A device for measuring a three-dimensional electric field distribution

Abstract

The present invention provides a measuring device for three-dimensional electric field distribution, which includes three groups of transmitting electrodes and a pair of test electrodes. The three groups of transmitting electrodes are respectively fixed on three mutually orthogonal planes. Each group of transmitting electrodes consists of two pairs of electrodes, and two sinusoidal alternating current signals in the kilohertz range with slightly different frequencies are introduced, forming a phase interference electric field in the three-dimensional space between the two pairs of electrodes. During measurement, the three groups of transmitting electrodes alternately output electrical signals in sequence, which is equivalent to rotating the transmitting electrodes. The test electrodes can move arbitrarily in space. When each group of transmitting electrodes works, the electric field intensity components of each point in space in the corresponding direction can be measured; after the three groups of transmitting electrodes work alternately, the electric field intensities in three directions can be measured. The feature of the present invention is that only a pair of test electrodes are used, and by using the equivalent rotation of the transmitting electrodes, the electric field intensities in three directions at each point in space can be obtained. This measuring device can be used to measure the electric field intensities in the three directions of the X, Y, and Z axes at each point of the phase interference electric field.

Description

Technical Field

[0001] This invention belongs to the field of biomedical instrument technology, specifically relating to a three-dimensional electric field distribution measurement device, which is used to easily measure the three-dimensional electric field distribution of phase interference electric field using a pair of test electrodes. Background Technology

[0002] In the fields of medicine and sports fitness, low-frequency electric field stimulation is widely used to improve and enhance muscle function. However, there are two key issues in the application of low-frequency electric field stimulation: (1) the distribution of the electric field in the tissue: that is, how to measure or calculate the magnitude and direction of the electric field at each point in the tissue; (2) the effect of the electric field on the tissue: this involves research at the medical and biological level, that is, how an electric field of a specific magnitude and direction affects the tissue.

[0003] This invention primarily focuses on the problem of measuring electric fields in space. An electric field is a vector, and its three-dimensional distribution needs to represent the electric field intensity (containing three components) at every point in the tissue. A pair of test electrodes can measure the electric field in one direction. Theoretically, measuring a three-dimensional electric field requires three pairs of orthogonal electrodes. However, to reduce interference from the test electrodes to the original electric field, the geometric dimensions of the test electrodes should be as small as possible. Reducing the number of electrodes can decrease interference, but it restricts the measurement direction, making three-dimensional electric field measurement difficult.

[0004] The existing research methods have the following limitations: (1) Simulation calculation: The components of the electric field in the three directions of XYZ and their focusing range are not fully considered, which in turn cause different biological effects on anisotropic tissues; (2) Actual measurement: Only two pairs of orthogonal electrodes are used to measure the two-dimensional plane electric field, which cannot fully reflect the three-dimensional distribution of the electric field.

[0005] In addition, existing alternative measurement methods each have their own advantages and disadvantages: (1) Planar field measurement: only applicable to two-dimensional electric field measurement in a homogeneous medium; (2) In vivo measurement: mainly performed in animal models, but there are differences from human measurement results; (3) Human measurement: dependent on patients with implanted therapeutic electrodes, but the electrode position is fixed and the measurement data is limited; (4) Post-mortem measurement: the physicochemical properties of the tissue have changed, and the measurement results do not match the actual situation.

[0006] Therefore, elucidating the three-dimensional electric field distribution of the phase interference electric field is crucial for the mechanism research and practical application of this technology, but there is currently no fast and simple method for measuring the three-dimensional electric field distribution of the phase interference electric field. Summary of the Invention

[0007] To address the aforementioned problems, this invention proposes a novel phase interference electric field three-dimensional electric field distribution measurement device. Its core advantage lies in requiring only a pair of measuring electrodes. By rotating the transmitting electrode, the test direction is effectively changed, thereby measuring the three components of the vector field and achieving simple three-dimensional electric field distribution measurement. Simultaneously, this invention integrates stimulus signal output, a rapid and precise moving structure, a stable fixing device, and voltage signal acquisition functions. It can quickly adjust the spatial position of the test electrode and the transmitting electrode and independently control the output of two kilohertz-level AC signals. The system is stable, easy to operate, and facilitates real-time observation.

[0008] This invention provides an efficient and reliable solution for measuring the three-dimensional electric field distribution of phase interference electric fields, and has significant scientific research and application value.

[0009] Terminology Explanation

[0010] Three-dimensional electric field distribution: refers to the electric field intensity of the phase interference electric field at any point in space in the three directions of the X, Y and Z axes at that point.

[0011] The testing principle of this invention is to measure the electric field intensity in three directions of the vector electric field using only a pair of test electrodes by rotating the transmitting electrodes. The specific theoretical analysis is as follows:

[0012] The test electrode of this invention adopts a single-pair electrode design, which has the following advantages compared with the traditional scheme using multiple pairs of electrodes: Theoretically, measuring the three-dimensional electric field distribution requires three pairs of test electrodes. The spacing between each pair of electrodes is small (preferably 3-5 mm in this invention), resulting in a weak potential difference signal between the electrodes, which must be measured with the aid of an amplifier. The electric field strength is the ratio of the potential difference between the electrodes to the distance. If three pairs of test electrodes are used, in order to reduce the relative error of the measurement in each direction, it is necessary to ensure that the amplification performance of the three amplifiers is completely consistent, and the spacing between each pair of electrodes is strictly equal. However, adjusting the performance of multiple amplifiers to be consistent and precisely controlling the spacing of multiple pairs of test electrodes is difficult in practice. In contrast, this invention uses a pair of test electrodes in conjunction with a rotating emitting electrode to measure the electric field components in three directions, without needing to obtain the absolute value of the electric field in each direction at each point. Since only a pair of test electrodes and one amplifier are used, the stringent requirements for the consistency of multiple amplifiers and the accuracy of the spacing of multiple pairs of test electrodes are avoided, significantly reducing the system complexity and debugging difficulty.

[0013] In the OXYZ coordinate system, the positions of the four emitting electrodes S1, S2, S3, S4 and the two test electrodes T1, T2 are as follows: Figure 1 To distinguish it from the O′X′Y′Z′ coordinate system and the O″X″Y″Z″ coordinate system mentioned later, the OXYZ coordinate system is referred to as the absolute coordinate system in this paper.

[0014] The emitting electrodes S1, S2, S3, and S4 lie in the OXY plane, and their corresponding coordinates are...

[0015] S1(r / 2, r / 2, 0)

[0016] S2(-r / 2, r / 2, 0)

[0017] S3(-r / 2, -r / 2, 0)

[0018] S4(r / 2, -r / 2, 0)

[0019] The corresponding coordinates of test electrodes T1 and T2 are:

[0020] T1(X t ,Y t Z t -d / 2)

[0021] T2(X t Y t Z t +d / 2)

[0022] The coordinates of the center point T of the line connecting test electrodes T1 and T2 are:

[0023] T(X t Y t Z t )

[0024] The potential difference between the two test electrodes T1 and T2 is Then in T(X) t Y t Z t The electric field intensity in the Z direction at point () has a magnitude of

[0025] Electric field strength is a vector quantity. The above measurement was performed in the Z direction. The measurement principles for the other two directions are as follows.

[0026] Rotate the OXYZ coordinate system around the X-axis. Facing the direction of the X-axis arrow (i.e., facing the ⊙ direction), rotate counterclockwise by π / 2 to obtain a new coordinate system O′X′Y′Z′. The emitting electrodes S1, S2, S3, and S4 rotate with the OXYZ coordinate system, while the testing electrodes T1 and T2 do not. Figure 2 A.

[0027] The four transmitting electrodes S1, S2, S3, and S4 in the OXYZ coordinate system are S′1, S′2, S′3, and S′4 in the O′X′Y′Z′ coordinate system, and the two testing electrodes T1 and T2 are T′1 and T′2 in the O′X′Y′Z′ coordinate system.

