A magnetoacoustic imaging electrode contact device

Abstract

The present invention discloses a magnetoacoustic imaging electrode contact device. The magnetoacoustic imaging electrode contact device comprises: a bottom plate, a first columnar electrode and a second columnar electrode. The upper surface of the bottom plate is provided with a first electrode groove and a second electrode groove, a first through hole is provided at the bottom of the first electrode groove, and the first columnar electrode is provided in the first through hole; a second through hole is provided at the bottom of the second electrode groove, and the second columnar electrode is provided in the second through hole; the first electrode groove and the second electrode groove are both used to inject liquid metal, and the liquid metal in the first electrode groove forms a first contact electrode after solidification; the liquid metal in the second electrode groove forms a second contact electrode after solidification; when a sample for magnetoacoustic imaging is placed on the bottom plate, it contacts both the first contact electrode and the second contact electrode. The embodiments of the present invention can make the contact between the electrode and the sample better, and improve the detection accuracy of magnetoacoustic imaging.

Description

Technical Field

[0001] The invention relates to the technical field of medical functional imaging instruments, and in particular to a magnetoacoustic imaging electrode contact device. Background Art

[0002] In the medical field, electrical property detection imaging methods based on current injection, such as injection current magnetoacoustic imaging methods, have important research value in the diagnosis and monitoring of tissue diseases. In existing magnetoacoustic imaging experiments, rod electrodes or filament electrodes are usually used to apply excitation to the experimental samples, but the existing electrodes have a small contact area with the samples, which is prone to poor contact, resulting in uneven injection current, which leads to errors in signal measurement and affects the monitoring of sample electrical parameters. Therefore, there is a problem of poor contact between the existing electrodes and the samples, which affects the detection accuracy. Summary of the invention

[0003] The invention provides a magnetoacoustic imaging electrode contact device, so as to make the contact between the electrode and the sample better and improve the detection accuracy of magnetoacoustic imaging.

[0004] An embodiment of the present invention provides a magnetoacoustic imaging electrode contact device, comprising: a bottom plate, a first columnar electrode and a second columnar electrode;

[0005] The upper surface of the bottom plate is provided with a first electrode groove and a second electrode groove, the bottom of the first electrode groove is provided with a first through hole, and the first columnar electrode is provided in the first through hole; the bottom of the second electrode groove is provided with a second through hole, and the second columnar electrode is provided in the second through hole;

[0006] The first electrode groove and the second electrode groove are both used to inject liquid metal. The liquid metal in the first electrode groove forms a first contact electrode after solidification; the liquid metal in the second electrode groove forms a second contact electrode after solidification; when a sample for magnetoacoustic imaging is placed on the base plate, it contacts both the first contact electrode and the second contact electrode.

[0007] Optionally, the upper surface of the bottom plate is further provided with a loading groove, and a third through hole is opened at the bottom of the loading groove;

[0008] The magnetoacoustic imaging electrode contact device further comprises: a stage and a pad;

[0009] The stage comprises a fixedly connected sample tray and a support column; the support column is used to pass through the third through hole so that the sample tray is placed in the sample groove, a side of the sample tray close to the support column is in contact with the bottom surface of the sample groove, and a side of the sample tray away from the support column is flush with the upper surface of the bottom plate; the stage is used to carry the sample;

[0010] The cushion block is fixedly disposed on the lower surface of the bottom plate, and is used to support the bottom plate; the thickness of the cushion block is greater than the length of the support column extending out of the third through hole.

[0011] Optionally, the loading plate and the supporting column are both cylindrical, and an extension line of a central axis of the loading plate coincides with a central axis of the supporting column.

[0012] Optionally, the magnetoacoustic imaging electrode contact device further comprises: a rotating mechanism; the rotating mechanism is connected to the supporting column, and the rotating mechanism is used to control the stage to rotate with the central axis of the supporting column as the rotating axis.

[0013] Optionally, the first electrode groove, the object-carrying groove and the second electrode groove are distributed in sequence along the length direction of the bottom plate.

