阅读说明：本技术 一种基于磁电效应的磁梯度计 (Magnetic gradiometer based on magnetoelectric effect ) 是由 郁国良 邱阳 周浩淼 朱明敏 杨浛 于 2019-11-22 设计创作，主要内容包括：本发明公开了一种基于磁电效应的磁梯度计,包括读取单元及若干串联的多铁性磁传感器,所述读取单元输入端连接多铁性磁传感器,读取单元的输出端作为信号读取端,其中每个多铁性磁传感器之间的相对摆放方向一致。本发明利用多铁性磁传感器接收到磁场后会产生电势差的原理,利用串联的方式可以实现电势差的叠加或抵消,如以抵消的方式串联,将多铁性磁传感器放置在不同磁场环境中,则可以测量出不同磁场的强度差。本发明的实质性效果包括：通过特定结构及连接方式实现直接测量磁场强度差值,不再依赖额外的计算,测量简单快捷。(The invention discloses a magnetic gradiometer based on a magnetoelectric effect, which comprises a reading unit and a plurality of multiferroic magnetic sensors connected in series, wherein the input end of the reading unit is connected with the multiferroic magnetic sensors, the output end of the reading unit is used as a signal reading end, and the relative arrangement directions of the multiferroic magnetic sensors are consistent. The invention utilizes the principle that the multiferroic magnetic sensor can generate potential difference after receiving the magnetic field, and can realize superposition or offset of the potential difference in a series connection mode, for example, the multiferroic magnetic sensor can be connected in series in an offset mode, and the strength difference of different magnetic fields can be measured when the multiferroic magnetic sensor is placed in different magnetic field environments. The substantial effects of the invention include: the magnetic field intensity difference value is directly measured through a specific structure and a connection mode, extra calculation is not needed, and the measurement is simple and rapid.)

1. The utility model provides a magnetism gradiometer based on magnetoelectric effect, its characterized in that, is including reading many ferroic magnetic sensor of unit and a plurality of series connection, reading many ferroic magnetic sensor is connected to the unit input, and the output that reads the unit is as signal reading end, and wherein the relative orientation of putting between every many ferroic magnetic sensor is unanimous.

2. The magnetic gradiometer based on magnetoelectric effect according to claim 1, characterized in that the multiferroic magnetic sensor comprises at least one piezoelectric layer and at least one magnetostrictive layer, wherein the end with lowest working electromotive force is used as a cathode, the end with highest working electromotive force is used as an anode, and the multiferroic magnetic sensors are connected in series in a homopolar connection manner.

3. The magnetic gradiometer based on the magnetoelectric effect according to claim 2, wherein the multiferroic magnetic sensors are connected through a conductor, or adjacent multiferroic magnetic sensors are connected by sharing a piezoelectric layer.

4. The magnetic gradiometer based on the magnetoelectric effect according to claim 1, 2 or 3, wherein the reading unit includes a signal processing module and a feedback module, an input end of the signal processing module is connected with the multiferroic magnetic sensor, an output end of the signal processing module is connected with an input end of the feedback module, the feedback module generates a feedback magnetic field, and an output end of the signal processing module serves as a signal reading end.

5. A magnetic gradiometer based on the magneto-electric effect according to claim 4, wherein the signal processing module includes at least one amplifier, the input of the amplifier is connected to the multiferroic magnetic sensor, and the output of the amplifier is used as the output of the signal processing module.

6. The magnetic gradiometer based on the magnetoelectric effect according to claim 5, wherein the signal processing module further comprises a low-pass filter, an input end of the low-pass filter is connected with an output end of the amplifier, and an output end of the low-pass filter is used as an output end of the signal processing module.

7. The magnetic gradiometer based on the magnetoelectric effect according to claim 5, wherein the feedback module includes a feedback circuit and a magnetic field generating unit, an input end of the feedback circuit is connected with an output end of the signal processing module, an output end of the feedback circuit is connected with the magnetic field generating unit, and the magnetic field generating unit generates a feedback magnetic field.