[0028] The coordinates of the emitting electrodes S′1, S′2, S′3, and S′4 in the O′X′Y′Z′ coordinate system are:

[0029] S′1(r / 2, 0,r / 2)

[0030] S′2(-r / 2,0,r / 2)

[0031] S′3(-r / 2,0,-r / 2)

[0032] S′4(r / 2, 0, -r / 2)

[0033] The coordinates of test electrodes T′1 and T′2 in the O′X′Y′Z′ coordinate system are:

[0034] T′1(X t Y t Z t -d / 2)

[0035] T′2(X t ,Y t Z t +d / 2)

[0036] The coordinates of the center point T′ of the test electrodes T′1 and T′2 in the O′X′Y′Z′ coordinate system are:

[0037] T′(X t Y t Z t )

[0038] Rotate the new coordinate system O′X′Y′Z′ around the X′ axis. Facing the direction of the arrow on the X′ axis (i.e., facing the ⊙ direction), rotate counterclockwise by -π / 2, which is equivalent to rotating clockwise by π / 2, to return to the OXYZ coordinate system. Figure 2 The transmitting electrodes S′1, S′2, S′3, and S′4 in the O′X′Y′Z′ coordinate system, as well as the testing electrodes T′1 and T′2, rotate along with the coordinate system. The coordinates of S′1, S′2, S′3, and S′4 in the O′X′Y′Z′ coordinate system after rotation are as follows in the OXYZ coordinate system:

[0039] S1(r / 2, r / 2, 0)

[0040] S2(-r / 2, r / 2, 0)

[0041] S3(-r / 2, -r / 2, 0)

[0042] S4(r / 2, -r / 2, 0)

[0043] The corresponding coordinates of test electrodes T′1 and T′2 in the OXYZ coordinate system after rotation are:

[0044] T1(X t Z t -d / 2, -Yt )

[0045] T2(X t Z t +d / 2, -Y t )

[0046] The potential difference between the two test electrodes T1 and T2 is Then in T(X) t Z t -Y t The direction of the electric field intensity at point () is the Y direction, and its magnitude is

[0047] The position T(X) of the test electrode in the absolute coordinate system t Y t Z t There was no change; the only difference was that the emitting electrode was rotated counterclockwise by π / 2 in the direction of the X-axis arrow, creating a new O′X′Y′Z′ coordinate system. Therefore, the testing electrode measured the potential difference between T′1 and T′2 in the O′X′Y′Z′ coordinate system, obtaining the electric field strength at point T′. This is equivalent to measuring the electric field strength at another point T(X) in the absolute coordinate system OXYZ. t Z t -Y t The electric field strength in the Y direction is the key point of this invention.

[0048] Therefore, the four emitting electrodes S1, S2, S3, and S4 are moved to S′1, S′2, S′3, and S′4, and the test electrodes T′1 and T′2 are at T′(X t Y t Z t The electric field strength measured at point X is equivalent to the electric field strength measured at points S′1, S′2, S′3, and S′4 when the test electrodes T1 and T2 are at points T(X). t Z t ,′-Y t The electric field strength in the Y direction measured at point ).

[0049] Similar to the electric field strength test in the Y direction, the electric field strength test in the X direction is as follows.

[0050] Rotate the OXYZ coordinate system around the Y-axis. Facing the direction of the Y-axis arrow (i.e., facing the ⊙ direction), rotate counterclockwise by π / 2 to obtain a new coordinate system O″X″Y″Z″. The emitting electrodes S1, S2, S3, and S4 rotate with the OXYZ coordinate system, while the testing electrodes T1 and T2 do not. Figure 3 A.

[0051] The four transmitting electrodes S1, S2, S3, and S4 in the OXYZ coordinate system are S″1, S″2, S″3, and S″4 in the O″X″Y″Z″ coordinate system, and the two test electrodes T1 and T2 are T″1 and T″2 in the O″X″Y″Z″ coordinate system.

[0052] The coordinates of the emitting electrodes S″1, S″2, S″3, and S″4 in the O″X″Y″Z″ coordinate system are:

[0053] S″1(0,r / 2,-r / 2)

[0054] S″2(0, r / 2, r / 2)

[0055] S″3(0,-r / 2,r / 2)

[0056] S″4(0, -r / 2, -r / 2)

[0057] The coordinates of test electrodes T″1 and T″2 in the O″X″Y″Z″ coordinate system are:

[0058] T″1(X t ,Y t Z t -d / 2)

[0059] T″2(X t Y t Z t +d / 2)

[0060] The coordinates of the center point T″ of the test electrodes T″1 and T″2 in the O″X″Y″Z″ coordinate system are:

[0061] T″(X t Y t Z t )

[0062] Rotate the new coordinate system O″X″Y″Z″ around the Y″ axis. Facing the direction of the Y″ axis arrow (i.e., facing the ⊙ direction), rotate counterclockwise by -π / 2, which is equivalent to rotating clockwise by π / 2 to return to the OXYZ coordinate system. Figure 3 The emitting electrodes S″1, S″2, S″3, S″4 and the test electrodes T″1, T″2 in the O″X″Y″Z″ coordinate system rotate together with the coordinate system. The coordinates of S″1, S″2, S″3, S″4 in the O″X″Y″Z″ coordinate system after rotation are as follows in the OXYZ coordinate system:

[0063] S1(r / 2, r / 2, 0)

[0064] S2(-r / 2, r / 2, 0)

[0065] S3(-r / 2, -r / 2, 0)

[0066] S4(r / 2, -r / 2, 0)

[0067] The corresponding coordinates of test electrodes T″1 and T″2 in the OXYZ coordinate system after rotation are:

[0068] T1(-Z t +d / 2,Y t X t )

[0069] T2(-Z t -d / 2, Y t X t )

[0070] The potential difference between the two test electrodes T1 and T2 is Then in T(-Z) t Y t X t The direction of the electric field intensity at point () is the X-direction, and its magnitude is Note the negative sign here. Because point T2 is smaller than point T1 on the X-axis, meaning the electric field strength is in the opposite direction of the X-axis, it is described as being in the X-direction. The negative sign is added before its magnitude. See [link to documentation]. Figure 3 B.

[0071] The position T(X) of the test electrode in the absolute coordinate system t Y t Z t There was no change; the only difference was that the emitting electrode was rotated counterclockwise by π / 2 in the direction of the Y-axis arrow, creating a new O″X″Y″Z″ coordinate system. Therefore, the testing electrode measured the potential difference between T1″ and T2″ in the O″X″Y″Z″ coordinate system, obtaining the electric field strength at point T″. This is equivalent to measuring another point T(-Z) in the absolute coordinate system OXYZ. t Y t X t The electric field strength in the X direction is given by adding a negative sign before the value, which is the key point of this invention.

[0072] Therefore, the four emitting electrodes S1, S2, S3, and S4 are moved to S″1, S″2, S″3, and S″4, and the test electrodes T″1 and T″2 are at T″(X). t Y t Z t The electric field strength measured at point () is equivalent to the electric field strength measured at points S″1, S″2, S″3, and S″4 when the test electrodes T1 and T2 are at points T(-Z). t Y t X t The negative value of the electric field strength in the X direction measured at point ).

[0073] The above describes the initial positions of the test electrodes at points T1(X,Y,Zd / 2) and T2(X,Y,Z+d / 2) when the test point is (X,Y,Z). Similar to the above derivation, the initial positions of the test electrodes can also be at points T1(Xd / 2,Y,Z) and T2(X+d / 2,Y,Z), or T1(X,Yd / 2,Z) and T2(X,Y+d / 2,Z).

[0074] Using the above method, a pair of test electrodes, i.e., two electrodes, are placed in the absolute coordinate system OXYZ coordinate system T1(X). t Y t Z t -d / 2) and T2(X t Y t Z t By rotating the transmitting electrode along the X and Y axes at point +d / 2, the electric field in the X, Y, and Z directions (equivalent to the absolute coordinate system OXYZ) at three different points can be measured. The differences in the absolute coordinate system OXYZ corresponding to these three directions are as follows:

[0075] Point corresponding to the X direction: T(-Z) t Y t X t )

[0076] Point corresponding to the Y direction: T(X) t Z t -Y t )

[0077] Point corresponding to the Z direction: T(X) t Y t Z t )

[0078] By using a stepper motor to move a pair of test electrodes in three-dimensional space while rotating the transmitting electrode, the electric field intensity in one direction at each point can be measured, thus obtaining the electric field intensity in three directions at each point in the absolute coordinate system OXYZ space, i.e., the vector electric field intensity.