[0014] Optionally, the magnetoacoustic imaging electrode contact device further comprises:

[0015] an impedance meter; a first end of the impedance meter is electrically connected to the first columnar electrode, and a second end of the impedance meter is electrically connected to the second columnar electrode;

[0016] an excitation source; a first end of the excitation source is electrically connected to the first columnar electrode, and a second end of the excitation source is electrically connected to the second columnar electrode.

[0017] Optionally, the magnetoacoustic imaging electrode contact device further comprises: a first selection switch and a second selection switch;

[0018] The first end of the first selection switch is electrically connected to the first columnar electrode, the second end of the first selection switch is electrically connected to the first end of the impedance meter, and the third end of the first selection switch is electrically connected to the first end of the excitation source;

[0019] A first end of the second selection switch is electrically connected to the second columnar electrode, a second end of the second selection switch is electrically connected to a second end of the impedance meter, and a third end of the second selection switch is electrically connected to a second end of the excitation source.

[0020] Optionally, a fourth through hole is further provided at the bottom of the first electrode groove, and a fifth through hole is further provided at the bottom of the second electrode groove;

[0021] The magnetoacoustic imaging electrode contact device also includes:

[0022] A first heat conducting rod is disposed in the fourth through hole;

[0023] A second heat conducting rod is disposed in the fifth through hole;

[0024] a temperature controller; a first end of the temperature controller is connected to the first heat-conducting rod, and a second end of the temperature controller is connected to the second heat-conducting rod;

[0025] A temperature sensor; a first end of the temperature sensor is connected to the first heat-conducting rod, and a second end of the temperature sensor is connected to the second heat-conducting rod.

[0026] Optionally, the magnetoacoustic imaging electrode contact device further comprises:

[0027] A first liquid injection port; the first liquid injection port extends from the side of the bottom plate to the inner surface of the first electrode groove;

[0028] The second liquid injection port extends from the side of the bottom plate to the inner surface of the second electrode groove.

[0029] Optionally, the magnetoacoustic imaging electrode contact device further comprises:

[0030] A first liquid outlet; the first liquid outlet extends from the side of the bottom plate to the inner surface of the first electrode groove;

[0031] A second liquid outlet; the second liquid outlet extends from the side of the bottom plate to the inner surface of the second electrode groove;

[0032] A sealing plug; the sealing plug is used to be inserted into the liquid outlet corresponding to the electrode groove when the liquid metal is injected into the first electrode groove and / or the second electrode groove; and to be pulled out from the liquid outlet corresponding to the electrode groove when the liquid metal needs to be discharged from the first electrode groove and / or the second electrode groove.

[0033] The embodiment of the present invention provides a new type of electrode contact device for magnetoacoustic imaging, in which a bottom plate, a first columnar electrode and a second columnar electrode are provided; two electrode grooves and two through holes are provided on the bottom plate, the two through holes are respectively connected to the two electrode grooves, and the two columnar electrodes are respectively placed in the two through holes. By injecting liquid metal into the two electrode grooves, a contact electrode with a bottom area significantly larger than the bottom area of ​​the columnar electrode can be formed. Therefore, compared with the electrode clamping method in the prior art, the embodiment of the present invention adopts the contact electrode to achieve electrical contact with the sample, which can effectively increase the contact area between the electrode and the sample, ensure good contact between the electrode and the sample, facilitate the injection of the excitation electrical signal into the sample, and avoid errors caused by poor electrical contact. Moreover, regardless of whether the contact surface between the sample and the contact electrode is flat, the contact electrode with a larger area can ensure that there is at least one contact point with the sample, thereby ensuring good electrical contact. Therefore, compared with the prior art, the embodiment of the present invention can make the contact between the electrode and the sample better and improve the detection accuracy of magnetoacoustic imaging.

