CN112577995A - Gradient magnetic field magnetocaloric effect measuring device and control method - Google Patents
Gradient magnetic field magnetocaloric effect measuring device and control method Download PDFInfo
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Abstract
The invention discloses a gradient magnetic field magnetocaloric effect measuring device, comprising: the device comprises a magnet, a temperature sensor, a temperature regulator, a sample rod driving mechanism, a magnet driving mechanism and a controller. The invention also discloses a control method of the gradient magnetic field magnetocaloric effect measuring device. The invention can measure the magnetocaloric effect under different magnetic fields on the same measuring device and can also measure the magnetocaloric effect value changing among different magnetic field grades.
Description
Technical Field
The invention belongs to the solid state refrigeration technology, and particularly relates to a gradient magnetic field magnetocaloric effect measuring device and a control method.
Background
Room temperature magnetic refrigeration is a solid state refrigeration technology, and is a new refrigeration technology under development. With the development of new materials and new technologies, the development of room temperature magnetic refrigeration technology has been generally regarded by various countries and has made great progress in recent ten years. The technology meets the current requirement of the era of sustainable development and is considered as a green refrigeration technology which is hopeful to replace the traditional refrigeration technology.
The magnetic refrigeration technology is realized based on the magnetocaloric effect of the magnetocaloric material. When the magnetocaloric material is under the action of a changing magnetic field, a temperature change occurs, which is called the magnetocaloric effect of the material. Parameters for measuring the magnetocaloric property of the material are isothermal magnetic entropy change and adiabatic temperature change, and the common measurement method is divided into a direct measurement method and an indirect measurement method; the indirect measurement method is time-consuming and high in measurement cost, the direct measurement method is rapid and convenient, and the measurement cost is low; the direct measurement method is to make the magnetocaloric material under the action of changing magnetic field to directly measure the adiabatic temperature change value.
Chinese patent No. 200520008166.4 discloses a direct measurement device that can only measure the magnetocaloric effect of a material under a single magnetic field.
Disclosure of Invention
The invention aims to provide a gradient magnetic field magnetocaloric effect measuring device and a control method, which can measure magnetocaloric effects under different magnetic fields on the same measuring device and can also measure magnetocaloric effect values changing among different magnetic field grades.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
gradient magnetic field magnetocaloric effect measuring device, comprising: the device comprises a magnet, a temperature sensor, a temperature regulator, a sample rod driving mechanism, a magnet driving mechanism and a controller; the magnetic field of the magnet is a gradient magnetic field and comprises two gradient magnetic field pairs, and a space between the two gradient magnetic field pairs forms a variable magnetic field; the magnet driving mechanism receives the transverse displacement signal sent by the controller, drives the magnet to move horizontally and accurately positions the magnet to the position of the magnetic field required by the sample; the temperature sensor is used for detecting a temperature signal of the sample and sending the temperature signal to the controller; the front end of the sample rod is provided with a sample box, and the sample rod driving mechanism receives the longitudinal movement signal sent by the controller and drives the sample rod to longitudinally move according to the longitudinal movement signal; the temperature regulator receives the temperature control signal sent by the controller, and forms the environmental temperature of the sample according to the temperature control signal to meet the initial temperature required by sample measurement; the controller is used for controlling the temperature regulator, the sample rod driving mechanism and the magnet driving mechanism to complete the set magnetocaloric effect measurement.
Furthermore, the sample rod is driven by a sample rod driving mechanism to drive the sample to enter and exit the gradient magnetic field.
Furthermore, the gradient magnetic field pair forms a multi-pole gradient magnetic field, and the magnetic field intensity is arranged from large to small in sequence.
Further, a heat conducting pipe of the temperature regulator is coiled outside the sample box, and the ambient temperature of the sample is formed through the heat conducting pipe.
Furthermore, the gap space between the two gradient magnetic field pairs is used for entering and exiting the sample rod, so that the sample is magnetized and demagnetized, and the sample gap space is horizontally arranged.
