WO2023115671A1

WO2023115671A1 - Device and method for measuring magnetic parameter of giant magnetostrictive material

Info

Publication number: WO2023115671A1
Application number: PCT/CN2022/072105
Authority: WO
Inventors: 闫向宏; 杨喜峰; 闫世鹏
Original assignee: 中国石油大学(华东)
Priority date: 2021-12-20
Filing date: 2022-01-14
Publication date: 2023-06-29
Also published as: CN114236438A; CN114236438B

Abstract

A device and method for measuring a magnetic parameter of a giant magnetostrictive material. The measurement device comprises an outer magnetic field assembly; the outer magnetic field assembly comprises two magnetic poles (1), and a non-magnetically-conductive pressure container assembly is disposed between the two magnetic poles (1); the non-magnetically-conductive pressure container assembly comprises a sealed non-magnetically-conductive housing (4), constituting a high-temperature and high-pressure container; a giant magnetostrictive element (2) is placed inside the container; a pre-stress application assembly, a temperature control assembly and a pressure control assembly are mounted on the non-magnetically-conductive housing (4), and are respectively used for adjusting pre-stressing force exerted on the giant magnetostrictive element (2), and the temperature and pressure in the high-temperature and high-pressure container; a magnetic parameter detection assembly is mounted on the giant magnetostrictive element (2); the deformation quantity and the surface magnetic field intensity of the giant magnetostrictive element (2) under different external magnetic fields, pre-stressing force, temperatures and pressures are measured, and the measurement for a magnetic parameter of a giant magnetostrictive material having a continuous and adjustable external magnetic field, adjustable bias pre-stressing force, an adjustable temperature field and an adjustable pressure field is realized.

Description

Device and method for measuring magnetic parameters of giant magnetostrictive materials

technical field

The invention relates to the technical field of magnetic measurement, in particular to a measuring device and a measuring method for the magnetic parameters of giant magnetostrictive materials.

Background technique

Giant magnetostrictive materials (GMM) are a class of materials with magnetostrictive properties. Since the emergence of giant magnetostrictive materials, they have attracted widespread attention due to their large magnetostrictive strain under a magnetic field. Giant magnetostrictive materials (GMM) have the characteristics of converting electrical energy into mechanical energy or converting mechanical energy into electrical energy in engineering. Researchers have developed magnetic control actuators, magnetic field sensors, energy conversion, etc. by using its magnetic-force conversion principle. High precision, high energy density components.

The working characteristics of giant magnetostrictive materials are: under the action of alternating magnetic field, the material produces mechanical vibration at the same frequency as the alternating magnetic field. energy device. For example, in the development process of acoustic wave remote transmission technology for measurement while drilling, the generation of low-frequency elastic carrier waves propagating along the drill string requires the use of giant magnetostrictive material transducers to excite.

Under normal temperature and pressure, the mechanical and magnetic properties of giant magnetostrictive materials are very superior. In order to realize the application of giant magnetostrictive materials in different application scenarios, it is necessary to better grasp the temperature of giant magnetostrictive material transducers. field and pressure field, and this must be experimentally measured on the relationship between the magnetic parameters of the giant magnetostrictive material and the temperature field and pressure field in the process of transducer design. Therefore, a device and method for measuring the magnetic parameters of giant magnetostrictive materials with continuously adjustable external magnetic field, adjustable bias prestress, adjustable temperature field, and adjustable pressure field is designed, which is useful for studying the magnetism of magnetostrictive materials. The characteristics and the development of acoustic telemetry technology for data while drilling are very important.

Contents of the invention

In order to solve the above problems, the present invention provides a measuring device and measuring method for the magnetic parameters of giant magnetostrictive materials, which can realize continuous adjustment of the external magnetic field, adjustable bias prestress, adjustable temperature field, and adjustable pressure field The measurement of the magnetic parameters of the giant magnetostrictive material can measure the change law of the magnetic parameter of the giant magnetostrictive material with temperature and pressure under the action of different bias prestress.