[0034] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 It is a structural schematic diagram of a magnetoacoustic imaging electrode contact device provided by an embodiment of the present invention;

[0037] Figure 2 is a structural schematic diagram of another magnetoacoustic imaging electrode contact device provided by an embodiment of the present invention;

[0038] Figure 3 It is a structural schematic diagram of another magnetoacoustic imaging electrode contact device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0040] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0041] An embodiment of the present invention provides a magnetoacoustic imaging electrode contact device. Figure 1Schematic diagram of a magnetoacoustic imaging electrode contact device provided by an embodiment of the present invention. Figure 1 The magnetoacoustic imaging electrode contact device includes: a base plate 10, a first columnar electrode 21 and a second columnar electrode 22. Figure 1 In the figure, a three-dimensional rectangular coordinate system (the first direction X, the second direction Y and the third direction Z are mutually perpendicular) is given as a reference system in order to describe the relative position relationship of each component in the device. Taking the bottom plate 10 as an example, the first direction X is the length direction (or width direction) of the bottom plate 10; the second direction Y is the width direction (or length direction) of the bottom plate 10; the third direction Z is the thickness direction of the bottom plate 10, which can also be said to be the direction from the bottom surface of the bottom plate 10 to the upper surface of the bottom plate 10.

[0042] In the magnetoacoustic imaging electrode contact device, the upper surface of the bottom plate 10 is provided with a first electrode groove 11 and a second electrode groove 12. The first electrode groove 12 has a first through hole 111 at the bottom, and the first columnar electrode 21 is arranged in the first through hole 111; the second electrode groove 12 has a second through hole 121 at the bottom, and the second columnar electrode 22 is arranged in the second through hole 121. The first electrode groove 11 and the second electrode groove 21 are both used to inject liquid metal. The state of the liquid metal after being injected into the electrode groove can be seen in FIG. Figure 2 The state of the sample placed on the bottom plate 10 can be seen in Figure 3 See also Figure 2 and Figure 3 , the liquid metal 101 in the first electrode groove 11 solidifies to form the first contact electrode 100; the liquid metal 101 in the second electrode groove 12 solidifies to form the second contact electrode 200; the upper surfaces of the first contact electrode 100 and the second contact electrode 200 are both flush with the upper surface of the bottom plate 10. When the sample 300 for magnetoacoustic imaging is placed on the bottom plate 10, it contacts both the first contact electrode 100 and the second contact electrode 200. That is, the positions of the first electrode groove 11 and the second electrode groove 12 on the bottom plate 10 must satisfy: the vertical projection of the sample 300 on the bottom plate 10 at least partially covers the vertical projection of the first contact electrode 100 and the second contact electrode 200 on the bottom plate 10. Since the bottom area of ​​the electrode groove is significantly larger than the bottom area of ​​the columnar electrode, then, compared with directly clamping the columnar electrode on the sample 300, the contact electrode significantly increases the contact area between the electrode and the sample 300, which can make the injection current more uniform during the magnetoacoustic imaging experiment and improve the signal quality.

[0043] Exemplarily, in the third direction Z, the sum of the thickness of the first electrode groove 11 and the thickness of the first through hole 111 is equal to the thickness of the bottom plate 10, and the sum of the thickness of the second electrode groove 21 and the thickness of the second through hole 121 is equal to the thickness of the bottom plate 10. The first electrode groove 11 and the second electrode groove 21 can both be square grooves or circular grooves, and the shapes and sizes of the two can be exactly the same. The first through hole 111 and the second through hole 121 can be respectively arranged at corresponding positions in the two electrode grooves to ensure the consistency of the two contact electrodes after the production is completed. Alternatively, the shape and size of the first electrode groove 11 and the second electrode groove 21, the shape and size of the first through hole 111 and the second through hole 121, and the position distribution of the through holes in the electrode grooves can be different or partially different, and can be specifically set according to actual needs, which is not limited here. Exemplarily, the thickness of the bottom plate 10 (the thickness in the third direction Z) can be 10 mm. The two electrode grooves can be square grooves of 60mm*10mm*5mm, the two through holes can be cylindrical holes with a diameter equal to or slightly larger than 5mm, and the two columnar electrodes can be copper rods with a diameter of 5mm. The liquid metal 101 is, for example, gallium-based liquid metal.