[0079] This invention provides a three-dimensional electric field distribution measurement device. The device includes three sets of emitting electrodes and a pair of test electrodes. The three sets of emitting electrodes are fixed on three mutually orthogonal planes. Each set of emitting electrodes independently controls the output of two AC signals. The three sets of emitting electrodes output signals alternately in sequence. The test electrode can move arbitrarily in space to measure the electric field intensity at each test point. In this invention, the three mutually orthogonal planes are the OXY, OYZ, and OXZ planes.

[0080] Each of the above-mentioned transmitting electrodes has two pairs of electrodes, which independently output two kilohertz-level AC signals.

[0081] The aforementioned test electrodes are suspended vertically, and each test electrode is either a coaxial cable or two strands of enameled wire. The upper end of each test electrode is connected to a signal amplifier. In a specific embodiment, if a coaxial cable is used, 3-5 mm of its lower outer conductor is stripped, exposing a circular cross-section, which serves as one electrode. The inner conductor extends downwards relative to the outer conductor by 3-5 mm, exposing a circular cross-section, which serves as the other electrode, thus forming a pair of test electrodes distributed vertically between the exposed inner and outer conductors. The inner and outer conductors at the upper end of the coaxial cable are connected to the input terminal of a signal amplifier. In another specific embodiment, two strands of enameled wire are used. The two strands are intertwined, then cut off at the lower end and forked by 3-5 mm, exposing a circular cross-section, forming a pair of horizontally distributed test electrodes. The upper end of the enameled wire is connected to the input terminal of the signal amplifier.

[0082] The aforementioned measuring device includes a linear electric slide module and a fixing module. The linear electric slide module includes a first slide, a second slide, and a third slide. Each slide includes a linear guide rail and a slider. The bottom of the first slide is fixed to the fixing module. The bottom of the second slide is connected and fixed to the slider of the first slide. The bottom of the third slide is connected and fixed to the slider of the second slide. The three linear guide rails are orthogonal to each other. The linear electric slide module can move in the XYZ axes.

[0083] The aforementioned measuring device also includes a fixing bracket for the test electrode, which is fixed on the fixing bracket. The fixing bracket for the test electrode is fixedly connected to the slider of the third slide, and the fixing bracket for the test electrode can move arbitrarily along the XYZ axes.

[0084] Assuming the first slide is in the X-axis direction, the slider of the first slide moves along the X-axis under the control of the stepper motor, which drives the second and third slides and the fixed support of the test electrode to move. Usually, it is not necessary to move the first slide during the test. By moving the other slides and the fixed support of the test electrode, the vector electric field intensity at any point in space can be measured.

[0085] The aforementioned fixing module includes a fixing frame, fixing rods, fixing clamps, a base plate, multiple optical plates, a lifting platform, and a cylindrical container;

[0086] The fixing frame is an integral frame structure, consisting of a top plate and a support plate. The center area of ​​the top plate of the fixing frame is hollowed out, and several fixing holes are distributed around it. The four corners of the top plate are supported by vertical support plates of a certain thickness, so that the fixing frame is placed vertically and stably on the optical plate.

[0087] The fixing rod consists of cuboid blocks at both ends and a vertical rod in the middle; each of the cuboid blocks at both ends of the fixing rod has two symmetrically distributed fixing holes, the diameter and spacing of which are adapted to the fixing holes on the top and bottom plates of the fixing frame, for connecting the fixing frame and the bottom plate, so that the fixing rod is vertically fixed between the top and bottom plates of the fixing frame; the vertical rod has several small holes evenly distributed on it, the diameter of which is similar to the diameter of the metal rod of the emitting electrode;

[0088] The fixing clip is a rectangular block with a certain thickness; the left and right sides of the fixing clip have a through hole, and the upper side opens from top to bottom at the center line. The middle section of the opening is cylindrical and hollow, and its diameter is similar to the diameter of the metal rod of the emitting electrode.

[0089] Several fixing holes are distributed around the central area of ​​the base plate;

[0090] The fixed frame, fixed rod, fixed clamp and base plate are used together to form a support body, which provides fixed positions for the three sets of emitting electrodes. The metal rod of the emitting electrode is passed through the small hole on the vertical rod of the fixed rod, and then the metal rod is fixed in the cylindrical hollow of the fixed clamp to clamp and fix the emitting electrode.

[0091] The multiple optical plates form a base, with a larger optical plate as the main body. Two smaller optical plates are fixed to the sides of the larger rectangular optical plate with screws as extension arms. The three are placed together on a workbench. Another optical plate is placed separately on a lower workbench. Three slides are mounted on the larger optical plate. A lifting platform and a cylindrical container are fixed on the lower optical plate. The cylindrical container is fixed on the lifting platform. The lifting platform and the cylindrical container constitute a liftable insulation test container.

[0092] The aforementioned lifting platform includes a handwheel, a high-precision ruler, and a worktable. Fixing holes are evenly distributed on the worktable, and the area of ​​the worktable is similar to the bottom surface of the cylindrical container. The cylindrical container is vertically fixed on the worktable of the lifting platform, and the two form a whole. The spatial position of the cylindrical container can be changed by adjusting the handwheel of the lifting platform.

[0093] The aforementioned fixing frame, fixing rod, fixing clamp, base plate, and cylindrical container are all made of insulating, waterproof, and highly rigid materials. All structures immersed in the liquid conductive medium inside the cylindrical container are connected by plastic screws.

[0094] In a specific embodiment, the optical plate is rectangular or square.

[0095] Furthermore, the aforementioned measuring device includes an electrical signal transmission module, a voltage signal acquisition module, a movement module, and a control module;

[0096] The electrical signal transmission module includes a signal generator, two signal amplifiers, three relays, and three sets of transmitting electrodes. The signal generator is connected to the signal amplifiers, and each signal amplifier is connected to each of the relays in pairs. Each relay is connected to a voltage amplifier follower and the transmitting electrodes. The signal generator, the first signal amplifier, and the second signal amplifier are used to generate and output two independent electrical stimulation signals. The first, second, and third relays receive the two electrical stimulation signals respectively and, in response to the control signal of the control module, control the signal paths of the first, second, and third sets of transmitting electrodes to be switched on and off respectively. The control signal is configured to turn on any one of the first, second, and third relays, while turning off the other two, so that the set of transmitting electrodes corresponding to the switched-on relay outputs an electrical stimulation signal, while the other two sets of transmitting electrodes do not output electrical stimulation signals, thus allowing the electrical stimulation signals to be output sequentially.

[0097] The voltage signal acquisition module is used to measure the three-dimensional electric field distribution at any point in the three-dimensional electric field space. The voltage signal acquisition module includes a test electrode, a fixing bracket for the test electrode, wires, and a third signal amplifier. The end of the extension arm of the fixing bracket for the test electrode opens from the outside to the inside, and several through holes are evenly distributed on the left and right sides, which can be used to vertically fix the test electrode. Several U-shaped wire clamps are installed on the upper surface of the extension arm of the fixing bracket for the test electrode to fix the wires of the test electrode.

[0098] The moving module is used for automated and precise movement of the test electrode. The moving module includes three stepper motor drivers, three stepper motors, and three slides. Each stepper motor is connected at both ends to a stepper motor driver and a slide. The three stepper motor drivers receive control signals from the control module and independently control the rotational speed and direction of the three stepper motors. The first, second, and third stepper motors drive the sliders on the first, second, and third slides to move. The slider of the third slide is used to fix a mounting bracket for the test electrode. By controlling the movement of the three stepper motors, the moving module can precisely move the test electrode in the XYZ axes to change its spatial position.

[0099] The control module includes a central processing unit (CPU), input / output devices, and seven voltage amplification followers for outputting control signals and analyzing and processing voltage signals. The CPU is connected to the input / output devices. The control module is configured to: output a control program through the input / output devices, which are connected to the seven voltage amplification followers and transmit control signals to the electrical signal transmission module and the motion module respectively via the seven voltage amplification followers; receive three-dimensional electric field distribution data from the voltage signal acquisition module and transmit the data to the CPU for processing through the input / output devices; wherein, the first to third voltage amplification followers are respectively connected to the first to third stepper motor drivers to control the rotational speed of the three stepper motors; the fourth voltage amplification follower is simultaneously connected to the three stepper motor drivers to synchronously control the rotational direction of the three stepper motors; and the fifth to seventh voltage amplification followers are respectively connected to the first to third relays to control the output of electrical stimulation signals from the three sets of transmitting electrodes.

