Method for detecting electrical parameters of dielectric sheet by using detection device

Abstract

The invention provides a method for detecting electrical parameters of a dielectric sheet by using a detection device, the method is used for detecting the dielectric sheet with a metal coating on one side, the detection device comprises a base and a top plate located on the base, the base is provided with a test cavity and a conductive sheet located at the bottom of the test cavity, and the test cavity is provided with an upper opening; the top plate is provided with a plurality of contact pins; the detection method comprises the following steps: S10, filling a conductive solution into a test cavity of a base without a top plate; s20, placing a dielectric sheet with a metal coating on one side at the upper opening of the test cavity in a manner that the metal coating is back to the base, and enabling the dielectric sheet to be in contact with the conductive solution; s30, the contact pin of the top plate is placed on the base in the mode that the contact pin faces the dielectric sheet, and the contact pin abuts against the metal coating; and S40, conducting the conductive sheet and the contact pin, and connecting a test instrument or a detection circuit to obtain the electrical parameters of the dielectric sheet. According to the method, the electrical parameters of the dielectric sheet can be accurately detected, and nondestructive detection can be realized.

Description

Technical Field

[0001] This application relates to a method for detecting the electrical parameters of a dielectric sheet using a detection device. Background Technology

[0002] Tumor electric field therapy (TEF) is a treatment method that uses an electric field generator to produce a low-intensity, medium-to-high-frequency, alternating electric field to interfere with the mitotic process of tumor cells. Studies have shown that TGF therapy is effective in treating glioblastoma, non-small cell lung cancer, and malignant pleural mesothelioma. The electric field applied in this treatment method can affect the aggregation of microtubules, prevent spindle formation, inhibit the mitotic process, and induce apoptosis in cancer cells.

[0003] Existing tumor electric field therapy systems mainly include an electric field generator that generates alternating electrical signals for tumor electric field therapy, an adapter electrically connected to the electric field generator, and multiple pairs of electrode pads electrically connected to the electric field generator via the adapter. The electric field generator transmits the alternating electrical signals for tumor electric field therapy to each pair of electrode pads through the adapter. The paired electrode pads are applied to the body surface on opposite sides of the patient's tumor region and are subjected to alternating electrical signals to generate an alternating electric field for tumor therapy between the paired electrode pads.

[0004] Electrode sheets are arrays primarily composed of circuit boards and dielectric sheets mounted on them. The electrical parameters of the dielectric sheets determine their performance, with relative permittivity and dielectric loss being two crucial criteria for evaluating these parameters. A reliable and convenient testing device is needed to measure these parameters. Currently, dielectric sheets on electrode sheets are typically cylindrical, with one of their upper or lower surfaces coated with a metal layer for soldering to the circuit board, while the other surface remains uncoated. Existing testing methods include two approaches. One method is only for dielectric sheets with a single-sided metal coating. In this method, a flexible conductive material, such as conductive gel, is first applied to the uncoated side, followed by a metal layer, creating a double-sided metal capacitor. The capacitance and resistance values ​​are then measured and converted into relative permittivity and dielectric loss. However, this method has low testing efficiency, and the accuracy of the measured capacitance and resistance values ​​is low due to difficulties in good contact between the flexible conductive material and the dielectric sheet, or due to the material's own high loss. Another testing device is for dielectric sheets with metal coatings on both sides. During testing, both sides of the dielectric sheet are coated with metal, and then the capacitance and resistance values ​​are measured by the instrument. After the test, the metal coating on one side needs to be peeled off. This is because when the dielectric sheet is used on the electrode sheet, only one side needs to be coated with metal, and peeling off the metal coating is relatively difficult. Therefore, this testing method is a destructive test.

[0005] Therefore, it is necessary to propose a new detection device and a method for conveniently, accurately, and reliably detecting the electrical parameters of a dielectric sheet with a metal coating on one side. Summary of the Invention

[0006] This application provides a convenient and non-destructive testing method for electrical parameters of dielectric sheets using a testing device.

[0007] Specifically, this application is achieved through the following technical solution: a method for detecting electrical parameters of a dielectric sheet using a detection device. The detection method is used to detect a dielectric sheet with a metal coating on one side. The detection device includes a base and a top plate located on the base. The base has a test cavity for containing a conductive solution and a conductive sheet located at the bottom of the test cavity. The test cavity has an upper opening. The top plate is provided with a plurality of contact pins for contacting the metal coating.

