阅读说明：本技术 一种用于交流磁化率测试的低温插件 (Low-temperature plug-in for alternating current magnetic susceptibility test ) 是由 王凡 黄社松 刘云 杨威 冯长沙 于 2020-12-17 设计创作，主要内容包括：一种用于交流磁化率测试的低温插件,包括接线盒、样品管、样品杆和保护罩,其特征在于：所述接线盒、样品管、保护罩均为能够容纳样品杆的中空结构,且自上而下依次连接；所述保护罩中设置有线圈组,所述线圈组包括激励线圈和次级线圈,所述激励线圈和次级线圈分别缠绕于两个线圈固定器上,构成同心筒状结构,且所述激励线圈位于所述次级线圈的外层；所述接线盒外壁上设置有电学接头,用于经由电学引线连接所述线圈组。基于本发明的技术方案,简化了低温插件的制作过程和维护更换成本,同时减小误差,测试结果准确。(The utility model provides a low temperature plug-in components for exchanging magnetic susceptibility test, includes terminal box, sample cell, sample pole and safety cover, its characterized in that: the junction box, the sample tube and the protective cover are all hollow structures capable of accommodating the sample rod and are sequentially connected from top to bottom; the protective cover is internally provided with a coil group, the coil group comprises an excitation coil and a secondary coil, the excitation coil and the secondary coil are respectively wound on the two coil holders to form a concentric cylindrical structure, and the excitation coil is positioned on the outer layer of the secondary coil; and the outer wall of the junction box is provided with an electrical connector which is used for connecting the coil assembly through an electrical lead. Based on the technical scheme of the invention, the manufacturing process and the maintenance and replacement cost of the low-temperature plug-in are simplified, meanwhile, the error is reduced, and the test result is accurate.)

1. A cryogenic insert for AC susceptibility testing, comprising a junction box (1), a sample tube (8), a sample rod (9) and a protective cover (10), characterized in that:

the junction box (1), the sample tube (8) and the protective cover (10) are all hollow structures capable of accommodating the sample rod (9) and are sequentially connected from top to bottom;

a coil group (13) is arranged in the protective cover (10), the coil group (13) comprises an excitation coil (14) and a secondary coil (15), the excitation coil (14) and the secondary coil (15) are respectively wound on two coil holders to form a concentric cylindrical structure, and the excitation coil (14) is positioned on the outer layer of the secondary coil (15);

and an electrical connector (4) is arranged on the outer wall of the junction box (1) and is used for connecting the coil assembly (13) through an electrical lead (17).

2. A cryogenic insert for ac magnetic susceptibility testing as claimed in claim 1, wherein:

the secondary coil comprises a first secondary coil (15) and a second secondary coil (16), and the first secondary coil (15) and the second secondary coil (16) are wound by a conducting wire in a reverse symmetrical mode.

3. A cryogenic insert for ac susceptibility testing as claimed in claim 2, wherein:

the number of winding turns of the first secondary coil (15) and the second secondary coil (16) is the same as the coil pitch per turn; and the number of the first and second electrodes,

the coil fixer is made of G10 material.

4. A cryogenic insert for ac magnetic susceptibility testing as claimed in claim 1, wherein:

the electrical connector is a power plug or a PC terminal adapter.

5. A cryogenic insert for ac magnetic susceptibility testing as claimed in claim 1, wherein:

the sample inlet (2) with the cover is arranged at the top of the junction box (1), the linear displacement manipulator (3) is arranged inside the junction box (1) and used for fixing the top of the sample rod (9), a sample to be detected is loaded at the bottom of the sample rod (9), and the sample rod (9) is driven to move or be positioned based on operation control of control software.

6. A cryogenic insert for AC susceptibility testing as claimed in claim 5, wherein:

the linear displacement manipulator (3) is connected with a power plug and a PC end adapter through an electrical lead (17), and the PC end adapter is connected with PC end equipment with built-in control software.

7. A cryogenic insert for AC susceptibility testing as claimed in claim 5, wherein:

the sample tube (8) is made of high-polishing stainless steel, and the sample rod (9) is a solid columnar rod made of graphite fibers.