[0100] In the aforementioned measuring device, the fixing holes on the fixed frame and the fixing holes on the base plate are evenly distributed, and the central processing unit is a computer.

[0101] Beneficial effects

[0102] Compared with known public technologies, the technical solution provided by this invention has the following beneficial effects:

[0103] This invention provides a three-dimensional electric field distribution measurement device for phase interference electric fields, which integrates stimulation signal output, a rapidly and accurately movable structure, a stable fixed structure, and voltage signal acquisition. It can arbitrarily change the stimulation signal, uses only a pair of test electrodes, and quickly adjusts the spatial position of the test electrodes and the transmitting electrodes. It can conveniently control the output mode of two independent AC signals above kilohertz to the transmitting electrodes. At the same time, it is stable, easy to operate, and easy to observe, which is beneficial to the research of phase interference electric field theory. In particular, this invention innovatively uses three sets of transmitting electrodes to output electrical signals alternately in sequence, which is equivalent to the transmitting electrodes rotating in three-dimensional space. Only one pair of test electrodes is needed to measure the electric field intensity in three directions of the vector field, achieving the purpose of conveniently measuring the three-dimensional electric field distribution of the phase interference electric field. By setting up multiple independent voltage amplifier followers and relays, multiple sets of transmitting electrodes can be conveniently controlled, allowing the transmitting electrodes on several planes to be arbitrarily connected, thereby achieving the purpose of sequentially rotating and outputting electrical stimulation signals, which is equivalent to rotating the transmitting electrodes. By setting up multiple independent voltage amplifier followers, stepper motor drivers, and stepper motors, the slide table in the XYZ three-axis direction can be conveniently controlled to move precisely, allowing the test electrodes fixed to the slide table to move arbitrarily, thereby changing the spatial position of the test electrodes and measuring the electric field distribution at any point in the three-dimensional electric field more quickly and efficiently. The top plate, various support plates and connecting rods, fixing rods, bottom plates and fixing clamps in the fixing module can be assembled and used to fix multiple sets of transmitting electrodes and conveniently adjust the spatial position of the transmitting electrodes. Attached Figure Description

[0104] Figure 1 This indicates the positions of the four transmitting electrodes S1, S2, S3, S4 and the two test electrodes T1, T2 in the OXYZ coordinate system.

[0105] Figure 2 This indicates that the OXYZ coordinate system is rotated around the X-axis to obtain a new coordinate system O′X′Y′Z′. Figure 2 A represents a new coordinate system O′X′Y′Z′, which is a π / 2 rotation of the OXYZ coordinate system around the X-axis. The transmitting electrodes S1, S2, S3, and S4 rotate with the OXYZ coordinate system, while the testing electrodes T1 and T2 do not rotate with the OXYZ coordinate system. Figure 2 B indicates that the new coordinate system O′X′Y′Z′ rotates around the X-axis by -π / 2 to return to the OXYZ coordinate system. The transmitting electrodes S′1, S′2, S′3, S′4 and the test electrodes T′1, T′2 in the O′X′Y′Z′ coordinate system rotate together with the coordinate system.

[0106] Figure 3 This indicates that the OXYZ coordinate system is rotated around the Z-axis to obtain a new coordinate system O″X″Y″Z″. Figure 3A represents a new coordinate system O″X″Y″Z″, which is a π / 2 rotation of the OXYZ coordinate system around the Z-axis. The transmitting electrodes S1, S2, S3, and S4 rotate with the OXYZ coordinate system, while the testing electrodes T1 and T2 do not rotate with the OXYZ coordinate system. Figure 3 B indicates that the new coordinate system O″X″Y″Z″ rotates around the Z-axis by -π / 2 to return to the OXYZ coordinate system. The emitting electrodes S″1, S″2, S″3, S″4 and the test electrodes T″1, T″2 in the O″X″Y″Z″ coordinate system rotate together with the coordinate system.

[0107] Figure 4 This is a schematic diagram of the connection of the device provided by the present invention. The fourth voltage amplifier follower 6 is connected to the first stepper motor driver 22, the second stepper motor driver 23, and the third stepper motor driver 24; the first signal amplifier 11 outputs one signal to the first relay 13, the second relay 14, and the third relay 15 respectively, and the second signal amplifier 12 outputs another signal to the first relay 13, the second relay 14, and the third relay 15 respectively; the remaining structures are all connected one-to-one.

[0108] Figure 5This diagram illustrates the connection of the control signal output in this invention, including a computer 1, a USB-6361 multi-function I / O device 2, a first voltage amplifier follower 3, a second voltage amplifier follower 4, a third voltage amplifier follower 5, a fourth voltage amplifier follower 6, a fifth voltage amplifier follower 7, a sixth voltage amplifier follower 8, and a seventh voltage amplifier follower 9, a first stepper motor driver 22, a second stepper motor driver 23, and a third stepper motor driver 24, a first stepper motor 25, a second stepper motor 26, and a third stepper motor 27, and a first relay 13, a second relay 14, and a third relay 15. The 24V+ and 0V ports of the seven voltage amplifier followers 3, 4, 5, 6, 7, 8, and 9, the +V and GND ports of the three stepper motor drivers 22, 23, and 24, and the VCC and GND ports of the three relays 13, 14, and 15 are all connected to the positive and negative terminals of the power supply, respectively. The specific connections between other devices are as follows: the digital output ports PO.0, PO.1, PO.2, PO.3, PO.4, PO.5, and PO.6 of the USB-6361 multi-function I / O device 2 are connected to the VIN+ ports of the seven voltage amplifier followers 3, 4, 5, 6, 7, 8, and 9, respectively; the D GND port of the USB-6361 multi-function I / O device 2 is synchronously connected to the VIN- ports of the seven voltage amplifier followers 3, 4, 5, 6, 7, 8, and 9; the VOUT+ ports of the three voltage amplifier followers 3, 4, and 5 are connected to the PUL+ ports of the three stepper motor drivers 22, 23, and 24, respectively; the VOUT+ port of voltage amplifier follower 7 is synchronously connected to the DIR+ ports of the three stepper motor drivers 22, 23, and 24; the VOUT+ ports of the three voltage amplifier followers 7, 8, and 9 are connected to the X1 ports of the three relays 13, 14, and 15, respectively; the three stepper motor drivers... The PUL- ports of devices 22, 23, and 24 are interconnected and connected to the S / S port of relay 13. The DIR- ports of the three stepper motor drivers 22, 23, and 24 are interconnected and connected to the S / S port of relay 15. The A+, A-, B+, and B- ports of the three stepper motor drivers 22, 23, and 24 are connected to the corresponding ports of stepper motors 25, 26, and 27, respectively. The S / S ports of the three relays 13, 14, and 15 are interconnected, and the X1, X2, X3, and X4 ports of the three relays 13, 14, and 15 are connected in pairs.

[0109] Figure 6 The diagram shows the connection of the electrical stimulation signal output in this invention, including a signal generator 10, a first signal amplifier 11, a second signal amplifier 12, a first relay 13, a second relay 14, a third relay 15, a first set of transmitting electrodes (OXY plane) 16, a second set of transmitting electrodes (OYZ plane) 17, and a third set of transmitting electrodes (OXZ plane) 18.

[0110] Figure 7 This is a schematic diagram showing the planar and spatial positions of the three sets of emitting electrodes 16, 17, and 18 in this invention. Figure 7 AC represents the planar positions of the first group of emitting electrodes (OXY plane) 16, the second group of emitting electrodes (OYZ plane) 17, and the third group of emitting electrodes (OXZ plane) 18, respectively. Figure 7 D represents a schematic diagram of the spatial positions of the three sets of emitting electrodes.

[0111] Figure 8 This is a schematic diagram of the voltage signal acquisition connection in this invention, including a test electrode 19, a test electrode fixing bracket 20, a third signal amplifier 21, a computer 1, and a USB-6361 multi-function I / O device 2.