In order to achieve the above object, the present invention provides the following technical solutions:

A device for measuring magnetic parameters of giant magnetostrictive materials, comprising: an external magnetic field component, a non-magnetic pressure vessel component, a prestress application component, a magnetic parameter detection component, a temperature control component, a pressure control component and a giant magnetostrictive element;

The external magnetic field assembly includes two magnetic poles, and a non-magnetic pressure vessel assembly is arranged between the two magnetic poles. The non-magnetic pressure container assembly includes a non-magnetic shell, and the non-magnetic shell is sealed to form a high-temperature and high-pressure container. , placing the giant magnetostrictive element inside the container;

A prestress application assembly, a temperature control assembly and a pressure control assembly are installed on the non-magnetic shell, and the prestress application assembly is in contact with the giant magnetostrictive element to adjust the prestress applied to the giant magnetostrictive element. Stress; the temperature control assembly and the pressure control assembly are respectively used to adjust the temperature and pressure in the high temperature and high pressure container;

The magnetic parameter detection component is installed on the giant magnetostrictive element, and is used to detect the deformation amount and surface magnetic field strength of the giant magnetostrictive element under different external magnetic fields, prestress, temperature, and pressure.

In a further technical solution, the external magnetic field component further includes a constant current source, a coil, and a magnetic pole spacing adjustment component, and the constant current source supplies power to the coil to generate an external magnetic field.

In a further technical solution, the giant magnetostrictive element undergoes magnetostriction under the action of the external magnetic field.

In a further technical solution, the external magnetic field assembly realizes the precise adjustment of the external magnetic field by changing the magnitude of the current input to the coil by the constant current source and adjusting the distance between the magnetic poles through the magnetic pole spacing adjustment assembly.

In a further technical solution, the non-magnetic pressure vessel assembly further includes a non-magnetic sample holder, and the non-magnetic sample holder is fixed inside the non-magnetic shell for supporting the magnetic parameter detection assembly And the giant magnetostrictive element.

In a further technical solution, the prestressing assembly includes a prestressing screw and a prestressing display instrument, and the size of the prestress is adjusted by pump pressure, so as to provide the giant magnetostrictive element with an adjustable bias prestress.

In a further technical solution, the temperature control assembly includes a heating device for providing an adjustable temperature field for the giant magnetostrictive material element.

In a further technical solution, the pressure control assembly includes a pressurizing device for providing an adjustable pressure field to the magnetostrictive material element.

In a further technical solution, the magnetic parameter detection device includes a strain gauge sensor and a magnetic field sensor; the strain gauge sensor is installed on the side of the giant magnetostrictive element for detecting the deformation of the giant magnetostrictive element; the magnetic field The sensor is installed between the giant magnetostrictive element and the prestressed screw rod, and is used for measuring the surface magnetic field intensity of the giant magnetostrictive element.

The present invention also discloses a method for measuring the magnetic parameters of giant magnetostrictive materials, which is implemented on the basis of the above-mentioned measuring device for magnetic parameters of giant magnetostrictive materials. The method includes the following steps:

Step 1: Adjust the pump pressure to adjust the prestress applied to the giant magnetostrictive material through the prestress applying component, and display the prestress through the prestress and pressure display instrument;

Step 2: Use a constant current source to supply direct current to the external magnetic field component to make it generate an external magnetic field, apply a certain magnetic field strength to the giant magnetostrictive element to make the giant magnetostrictive element stretch and deform, and record the external magnetic field B at this time;

Step 3: Measure the magnetic induction intensity H on the surface of the giant magnetostrictive element through a magnetic field sensor installed on the surface of the magnetostrictive material;

Step 4: Connect the strain gauge sensor installed on the side of the giant magnetostrictive element to the strain gauge, and measure the deformation of the giant magnetostrictive element through the strain gauge sensor;

Step 5: Record the above-mentioned measured bias stress, external magnetic field B, surface magnetic field strength H of the giant magnetostrictive element, and the data measured on the strain gauge;

Step 6: Change the current magnitude of the direct current, and repeat the above steps 1 to 5 in sequence.

Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

The invention provides a temperature characteristic and pressure characteristic test device for the magnetic parameters of giant magnetostrictive materials. The device has the advantages of continuously adjustable external magnetic field, adjustable bias prestress, adjustable temperature field, and adjustable pressure field. , can measure giant magnetostrictive material under the action of different bias prestressing magnetic parameters of giant magnetostrictive material change law with temperature and pressure.

The invention can realize the change curve of the magnetic parameters of the giant magnetostrictive smart material with the temperature field and the pressure field under different bias stresses, including the relationship between the B-H curve and temperature and pressure, and the relationship between the S-H curve and the temperature The relationship between pressure and pressure; under a certain bias magnetic field, different stresses are applied to measure the magnetic induction of the magnetostrictive material rod, and the relationship between the B-T curve and temperature and pressure is obtained.