8. The magnetic gradiometer based on the magnetoelectric effect according to claim 7, characterized in that the magnetic field generating unit is a coil group, and the coil group is placed within the detection distance of a specific multiferroic magnetic sensor.

9. The magnetic gradiometer based on the magnetoelectric effect according to claim 4, wherein the multiferroic magnetic sensor and the signal processing module are connected through a transformer.

10. The magnetic gradiometer based on the magnetoelectric effect according to claim 1 or 2, characterized by further comprising a plurality of shielding boxes, and the shielding boxes are detachably connected with the multiferroic magnetic sensor.

Technical Field

The invention relates to the field of magnetic field measurement, in particular to a magnetic gradiometer based on a magnetoelectric effect.

Background

The magnetoelectric coupling effect refers to the phenomenon that a material generates electric polarization under the action of an external magnetic field or the material generates magnetization under the action of an external electric field. Therefore, in a material system with both piezoelectric effect and magnetostrictive effect, the change of the external magnetic field can generate an electric signal response through the magnetoelectric coupling effect, and the electric signal response and the amplitude of the external magnetic field have a linear relationship in a certain range. At present, through good shielding treatment, the magnetoelectric material can detect 1.2 x 10 at a resonance frequency^-10An alternating magnetic field of T; the amorphous alloy/PZT fiber array laminated composite material has 10 to a direct current magnetic field by utilizing high magnetic permeability and strong magnetic anisotropy of the amorphous layer^-9Sensitivity of T, and up to 10^-5Angular sensitivity of degrees. The existing research cases show the application prospect of the magnetic field sensor based on the magnetoelectric material in the aspects of navigation and aviation, medical detection, geological exploration, information processing and the like, and the magnetic field sensor has the advantages of high sensitivity, low cost, low power consumption and the like.

The invention as in grant publication No. CN101047225B provides a magnetoelectric coupling device, which includes: two sheets of magnetostrictive material; a piezoelectric device located between and coupled to the two sheets of magnetostrictive material to convert the displacement produced by the magnetostrictive material into an electrical signal; and a holder on which the piezoelectric device and the two sheets of magnetostrictive material are mounted, coupled together.

However, in many cases, a target magnetic field to be detected is often superimposed in an interference magnetic field, and values read in the prior art are all superimposed magnetic fields, so that the target magnetic field cannot be directly read, which brings difficulty to measurement.

Disclosure of Invention

Aiming at the problem that the magnetic field intensity of a target magnetic field cannot be directly obtained from an interference magnetic field in the prior art, the invention provides a magnetic gradiometer based on a magnetoelectric effect.

The technical scheme of the invention is as follows.

The utility model provides a magnetism gradiometer based on magnetoelectric effect, is including reading many ferroic magnetic sensor of unit and a plurality of series connection, reading many ferroic magnetic sensor is connected to the unit input, reads the output of unit and reads the end as the signal, and wherein the relative orientation of putting between every many ferroic magnetic sensor is unanimous. The multiferroic magnetic sensor can generate potential difference after sensing a magnetic field, and the potential difference can be superposed or offset in a series connection mode, for example, when the multiferroic magnetic sensor is placed in different magnetic field environments in series connection in an offset mode, the intensity difference of different magnetic fields can be measured, for example, when the magnetic field to be measured is superposed with other interference magnetic fields, the independent magnetic field intensity of the magnetic field to be measured can be accurately measured at one time in a mode that the multiferroic magnetic sensors are respectively placed in the interference magnetic field and the superposed magnetic field. Wherein, two multiferroic magnetic sensors are connected in series to form a first-order razor, and three multiferroic magnetic sensors are connected in series to form a second-order razor, and so on.