[0112] Figure 9 This is a schematic diagram of the assembly of the test electrode 19 and the test electrode fixing bracket 20 in this invention. Figure 9 A and B respectively represent two available structures for test electrode 19. Figure 9 A is a coaxial structure, with the outer insulating medium of the coaxial line arranged sequentially from the outside to the inside. Figure 9 A. The outermost blank part), outer conductor ( Figure 9 A. The oblique section near the outer insulating medium), the inner insulating medium ( Figure 9 The blank part inside the outer conductor (A) and the inner conductor ( Figure 9 (the diagonal part of the center of A), Figure 9 B represents the enameled wire structure. Figure 9 CD represent the top view and three-dimensional schematic diagram of the combined structure, respectively.

[0113] Figure 10 This is an assembly diagram of the first stepper motor 25, the second stepper motor 26, the third stepper motor 27, the first slide 28, the second slide 29, and the third slide 30 in this invention.

[0114] Figure 11 This is a three-dimensional schematic diagram of the fixing frame 31 in this invention.

[0115] Figure 12 This is a three-dimensional schematic diagram of the fixing rod 32 in this invention.

[0116] Figure 13 This is a three-dimensional schematic diagram of the fixing clip 33 in this invention.

[0117] Figure 14 This is a three-dimensional schematic diagram of the base plate 34 in this invention.

[0118] Figure 15This is an assembly diagram of the fixing frame 31, fixing rod 32 and base plate 34 in this invention. The fixing frame 31 and base plate 34 are connected by multiple fixing rods 32.

[0119] Figure 16 This is a schematic diagram of the combination of three sets of emitting electrodes 16, 17, and 18 with fixing rods 32 and fixing clips 33 in this invention. Taking one emitting electrode in the first set of emitting electrodes 16 as an example, the specific assembly method of the emitting electrode and fixing rods 32 and fixing clips 33 is demonstrated. In actual application, the three sets of emitting electrodes 16, 17, and 18 are simultaneously assembled on multiple fixing rods 32 and multiple fixing clips 33 are used. Figure 16 A and B respectively represent three-dimensional schematic diagrams of the combined structure from two perspectives.

[0120] Figure 17This is a main assembly diagram and positional schematic diagram of the device for measuring the three-dimensional electric field distribution of phase interference electric field according to the present invention. It shows the assembly and positional relationship between the following structures: the first group of emitting electrodes 16, the second group of emitting electrodes 17, the third group of emitting electrodes 18, the test electrode 19, the fixed bracket 20 for the test electrode, the first stepper motor 25, the second stepper motor 26, the third stepper motor 27, the first slide 28, the second slide 29, the third slide 30, the fixed frame 31, the fixed rod 32, the fixed clamp 33, the base plate 34, the optical plate 35, the lifting platform 36, and the cylindrical container 37. Specifically, the assembly is as follows: several optical plates 35 of different sizes are fixed as a whole and placed on the worktable. A larger rectangular optical plate 35 serves as the main body, and two smaller rectangular optical plates 35 are fixed on both sides of the larger rectangular optical plate 35 as extension arms; another square optical plate 35 is placed on a lower worktable. Three stepper motors 25, 26, and 27 are fixed on the corresponding three slides 28, 29, and 30 and mounted on the larger rectangular optical plate 35. The test electrode 19 and the test electrode mounting bracket 20 are fixed as a whole and mounted on the slider of the third slide 30. The cylindrical container 37 and the lifting platform 36 form a liftable test container, and the lifting platform 36 is fixed on the square optical plate 35. The fixing frame 31, fixing rod 32, and base plate 34 are fixed as a whole and placed on the extension arm of the optical plate 35. The three sets of emitting electrodes 16, 17, and 18 are placed in the small holes on the vertical rods of the multiple fixing rods 32 and fixed with multiple fixing clips 33. In practical applications: By controlling the movement of the three sliding stages 28, 29, and 30, the spatial position of the test electrode 19 can be arbitrarily changed. The three sets of emitting electrodes 16, 17, and 18 can be placed in different holes on the multiple fixed rods 32, allowing for arbitrary changes in their spatial positions. Then, by adjusting the handwheel of the lifting platform 36, the cylindrical container 37 filled with liquid conductive medium is positioned at a suitable height. The three sets of emitting electrodes 16, 17, and 18, along with the test electrode 19, are completely immersed in the liquid conductive medium inside the cylindrical container 37, forming a phase interference electric field inside the container and measuring the three-dimensional electric field distribution. The three sets of emitting electrodes 16, 17, and 18 are connected to an electrical signal transmission module, and the test electrode 19 is connected to a voltage signal acquisition module.

[0121] Figure 18 This is a diagram showing the results of measuring the three-dimensional electric field distribution of the phase interference electric field according to the present invention. Figure 18 AC represents the peak-to-valley difference (V) of the electric field in the X direction at each test point on the three planes OYZ, OXZ, and OXY, respectively. The test parameters are: the spatial range of the transmitting electrode is 80×80×80mm, the scanning range of the test electrode is 60×60×60mm, the test points are spaced 5mm apart, for a total of 13×13×13 test points, the two-channel output current amplitude is 20V, and the amplification factor is 100x. The test results of this invention are demonstrated using 13×13 test points on the three planes OYZ, OXZ, and OXY as an example.

[0122] Explanation of the labels in the diagram:

[0123] 1. Computer; 2. USB-6361 multi-function I / O device; 3. First voltage amplifier follower; 4. Second voltage amplifier follower; 5. Third voltage amplifier follower; 6. Fourth voltage amplifier follower; 7. Fifth voltage amplifier follower; 8. Sixth voltage amplifier follower; 9. Seventh voltage amplifier follower; 10. Signal generator; 11. First signal amplifier; 12. Second signal amplifier; 13. First relay; 14. Second relay; 15. Third relay; 16. First set of transmitting electrodes (OXY plane); 17. Second set of transmitting electrodes (OYZ plane); 18. 19. Test electrode; 20. Test electrode mounting bracket; 21. Third signal amplifier; 22. First stepper motor driver; 23. Second stepper motor driver; 24. Third stepper motor driver; 25. First stepper motor; 26. Second stepper motor; 27. Third stepper motor; 28. First slide (X-axis direction); 29. ​​Second slide (Y-axis direction); 30. Third slide (Z-axis direction); 31. Fixing frame; 32. Fixing rod; 33. Fixing clamp; 34. Base plate; 35. Optical plate; 36. Lifting platform; 37. Cylindrical container. Detailed Implementation

[0124] The structure of this invention mainly consists of five parts, and the main components of each part are as follows.

[0125] (I) Control Module.

[0126] 1. Computer: In this embodiment of the invention, a microcomputer is used as a microcontroller. Control code is written in the MATLAB software and output to the USB-6361 multi-function input / output (I / O) device. Then, through multiple independent voltage amplifiers and followers, the relays are controlled to switch on and off to achieve program control. The three-dimensional electric field distribution data of the phase interference electric field obtained by measurement are received and the data is analyzed and processed in the computer.

[0127] 2. USB-6361 Multifunction I / O Device: Manufactured by National Instruments, the USB-6361 multifunction I / O device comes with a matching USB cable and connects to a computer via a USB interface. The USB-6361 provides analog and digital I / O, with 16 AI channels, 2 AO channels, and 24 DIO channels. During control signal output, the digital control signals generated in the microcontroller are transmitted to the voltage amplifier follower via the DIO interface of the USB-6361. During voltage signal input to the microcontroller, the voltage signal recorded by the third signal amplifier in the voltage signal acquisition module is received via the AI ​​interface of the USB-6361 multifunction I / O device, and the analog signal is converted to a digital signal before being input to the microcontroller.

[0128] 3. The first voltage amplifier follower: A high-precision voltage amplifier follower manufactured by Guantuo Electronics Technology Co., Ltd., operating at 24V, which can increase the output power of the input voltage and the output drive current can reach 100mA. The voltage amplifier follower has a row of connectors on both sides. The left side connects to the DIO and D GND ports of the USB-6361 multi-function I / O device, improving the load-driving capacity of the USB-6361 multi-function I / O device. The right side connects to the power supply positive and negative terminals and specific electrical components. The right side connector of the first voltage amplifier follower is connected to the stepping pulse signal connector of the first stepper motor driver via a connecting cable, thereby controlling the speed of the first stepper motor.

[0129] 4. Second voltage amplifier follower: The right-side connector of the second voltage amplifier follower is connected to the step pulse signal connector of the second stepper motor driver via a connecting wire, thereby controlling the speed of the second stepper motor; the rest of the structure of the second voltage amplifier follower is the same as that of the first voltage amplifier follower.