[0044] Exemplarily, after the columnar electrode is placed in the through hole, a sealant or other material can be used to fill the gap between the through hole and the side wall of the columnar electrode to ensure that when the liquid metal is injected into the electrode groove, the liquid metal will not leak through the through hole. The upper surface of the columnar electrode can be higher than the bottom surface of the electrode groove, lower than the bottom surface of the electrode groove, or flush with the bottom surface of the electrode groove; when the upper surface of the columnar electrode is not higher than the bottom surface of the electrode groove, it is necessary to ensure that the upper surface of the columnar electrode is not covered by insulating material; or, a conductive adhesive can be directly used to seal the gap between the through hole and the columnar electrode to ensure that the liquid metal 101 is in electrical contact with the columnar electrode, and to ensure that the liquid metal 101 can form a reliable electrical connection with the columnar electrode after solidifying into a contact electrode. The external power application or electrical signal acquisition device can be connected to the bottom surface of the columnar electrode through a cable. Exemplarily, the bottom plate 10 can be made of a hard insulating material, such as an acrylic plate.

[0045] The embodiment of the present invention provides a new type of electrode contact device for magnetoacoustic imaging, in which a bottom plate 10, a first columnar electrode 21 and a second columnar electrode 22 are provided; two electrode grooves and two through holes are provided on the bottom plate 10, the two through holes are respectively connected to the two electrode grooves, and the two columnar electrodes are respectively placed in the two through holes. By injecting liquid metal 101 into the two electrode grooves, a contact electrode with a bottom area significantly larger than the bottom area of ​​the columnar electrode can be formed. Therefore, compared with the electrode clamping method in the prior art, the embodiment of the present invention adopts the contact electrode to achieve electrical contact with the sample 300, which can effectively increase the contact area between the electrode and the sample 300, ensure good contact between the electrode and the sample 300, facilitate the injection of the excitation electrical signal into the sample 300, and avoid errors caused by poor electrical contact. Moreover, regardless of whether the contact surface between the sample 300 and the contact electrode is flat, the contact electrode with a larger area can ensure that there is at least one contact point with the sample 300, thereby ensuring good electrical contact. Therefore, compared with the prior art, the embodiment of the present invention can make the contact between the electrode and the sample 300 better and improve the detection accuracy of magnetoacoustic imaging.

[0046] Continue to see Figure 1-3 On the basis of the above embodiments, optionally, the upper surface of the bottom plate 10 is further provided with a loading groove 13, and a third through hole 131 is opened at the bottom of the loading groove 13. The magnetoacoustic imaging electrode contact device also includes: a loading platform 40 and a cushion block 50. The loading platform 40 is used to carry the sample 300. Before the experiment begins, the loading platform 40 can be placed along the Figure 1 Insert the sample 300 into the loading groove 13 and the third through hole 131 in the direction of the downward hollow arrow in the loading table 40. The loading table 40 includes a loading tray 41 and a support column 42 which are fixedly connected; the support column 42 is used to pass through the third through hole 131 so that the loading tray 41 is placed in the loading groove 13. When the loading tray 41 is placed in the loading groove 13, the side of the loading tray 41 close to the support column 42 (i.e., the lower surface of the loading tray 41) contacts the bottom surface of the loading groove 13, and the side of the loading tray 41 away from the support column 42 (i.e., the upper surface of the loading tray 41) is flush with the upper surface of the base plate 10. In this way, it can be ensured that when the sample 300 is placed on the loading tray 41, the lower surface of the sample 300 can still contact the contact electrode. The pad 50 is fixedly arranged on the lower surface of the base plate 10, and the pad 50 is used to support the base plate 10. The thickness of the pad 50 is greater than the length of the support column 42 extending out of the third through hole 131, so that the portion of the support column 42 exposed from the lower surface of the bottom plate 10 does not contact the experimental table where the magnetoacoustic imaging electrode contact device is placed, thereby ensuring that the upper surface of the sample tray 41 is flush with the upper surface of the bottom plate 10. In this embodiment, the setting of the sample stage 40 makes it more convenient to take and place the sample 300.

[0047] Exemplarily, the bottom plate 10 is a rectangular parallelepiped or a cube; the magnetoacoustic imaging electrode contact device includes four pads 50, which have the same thickness and are respectively arranged at the four corners of the lower surface of the bottom plate 10 to ensure the levelness of the bottom plate 10. Exemplarily, the pads 50 are made of hard insulating materials, and the pads 50 can be implemented by acrylic blocks of 50mm*50mm*50mm.