Preferably, the multiferroic magnetic sensor comprises at least one piezoelectric layer and at least one magnetostrictive layer, wherein the end with the lowest working electromotive force is used as a cathode, the end with the highest working electromotive force is used as an anode, and the multiferroic magnetic sensors are connected in series in a homopolar connection mode. Through homopolar connection, the electromotive force of adjacent multiferroic magnetic sensors can be offset, and when the overall value is read, the electromotive force corresponds to the magnetic field intensity difference.

Preferably, the multiferroic magnetic sensors are connected by a conductor, or adjacent multiferroic magnetic sensors are connected by sharing a piezoelectric layer. On the premise of series connection in the homopolar connection mode, different physical connection modes are used, so that the manufacturing cost can be reduced, the manufacturing difficulty is reduced, and the reliability is improved.

Preferably, the reading unit includes a signal processing module and a feedback module, an input end of the signal processing module is connected to the multiferroic magnetic sensor, an output end of the signal processing module is connected to an input end of the feedback module, the feedback module generates a feedback magnetic field, and an output end of the signal processing module serves as a signal reading end. The magnetic field of the selected multiferroic magnetic sensor is compensated through the feedback magnetic field generated by the feedback module, so that the multiferroic magnetic sensor works in a stable linear working interval, and the measurement accuracy is improved.

Preferably, the signal processing module includes at least one amplifier, an input end of the amplifier is connected to the multiferroic magnetic sensor, and an output end of the amplifier is used as an output end of the signal processing module.

Preferably, the signal processing module further includes a low-pass filter, an input end of the low-pass filter is connected to an output end of the amplifier, and an output end of the low-pass filter is used as an output end of the signal processing module.

Preferably, the feedback module comprises a feedback circuit and a magnetic field generating unit, an input end of the feedback circuit is connected with an output end of the signal processing module, an output end of the feedback circuit is connected with the magnetic field generating unit, and the magnetic field generating unit generates a feedback magnetic field. On the basis of the existing feedback circuit, a magnetic field generating unit is connected, the feedback electric signal is converted into magnetic field intensity to be superposed in a specific measured magnetic field, so that the superposed magnetic field is kept stable in the required magnetic field intensity, and the magnetic field generating unit can be any device capable of generating a controllable magnetic field according to the electric signal.

Preferably, the magnetic field generating unit is a coil set, and the coil set is placed within a detection distance of the specific multiferroic magnetic sensor. The coil can generate a magnetic field, and has low cost and simple structure. The magnetic field generation unit may affect any one of the multiferroic magnetic sensors.

Preferably, the multiferroic magnetic sensor and the signal processing module are connected by a transformer.

Preferably, the magnetic sensor also comprises a plurality of shielding boxes, and the shielding boxes are detachably connected with the multiferroic magnetic sensor. The shielding box can temporarily isolate individual multiferroic magnetic sensors, so that the individual multiferroic magnetic sensors do not have potential differences, and the magnetic field intensity difference output finally can be adjusted.

The substantial effects of the invention include: the magnetic field intensity difference value is directly measured through a specific structure and a connection mode, extra calculation is not needed, the measurement is simple and quick, the measured magnetic field is compensated through a feedback mode, the linear working point of the multiferroic magnetic sensor is locked, the linear interval limitation of the multiferroic magnetic sensor is avoided, and the final output voltage signal and the detected magnetic signal are ensured to have an ultra-wide linear working interval.

Drawings

FIG. 1 is a schematic diagram of a first embodiment of the present invention;

FIG. 2 is a schematic view of a second embodiment of the present invention;

FIG. 3 is a schematic view of a third embodiment of the present invention;

FIG. 4 is a diagram illustrating a fourth embodiment of the present invention;

in the figure: the magnetic sensor comprises a first multiferroic magnetic sensor, a second multiferroic magnetic sensor, a 3-signal processing module, a 4-feedback circuit, a 5-magnetic field generating unit and a 6-third multiferroic magnetic sensor.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. In addition, numerous specific details are set forth below in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present invention.

In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present embodiment, "a plurality" means two or more unless otherwise specified.