[0130] 5. Third voltage amplifier follower: The right-side connector of the third voltage amplifier follower is connected to the step pulse signal connector of the third stepper motor driver via a connecting wire, thereby controlling the speed of the third stepper motor; the rest of the structure of the third voltage amplifier follower is the same as that of the first voltage amplifier follower.

[0131] 6. Fourth voltage amplifier follower: The right-side connector of the fourth voltage amplifier follower is connected to the direction control signal connector of the three stepper motor drivers simultaneously, thereby controlling the forward and reverse rotation of the three stepper motors; the rest of the structure of the fourth voltage amplifier follower is the same as that of the first voltage amplifier follower.

[0132] 7. Fifth voltage amplifier follower: The right side of the fifth voltage amplifier follower is connected to the first relay, which controls the opening and closing of the first relay, thereby controlling the signal output of the first set of transmitting electrodes; the rest of the structure of the fifth voltage amplifier follower is the same as that of the first voltage amplifier follower.

[0133] 8. Sixth voltage amplifier follower: The right side of the sixth voltage amplifier follower is connected to the second relay, which controls the opening and closing of the second relay, thereby controlling the signal output of the second set of transmitting electrodes; the rest of the structure of the sixth voltage amplifier follower is the same as the first voltage amplifier follower.

[0134] 9. Seventh voltage amplifier follower: The right side of the seventh voltage amplifier follower is connected to the third relay, which controls the opening and closing of the third relay, thereby controlling the signal output of the third set of transmitting electrodes; the rest of the structure of the seventh voltage amplifier follower is the same as that of the first voltage amplifier follower.

[0135] (ii) Electrical signal transmission module.

[0136] 10. Signal Generator: FeelTech FY2300-12M dual-channel function / arbitrary waveform generator, covering a variety of commonly used waveforms, with a frequency range up to 10MHz, a phase adjustment range of 0~359°, and an output amplitude of 5mV. PP ~20V PP The parameters can be adjusted via the built-in buttons, and the display interface can simultaneously show the output parameters of two channels, generating and outputting the required electrical stimulation signal. There is a row of connectors on both the left and right sides of the signal generator; the left side connects to the power supply, and the two output ports on the right side connect to two signal amplifiers respectively.

[0137] 11. First signal amplifier: FeelTech FPA2000-50W dual-channel isolated signal amplifier, with a maximum output amplitude of 140V. PP It offers selectable 2x or 10x gain, input impedance ≥10KΩ, output impedance <2Ω, and features a power connector, adjustment switch, input port, and output port on the bottom. In dual-channel output mode, each channel can achieve a maximum output power of 50W and a maximum output amplitude of 65V. PP The maximum output current is 2A; in single-channel output mode, the maximum output power can reach 60W. The signal amplifier amplifies the electrical stimulation signal output by the signal generator and then inputs it to multiple corresponding relays. The first input port of the first signal amplifier is connected to the first output port of the signal generator; the first and second output ports of the first signal amplifier are connected to the channel one and channel two input ports of the first, second, and third relays, respectively.

[0138] 12. Second signal amplifier: The first input port of the second signal amplifier is connected to the second output port of the signal generator; the first and second output ports of the second signal amplifier are connected to the input ports of channel three and channel four of the first, second, and third relays, respectively. The remaining structure of the second signal amplifier is the same as that of the first signal amplifier.

[0139] 13. The first relay: A ZS-DO-R-10A-1NOC-4 electromagnetic relay manufactured by ZhongSheng Technology Co., Ltd., with four outputs, a trigger voltage of 3-9V, a coil voltage of 24V, a contact load of 10A, and a contact configuration of one open and one closed. It has a row of terminals on both sides. The four output ports are connected to multiple sets of transmitting electrodes, and the four input ports are connected to the output ports of two signal amplifiers, and then to corresponding voltage amplification followers. The output port of the first relay is connected to the first set of transmitting electrodes, and the input ports are connected to the two signal amplifiers, and then to a fifth voltage amplification follower, thereby controlling the signal output of the first set of transmitting electrodes.

[0140] 14. Second Relay: The output port of the second relay is connected to the second set of transmitting electrodes, and the input port is connected to two signal amplifiers and a sixth voltage amplifier follower, thereby controlling the signal output of the second set of transmitting electrodes; the rest of the structure of the second relay is the same as that of the first relay.

[0141] 15. Third relay: The output port of the third relay is connected to the third set of transmitting electrodes, the input port is connected to two signal amplifiers, and a seventh voltage amplifier follower is connected to control the signal output of the third set of transmitting electrodes; the rest of the structure of the third relay is the same as the first relay.

[0142] 16. First set of emitting electrodes: Located in the OXY plane, these are four spherical electrodes made of metal, each 5mm in diameter, equivalent to a point electrode. The surface of the metal spheres is directly welded to a rigid metal rod, and then wires are welded to the metal rod. The surfaces of the metal rod and wires are insulated and waterproofed to prevent leakage when in a liquid conductive medium. Each set of emitting electrodes has four spherical electrodes. The metal rod and wires connected to the spherical electrodes pass through small holes of a certain thickness on the fixing rod, ensuring that each spherical electrode is placed precisely at the outer edge of the hole on the fixing rod. The four spherical electrodes are equidistant and symmetrically placed. The wires of the four spherical electrodes exit through small holes on the surface of the top plate and are connected sequentially to the four output ports of the corresponding relays. All four spherical electrodes in the first set of emitting electrodes are located in the OXY plane, and their wires are sequentially connected to the four output ports of the first relay.

[0143] 17. Second set of transmitting electrodes: Located in the OYZ plane, the four ball electrodes in the second set of transmitting electrodes are all located in the OYZ plane, and their wires are connected sequentially to the four output ports of the second relay. The remaining structure of the second set of transmitting electrodes is the same as that of the first set of transmitting electrodes.

[0144] 18. Third group of transmitting electrodes: Located in the OXZ plane, the four ball electrodes in the third group of transmitting electrodes are all located in the OXZ plane, and their wires are connected sequentially to the four output ports of the third relay. The remaining structure of the third group of transmitting electrodes is the same as that of the first group of transmitting electrodes.

[0145] (III) Voltage signal acquisition module.

[0146] 19. Test Electrode: A pair of dipole electrodes, vertically suspended above the hollowed-out area of ​​the top plate of the fixed frame. The test electrode of this invention can be a coaxial cable or enameled wire. If a coaxial cable is used, the exposed end of the inner conductor forms one electrode, and the annular exposed end of the outer conductor serves as the other electrode, together forming a pair of test electrodes; if enameled wire is used, the surface is uniformly covered with an insulating and waterproof coating, with only the two bottom ends exposed for conductivity, forming a pair of horizontally distributed test electrodes. The distance between the two test electrodes is 3-5 mm, and a wire is welded to the other end of the test electrode, which is connected to the input terminal of a third signal amplifier.

[0147] 20. Test electrode mounting bracket: Made of insulating, waterproof, and high-rigidity material with a certain thickness, it includes a fixed plane and an extension arm at a 90° angle. Several fixing holes are evenly distributed on the fixed plane, which match the threaded fixing holes on the slider of the third slide (Z-axis direction) for mechanical connection between the two. The end of the extension arm opens from the outside to the inside, with several through holes evenly distributed on the left and right sides. The test electrode can be placed at the opening, and screws are passed through the small holes on the left and right sides and tightened with nuts to clamp the opening, thereby vertically fixing the test electrode. Several U-shaped wire clamps are installed on the upper surface of the extension arm to fix the wires of the test electrode.

[0148] 21. The third signal amplifier: a BMA-400 amplifier manufactured by CWE, Inc. of the United States. Its input terminal is connected to the wires of the test electrode, and the corresponding output terminal is connected to the A / D input terminal of the USB-6361 multi-function I / O device. After amplifying the voltage signals in the three directions of XYZ axis at any point in space recorded by the test electrode, the analog signals are converted into digital signals by the A / D converter of the USB-6361 multi-function I / O device and then input into the computer.

[0149] (iv) Mobile module.

