angle controlling device and the computer with the controlling software. The invention can not only detect the amplitude of the magnetic electric coefficient but the phase, so it is a perfect test system of the magnetic electric coefficient which includes the angle theta, HDC, HAC and frequency f. It can test the spectrum of the coefficient by the computer automatically and it saves the test time and decreases the work strength. The charge amplifier can cancel the influence of the lead capacitance. The angle controlling device can measure the coefficient in region of 0degree-360degree.

Description

Technical field [0001] The invention relates to an instrument and a test method for measuring the magnetoelectric coefficient of a magnetoelectric material, and belongs to the field of material performance testing. Background technique [0002] Magnetoelectric materials are materials with magnetoelectric effects. The magnetoelectric effect is a physical effect, using the magnetoelectric coefficient α E To measure the magnitude of the magnetoelectric effect, the unit is V / cmOe, which is the electric field generated by the material per unit magnetic field. The magnetoelectric coefficient can be obtained by measuring the electric field generated by a magnetoelectric material under a known magnetic field. Magnetoelectric materials can be used in a variety of functional devices such as magnetic field sensors, transducers, and transformers, and have received extensive attention from researchers. [0003] In 1981, Bracks et al. (Bracks.L.P.M.and van Vliet.R.G.A broadband magneto-electri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/12G01R19/00G01R33/00G01R23/16
Inventor 施展南策文蔡宁翟俊宜马静
Owner TSINGHUA UNIV
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