[0048] Continue to see Figure 1 On the basis of the above embodiments, optionally, the loading plate 41 and the support column 42 are both cylindrical, and the extension line of the central axis of the loading plate 41 coincides with the central axis of the support column 42; that is, the loading platform 40 as a whole is a cylindrical structure connected to a circular plate. The loading groove 13 and the third through hole 131 on the bottom plate 10 can also be cylindrical with their central axes coincident, so that the loading groove 13 and the third through hole 131 as a whole are in the shape of a circular hole with a truncated table. And the diameter of the loading groove 13 is slightly larger than the loading plate 41, and the diameter of the third through hole 131 is slightly larger than the support column 42, so as to facilitate the placement of the loading platform 40 on the bottom plate 10. At the same time, the cylindrical support column 42 is easier to rotate smoothly. By rotating the loading platform 40 to drive the sample on it to rotate, the measurement of different angles of the sample can be realized, or the angle of the tissue sample can be adjusted to make it in good contact with the contact electrode, thereby optimizing the measurement result. Exemplarily, the support column 42 can be rotated manually by the experimenter, or driven to rotate by a motor. The loading platform 40 can be made of a hard insulating material. The loading plate 41 can be made of a circular plate with a diameter of 80 mm and a thickness of 5 mm, and the supporting column 42 can be made of an acrylic round rod with a diameter of 20 mm and a length of 50 mm. The loading plate 41 and the supporting column 42 are bonded to form the loading platform 40 .

[0049] On the basis of the above embodiments, the magnetoacoustic imaging electrode contact device may further include: a rotating mechanism (not shown in the figure); the rotating mechanism is connected to the support column 42, and the rotating mechanism is used to control the stage 40 to rotate with the central axis of the support column 42 as the rotation axis. Specifically, the rotating mechanism may be a stepping motor, which drives the support column 42 to rotate in steps, thereby driving the sample tray 41 and the sample thereon to rotate.

[0050] On the basis of the above embodiments, optionally, the positional relationship between the two electrode grooves and the object-carrying groove 13 can be set according to actual needs. Figure 1 As shown, the first electrode groove 11, the loading groove 13 and the second electrode groove 12 are sequentially distributed along the length direction of the bottom plate 10; that is, the two electrode grooves are symmetrically arranged about the loading groove 13. The length direction of the bottom plate 10 can be the first direction X or the second direction Y.

[0051] Continue to see Figure 1On the basis of the above embodiments, optionally, a liquid injection port is further provided on the bottom plate 10. Specifically, the first liquid injection port 113 is provided from the side surface ( Figure 1 The second liquid injection port 123 extends from the side of the bottom plate 10 (shown as the left side) to the inner surface of the first electrode groove 11, serving as a liquid metal injection path for the first electrode groove 11. Figure 1 The right side is shown as the figure, and the two liquid inlets extend to the inner surface of the second electrode groove 12, serving as the liquid metal injection path of the second electrode groove 12. Compared with pouring liquid metal directly into the electrode groove, it is easier to control the injection amount of liquid metal through the liquid injection port. In addition, such a configuration facilitates the injection of liquid metal into the electrode groove after the sample is placed on the stage 40, reducing the restrictions on the order of the measurement steps. Exemplarily, both liquid inlets are cylindrical through holes with a diameter of 3 mm opened on the side of the bottom plate 10 and extending to the inner surface of the electrode groove.

[0052] It should be noted that the solution that the injection port extends from the side of the bottom plate 10 to the inner surface of the electrode groove is not a limitation of the present invention. In other embodiments, the opening of the injection port on the bottom plate 10 can also be arranged on the upper surface or the lower surface of the bottom plate 10 as required. There can be multiple injection ports opened in the same electrode groove. The inner surface of the electrode groove includes all its exposed surfaces, such as the bottom surface and the side walls.

[0053] Continue to see Figure 1 On the basis of the above-mentioned embodiments, optionally, a liquid outlet is further provided on the bottom plate 10 for discharging excess liquid metal in the electrode groove. Specifically, the first liquid outlet 114 extends from the side of the bottom plate 10 to the inner surface of the first electrode groove 11, serving as a liquid metal discharge path for the first electrode groove 11. The second liquid outlet 124 extends from the side of the bottom plate 10 to the inner surface of the second electrode groove 12, serving as a liquid metal discharge path for the second electrode groove 12. The number and setting positions of the liquid outlets can also be set according to actual needs and will not be repeated here. By way of example, both liquid outlets are cylindrical through holes with a diameter of 3 mm opened on the side of the bottom plate 10 and extending to the inner surface of the electrode groove.