[0150] 22. The first stepper motor driver: a DM542S driver manufactured by Pratt & Whitney, compatible with the 57HSS22-8 stepper motor. It has a row of connection holes on its bottom, which connect to the power supply, the stepper motor, and two voltage amplifier followers, respectively, allowing the power supply to power the driver and control the speed and direction of the stepper motor's rotation. The first stepper motor driver is connected to the first stepper motor, the first voltage amplifier follower, and the fourth voltage amplifier follower.

[0151] 23. Second stepper motor driver: The second stepper motor driver is connected to the second stepper motor, the second voltage amplifier follower, and the fourth voltage amplifier follower. The rest of the structure of the second stepper motor driver is the same as that of the first stepper motor driver.

[0152] 24. Third Stepper Motor Driver: The third stepper motor driver is connected to the third stepper motor, the third voltage amplifier follower, and the fourth voltage amplifier follower. The remaining structure of the third stepper motor driver is the same as that of the first stepper motor driver.

[0153] 25. First Stepper Motor: A 57HSS22-8 stepper motor manufactured by Professor, with a maximum speed of 1000 rpm, holding torque of 2.3 Nm, step angle of 1.8°, operating voltage of 24–36 V, rated current of 3 A, and horizontal load capacity of 10 kg. The stepper motor comes with its own connecting cable and can be connected to a DM542S driver. The stepper motor is mounted on the motor flange of the slide module using screws. The stepper motor and the slide module are connected via a coupling, thereby controlling the linear motion of the ball screw in the slide module, causing the slider to move. The first stepper motor is connected to the first stepper motor driver and mounted on the first slide (X-axis direction).

[0154] 26. Second Stepper Motor: The second stepper motor is connected to the second stepper motor driver and mounted on the second slide (Y-axis direction). The rest of the structure of the second stepper motor is the same as that of the first stepper motor.

[0155] 27. Third Stepper Motor: The third stepper motor is connected to a third stepper motor driver and is mounted on the third slide (Z-axis direction). The rest of the structure of the third stepper motor is the same as that of the first stepper motor.

[0156] 28. First slide (X-axis direction): Model KR60, composed of a coupling, slider, linear guide, and ball screw, driven by the ball screw, with a stroke of 300mm and a horizontal load capacity of 50KG. The motor flange of the slide has multiple threaded mounting holes for fixing a stepper motor with screws. The bottom of the slide and the slider have varying numbers of threaded mounting holes. The first slide is placed in the X-axis direction, and its bottom is screwed onto the optical plate. Its slider is tightly connected to the bottom of the second slide with screws, placing the second slide in the Y-axis direction.

[0157] 29. Second slide (Y-axis direction): The second slide is placed in the Y-axis direction, and its bottom is connected to the slider of the first slide. Its slider is tightly connected to the bottom of the third slide with screws, so that the third slide is placed in the Z-axis direction.

[0158] 30. Third slide (Z-axis direction): The third slide is placed in the Z-axis direction, and its bottom is connected to the slider of the second slide. The slider is tightly connected to the fixing bracket of the test electrode with screws. The three slides (X, Y, and Z-axis directions) constitute a linear electric slide module, which allows the fixing bracket of the test electrode to move arbitrarily along the X, Y, and Z axes, thereby allowing the test electrode to move arbitrarily in space.

[0159] (v) Fixed module.

[0160] The module includes a fixed frame, a fixed rod, a fixed clamp, a base plate, an optical plate, a lifting platform, and a cylindrical container, and realizes the following main functions: (1) Fixing multiple sets of emitting electrodes: The fixed frame, fixed rod, fixed clamp, and base plate form a support and are used together. They are completely immersed in the cylindrical container to provide fixed positions for multiple sets of emitting electrodes, and multiple sets of emitting electrodes can be fixed. The holes on the vertical rod of the fixed rod are evenly spaced, which can easily adjust the position of the emitting electrodes and the distance between the emitting electrodes; (2) Forming a base: Several optical plates of different specifications form a base and are placed stably on a higher worktable. Three sliding table modules are combined and installed on a larger rectangular optical plate. The lifting platform and the cylindrical container are placed on a lower square optical plate; (3) Forming a liftable test container: The cylindrical container is vertically fixed on the worktable of the lifting platform. The two form a whole. By adjusting the handwheel of the lifting platform, the vertical height of the cylindrical container can be changed. The lifting platform is placed on another lower worktable. The fixing frame, fixing rod, fixing clamp, base plate, and cylindrical container inside the fixed module are all made of insulating, waterproof, and highly rigid materials. All structures immersed in the liquid conductive medium inside the cylindrical container are connected with plastic screws.

[0161] 31. Fixing Frame: A frame-shaped integrated structure consisting of a top plate and a support plate, with high rigidity and strength; the top plate is a square plate of a certain thickness, with a hollowed-out central area, around which several fixing holes are evenly distributed. The diameter and spacing of these holes are adapted to the fixing holes on the cuboid strips at both ends of the fixing rod, and allow the wires of the transmitting electrode to pass through; the four corners of the top plate are supported by vertical support plates of a certain thickness, and the entire fixing frame is placed vertically and stably on the optical plate.

[0162] 32. Fixing rod: Composed of cuboid blocks at both ends and a vertical rod in the middle, with a certain thickness; each cuboid block at both ends of the fixing rod has two symmetrically distributed fixing holes. These small holes are vertical, and their diameter and spacing are adapted to the fixing holes on the top and bottom plates of the fixing frame; the fixing rod is connected to the fixing frame and the bottom plate through the fixing holes, and the fixing rod is vertically fixed between the top and bottom plates of the fixing frame; several small holes are evenly distributed on the vertical rod in the middle of the fixing rod. The spacing between each small hole is equal, and the hole diameter is similar to the diameter of the metal rod of the emitting electrode, so that the metal rod can pass through the small holes and remain stable, thereby fixing the emitting electrode inside the test container.

[0163] 33. Fixing clamp: A rectangular block with a certain thickness, with a small through hole on the left and right sides, and an opening from top to bottom at the center line of the upper side. The middle section of the opening is cylindrical and hollow, with a diameter similar to that of the metal rod of the emitting electrode, so that the metal rod can pass through the cylindrical hollow. Then, screws are passed through the small holes on the left and right sides and tightened to clamp the emitting electrode.

[0164] 34. Base plate: An octagonal plate with a certain thickness, high rigidity and strength, with several fixing holes evenly distributed around its central area. The diameter and spacing of these holes are adapted to the fixing holes on the cuboid blocks at both ends of the fixing rod.

[0165] 35. Optical plate: It has a certain thickness, high rigidity and strength, and is not easily deformed; the optical plate has several threaded fixing holes, the diameter and spacing of which match the threaded mounting holes on the slider of the first slide (X-axis direction), allowing for mechanical connection between the two; the four corners of the optical plate are supported by pads of a certain height. This invention uses several optical plates of different sizes, which can be fixed together with screws to form a whole.

[0166] 36. Lifting platform: Includes handwheel, high-precision ruler and worktable. The vertical height of the lifting platform can be precisely changed by manually adjusting the handwheel by referring to the high-precision ruler. The worktable has evenly distributed threaded fixing holes, and the area of ​​the worktable is similar to the bottom surface of the cylindrical container.

[0167] 37. Cylindrical Container: Made of insulating, high-rigidity material, hollow inside, without a lid, with a certain thickness on both the surface and bottom, and a diameter smaller than the side length of the top plate of the fixed frame. The bottom surface of the cylindrical container has evenly distributed fixing holes that match the size of the fixing holes on the working surface of the lifting platform, allowing the cylindrical container to be fixed to the platform. Together, they form a liftable test container. The vertical height of the cylindrical container can be easily changed by adjusting the handwheel of the lifting platform. During measurement, a liquid conductive medium is placed inside the cylindrical container.

[0168] To achieve the above objectives, the present invention provides the following technical solution:

[0169] This invention provides a measuring device for the three-dimensional electric field distribution of a phase interference electric field, comprising a control module, an electrical signal transmission module, a voltage signal acquisition module, a moving module, and a fixing module.

[0170] The control module is used to output control signals and analyze and process voltage signals. During the output of control signals, the control module outputs the control program written in the computer to the input / output (I / O) device, and then transmits the control signals to the electrical signal transmission module and the motion module through multiple independent voltage amplifier followers. During the analysis and processing of voltage signals, the control module receives the three-dimensional electric field distribution data of the phase interference electric field measured by the voltage signal acquisition module, and transmits it to the computer through the input / output (I / O) device for data analysis and processing.