8. A cryogenic insert for AC susceptibility testing as claimed in claim 5, wherein:

the sample rod (9) upper portion is provided with a plurality of heat radiation protection baffle (7) with equidistant, heat radiation protection baffle (7) are the disk of high polishing stainless steel material.

9. A cryogenic insert for ac magnetic susceptibility testing as claimed in claim 1, wherein:

the protective cover (10) comprises a protective cover outer layer (11) and a protective cover inner layer (12) which are of concentric cylindrical structures, the protective cover outer layer (11) is made of G10 materials, and the protective cover inner layer (12) is made of sapphire materials.

10. A cryogenic insert for ac magnetic susceptibility testing as claimed in claim 1, wherein:

a thermometer (18) and a heater (19) are arranged at the bottom of the inner layer of the protective cover (10), and the thermometer (18) and the heater (19) are respectively connected with a temperature controller through an electrical lead (17) and an electrical connector (4);

the heater (19) is a resistance type heater;

the thermometer (18) is a low-temperature thermometer, and the temperature curve of the thermometer is independent of the magnetic field;

preferably, the electric lead (17) of the thermometer (18) is a phosphor bronze wire, the electric lead (17) of the heater (19) is a pure copper wire, and the electric lead (17) of the coil set is a flexible microwave coaxial cable.

Technical Field

The invention relates to the technical field of low-temperature sample testing, in particular to a low-temperature plug-in for alternating current magnetic susceptibility testing.

Background

At present, the alternating magnetic susceptibility has been widely used in the physics of condensed state as an important physical property measurement means. Especially when the alternating magnetic susceptibility is used for characterizing the magnetic information of the sample, the method has accurate characterization characteristics. The alternating current magnetic susceptibility refers to the slope of a magnetization curve, is a differential form dM/dH of the magnetization intensity and the magnetic field intensity, and measures the response of a material to be measured to perturbation through small alternating current perturbation superposed under a large direct current magnetic field. In general, when a superconducting material, a magnetic material, or the like is measured, a change in ac susceptibility characteristic of the material with temperature is taken into consideration, and the phase transition temperature of the magnetic material is obtained based on the change. The material to be measured is measured through the alternating-current magnetic susceptibility, the influence on the material property in the measuring process can be reduced as much as possible, meanwhile, the disturbance in the measuring process is small, the measuring process can be implemented under various external conditions, various phase diagrams of the material under different conditions are effectively obtained, and the material property is better understood.

In the prior art, an alternating current magnetic susceptibility test plug is generally used for testing a sample to be tested. The exciting coil in the test plug-in generates a changing magnetic field under the exciting action of the current source, and accordingly influences the magnetization intensity of the sample to be tested positioned in the exciting coil, so that the magnetic field intensity of the sample to be tested is changed, and induced electromotive force is generated in the secondary coil. By measuring the induced electromotive force, the magnetization and magnetic susceptibility of the material can be obtained. However, in the ac susceptibility test card in the prior art, the excitation coil and the secondary coil in the coil assembly are usually wound on the same coil holder, which is complicated in manufacturing process and difficult to replace and maintain. In addition, the sample rod loading the sample to be measured is easy to deform in the moving process, so that the sample is shaken, and induced electromotive force generated by the secondary coil is influenced.

Therefore, a new low temperature insert for ac susceptibility testing is needed.

Disclosure of Invention

In order to solve the defects in the prior art, the invention aims to provide a low-temperature plug-in for testing alternating-current magnetic susceptibility, which simplifies the manufacturing process and the maintenance and replacement cost by separately winding an excitation coil and a secondary coil.

The invention adopts the following technical scheme. A low-temperature plug-in for alternating current magnetic susceptibility testing comprises a junction box 1, a sample tube 8, a sample rod 9 and a protective cover 10, wherein the junction box 1, the sample tube 8 and the protective cover 10 are all hollow structures capable of accommodating the sample rod 9 and are sequentially connected from top to bottom; a coil group 13 is arranged in the protective cover 10, the coil group 13 comprises an excitation coil 14 and a secondary coil, the excitation coil 14 and the secondary coil are respectively wound on the two coil holders to form a concentric cylindrical structure, and the excitation coil 14 is positioned on the outer layer of the secondary coil; an electrical connector 4 is provided on the outer wall of the terminal block 1 for connection of the coil assembly 13 via an electrical lead 17.