Description of drawings

The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention.

FIG. 1 is a schematic structural diagram of a device for measuring magnetic parameters of giant magnetostrictive materials in Embodiment 1 of the present invention.

Among them, 1 magnetic pole, 2 giant magnetostrictive element, 3 prestressed screw, 4 non-magnetic shell, 5 non-magnetic sample holder, 6 strain gauge sensor, 7 magnetic field sensor, 8 temperature measuring device, 9 pressurizing device, 10 Heating device, 11 wire connector, 12 constant current source, 13 coil, 14 pressure display instrument, 15 prestress display instrument, 16 magnetic pole spacing adjustment component.

Detailed ways

The present disclosure will be further described below in conjunction with the accompanying drawings and embodiments.

It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present disclosure. Unless defined otherwise, all technical and scientific terms used in this disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

Embodiment one

The invention discloses a device for measuring magnetic parameters of giant magnetostrictive materials. The device has the advantages of continuously adjustable external magnetic field, adjustable bias prestress, adjustable temperature field, and adjustable pressure field, and can measure super Variation of magnetic parameters of giant magnetostrictive materials with temperature and pressure under different bias prestress.

Fig. 1 is a structural schematic diagram of a measuring device for magnetic parameters of a giant magnetostrictive material according to the present invention. As shown in Figure 1, this embodiment discloses a device for measuring the magnetic parameters of giant magnetostrictive materials, including: an external magnetic field assembly, a non-magnetic pressure vessel assembly, a prestress application assembly, a magnetic parameter detection assembly, a temperature Control components, pressure control components and giant magnetostrictive elements.

The external magnetic field assembly includes two magnetic poles 1, a non-magnetic pressure vessel assembly is arranged between the two magnetic poles 1, the non-magnetic pressure vessel assembly includes a non-magnetic shell 4, and the non-magnetic shell 4 is sealed, A high-temperature and high-pressure container is formed to maintain the pressure and temperature required for the experiment while reducing the influence of the container material on the magnetic field in the sample. The giant magnetostrictive element 2 is placed inside the container.

A prestressing assembly, a temperature control assembly and a pressure control assembly are installed on the non-magnetic shell 4, and the prestressing assembly is in contact with the giant magnetostrictive element 2, and the adjustment is applied to the giant magnetostrictive element 2. The prestress on the upper; the temperature control assembly and the pressure control assembly are used to adjust the temperature and pressure in the high-temperature and high-pressure container respectively.

The magnetic parameter detection component is installed on the giant magnetostrictive element 2, and is used to detect the deformation and surface magnetic field strength of the giant magnetostrictive element under different external magnetic fields, prestress, temperature, and pressure.

The external magnetic field component also includes a constant current source 12 , a coil 13 and a magnetic pole spacing adjustment component 16 , and the coil 13 is powered by the constant current source 12 to generate an external magnetic field.

In this embodiment, the coils 13 are respectively wound on the two magnetic poles 1 , and the constant current source 12 supplies power to the coils 13 to generate an external magnetic field.

The magnetic pole spacing adjustment assembly 16 includes a knob, which is installed at one end of the magnetic pole 1, and the distance between the two magnetic poles 1 can be adjusted by turning the knob.

The external magnetic field component realizes precise adjustment of the external magnetic field by changing the magnitude of the current input from the constant current source 12 to the coil 13 .

Further, the external magnetic field assembly realizes precise adjustment of the external magnetic field by changing the magnitude of the current input by the constant current source 12 to the coil 13 and by adjusting the distance between the magnetic poles through the magnetic pole spacing adjustment assembly 16 .

The giant magnetostrictive element 2 undergoes magnetostriction under the action of the external magnetic field.

The non-magnetic pressure vessel assembly also includes a non-magnetic sample holder 5, which is fixed inside the non-magnetic shell 4 for supporting the magnetic parameter detection component and the supermagnetic Telescopic element 2.

One end opening of the non-magnetic shell 4 is convenient for installing or unloading giant magnetostrictive element experimental samples, magnetic field sensors and strain gauge sensors, and sealing is realized by fixing the cover plate on the open end of the non-magnetic shell 4 .