The control method of the gradient magnetic field magnetocaloric effect measuring device comprises the steps that a gradient magnet comprises a pair of gradient magnetic field pairs, and the magnet driving mechanism drives the gradient magnetic field pairs to horizontally and transversely position and move so as to meet the requirements of a sample on different magnetic field strengths; the sample rod is driven by the sample rod driving mechanism to move longitudinally, and the sample rod drives the sample to enter and exit the magnetic field, so that the magnetization or demagnetization process of the sample is realized, and the magnetocaloric effect value of the sample is measured; adjusting the environmental temperature of the sample through a temperature regulator to meet the initial temperature required for measuring the magnetocaloric effect value of the sample; the temperature sensor detects a temperature signal of the sample and sends the temperature signal to the controller; the controller realizes the movement control of the sample by controlling the magnet driving mechanism and the sample rod driving mechanism, realizes the temperature collection by controlling the temperature controller and the temperature sensor, and completes the measurement of the magnetocaloric effect value of the sample.
Preferably, when measuring the magnetocaloric effect of the sample from a magnetic field to a zero magnetic field, the method comprises:
the controller sends a transverse displacement signal to the magnet driving mechanism, and the magnet driving mechanism controls the gradient magnetic field pair to move to a required magnetic field position and keep the gradient magnetic field pair still according to the transverse displacement signal;
the controller sends a longitudinal movement signal to the sample rod driving mechanism, the sample rod driving mechanism drives the sample rod to move longitudinally according to the longitudinal movement signal, and the sample rod moves the sample to the magnetic field center position of the magnet;
the temperature control signal sent by the controller is sent to the temperature regulator, the temperature regulator controls the environmental temperature of the sample to reach the set temperature according to the temperature control signal, and the temperature sensor sends the detected set temperature signal to the controller;
the controller sends a longitudinal moving-out signal to the sample rod driving mechanism, the sample rod driving mechanism drives the sample rod to move longitudinally according to the longitudinal moving-out signal, the sample rod generates a magnetic field, the temperature sensor collects a temperature change value, and a magnetocaloric effect value of the sample at a set temperature is obtained.
Preferably, when measuring the magnetocaloric effect of the sample changing from a high magnetic field to a low magnetic field, the method comprises:
the controller sends a longitudinal movement signal to the sample rod driving mechanism, and the sample rod driving mechanism drives the sample rod to move longitudinally, so that the sample is moved to the center position of the magnetic field and is kept still;
the controller sends a transverse displacement signal to the magnet driving mechanism, and the magnet driving mechanism controls the gradient magnetic field pair to transversely move to a required magnetic field position;
the controller sends out a temperature control signal to the temperature regulator, the temperature regulator controls the environmental temperature of the sample to reach the required set temperature, and the temperature sensor sends the detected set temperature signal to the controller;
the controller sends a transverse displacement signal to the magnet driving mechanism, the magnet driving mechanism controls the gradient magnetic field to move, and the magnetic field of the sample is changed from a high magnetic field to a low magnetic field; and the temperature sensor acquires a temperature change value to obtain a magnetocaloric effect value of the sample at a set temperature.
Preferably, when measuring the magnetocaloric effect of the sample from zero field to the presence of a magnetic field, the method comprises:
the controller sends a transverse displacement signal to the magnet driving mechanism, and the magnet driving mechanism controls the gradient magnetic field pair to move to a required magnetic field position and keep the gradient magnetic field pair still according to the transverse displacement signal;
the controller sends a longitudinal moving-out signal to the sample rod driving mechanism, and the sample rod driving mechanism moves the sample to the zero magnetic field position of the temperature regulator;
the controller sends a temperature control signal to the temperature regulator, the temperature regulator controls the environmental temperature of the sample to reach the required set temperature, and the temperature sensor sends the detected set temperature signal to the controller;
the controller sends a longitudinal moving-out signal to the sample rod driving mechanism, the sample rod driving mechanism moves the sample into the magnetic field, and the temperature sensor collects the temperature change value to obtain the magnetocaloric effect value of the sample at the set temperature.
Preferably, when measuring the magnetocaloric effect of the sample changing from a low magnetic field to a high magnetic field, the method comprises:
the controller sends a longitudinal moving-out signal to the sample rod driving mechanism, and the sample rod driving mechanism moves the sample 2 to a zero magnetic field position and keeps the sample 2 still;
the controller sends a transverse displacement signal to the magnet driving mechanism, and the magnet driving mechanism controls the gradient magnetic field pair to move to a required magnetic field position according to the transverse displacement signal;
the controller sends out a temperature control signal to the temperature regulator, the temperature regulator controls the environmental temperature of the sample to reach the required set temperature, and the temperature sensor sends the detected set temperature signal to the controller;
the controller sends a transverse displacement signal to the magnet driving mechanism, the magnet driving mechanism controls the gradient magnetic field pair to move according to the transverse displacement signal, and the sample changes from a low magnetic field position to a high magnetic field position; and the temperature sensor acquires a temperature change value to obtain a magnetocaloric effect value of the sample at the set temperature.