[0008] The detection method includes the following steps:

[0009] S10: Fill the test cavity of the base without the top plate installed with the conductive solution;

[0010] S20: The dielectric sheet to be tested, which has a metal coating on one side, is placed at the upper opening of the test cavity of the base with the metal coating facing away from the base, and the dielectric sheet is brought into contact with the conductive solution.

[0011] S30: Place the top plate on the base with its stylus facing the dielectric sheet to be tested and make the stylus contact the metal coating of the dielectric sheet;

[0012] S40: Connect the conductive sheet of the base and the contact pin of the top plate and connect them to a test instrument or detection circuit to obtain the electrical parameters of the dielectric sheet.

[0013] Furthermore, the test chamber has a lower opening, the inner wall of the base located in the test chamber has a first stepped surface, and the conductive sheet abuts against the first stepped surface and seals the lower opening.

[0014] Furthermore, the base has one or more limiting ribs surrounding the upper opening, the limiting ribs forming a limiting groove for positioning the dielectric sheet, and the dielectric sheet is placed in the limiting groove.

[0015] Furthermore, the top plate is provided with a stylus plate for fixing the stylus and a pressure plate for fixing the stylus plate. The pressure plate has a top wall and a recess located below the top wall. The stylus passes through the top wall and extends into the recess.

[0016] Furthermore, the bottom of the pressure plate has a second stepped surface located in the recess, and the second stepped surface abuts against the limiting rib when the top plate is placed and pressed.

[0017] Furthermore, the top plate is provided with a second lead electrically connected to the stylus, and the conductive sheet is provided with a first lead extending out of the test cavity; the first lead and the second lead are connected to a test instrument or detection circuit to obtain the electrical parameters of the dielectric sheet.

[0018] Furthermore, the test chamber has a depth between 0.5cm and 5cm.

[0019] Furthermore, the base includes a test platform, a liquid injection platform, and a connecting part. The test chamber is disposed within the test platform, the liquid injection platform has a cavity, and the connecting part connects the test platform and the liquid injection platform and has a pipe communicating with the cavity and the test chamber.

[0020] Furthermore, the injection stage is provided with an injection column for injecting conductive solution into the cavity. The conductive solution is injected into the cavity of the injection stage through the injection column and flows into the test chamber of the test platform through the pipe of the connecting part.

[0021] Furthermore, the test platform is also provided with a hollow drainage column, and the inner wall of the test chamber of the test platform is provided with a drainage port connecting the test chamber and the drainage column; the conductive solution forms a flow circulation in the base through the injection column and the drainage column so that the test chamber of the base is kept full of conductive solution.

[0022] Furthermore, after the dielectric sheet test is completed, the following step S50 is also included: lift the top plate and take out the dielectric sheet; then put in other dielectric sheets to be tested, and repeat steps S20 to S50 to test other dielectric sheets to be tested.

[0023] The detection method using the testing device in this application can accurately detect the electrical parameters of a dielectric sheet with a metal coating on one side, and can achieve non-destructive testing.

[0024] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0025] Figure 1 A perspective view of a detection device and dielectric sheet according to one embodiment of this application;

[0026] Figure 2 for Figure 1 Partial exploded perspective view of the detection device and dielectric sheet shown;

[0027] Figure 3 for Figure 1 An exploded view of the detection device and dielectric sheet shown.

[0028] Figure 4 For along Figure 1 The cross-sectional view obtained from line AA in the diagram;

[0029] Figure 5 This is a flowchart of a method for detecting the electrical parameters of a dielectric sheet using the detection device described in this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] The device comprises: a testing device 100, a base 1, a testing chamber 10, an upper opening 101, a lower opening 102, a first stepped surface 103, a drain port 104, a conductive sheet 11, a first lead wire 111, a testing platform 12, a limiting rib 121, a limiting groove 122, a drain column 123, a liquid injection platform 13, a cavity 131, a liquid injection column 132, a drain port 133, a connecting part 14, a pipe 141, a top plate 2, a stylus 21, a stylus plate 22, a pressure plate 23, a top wall 231, a recess 232, a through hole 233, a second stepped surface 234, a side wall 235, a second lead wire 24, a dielectric sheet 3, a metal coating 31, and a bottom surface 32. Detailed Implementation

[0032] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses, systems, devices, and methods consistent with some aspects of this application.

