Full-automatic measurement device for magnetoelectric properties of magnetoelectric material and measuring method thereof

Abstract

This invention belongs to magnetic electricity material domain, which conretely relates to using fictitious multichannel phase-locking enlarging principle to implement test material magnetic electricity function method and device of computer control. This invention make phase-locking amplifier fictitious, which is that computer software implements function of phase-locking amplifier. It is very convenient to carry out phase-locking agnification process for random multipath signal by using fictitious phase-locking amplifier. Therefore, it not only precisely automatically survey dE and dH, improve magnetic electricity function measurement precision, but also work frequency limit is boosted a lot compared to hardware phase-locking amplifier, meanwhile decrease manufacture cost of magnetic electricity measuring device. This invention also combines control and measurement of apposition cocurrent offset magnetic field to boost automaticity of magnetic electricity measuring device, thereby improve precision and efficiency of magnetic electricity measurement.

Description

technical field [0001] The invention belongs to the field of magnetoelectric materials, and relates to a measurement technology of magnetoelectric properties of magnetoelectric materials, in particular to a fully computer-controlled device for measuring magnetoelectric properties of magnetoelectric materials and a measurement method thereof realized by using the principle of virtual multi-channel phase-locked amplification. Background technique [0002] Magnetoelectric properties refer to the dielectric polarization of a material induced by an external magnetic field, or the magnetization induced by an external electric field. Generally speaking, the magnetoelectric properties refer to the magnetic field-induced dielectric polarization unless otherwise specified. Magnetoelectric properties have broad application prospects in many high-performance magnetoelectric functional components. Specifically, it can be used in many fields such as magnetic field detection, magnetoelectr...

AI Technical Summary

Problems solved by technology

Therefore, the measurement of the magnetoelectric response signal of the magnetoelectric material involves weak signal detection, and the precise magnetoelectric measurement equipment must use a lock-in amplifier. Due to the high price of the lock-in amplifier, the cost of the existing magnetoelectric measurement equipment at home and abroad expensive

On the other hand, by α ME =dV / (tdH) It can be seen that the acquisition of magnetoelectric properties requires simultaneous measurement of dV and dH, but each common commercial lock-in amplifier can only perform lock-in amplification processing on the signal of one channel, and cannot measure dV and dH at the same time , so the current common practice at home and abroad is to only measure dV and nominally fix dH[1-2]

In actual measurement, especially when the frequency of the AC magnetic field changes, it is not easy to completely fix dH, so it is impossible to do accurate dynamic monitoring of the magnetic field, and thus it is impossible to obtain accurate magnetoelectric properties

The operating frequency range of the lock-in amplifier is also an important indicator of the measurement capability of the magnetoelectric test system. The operating frequency of the general lock-in amplifier is below 200kHz. If the test conditions exceed this operating frequency range, then the lock-in amplifier cannot be used. Meet the needs of the test, the test cannot be carried out

If you want to expand the test frequency of the equipment, you need a more expensive broadband lock-in amplifier, which will undoubtedly further increase the equipment cost

In addition, the change of the magnetoelectric properties with the applied DC bias magnetic field and the change of the magnetoelectric properties with the frequency of the applied AC magnetic field must be measured separately [1-2]. change in frequency

It can be seen that the existing magnetoelectric measurement equipment at home and abroad is expensive, the accuracy and frequency upper limit are not high enough, and the degree of automation of the measurement process needs to be improved urgently.

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