[0054] Among them, in order to prevent the liquid metal from accidentally leaking from the liquid outlet when the liquid metal is injected into the electrode groove, the magnetoacoustic imaging electrode contact device can be equipped with a sealing plug, so that when the liquid metal is injected into the first electrode groove 11 and / or the second electrode groove 12, the sealing plug is inserted into the liquid outlet corresponding to the electrode groove to prevent the liquid metal from accidentally leaking. And, when the first electrode groove 11 and / or the second electrode groove 12 needs to discharge the liquid metal, the sealing plug is pulled out from the liquid outlet corresponding to the electrode groove. The number of sealing plugs can be equipped according to actual needs; at the same time, spare sealing plugs can be equipped in case of emergency. For example, the liquid inlet can also be reused as the liquid outlet, thereby reducing the openings on the bottom plate 10 and simplifying the preparation process.

[0055] On the basis of the above embodiments, optionally, a fourth through hole 112 is further provided at the bottom of the first electrode groove 11, and a fifth through hole 122 is further provided at the bottom of the second electrode groove 12. The magnetoacoustic imaging electrode contact device also includes: a first thermally conductive rod 31, which is arranged in the fourth through hole 112; a second thermally conductive rod 32, which is arranged in the fifth through hole 122. The gap between the thermally conductive rod 32 and the through hole can be sealed with thermally conductive silicone grease; the arrangement of the thermally conductive rod 32 in the through hole can refer to the columnar electrode, as long as it is ensured that the thermally conductive rod and the filler in the electrode groove can achieve good heat conduction, which will not be repeated here. Exemplarily, the fourth through hole 112 and the fifth through hole 122 are both cylindrical holes with a diameter slightly greater than or equal to 5 mm, and both thermally conductive rods can be implemented by using a 5 mm diameter stone mill rod coated with thermally conductive silicone grease.

[0056] And, the magnetoacoustic imaging electrode contact device also includes: a temperature controller 60 and a temperature sensor 70. Among them, the first end of the temperature controller 60 is connected to the first heat-conducting rod 31, and the second end of the temperature controller 60 is connected to the second heat-conducting rod 32. The temperature controller 60 is used to control the temperature of the liquid metal 101 in the two electrode grooves through the heat-conducting rod, thereby controlling the solidification process of the liquid metal 101. The first end of the temperature sensor 70 is connected to the first heat-conducting rod 31, and the second end of the temperature sensor 70 is connected to the second heat-conducting rod 31. The temperature sensor 70 is used to detect the temperature of the liquid metal 101 in real time through the heat-conducting rod, so that the temperature controller 60 controls the solidification process of the liquid metal 101 according to the measured temperature. Exemplarily, the first end of the temperature controller 60 is connected to the first heat-conducting rod 31 through a single-pole single-throw switch S3, and the second end of the temperature controller 60 is connected to the second heat-conducting rod 32 through a single-pole single-throw switch S4. The temperature controller 60 and the temperature sensor 70 can be connected to the bottom surface of the heat-conducting rod through a cable. Exemplarily, the temperature controller 60 is implemented by E300, and the temperature sensor 70 can be implemented by TJ36-CASS-116U-6.

[0057] On the basis of the above embodiments, optionally, the magnetoacoustic imaging electrode contact device further includes: an impedance meter 80 and an excitation source 90. The first end of the impedance meter 80 is electrically connected to the first columnar electrode 21, and the second end of the impedance meter 80 is electrically connected to the second columnar electrode 22. The impedance meter 80 can be used to detect the electrical contact state between the contact electrode and the sample 300. The first end of the excitation source 90 is electrically connected to the first columnar electrode 21, and the second end of the excitation source 90 is electrically connected to the second columnar electrode 22. The excitation source 90 is used to apply an excitation electrical signal to the sample 300 through the columnar electrode and the contact electrode. Among them, the impedance meter 80 and the excitation source 90 can be connected to the bottom surface of the columnar electrode through a cable. Exemplarily, the impedance meter 80 can be implemented by GM3110, and the excitation source 90 can be implemented by connecting AFG3252 to HSA4104.