[0033] refer to Figures 1 to 3 As shown, the detection device 100 of this application includes a base 1 and a top plate 2 located on the base 1, which can be used to detect the electrical parameters of a dielectric sheet 3 with a metal coating 31 on one side. The top plate 2 is provided with a plurality of contact pins 21. The dielectric sheet 3 is placed between the base 1 and the top plate 2 with the metal coating 31 facing upwards. The base 1 is provided with a test chamber 10. The dielectric sheet 3 is located at the top of the test chamber 10. The test chamber 10 is provided with a conductive sheet 11 made of metal material at its bottom. A conductive solution is injected into the test chamber 10 to simultaneously contact the conductive sheet 11 and the dielectric sheet 3. The contact pins 21 of the top plate 2 press against the metal coating 31 of the dielectric sheet 3 to conduct the contact pins 21 and the dielectric sheet 3, thus forming a detection circuit through the dielectric sheet 3.

[0034] refer to Figure 2 and Figure 3 As shown, and in combination Figure 4As shown, the base 1 also includes a test platform 12, a liquid injection platform 13, and a connecting part 14. These three parts are integrally formed. The connecting part 14 is horizontally connected to the test platform 12 and the liquid injection platform 13. The test platform 12 is hollow to form the aforementioned test chamber 10. The liquid injection platform 13 is provided with a cavity 131. The connecting part 14 is provided with a pipe 141 connecting the test chamber 10 and the cavity 131. The conductive solution is injected into the cavity 131 and then enters the test chamber 10 through the pipe 141.

[0035] The test chamber 10 extends vertically through the test platform 12, forming an upper opening 101 at the top of the test platform 12 and a lower opening 102 at the bottom of the test platform 12. Several limiting ribs 121 are provided along the periphery of the upper opening 101 on the upper surface of the test platform 12. These limiting ribs 121 surround and form a limiting groove 122 for positioning the dielectric sheet 3. The limiting groove 122 is concentrically arranged with the upper opening 101, and its diameter is larger. Specifically, the limiting groove 122 matches the diameter of the dielectric sheet 3. The size of the dielectric sheet 3 is larger than the size of the upper opening 101 but smaller than or equal to the size of the limiting groove 122, to prevent the dielectric sheet 3 from shaking or falling into the test chamber 10 when placed in the limiting groove 112. The dielectric sheet 3 is located at the upper opening 101 of the test chamber 10 and is supported by the upper surface of the test platform 12 and limited by the limiting ribs 121. It is understood that the several limiting ribs 121 can also be replaced by continuously arranged annular limiting ribs. In this embodiment, the dielectric sheet 3 to be tested is a circular ceramic sheet. It is understood that the dielectric sheet 3 can also be other shapes. The shape of the limiting groove 122 can be adjusted accordingly to make it consistent with the shape of the dielectric sheet 3.

[0036] The lower opening 102 is a stepped hole. The test platform 12 is located on the inner wall of the test chamber 10 and has a first stepped surface 103 facing the lower opening 102. The conductive sheet 11 is housed in the lower opening 102 and abuts against the first stepped surface 103 to seal the lower opening 102, which can prevent the conductive solution in the test chamber 10 from leaking out of the base 1 during subsequent testing. The bottom surface of the conductive sheet 11 is connected to a first lead wire 111.

[0037] The test platform 12 is also equipped with a hollow drain column 123. A drain port 104 is formed on the inner wall of the test platform 12 at the test chamber 10, connecting the test chamber 10 and the internal space of the drain column 123. The height of the end of the drain column 123 furthest from the test platform 12 is equal to or higher than the upper opening 101 of the test chamber 10. The injection stage 13 is also equipped with a hollow injection column 132. The conductive solution enters through one end of the injection column 132 and flows out through the other end into the cavity 131, then enters the test chamber 10 through the pipe 141, and can be discharged from the test chamber 10 through the drain port 104 and the drain column 123. The inner wall of the injection stage 13 at the cavity 131 is also equipped with a drain port 133 communicating with the cavity 131, so that excess conductive solution in the injection stage 13 can flow out. The drain port 133 can also be omitted.

[0038] The top plate 2 also includes a stylus plate 22, a pressure plate 23, and a second lead wire 24. A plurality of stylus pins 21 are welded to the stylus plate 22. The second lead wire 24 is indirectly electrically connected to the stylus pins 21 through the stylus plate 22. Alternatively, the second lead wire 24 can be directly electrically connected to the stylus pins 21. The pressure plate 23 has a top wall 231, a side wall 235 extending downward from one side of the top wall 231, and a downwardly open recess 232 formed by the top wall 231 and the side wall 235. The top wall 231 has a through hole 233 through which the stylus pins 21 pass into the recess 232. During assembly, screws (not shown) pass through the stylus plate 22 and the pressure plate 23 to fix the stylus plate 22 and the pressure plate 23 together, with the stylus pins 21 protruding into the recess 232 of the pressure plate 23.