Preferably, the secondary coil includes a first secondary coil 15 and a second secondary coil 16, and the first secondary coil 15 and the second secondary coil 16 are reversely and symmetrically wound by using one conductive wire.

Preferably, the number of winding turns of the first secondary coil 15 and the second secondary coil 16 is the same as the coil pitch per turn; the coil holder is made of G10 material.

Preferably, the electrical connector is a power plug or a PC terminal adapter.

Preferably, the top of the junction box 1 is provided with a sample inlet 2 with a cover, the interior of the junction box 1 is provided with a linear displacement manipulator 3 for fixing the top of the sample rod 9, the bottom of the sample rod 9 is loaded with a sample to be measured, and the sample rod 9 is driven to move or be positioned based on the operation control of control software.

Preferably, the linear displacement operator 3 is connected to a power plug and a PC terminal adapter, respectively, via electrical leads 17, the PC terminal adapter being connected to a PC terminal device having control software built therein.

Preferably, the sample tube 8 is made of high-polishing stainless steel, and the sample rod 9 is a solid cylindrical rod made of graphite fiber.

Preferably, a plurality of heat radiation prevention baffles 7 are arranged on the upper part of the sample rod 9 at equal intervals, and the heat radiation prevention baffles 7 are round pieces of high-polishing stainless steel.

Preferably, the protective cover 10 comprises a protective cover outer layer 11 and a protective cover inner layer 12 which are concentric cylindrical structures, wherein the protective cover outer layer 11 is made of G10 material, and the protective cover inner layer 12 is made of sapphire material.

Preferably, a thermometer 18 and a heater 19 are arranged at the bottom of the inner layer of the protective cover 10, and the thermometer 18 and the heater 19 are respectively connected with a temperature controller through an electric lead 17 and an electric connector 4; the heater 19 is a resistance type heater; the thermometer 18 is a low temperature thermometer, the temperature curve of which is independent of the magnetic field;

preferably, the electrical lead 17 of the thermometer 18 is a phosphor bronze wire, the electrical lead 17 of the heater 19 is a pure copper wire, and the electrical lead 17 of the coil assembly is a flexible microwave coaxial cable.

Compared with the prior art, the low-temperature plug-in for testing the alternating-current magnetic susceptibility has the beneficial effects that the manufacturing process and the maintenance and replacement cost are simplified by independently winding the exciting coil and the secondary coil.

The beneficial effects of the invention also include:

1. two secondary coils wound in opposite directions are arranged, and samples are respectively placed at the same positions of the two secondary coils for testing respectively, so that system errors caused by the fact that induced electromotive force generated by the secondary coils in the manufacturing process is inconsistent with design expectation are eliminated.

2. The sample rod, the protective cover and the electrical lead are made of special materials, so that systematic errors in the sample measurement process are reduced in various aspects of preventing the sample from shaking, preventing environmental interference and the like.

3. The test temperature of the sample is controlled by the built-in thermometer, the heater and the external temperature controller, so that the sample is tested in a constant temperature environment.

Drawings

FIG. 1 is a front view of the overall construction of a cryogenic insert for AC susceptibility testing in accordance with the present invention;

FIG. 2 is a polished view of a protective shield in a cryogenic insert for AC susceptibility testing according to the present invention.

Reference numerals:

1-junction box

2-sample entry

3-Linear Displacement manipulator

4-Electrical connector 1

5-Electrical connector 2

6-Electrical connector 3

7-thermal radiation protection baffle

8-sample tube

9-sample rod

10-protective cover

11-protective cover outer layer

12-inner layer of protective cover

13-coil assembly

14-exciting coil

15-first secondary coil

16-second secondary coil

17-electrical lead

18-thermometer

19-Heater

Detailed Description

The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.

FIG. 1 is a front view of the overall structure of a cryogenic insert for AC susceptibility testing according to the present invention. FIG. 2 is a polished view of a protective shield in a cryogenic insert for AC susceptibility testing according to the present invention. As shown in fig. 1 and 2, a cryogenic insert for ac magnetic susceptibility testing includes a junction box 1, a sample tube 8, a sample rod 9 and a protective cover 10.