The invention has the technical effects that:
the invention relates to a direct measurement device for magnetocaloric effect, which comprises a magnetic field system consisting of multi-pole gradient magnets and can realize the magnetocaloric effect of a sample under different magnetic fields (the magnetic field is changed into zero) on one device; the magnetocaloric effect of the sample under different magnetic field level changes can also be realized.
The gradient magnet is formed by a pair of gradient magnetic field pairs to form a plurality of magnetic field area spaces, and can be horizontally and transversely accurately positioned and moved under the drive of the magnet driving mechanism to meet the requirements of a sample on different magnetic field strengths; the temperature regulator can regulate the environmental temperature of the sample to meet the initial temperature required by sample measurement; the sample and the temperature sensor stuck on the sample are fixed in the sample rod component and driven by the sample rod driving mechanism, and can move in and out of a magnetic field longitudinally, so that the sample magnetization and demagnetization processes are realized to measure the magnetocaloric effect value of the sample; the temperature control, the movement control and the temperature acquisition are all controlled by the controller according to a programmed program to complete the measurement of the magnetocaloric effect curve.
Drawings
FIG. 1 is a schematic structural diagram of a gradient magnetic field magnetocaloric effect measuring apparatus according to the present invention;
fig. 2 is a schematic structural view of a magnet in the present invention.
Detailed Description
The following description sufficiently illustrates specific embodiments of the invention to enable those skilled in the art to practice and reproduce it.
FIG. 1 is a schematic diagram of a gradient magnetic field magnetocaloric effect measuring apparatus according to the present invention; fig. 2 is a schematic view of the structure of the magnet 1 according to the present invention.
Gradient magnetic field magnetocaloric effect measuring device, comprising: the device comprises a magnet 1, a temperature sensor 3, a temperature regulator 4, a sample rod 5, a sample rod driving mechanism 6, a magnet driving mechanism 7 and a controller 8.
The magnetic field formed by the magnet 1 is a gradient magnetic field, the magnet 1 is composed of an upper gradient magnetic field pair 11 and a lower gradient magnetic field pair 11, the gradient magnetic field pairs 11 can generate a plurality of magnetic fields with different strengths to form a multi-pole gradient magnetic field, the magnetic field strengths are sequentially arranged from large to small, the gradient magnetic field pairs 11 can horizontally move transversely, and the precise positioning control is realized by a servo motor. The space between the two gradient magnetic field pairs 11 forms a varying magnetic field, and the gap space between the two gradient magnetic field pairs 11 is the moving interval of the sample 2. In the preferred embodiment, the magnet 1 is horizontally arranged, the sample gap space is horizontally arranged, and the horizontal movement of the gradient magnetic field pair 11 can meet the requirements of different magnetic field strengths of the sample 2.
In the preferred embodiment of the present invention, the magnet 1 is a three-level gradient magnetic field, and the upper and lower gradient magnetic field pairs 11 form three magnetic field regions, wherein the arrows indicate the magnetic line density. The gap space between the gradient magnetic field pairs 11 can pass in and out of the sample rod to magnetize and demagnetize the sample 2. The gradient magnetic field pair 11 is driven by the magnet driving mechanism 7 to move transversely left and right and is accurately positioned, so that the magnetic field required by the sample 2 is met.
The magnet driving mechanism 7 receives the transverse displacement signal sent by the controller 8, drives the magnet 1 to horizontally move left and right, and accurately positions the magnet to the position of the magnetic field required by the sample 2.
The temperature sensor 3 is attached to the sample 2. The temperature sensor 3 is used for detecting a temperature signal of the sample 2 and sending the temperature signal to the controller 8.