[0039] The side wall 235, located at the bottom of the recess 232, also forms a downward-facing second stepped surface 234. When the pressure plate 23 is placed on the base 1, the top of the test platform 12 can be inserted into the recess 232 to form a concave-convex positioning. The limiting rib 121 of the test platform 12 abuts against the second stepped surface 234 to form a limit, preventing damage to the dielectric sheet 3 caused by excessive downward pressure of the contact pin 21 of the top plate 2. The contact pin 21 located in the recess 232 can press against the dielectric sheet 3 placed on the test platform 12. The contact pin 21 has an elastic telescopic structure, which can prevent the contact pin 21 from damaging the dielectric sheet 3.

[0040] During testing, the dielectric sheet 3 is first placed in the limiting groove 122 of the test platform 12 with the metal coating 31 facing upwards, and the bottom surface 32 of the dielectric sheet 3 without the metal coating is exposed in the test chamber 10. Then, the top plate 2 is placed on the base 1, so that the contact pin 21 of the top plate 2 contacts the metal coating 31 of the dielectric sheet 3. Finally, a conductive solution is injected into the cavity 131 of the injection stage 13 until the conductive solution in the test chamber 10 contacts the bottom surface 32 of the dielectric sheet 3, thus connecting the dielectric sheet 3 and the conductive sheet 11 to form a detection circuit. The conductive sheet 11 and the metal coating 31 of the dielectric sheet 3 form a capacitor. The intermediate dielectric of the capacitor contains a conductive solution with high conductivity and a dielectric sheet 3 with unknown parameters. The capacitance and resistance of the dielectric sheet 3 can be accurately detected using an instrument (not shown), and this is a non-destructive test.

[0041] The conductive solution can be a high-concentration, safe, non-toxic, and non-corrosive solution, such as potassium chloride solution or sodium chloride solution, with a conductivity of over 20 S / m. The type and concentration of the conductive solution need to be calculated to ensure that the resistance of the conductive solution itself is as low as possible compared to the resistance of the dielectric sheet 3 under test, thereby achieving high detection accuracy without damaging the dielectric sheet 3.

[0042] Furthermore, utilizing gravitational potential energy, the conductive solution flowing into the injection stage 13 and the conductive solution exiting the drain outlet 104 are essentially balanced. One end of the injection column 132 can be connected to a flexible tube (not shown) and a water pump (not shown), allowing the conductive solution to circulate. The dielectric sheet 3 to be tested can then be repeatedly placed for testing, making the testing more convenient. After the conductive solution begins circulating, a testing instrument or a self-made detection circuit can be used to connect the first lead 111 and the second lead 24 to form a circuit, allowing the capacitance and resistance of the dielectric sheet 3 to be tested. After testing, the dielectric sheet 3 is removed, cleaned with water, and dried. Typically, the depth of the test chamber 10 is between 0.5cm and 5cm, and the shape of the test chamber 10 is consistent with the contour shape of the dielectric sheet 3. The electrical parameters of the conductive solution, the first lead 111, and the second lead 24 can be obtained through calculation or actual measurement, serving as a test bias for more accurate measurement of the electrical parameters of the dielectric sheet 3. Optionally, two additional leads can be added to form the Kelvin test method, which can further improve the accuracy. This method is quite common in the industry and will not be elaborated further.

[0043] Combination Figure 5 As shown, this application also provides a method for detecting the electrical parameters of the dielectric sheet 3 using the aforementioned detection device 100, which includes the following steps:

[0044] S10: Fill the test cavity 10 of the base 1 without the top plate 2 into the conductive solution;

[0045] S20: Place the dielectric sheet 3 with a metal coating on one side to be tested at the upper opening 101 of the test cavity 10 of the base 1 with its metal coating 31 facing away from the base 1, and make the dielectric sheet 3 contact the conductive solution.

[0046] S30: Place the top plate 2 on the base 1 with its contact pin 21 facing the dielectric sheet 3 to be tested and make the contact pin 21 contact the metal coating 31 of the dielectric sheet 3;

[0047] S40: Connect the conductive sheet 11 of the base 1 and the contact pin 21 of the top plate 2 and connect them to a test instrument or detection circuit to obtain the electrical parameters of the dielectric sheet 3.