[0058] On the basis of the above embodiments, the magnetoacoustic imaging electrode contact device may further include: a first selection switch S1 and a second selection switch S2. The first selection switch S1 and the second selection switch S2 are both two-choose-one switches (single-pole double-throw switches). The first end (fixed end) of the first selection switch S1 is electrically connected to the first columnar electrode 21, the second end (first selection end) of the first selection switch S1 is electrically connected to the first end of the impedance meter 80, and the third end (second selection end) of the first selection switch S1 is electrically connected to the first end of the excitation source 90. The first end (fixed end) of the second selection switch S2 is electrically connected to the second columnar electrode 22, the second end (first selection end) of the second selection switch S2 is electrically connected to the second end of the impedance meter 80, and the third end (second selection end) of the second selection switch S2 is electrically connected to the second end of the excitation source 90. Through the selection function of the selection switch, the impedance meter 80 or the excitation source 90 can be controlled to be electrically connected to the columnar electrode.

[0059] It should be noted that in order to show the structure near the bottom of the electrode groove in the drawings, the filling pattern of the filler in the electrode groove is made semi-transparent, and only the part of each component exposed from the bottom surface of the electrode groove is shown as an example.

[0060] Combine the following Figure 2-3 , the specific working process of using the magnetoacoustic imaging electrode contact device for experimental measurement is described. The working process includes the following steps:

[0061] 1. Place the sample 300 on the sample tray 41.

[0062] 2. Connect the fixed end of the first selection switch S1 to the first selection end, connect the fixed end of the second selection switch S2 to the first selection end, and disconnect the switch S3 and the switch S4.

[0063] 3. Use a sealing plug to block the liquid outlet, and inject liquid metal 101 into the electrode groove through the liquid injection port until the surface of the liquid metal is flush with the upper surface of the bottom plate 10; if an excessive amount of liquid metal 101 is injected during the injection, pull out the sealing plug from the liquid outlet to allow excess liquid metal 101 to be discharged from the liquid outlet; perform this operation on both electrode grooves.

[0064] The injection process of the liquid metal 101 into the two electrode grooves may be performed simultaneously or separately.

[0065] 4. Set the set temperature of the temperature controller 60 to 15 degrees, control the switch S3 and the switch S4 to be turned on, and transfer heat to the liquid metal through the heat conducting rod.

[0066] 5. Observe the reading of the temperature sensor 70. When the temperature reading drops to the set temperature of the temperature controller 60, proceed to the next step.

[0067] 6. Wait for the liquid metal 101 to completely solidify.

[0068] 7. Confirm that the fixed end of the first selection switch S1 is connected to the first selection end, and the fixed end of the second selection switch S2 is connected to the first selection end; read the reading of the impedance meter 80, and determine whether the sample 300 and the two contact electrodes form good electrical contact based on the reading of the impedance meter 80. If the contact is good, proceed directly to the next step; if the contact is poor, adjust the position of the sample 300 (for example, rotate the stage) until the sample 300 and the contact electrodes form good contact before proceeding to the next step.

[0069] 8. Connect the fixed end of the first selection switch S1 to the second selection end, and connect the fixed end of the second selection switch S2 to the second selection end.

[0070] 9. Control the output of the excitation source 90 and perform experimental measurements.

[0071] In summary, when the magnetoacoustic imaging electrode contact device is used for experimental measurement, it can be ensured that the experiment is carried out in a state where the sample 300 and the contact electrode are in good contact, thereby ensuring the experimental effect.

[0072] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0073] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A magnetoacoustic imaging electrode contact device, characterized in that: include: A bottom plate, a first columnar electrode, and a second columnar electrode; The upper surface of the bottom plate is provided with a first electrode groove and a second electrode groove, the bottom of the first electrode groove is provided with a first through hole, and the first columnar electrode is provided in the first through hole; the bottom of the second electrode groove is provided with a second through hole, and the second columnar electrode is provided in the second through hole; The first electrode groove and the second electrode groove are both used to inject liquid metal. The liquid metal in the first electrode groove forms a first contact electrode after solidification; the liquid metal in the second electrode groove forms a second contact electrode after solidification; when a sample for magnetoacoustic imaging is placed on the base plate, it contacts both the first contact electrode and the second contact electrode.