The front end of the sample rod 5 is provided with a sample box, and the sample 2 is fixed in the sample box. The sample rod 5 is driven by the sample rod driving mechanism 6 to move up and down longitudinally, and drives the sample 2 to enter and exit the magnetic field. The sample rod driving mechanism 6 receives the longitudinal movement signal sent by the controller 8, and drives the longitudinal movement of the sample rod 5 according to the longitudinal movement signal.
The temperature regulator 4 receives the temperature control signal sent by the controller 8, forms the environmental temperature of the sample 2 according to the temperature control signal, and meets the initial temperature (different set temperatures can be set) required by the sample measurement. The heat conducting pipe of the temperature regulator 4 is coiled outside the sample box, the temperature regulator 4 can be used for refrigerating or heating, and the temperature is transferred to the periphery of the sample 2 through the heat conducting pipe to form the environmental temperature of the sample 2.
The controller 8 is used for controlling the temperature regulator 4, the sample rod driving mechanism 6 and the magnet driving mechanism 7 to complete the set whole measuring program.
The invention is a direct measuring device of magnetocaloric effect, which is a magnetic field system composed of multi-pole gradient magnets (gradient magnetic field pairs 11), and can realize the magnetocaloric effect of a sample 2 under different magnetic fields (changing from magnetic field to zero magnetic field) on one device; the magnetocaloric effect of the sample 2 under different magnetic field level changes can also be achieved. When the magnetic field is measured from a high field to a zero field (or from a zero field to a high field), the required magnetic field is selected, the positioning is accurately controlled, namely, the gradient magnetic field pair 11 is moved to a fixed position, and only the sample 2 is moved longitudinally in and out of the magnetic field to realize the measurement. When the magnetic field change measurement between different magnetic field grades is carried out, the sample 2 is moved into the magnetic field and is not moved, and the measurement is realized by the horizontal transverse movement of the gradient magnetic field pair 11.
The control method of the gradient magnetic field magnetocaloric effect measuring device comprises the steps that a gradient magnet comprises a pair of gradient magnetic field pairs, and the magnet driving mechanism 7 drives the horizontal transverse positioning movement of the gradient magnetic field pairs 11 to meet the requirements of a sample 2 on different magnetic field strengths; the sample rod driving mechanism 6 drives the sample rod 5 to move longitudinally, and the sample rod 5 drives the sample 2 to enter and exit the magnetic field, so that the magnetization or demagnetization process of the sample 2 is realized, and the magnetocaloric effect value of the sample 2 is measured; adjusting the ambient temperature of the sample 2 by the temperature adjuster 4 to satisfy the starting temperature required for measuring the magnetocaloric effect value of the sample 2; the temperature sensor 3 detects a temperature signal of the sample 2 and sends the temperature signal to the controller 8; the controller 8 controls the movement of the sample 2 by controlling the magnet driving mechanism 7 and the sample rod driving mechanism 6, controls the temperature by controlling the temperature regulator 4, collects the temperature by the temperature sensor 3, measures the magnetocaloric effect value of the sample 2, and draws a magnetocaloric effect curve for measurement.
When measuring the magnetocaloric effect of the sample 2 changing from the presence of a magnetic field to the zero magnetic field, the control method of the gradient magnetic field magnetocaloric effect measuring device comprises the following steps:
step 11: the controller 8 sends a transverse displacement signal to the magnet driving mechanism 7, and the magnet driving mechanism 7 controls the gradient magnetic field pair 11 to move to a required magnetic field position and keep the gradient magnetic field position still according to the transverse displacement signal;
step 12: the controller 8 sends a longitudinal movement signal to the sample rod driving mechanism 6, the sample rod driving mechanism 6 drives the sample rod 5 to move longitudinally according to the longitudinal movement signal, and the sample rod 5 moves the sample 2 to the magnetic field center position of the magnet 1;
step 13: the temperature control signal sent by the controller 8 is sent to the temperature regulator 4, the temperature regulator 4 controls the environmental temperature of the sample 2 to reach the set temperature according to the temperature control signal, and the temperature sensor 3 sends the detected set temperature signal to the controller 8;
step 14: the controller 8 sends a longitudinal moving-out signal to the sample rod driving mechanism 6, the sample rod driving mechanism 6 drives the sample rod 5 to move longitudinally according to the longitudinal moving-out signal, the sample rod 4 generates a magnetic field, and the temperature sensor 3 collects a temperature change value to obtain a magnetocaloric effect value of the sample 2 at a set temperature.