[0048] After the dielectric sheet 3 is tested, the following step S50 is also included: lifting the top plate and removing the dielectric sheet. If it is necessary to continue testing other dielectric sheets 3 to be tested, steps S20 to S50 can be repeated to test other dielectric sheets to be tested.

[0049] The dielectric sheet 3 with a single-sided metal coating 31 is a component of an electrode sheet (not shown) for tumor electric field therapy. The electrode sheet (not shown) includes a flexible circuit board (not shown) and the dielectric sheet 3 disposed on the flexible circuit board (not shown). The metal coating 31 of the dielectric sheet 3 faces the flexible circuit board (not shown) and is electrically connected to the flexible circuit board (not shown). Pairs of electrode sheets (not shown) are applied to the body surface on opposite sides of the patient's tumor area. An electric field generating device (not shown) directly or indirectly transmits an alternating electric signal for tumor electric field therapy to each pair of electrode sheets (not shown) through an adapter (not shown) to generate a mid-frequency (e.g., 50 kHz to 1 MHz), low-intensity alternating electric field for tumor therapy between the pairs of electrode sheets (not shown) to perform electric field therapy on the corresponding tumor site.

[0050] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for detecting electrical parameters of a dielectric sheet using a detection device, the method being used to detect dielectric sheets with a metal coating on one side, characterized in that: The detection device includes a base and a top plate on the base. The base has a test chamber for containing a conductive solution and a conductive sheet at the bottom of the test chamber. The test chamber has an upper opening. The top plate is provided with a plurality of contact pins for contacting the metal coating. The detection method includes the following steps: S10: Fill the test cavity of the base without the top plate installed with the conductive solution; S20: The dielectric sheet to be tested, which has a metal coating on one side, is placed at the upper opening of the test cavity of the base with the metal coating facing away from the base, and the dielectric sheet is brought into contact with the conductive solution. S30: Place the top plate on the base with its stylus facing the dielectric sheet to be tested and make the stylus contact the metal coating of the dielectric sheet; S40: Connect the conductive sheet of the base and the contact pin of the top plate and connect them to a test instrument or detection circuit to obtain the electrical parameters of the dielectric sheet.

2. The method according to claim 1, characterized in that: The test chamber has a lower opening, and the inner wall of the base located in the test chamber has a first stepped surface. The conductive sheet abuts against the first stepped surface and seals the lower opening.

3. The method according to claim 1, characterized in that: The base has one or more limiting ribs surrounding the upper opening, the limiting ribs forming a limiting groove for positioning the dielectric sheet, and the dielectric sheet is placed in the limiting groove.

4. The method according to claim 3, characterized in that: The top plate is provided with a stylus plate for fixing the stylus and a pressure plate for fixing the stylus plate. The pressure plate has a top wall and a recess located below the top wall. The stylus passes through the top wall and extends into the recess.

5. The method according to claim 4, characterized in that: The bottom of the pressure plate has a second stepped surface located in the recess, and the second stepped surface abuts against the limiting rib when the top plate is placed and pressed.

6. The method according to claim 1, characterized in that: The top plate is provided with a second lead that is electrically connected to the stylus, and the conductive sheet is provided with a first lead that leads out of the test cavity; the first lead and the second lead are connected to a test instrument or detection circuit to obtain the electrical parameters of the dielectric sheet.

7. The method according to claim 1, characterized in that: The test chamber has a depth between 0.5cm and 5cm.

8. The method according to claim 1, characterized in that: The base includes a test platform, a liquid injection station, and a connecting part. The test chamber is located inside the test platform. The liquid injection station has a cavity. The connecting part connects the test platform and the liquid injection station and has a pipe that communicates with the cavity and the test chamber.

9. The method according to claim 8, characterized in that: The injection stage is equipped with an injection column for injecting conductive solution into the cavity. The conductive solution is injected into the cavity of the injection stage through the injection column and flows into the test chamber of the test platform through the pipe of the connecting part.

10. The method according to claim 9, characterized in that: The test platform is also equipped with a hollow drainage column. The test platform has a drainage port on the inner wall of the test chamber that connects the test chamber and the drainage column. The conductive solution flows and circulates in the base through the injection column and the drainage column to keep the test chamber of the base full of conductive solution.

11. The method according to claim 10, characterized in that: After the dielectric sheet test is completed, the following step S50 is also included: lift the top plate and take out the dielectric sheet; then put in other dielectric sheets to be tested, and repeat steps S20 to S50 to test other dielectric sheets to be tested.

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