The junction box 1, the sample tube 8 and the protective cover 10 are all hollow structures capable of accommodating the sample rod 9 and are sequentially connected from top to bottom. The protective cover 10 is provided with a coil group 13, the coil group 13 comprises an excitation coil 14 and secondary coils 15 and 16, the excitation coil 14 and the secondary coils 15 and 16 are respectively wound on two coil holders to form a concentric cylindrical structure, and the excitation coil 14 is positioned on the outer layers of the secondary coils 15 and 16. An electrical connector 4 is provided on the outer wall of the terminal block 1 for connection of the coil assembly 13 via an electrical lead 17.

In one embodiment of the present invention, the sample is located at the bottom of the sample rod 9, the upper portion of the sample rod is located in the terminal box 1, the exciting coil 14 inside the protective cover 10 is driven by a current source to generate a magnetic field, so that the sample has magnetic characteristics, thereby inducing the secondary coils 15 and 16 to generate induced electromotive force, and the induced electromotive force is measured through the electrical lead 17 and an external testing device. By analyzing the induced electromotive force data, the attribute of the test sample can be obtained.

Because the exciting coil 14 and the secondary coil 15 or 16 in the coil group 13 adopt a method of independent winding and recombination, the manufacturing method of the coil and the low-temperature plug-in can be simple, and the replacement and maintenance are convenient.

Preferably, the secondary coil includes a first secondary coil 15 and a second secondary coil 16, and the first secondary coil 15 and the second secondary coil 16 are reversely and symmetrically wound by using one conductive wire. Generally, the same wire can be used to wind in two parts on a coil holder, and the winding directions of the two parts are opposite. Because the winding directions of the two secondary coils are opposite, and meanwhile, a test method of two positions of the sample can be adopted, so that the sample can be respectively tested in the corresponding positions of the two secondary coils, and the induced electromotive forces generated by the two secondary coils can be respectively and accurately obtained, thereby eliminating system errors.

Preferably, the number of winding turns of the first secondary coil 15 and the second secondary coil 16 is the same as the coil pitch per turn; the coil holder is made of G10 material.

The G10 material is a composite material synthesized by glass fiber cloth and epoxy resin, has no magnetism, and does not generate an interference magnetic field in the sample testing process. In addition, the material is not easy to deform, is not easy to be permeated by water vapor and liquid, has the characteristics of insulation, acid and alkali resistance, and is small in density and light in weight. Therefore, the coil fixer made of the G10 material is easy to maintain and preserve, long in service life and high in measurement accuracy.

Preferably, the electrical connectors 4-6 may be power plugs or PC terminal connectors. The electrical connections 4-6 can be connected not only to the individual coils in the coil assembly by means of electrical leads 17, but also to other electrical devices inside or outside the test insert. For example, when the insert is internally provided with a linear displacement operator, a thermometer, a heater, and the like, and externally provided with a temperature controller, a PC device, the devices may be connected thereto through electrical connectors. In addition, in order to implement different functions, such as power supply, operation of the control operator, and the like, different electrical plugs, such as power plugs or PC terminals, need to be installed, so that the electrical connectors are matched with various components.

Preferably, the top of the junction box 1 is provided with a sample inlet 2 with a cover for inserting the sample rod 9 into the interior of the sample tube. When the cryoinserts are to be put into operation, they can first be inserted into the sample chambers of the existing cryodevices and fixed. However, the sample is loaded to the bottom of the sample rod 9, the cover of the sample inlet 2 at the top of the junction box 1 is opened, and the sample rod 9 is inserted into the sample tube 8. The cover of the sample inlet 2 may be tightened after the top end of the sample rod is secured to the linear displacement manipulator.

The terminal box 1 is internally provided with a linear displacement manipulator 3 for fixing the top of the sample rod 9, the bottom of the sample rod 9 is loaded with a sample to be tested, and the sample rod 9 is driven to move or be positioned based on the operation control of control software. The linear displacement operator 3 is connected with a power plug and a PC terminal adapter through an electrical lead 17 respectively, and the PC terminal adapter is connected with PC terminal equipment with built-in control software.