And when the magnetocaloric effect at other temperatures needs to be measured, repeating the steps 12 to 14. And when other magnetic fields are required to be changed for measuring the magnetocaloric effect, repeating the steps 11 to 14. The step (2).
When measuring the magnetocaloric effect of the sample 2 under different magnetic field level changes (for example, a change from a high magnetic field to a low magnetic field), the control method of the gradient magnetic field magnetocaloric effect measuring apparatus comprises the following steps:
step 21: the controller 8 sends a longitudinal movement signal to the sample rod driving mechanism 6, and the sample rod driving mechanism 6 drives the sample rod 5 to move longitudinally, so that the sample 2 is moved to the center position of the magnetic field and is kept still;
step 22: the controller 8 sends a transverse displacement signal to the magnet driving mechanism 7, and the magnet driving mechanism 7 controls the gradient magnetic field pair 11 to transversely move to a required magnetic field position;
step 23: the controller 8 sends a temperature control signal to the temperature regulator 4, the temperature regulator 4 controls the ambient temperature of the sample 2 to reach the required set temperature, and the temperature sensor 3 sends the detected set temperature signal to the controller 8;
step 24: the controller 8 sends a transverse displacement signal to the magnet driving mechanism 7, the magnet driving mechanism 7 controls the gradient magnetic field pair 11 to move left, and the magnetic field of the sample 2 is changed from a high magnetic field to a low magnetic field; the temperature sensor 3 collects the temperature change value to obtain the magnetocaloric effect value of the sample at the set temperature.
Step 25: the controller 8 sends a transverse displacement signal to the magnet driving mechanism 7, the magnet driving mechanism 7 controls the gradient magnetic field pair 11 to move right, and the magnetic field of the sample 2 returns to the high magnetic field from the low magnetic field.
When the magnetocaloric effect at other temperatures needs to be measured, repeating steps 22 to 25; repeating the steps 21 to 26 when the magnetocaloric effect needs to be measured in exchange for another magnetic field.
The above is the magnetic field decreasing measurement, and the magnetic field increasing measurement can be performed in the same way. When the measurement sample changes from zero magnetic field to magnetocaloric effect under the magnetic field, the control method of the gradient magnetic field magnetocaloric effect measuring device comprises the following steps:
step 31: the controller 8 sends a transverse displacement signal to the magnet driving mechanism 7, and the magnet driving mechanism 7 controls the gradient magnetic field pair 11 to move to a required magnetic field position and keep the gradient magnetic field position still according to the transverse displacement signal;
step 32: the controller 8 sends a longitudinal moving-out signal to the sample rod driving mechanism 6, and the sample rod driving mechanism 6 moves the sample 2 to the central position (zero magnetic field) of the temperature regulator 4;
step 33: the controller 8 sends a temperature control signal to the temperature regulator 4, the temperature regulator 4 controls the ambient temperature of the sample 2 to reach the required set temperature, and the temperature sensor 3 sends the detected set temperature signal to the controller 8;
step 34: the controller 8 sends a longitudinal moving-out signal to the sample rod driving mechanism 6, the sample rod driving mechanism 6 moves the sample 2 into the magnetic field, and the temperature sensor 3 collects the temperature change value to obtain the magnetocaloric effect value of the sample 2 at the set temperature.
Repeating steps 32 to 34 when it is desired to measure magnetocaloric effects at other temperatures; repeating the steps 31 to 34 when the magnetocaloric effect needs to be measured in exchange for other magnetic fields.
When measuring the magnetocaloric effect of the sample 2 under different magnetic field level changes (taking the example of changing from a low magnetic field to a high magnetic field), the control method of the gradient magnetic field magnetocaloric effect measuring device comprises the following steps:
step 41: the controller 8 sends a longitudinal moving-out signal to the sample rod driving mechanism 6, and the sample rod driving mechanism 6 moves the sample 2 to the central position of the magnetic field and keeps the sample fixed;
step 42: the controller 8 sends a transverse displacement signal to the magnet driving mechanism 7, and the magnet driving mechanism 7 controls the gradient magnetic field pair 11 to move to a required magnetic field position according to the transverse displacement signal;
step 43: the controller 8 sends a temperature control signal to the temperature regulator 4, the temperature regulator 4 controls the ambient temperature of the sample 2 to reach the required set temperature, and the temperature sensor 3 sends the detected set temperature signal to the controller 8;
step 44: the controller 8 sends a transverse displacement signal to the magnet driving mechanism 7, the magnet driving mechanism 7 controls the gradient magnetic field pair 11 to move right according to the transverse displacement signal, and the sample 2 changes from a low magnetic field position to a high magnetic field position; the temperature sensor 3 collects the temperature variation value to obtain the magnetocaloric effect value of the sample 2 at the set temperature.