Wire connectors 11 are hermetically installed on the side of the non-magnetic shell 4 to facilitate the extraction of sensor signals and measurement signals inside the non-magnetic shell 4 .

The prestressing assembly includes a prestressing screw 3 and a prestressing display instrument 15, which can adjust the size of the prestress by pump pressure, and is used to provide the giant magnetostrictive element with an adjustable bias prestress. The giant magnetostrictive element is located in the driving coil assembly, that is, the giant magnetostrictive element is located in an external magnetic field, and under the action of bias prestress, axial magnetostrictive strain occurs along the bracket.

In this embodiment, the prestressed screw 3 is fixed on the cover plate of the non-magnetic shell 4 through the flange. Preferably, the flange is provided with an O-ring to ensure the sealing of the non-magnetic shell.

One side of the prestressed screw 3 is in contact with the giant magnetostrictive element 2, the other side of the prestressed screw 3 is connected to a pressure pump through a pipeline, and the pressure is applied to the prestressed screw 3 by the pressure pump, so that the prestressed The screw 3 moves to the left, and then applies prestress to the giant magnetostrictive element 2 through the prestress screw 3, and the size of the prestress can be controlled by adjusting the pump pressure of the pressure pump.

The prestress display instrument 15 is connected to the prestress screw 3 for displaying the magnitude of the prestress applied by the pressure pump. In this embodiment, the prestressing indicator 15 is connected to the prestressing screw 3 through a pipeline.

The temperature control assembly includes a heating device 10 for providing an adjustable temperature field for the giant magnetostrictive material element; the temperature control assembly also includes a temperature measuring device 8 for detecting the temperature inside the non-magnetic shell.

In this embodiment, the heating device 10 is externally connected to a 220V AC power source to realize temperature regulation inside the sealed non-magnetic shell 4 .

The temperature measuring device 8 is a temperature sensor, and the temperature sensor is sealed and installed on the non-magnetic shell 4; the temperature sensor is connected to the wire connector 11 through a wire inside the non-magnetic shell 4, and the wire The connector 11 is externally connected with a temperature display instrument to realize real-time display of the internal temperature of the non-magnetic shell 4 .

The pressure control assembly includes a pressurizing device 9, which is used to provide an adjustable pressure field for the giant magnetostrictive material element; the pressurizing device includes a pressure pump, and the inside of the sealed non-magnetic shell 4 is realized by adjusting the pump pressure pressure regulation.

In this embodiment, the pressure pump is connected to the non-magnetic shell 4 through a pipeline, and the pressure pump applies pressure to the inside of the non-magnetic shell 4 to adjust the pressure inside the high-temperature and high-pressure container.

The pressure control assembly also includes a pressure display instrument 14 , which is connected to the pressurizing device, and the pressure display instrument 14 displays the pressure inside the sealed non-magnetic shell 4 .

In this embodiment, the temperature control component and the pressure control component are used to provide different temperature fields and different pressure fields in the high-temperature and high-pressure container constituted by the non-magnetic shell 4 .

Described magnetic parameter detecting device comprises strain gauge sensor 6 and magnetic field sensor 7; Described strain gauge sensor 6 is installed on the side of giant magnetostrictive element 2, is used for detecting the amount of deformation of giant magnetostrictive element 2; The magnetic field The sensor 7 is installed between the giant magnetostrictive element 2 and the prestressed screw 3 for measuring the surface magnetic field intensity of the giant magnetostrictive element 2 .

Preferably, the magnetic field sensor 7 has an automatic temperature correction function.

The magnetic parameter detection device is used to detect the deformation amount of the giant magnetostrictive element and the magnetic field intensity on the surface of the giant magnetostrictive element, and the detection signal is connected to the corresponding measuring instrument through the wire connector 11 .

In this embodiment, a certain temperature field and pressure field are provided for the giant magnetostrictive material through the temperature control system and the pressure regulation system, and then the prestress applying component is adjusted to apply different bias prestress to the giant magnetostrictive element, Change the current in the drive coil to generate an external magnetic field so that the giant magnetostrictive element in the magnetic field undergoes stretching strain, and the deformation of the giant magnetostrictive element and the magnetic field strength generated on the surface of the giant magnetostrictive element are respectively measured through the detection component. Thus the magnetization B-H curve and the magnetostriction S-H curve (the curve between the strain of the rod and the applied magnetic field) of the magnetostrictive material are measured.