2. The magnetoacoustic imaging electrode contact device according to claim 1, characterized in that: The upper surface of the bottom plate is also provided with a loading groove, and the bottom of the loading groove is provided with a third through hole; The magnetoacoustic imaging electrode contact device further comprises: a stage and a pad; The stage comprises a fixedly connected sample tray and a support column; the support column is used to pass through the third through hole so that the sample tray is placed in the sample groove, a side of the sample tray close to the support column is in contact with the bottom surface of the sample groove, and a side of the sample tray away from the support column is flush with the upper surface of the bottom plate; the stage is used to carry the sample; The cushion block is fixedly disposed on the lower surface of the bottom plate, and is used to support the bottom plate; the thickness of the cushion block is greater than the length of the support column extending out of the third through hole.

3. The magnetoacoustic imaging electrode contact device according to claim 2, characterized in that: The loading plate and the supporting column are both cylindrical, and the extension line of the central axis of the loading plate coincides with the central axis of the supporting column.

4. The magnetoacoustic imaging electrode contact device according to claim 3, characterized in that: Also includes: Rotating mechanism; the rotating mechanism is connected to the supporting column, and the rotating mechanism is used to control the stage to rotate with the central axis of the supporting column as the rotating axis.

5. The magnetoacoustic imaging electrode contact device according to claim 2, characterized in that: The first electrode groove, the object-carrying groove and the second electrode groove are sequentially distributed along the length direction of the bottom plate.

6. The magnetoacoustic imaging electrode contact device according to claim 1, characterized in that: Also includes: an impedance meter; a first end of the impedance meter is electrically connected to the first columnar electrode, and a second end of the impedance meter is electrically connected to the second columnar electrode; Motivational source; A first end of the excitation source is electrically connected to the first columnar electrode, and a second end of the excitation source is electrically connected to the second columnar electrode.

7. The magnetoacoustic imaging electrode contact device according to claim 6, characterized in that: Also includes: a first selection switch and a second selection switch; The first end of the first selection switch is electrically connected to the first columnar electrode, the second end of the first selection switch is electrically connected to the first end of the impedance meter, and the third end of the first selection switch is electrically connected to the first end of the excitation source; A first end of the second selection switch is electrically connected to the second columnar electrode, a second end of the second selection switch is electrically connected to a second end of the impedance meter, and a third end of the second selection switch is electrically connected to a second end of the excitation source.

8. The magnetoacoustic imaging electrode contact device according to claim 1, characterized in that: A fourth through hole is further provided at the bottom of the first electrode groove, and a fifth through hole is further provided at the bottom of the second electrode groove; The magnetoacoustic imaging electrode contact device also includes: A first heat conducting rod is disposed in the fourth through hole; A second heat conducting rod is disposed in the fifth through hole; a temperature controller; a first end of the temperature controller is connected to the first heat-conducting rod, and a second end of the temperature controller is connected to the second heat-conducting rod; A temperature sensor; a first end of the temperature sensor is connected to the first heat-conducting rod, and a second end of the temperature sensor is connected to the second heat-conducting rod.

9. The magnetoacoustic imaging electrode contact device according to claim 1, characterized in that: Also includes: The first liquid injection port; The first liquid injection port extends from the side surface of the bottom plate to the inner surface of the first electrode groove; A second liquid injection port; The second liquid injection port extends from a side surface of the bottom plate to an inner surface of the second electrode groove.

10. The magnetoacoustic imaging electrode contact device according to claim 9, characterized in that: Also includes: A first liquid outlet; the first liquid outlet extends from the side of the bottom plate to the inner surface of the first electrode groove; A second liquid outlet; The second liquid outlet extends from the side surface of the bottom plate to the inner surface of the second electrode groove; A sealing plug; the sealing plug is used to be inserted into the liquid outlet corresponding to the electrode groove when the liquid metal is injected into the first electrode groove and / or the second electrode groove; and to be pulled out from the liquid outlet corresponding to the electrode groove when the liquid metal needs to be discharged from the first electrode groove and / or the second electrode groove.

Images