Step 45: the controller 8 sends a transverse displacement signal to the magnet driving mechanism 7 to control the magnet 1 to move left, and the sample 2 returns to a low magnetic field from a high magnetic field.
When the magnetocaloric effect at other temperatures needs to be measured, repeating steps 42 to 45; the steps of steps 41 to 45 above are repeated when it is necessary to measure the magnetocaloric effect in exchange for another magnetic field.
The terminology used herein is for the purpose of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (10)
1. A gradient magnetic field magnetocaloric effect measuring apparatus, comprising: the device comprises a magnet, a temperature sensor, a temperature regulator, a sample rod driving mechanism, a magnet driving mechanism and a controller; the magnetic field of the magnet is a gradient magnetic field and comprises two gradient magnetic field pairs, and a space between the two gradient magnetic field pairs forms a variable magnetic field; the magnet driving mechanism receives the transverse displacement signal sent by the controller, drives the magnet to move horizontally and accurately positions the magnet to the position of the magnetic field required by the sample; the temperature sensor is used for detecting a temperature signal of the sample and sending the temperature signal to the controller; the front end of the sample rod is provided with a sample box, and the sample rod driving mechanism receives the longitudinal movement signal sent by the controller and drives the sample rod to longitudinally move according to the longitudinal movement signal; the temperature regulator receives the temperature control signal sent by the controller, and forms the environmental temperature of the sample according to the temperature control signal to meet the initial temperature required by sample measurement; the controller is used for controlling the temperature regulator, the sample rod driving mechanism and the magnet driving mechanism to complete the set magnetocaloric effect measurement.
2. The gradient magnetic field magnetocaloric effect measurement device according to claim 1, wherein the sample rod is driven by a sample rod driving mechanism to move the sample into and out of the gradient magnetic field.
3. The gradient magnetic field magnetocaloric effect measuring device according to claim 1, wherein the gradient magnetic field pairs form a multi-pole gradient magnetic field, the magnetic field strength being arranged from large to small in sequence.
4. The gradient magnetic field magnetocaloric effect measuring device according to claim 1, wherein the heat conducting pipe of the temperature regulator is wound outside the sample case, and the ambient temperature of the sample is formed by the heat conducting pipe.
5. The gradient magnetic field magnetocaloric effect measuring device according to claim 1, wherein the gap space between the two gradient magnetic field pairs is used for entering and exiting the sample rod to magnetize and demagnetize the sample, and the sample gap space is horizontally disposed.
6. A control method of a gradient magnetic field magnetocaloric effect measuring device is characterized in that a gradient magnet comprises a pair of gradient magnetic field pairs, and the magnet driving mechanism drives the gradient magnetic field pairs to horizontally and transversely position and move so as to meet the requirements of a sample on different magnetic field strengths; the sample rod is driven by the sample rod driving mechanism to move longitudinally, and the sample rod drives the sample to enter and exit the magnetic field, so that the magnetization or demagnetization process of the sample is realized, and the magnetocaloric effect value of the sample is measured; adjusting the environmental temperature of the sample through a temperature regulator to meet the initial temperature required for measuring the magnetocaloric effect value of the sample; the temperature sensor detects a temperature signal of the sample and sends the temperature signal to the controller; the controller realizes the movement control of the sample by controlling the magnet driving mechanism and the sample rod driving mechanism, realizes the temperature collection by controlling the temperature controller and the temperature sensor, and completes the measurement of the magnetocaloric effect value of the sample.