In this embodiment, the strain gauge sensor used to detect the deformation of the giant magnetostrictive element is a resistive strain gauge, and the magnetic field sensor used to detect the intensity of the magnetic field generated on the surface of the giant magnetostrictive element is a Hall chip. The resistance strain gauge is pasted on the side of the cylindrical rod-type giant magnetostrictive element, and the Hall chip is located on the end face of the giant magnetostrictive element, and is used to measure the surface magnetic field after magnetization of the giant magnetostrictive material.

In this embodiment, the strain gauge pasted on the surface of the giant magnetostrictive element can measure the amount of deformation of the giant magnetostrictive element, the prestress application component displays the applied bias stress through the pressure gauge, and the Hall chip can Measure the magnetic field intensity generated on the surface of the giant magnetostrictive element. Through the above device, the giant magnetostrictive element can be statically measured, that is, under a certain bias magnetic field, different stresses are applied, and the magnetic induction intensity of the magnetostrictive material rod at different temperatures and pressures is measured, and a certain temperature and pressure are obtained. The curve between the magnetic induction intensity, the applied stress and the magnetostriction.

Embodiment two

The invention also discloses a method for measuring the magnetic parameters of the giant magnetostrictive material. On the basis of the above-mentioned measuring device for the magnetic parameter of the giant magnetostrictive material, the giant magnetostrictive material under the action of different bias prestresses can be realized. Detection of magnetostrictive properties changing with temperature and pressure.

A method for measuring the magnetic parameters of giant magnetostrictive materials, comprising the following steps:

Step 1: adjusting the magnitude of the applied bias stress through the stress applying component;

Step 2: keep the temperature field and pressure field constant;

Step 3: Supply direct current to the coil assembly to make it generate a stable magnetic field, and the giant magnetostrictive element will stretch and deform when a certain magnetic field strength is applied;

Step 4: measure the magnetostrictive strain through the strain gauge installed on the side of the giant magnetostrictive element;

Step 5: Keep the pressure field constant, change the temperature field, repeat the above steps 1 to 4 in turn, and measure the variation law of the magnetostriction curve with the temperature field;

Step 6: Keep the temperature field constant, adjust the pressure field, repeat the above steps 1 to 4 in turn, and measure the change rule of the magnetostriction curve with the pressure field.

Embodiment Three

The invention also discloses a method for measuring the magnetic parameters of the giant magnetostrictive material. On the basis of the above-mentioned measuring device for the magnetic parameter of the giant magnetostrictive material, the giant magnetostrictive material under the action of different bias prestresses can be realized. Detection of magnetostrictive properties changing with temperature field and pressure field.

Step 2: keep the temperature field and pressure field constant;

Step 3: Supply DC power to the coil assembly to generate a stable magnetic field, and the giant magnetostrictive element is magnetized in the external magnetic field;

Step 4: measuring the surface magnetic field of the giant magnetostrictive material through a Hall element installed on the end face of the giant magnetostrictive element;

Step 5: Adjust the current and change the external magnetic field;

Step 6: Keep the pressure field constant, change the temperature field, repeat the above steps 1 to 5 in turn, and measure the variation law of the magnetization curve with the temperature field;

Step 7: Keep the temperature field constant, adjust the pressure field, and repeat the above steps 1 to 5 in turn, and the change law of the magnetization curve with the pressure field can be measured.

Using the above-mentioned measuring device and measuring method, the present invention can test giant magnetostrictive smart materials, such as iron gallium alloy Galfenol, giant magnetostrictive material Terfenol-D, magnetostrictive shape memory alloy, under different bias stresses etc., measured the variation curves of its magnetic parameters with the temperature field and pressure field, including the relationship between the B-H curve and temperature and pressure (the curve between the magnetic induction of the rod and the applied magnetic field), and the relationship between the S-H curve and temperature and pressure. relationship (the curve between the strain of the rod and the applied magnetic field); under a certain bias magnetic field, different stresses are applied to measure the magnetic induction of the magnetostrictive material rod, and the relationship between the B-T curve and temperature and pressure (the magnetic induction and curves between applied stresses).

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present invention.