It should be noted that, a controller and an encoder are provided in the linear displacement operator 3, and the linear displacement of the linear displacement operator can be controlled by control software. The linear displacement operator is connected to the plug-in power line via a power plug, so that the linear displacement operator 3 is supplied with power. And the linear displacement operator 3 is accessed into PC end equipment through a PC end adapter. The PC-side device may have control software built therein, and the control software controls the linear displacement operator 3 to perform linear displacement or be in a fixed state. Generally, under the control of control software, the linear displacement operator 3 will drive the operating rod 9 to perform fast and precise movement and positioning in the concentric axial direction of the sample tube 8, the protective cover 10 and the coil assembly 13, so that the measurement result of the measurement plug-in is more accurate, and the measurement process is quicker.

Preferably, the sample tube 8 is made of a highly polished stainless steel material, and the highly polished stainless steel has relatively poor heat conduction performance, so that heat leakage caused by the environment temperature to the test plug-in can be effectively reduced, and the overhigh temperature of the sample end is avoided. The sample rod 9 is a solid cylindrical rod made of graphite fibers. The graphite fiber has the characteristics of light weight and no deformation, can be used as a sample rod to accurately and easily place a sample to be measured at a measuring position, and cannot cause the sample to be measured to shake in the process of moving the rod, so that the electromotive force generated by the secondary coil can be stably and inerrably measured.

Preferably, a plurality of heat radiation protection baffles 7 are arranged on the upper part of the sample rod 9 at equal intervals, the heat radiation protection baffles 7 are round pieces of high-polishing stainless steel, and the heat radiation protection baffles 7 can be used for reducing heat radiation from the top of the sample tube and limiting air convection in the environment of the sample tube so as to ensure that the sample obtains the lowest temperature possible. The electrical lead 17 is thermally anchored to the sample tube 8.

Preferably, the protective cover 10 comprises a protective cover outer layer 11 and a protective cover inner layer 12 which are concentric cylindrical structures, wherein the protective cover outer layer 11 is made of G10 material, and the protective cover inner layer 12 is made of sapphire material.

The protection cover comprises two-layer different materials's concentric tubular structure, can provide no magnetism, the even sample environment of temperature for the sample that awaits measuring. The outer layer of the protective cover is made of G10 material and is nonmagnetic, the inner layer of the protective cover is made of sapphire, and the protective cover has excellent heat conduction capability and provides an isothermal zone for samples.

Preferably, a thermometer 18 and a heater 19 are arranged on the bottom of the inner layer of the protective cover 10, and the thermometer 18 and the heater 19 are respectively connected with a temperature controller arranged outside the insert through an electric lead 17 and an electric connector 4. Wherein the thermometer is used for monitoring the temperature of the area near the sample in real time, and the temperature curve generated by the thermometer is independent of the magnetic field. The heater 19 may be a resistive type heater that can be used to heat the sample to varying degrees. In addition, the heater 19 can also cooperate with the thermometer 18 and the temperature controller to control and change the temperature of the sample.

Before the sample testing process begins, the external temperature controller can be started and the temperature of the sample can be set. And when the temperature of the sample measured by the thermometer reaches the set temperature and is stabilized for a period of time, the test can be started.

In addition, the sample can be placed in different temperatures by using the temperature controller, and the alternating-current magnetic susceptibility curves of the sample corresponding to different temperatures can be obtained by measuring the induced electromotive force of the secondary coil at different temperatures.

Preferably, the electrical lead 17 of the thermometer 18 is phosphor bronze wire, the electrical lead 17 of the heater 19 is pure copper wire, and the electrical lead 17 of the coil assembly may be gold flexible microwave coaxial cable.

Compared with the prior art, the low-temperature plug-in for testing the alternating-current magnetic susceptibility has the beneficial effects that the manufacturing process and the maintenance and replacement cost are simplified by independently winding the exciting coil and the secondary coil.

The beneficial effects of the invention also include:

1. two secondary coils wound in opposite directions are arranged, and samples are respectively placed at the same positions of the two secondary coils for testing respectively, so that system errors caused by the fact that induced electromotive force generated by the secondary coils in the manufacturing process is inconsistent with design expectation are eliminated.

2. The sample rod, the protective cover and the electrical lead are made of special materials, so that systematic errors in the sample measurement process are reduced in various aspects of preventing the sample from shaking, preventing environmental interference and the like.

3. The test temperature of the sample is controlled by the built-in thermometer, the heater and the external temperature controller, so that the sample is tested in a constant temperature environment.

The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.