7. The method for controlling a gradient magnetic field magnetocaloric effect measuring apparatus according to claim 6, wherein when measuring the magnetocaloric effect of the sample from the presence of the magnetic field to the zero magnetic field, the method comprises:
the controller sends a transverse displacement signal to the magnet driving mechanism, and the magnet driving mechanism controls the gradient magnetic field pair to move to a required magnetic field position and keep the gradient magnetic field pair still according to the transverse displacement signal;
the controller sends a longitudinal movement signal to the sample rod driving mechanism, the sample rod driving mechanism drives the sample rod to move longitudinally according to the longitudinal movement signal, and the sample rod moves the sample to the magnetic field center position of the magnet;
the temperature control signal sent by the controller is sent to the temperature regulator, the temperature regulator controls the environmental temperature of the sample to reach the set temperature according to the temperature control signal, and the temperature sensor sends the detected set temperature signal to the controller;
the controller sends a longitudinal moving-out signal to the sample rod driving mechanism, the sample rod driving mechanism drives the sample rod to move longitudinally according to the longitudinal moving-out signal, the sample rod generates a magnetic field, the temperature sensor collects a temperature change value, and a magnetocaloric effect value of the sample at a set temperature is obtained.
8. The method for controlling a gradient magnetic field magnetocaloric effect measuring apparatus according to claim 6, wherein when measuring the magnetocaloric effect of the sample changing from a high magnetic field to a low magnetic field, the method comprises:
the controller sends a longitudinal movement signal to the sample rod driving mechanism, and the sample rod driving mechanism drives the sample rod to move longitudinally, so that the sample is moved to the center position of the magnetic field and is kept still;
the controller sends a transverse displacement signal to the magnet driving mechanism, and the magnet driving mechanism controls the gradient magnetic field pair to transversely move to a required magnetic field position;
the controller sends out a temperature control signal to the temperature regulator, the temperature regulator controls the environmental temperature of the sample to reach the required set temperature, and the temperature sensor sends the detected set temperature signal to the controller;
the controller sends a transverse displacement signal to the magnet driving mechanism, the magnet driving mechanism controls the gradient magnetic field to move, and the magnetic field of the sample is changed from a high magnetic field to a low magnetic field; and the temperature sensor acquires a temperature change value to obtain a magnetocaloric effect value of the sample at a set temperature.
9. The method for controlling a gradient magnetic field magnetocaloric effect measuring apparatus according to claim 6, wherein when measuring the magnetocaloric effect of the sample from zero magnetic field to magnetic field, the method comprises:
the controller sends a transverse displacement signal to the magnet driving mechanism, and the magnet driving mechanism controls the gradient magnetic field pair to move to a required magnetic field position and keep the gradient magnetic field pair still according to the transverse displacement signal;
the controller sends a longitudinal moving-out signal to the sample rod driving mechanism, and the sample rod driving mechanism moves the sample to the zero magnetic field position of the temperature regulator;
the controller sends a temperature control signal to the temperature regulator, the temperature regulator controls the environmental temperature of the sample to reach the required set temperature, and the temperature sensor sends the detected set temperature signal to the controller;
the controller sends a longitudinal moving-out signal to the sample rod driving mechanism, the sample rod driving mechanism moves the sample into the magnetic field, and the temperature sensor collects the temperature change value to obtain the magnetocaloric effect value of the sample at the set temperature.
10. The method for controlling a gradient magnetic field magnetocaloric effect measuring apparatus according to claim 6, wherein when measuring the magnetocaloric effect of the sample changing from a low magnetic field to a high magnetic field, the method comprises:
the controller sends a longitudinal moving-out signal to the sample rod driving mechanism, and the sample rod driving mechanism moves the sample 2 to a zero magnetic field position and keeps the sample 2 still;
the controller sends a transverse displacement signal to the magnet driving mechanism, and the magnet driving mechanism controls the gradient magnetic field pair to move to a required magnetic field position according to the transverse displacement signal;
the controller sends out a temperature control signal to the temperature regulator, the temperature regulator controls the environmental temperature of the sample to reach the required set temperature, and the temperature sensor sends the detected set temperature signal to the controller;
the controller sends a transverse displacement signal to the magnet driving mechanism, the magnet driving mechanism controls the gradient magnetic field pair to move according to the transverse displacement signal, and the sample changes from a low magnetic field position to a high magnetic field position; and the temperature sensor acquires a temperature change value to obtain a magnetocaloric effect value of the sample at the set temperature.
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