Claims

A device for measuring magnetic parameters of giant magnetostrictive materials, characterized in that it includes: an external magnetic field component, a non-magnetic pressure vessel component, a prestress application component, a magnetic parameter detection component, a temperature control component, a pressure control component and giant magnetostrictive element;

The external magnetic field assembly includes two magnetic poles, and a non-magnetic pressure vessel assembly is arranged between the two magnetic poles. The non-magnetic pressure container assembly includes a non-magnetic shell, and the non-magnetic shell is sealed to form a high-temperature and high-pressure container. , placing the giant magnetostrictive element inside the container;

A prestress application assembly, a temperature control assembly and a pressure control assembly are installed on the non-magnetic shell, and the prestress application assembly is in contact with the giant magnetostrictive element to adjust the prestress applied to the giant magnetostrictive element. Stress; the temperature control assembly and the pressure control assembly are respectively used to adjust the temperature and pressure in the high temperature and high pressure container;

The magnetic parameter detection component is installed on the giant magnetostrictive element, and is used to detect the deformation amount and surface magnetic field strength of the giant magnetostrictive element under different external magnetic fields, prestress, temperature, and pressure.
The measuring device of the magnetic parameter of giant magnetostrictive material as claimed in claim 1, it is characterized in that, described external magnetic field assembly also comprises constant current source, coil and magnetic pole pitch adjustment assembly, through described constant current source to described The coil is powered and an applied magnetic field is generated.
The device for measuring magnetic parameters of a giant magnetostrictive material according to claim 2, wherein the giant magnetostrictive element undergoes magnetostriction under the action of the external magnetic field.
The measuring device of the magnetic parameter of giant magnetostrictive material as claimed in claim 2, it is characterized in that, described external magnetic field component is by changing the size of the electric current that constant current source inputs coil and adjusts the distance between magnetic poles by magnetic pole spacing adjusting component distance to achieve precise adjustment of the size of the external magnetic field.
The device for measuring the magnetic parameters of giant magnetostrictive materials according to claim 1, wherein the non-magnetic pressure vessel assembly also includes a non-magnetic sample holder, and the non-magnetic sample holder is fixed on the The inside of the non-magnetic shell is used to support the magnetic parameter detection assembly and the giant magnetostrictive element.
The device for measuring the magnetic parameters of giant magnetostrictive materials as claimed in claim 1, wherein the prestress application assembly includes a prestress screw and a prestress display instrument, and the prestress size is adjusted by pump pressure for giving The giant magnetostrictive element provides an adjustable bias prestress.
The device for measuring the magnetic parameters of the giant magnetostrictive material according to claim 1, wherein the temperature control component includes a heating device for providing a temperature-adjustable temperature field for the giant magnetostrictive material element.
The device for measuring magnetic parameters of giant magnetostrictive materials according to claim 1, wherein the pressure control assembly includes a pressurizing device for providing a pressure field with adjustable pressure to the magnetostrictive material element.
The measuring device of the magnetic parameter of giant magnetostrictive material as claimed in claim 1, is characterized in that, described magnetic parameter detecting device comprises strain gauge sensor and magnetic field sensor;

The strain gauge sensor is installed on the side of the giant magnetostrictive element for detecting the amount of deformation of the giant magnetostrictive element;

The magnetic field sensor is installed between the giant magnetostrictive element and the prestressed screw rod, and is used for measuring the surface magnetic field intensity of the giant magnetostrictive element.
A method for measuring the magnetic parameters of a giant magnetostrictive material, characterized in that it comprises the following steps:

Step 1: Adjust the pump pressure to adjust the prestress applied to the giant magnetostrictive material through the prestress applying component, and display the prestress through the prestress and pressure display instrument;

Step 2: Use a constant current source to supply direct current to the external magnetic field components to make it generate a stable magnetic field, apply a certain magnetic field strength to the giant magnetostrictive element to make the giant magnetostrictive element stretch and deform, and record the external magnetic field B at this time ;

Step 3: Measure the magnetic induction intensity H on the surface of the giant magnetostrictive element through a magnetic field sensor installed on the surface of the magnetostrictive material;

Step 4: Connect the strain gauge sensor installed on the side of the giant magnetostrictive element to the strain gauge, and measure the deformation of the giant magnetostrictive element through the strain gauge sensor;

Step 5: Record the above-mentioned measured bias stress, external magnetic field B, surface magnetic field strength H of the giant magnetostrictive element, and the data measured on the strain gauge;

Step 6: Change the current magnitude of the direct current, and repeat the above steps 1 to 5 in sequence.