[0171] The electrical signal transmission module is used to output electrical stimulation signals. During the process of outputting electrical stimulation signals, the electrical signal transmission module outputs electrical stimulation signals from the signal generator. It is equipped with two circuits to output electrical stimulation signals. By setting up multiple independent relays, it accepts the control program of the control module and quickly changes the output mode of the two circuits, that is, it controls the output of electrical stimulation signals from the transmitting electrodes on different planes, so that the transmitting electrode on a certain plane is connected, thereby achieving the purpose of rotating the transmitting electrode.

[0172] The voltage signal acquisition module is used to acquire the voltage signals of two points in space along the XYZ directions of the phase interference electric field at any point in space. Acquiring the voltage signals of two points in space along the X direction of any point actually means acquiring the voltage between two points at very small distances on either side of that point in the X direction. Dividing the voltage between the two points by the distance between them yields the electric field strength at the midpoint. The same principle is used to acquire the voltage signals of two points in space along the Y and Z directions, thereby measuring the three-dimensional electric field distribution of the phase interference electric field. The voltage signal acquisition module transmits the acquired voltage signal data to the control module, which converts the analog voltage signal into a digital voltage signal and then inputs it to the microcontroller.

[0173] The moving module is used to automatically and precisely move the test electrode. By setting up multiple independent stepper motor drivers and receiving the control program of the control module, the rotation speed and direction of the stepper motors can be conveniently controlled, driving the slide table in the XYZ three-axis direction to move precisely, thereby allowing the test electrode fixed on the slide table to move arbitrarily and change the spatial position of the test electrode.

[0174] The fixing module is used to form a stable support structure, fixing multiple sets of emitting electrodes (stimulation electrodes) in space, and the spatial position of the emitting electrodes can be changed arbitrarily; the fixing module provides a liftable test container, which is used to fill a liquid conductive medium and then output two AC signals above kilohertz through the stimulation electrodes, forming a phase interference electric field by superimposing them in the liquid conductive medium inside the container; the base structure in the fixing module is used to provide fixing points for some structures in this invention.

[0175] The electrical signal transmission module, voltage signal acquisition module, and motion module are respectively connected to the control module;

[0176] The aforementioned control module includes a computer, I / O devices, and multiple voltage amplifier followers, wherein:

[0177] The computer acts as a microcontroller and is connected to I / O devices. When outputting control signals, control code is written in the computer, output to the I / O devices, and then the program control circuit is realized through multiple independent voltage amplifiers and followers. The computer receives the voltage digital signals transmitted by the I / O devices, processes and analyzes the three-dimensional electric field distribution data of the phase interference electric field.

[0178] The I / O devices are connected to the microcontroller, multiple voltage amplifier followers, and a signal amplifier, respectively. The I / O devices are connected to the microcontroller via a USB interface, to the voltage amplifier followers via a DIO interface, and to the signal amplifier via an AI interface. When outputting control signals, the I / O devices transmit the digital control signals generated in the microcontroller to the voltage amplifier followers. When measuring the three-dimensional electric field distribution of the phase interference electric field, the A / D converter in the I / O devices converts the analog signals recorded by the signal amplifier in the voltage signal acquisition module into digital signals, and then transmits the voltage signals to the microcontroller through the input interface.

[0179] The voltage amplifier follower is used to improve the load-carrying capacity of the I / O device. There are seven voltage amplifier followers in total. The input terminals of the multiple voltage amplifier followers are sequentially connected to multiple DIO interfaces of the I / O device, and the output terminals of the voltage amplifier followers are connected to specific electrical components. The output terminals of the first, second, and third voltage amplifier followers are connected to corresponding stepper motor drivers, controlling the speed of the stepper motors respectively. The output terminal of the fourth voltage amplifier follower is simultaneously connected to three stepper motor drivers, controlling the forward and reverse rotation of the three stepper motors. The output terminals of the fifth, sixth, and seventh voltage amplifier followers are connected to corresponding relays, controlling the opening and closing of the relays respectively.

[0180] The aforementioned electrical signal transmission module includes a signal generator, multiple signal amplifiers, multiple relays, and multiple sets of transmitting electrodes, wherein:

[0181] The signal generator is used to output two electrical stimulation signals. The output port of the signal generator is connected to multiple signal amplifiers respectively. The output parameters of the signal generator can be adjusted arbitrarily.

[0182] The input terminal of the signal amplifier is connected to the signal generator to amplify the electrical stimulation signal output by the signal generator. The output terminal of the signal amplifier is connected to multiple relays to input the electrical stimulation signal into the relays. Two signal amplifiers are provided. The first input port of the first signal amplifier is connected to the first output port of the signal generator. The first and second output ports of the first signal amplifier are connected to the input ports of channel one and channel two of the first, second, and third relays, respectively. The first input port of the second signal amplifier is connected to the second output port of the signal generator. The first and second output ports of the second signal amplifier are connected to the input ports of channel three and channel four of the first, second, and third relays, respectively.

[0183] The relay is used to control the signal output of the transmitting electrodes. The input port of the relay is connected to the output ports of two signal amplifiers and a voltage amplifier follower, respectively used to input the electrical stimulation signal and the control program of the control module. The output port of the relay is connected to the transmitting electrodes to output the electrical stimulation signal to them. Three relays are provided in total. The output port of the first relay is connected to the first group of transmitting electrodes, and its input port is connected to two signal amplifiers and a fifth voltage amplifier follower, thereby controlling the signal output of the first group of transmitting electrodes. The output port of the second relay is connected to the second group of transmitting electrodes, and its input port is connected to two signal amplifiers and a sixth voltage amplifier follower, thereby controlling the signal output of the second group of transmitting electrodes. The output port of the third relay is connected to the third group of transmitting electrodes, and its input port is connected to two signal amplifiers and a seventh voltage amplifier follower, thereby controlling the signal output of the third group of transmitting electrodes.

[0184] The transmitting electrodes are used to output electrical stimulation signals. Each transmitting electrode is made of a spherical metal material of appropriate size, and its surface is directly welded to a hard metal rod. Wires are then welded to the metal rod, and the surfaces of the metal rod and wires are insulated and waterproofed. There are three groups of transmitting electrodes, with four electrodes in each group. The first group of transmitting electrodes is located on the OXY plane, and its wires are sequentially connected to the four output ports of the first relay. The second group of transmitting electrodes is located on the OYZ plane, and its wires are sequentially connected to the four output ports of the second relay. The third group of transmitting electrodes is located on the OXZ plane, and its wires are sequentially connected to the four output ports of the third relay. All transmitting electrodes are fixed to corresponding mounting rods.

[0185] The voltage signal acquisition module described above includes test electrodes, a mounting bracket for the test electrodes, and a third signal amplifier, wherein:

[0186] The test electrode is a pair of dipole electrodes; the test electrode can be a coaxial cable or two enameled wires, the distance between the two electrodes of the test electrode is appropriate, and the other end of the test electrode is welded with a wire, which is connected to the input terminal of a third signal amplifier.

[0187] The mounting bracket for the test electrode is made of an insulating, waterproof, and highly rigid material, and includes a fixed plane and an extension arm at a 90° angle. The fixed plane of the mounting bracket has several evenly distributed mounting holes that match the threaded mounting holes on the slider of the third slide, allowing for mechanical connection between the two. The end of the extension arm of the mounting bracket opens from the outside in, with several through holes evenly distributed on both sides, allowing for vertical fixing of the test electrode. The upper surface of the extension arm of the mounting bracket is equipped with several U-shaped wire clamps to fix the test electrode's wires.

[0188] The input terminal of the third signal amplifier is connected to the wire of the test electrode, and the output terminal is connected to the analog-to-digital (A / D) converter of the input / output (I / O) device. The third signal amplifier amplifies the voltage signal recorded by the test electrode and outputs it to the A / D converter to convert the analog signal into a digital signal, which is then input into the computer.

[0189] The aforementioned moving module includes multiple stepper motor drivers, and multiple stepper motors and multiple slides, wherein:

[0190] The stepper motor driver is used to control the rotational speed and direction of the stepper motor. Three stepper motor drivers are provided. The first stepper motor driver is connected to the first stepper motor, the first voltage amplifier follower, and the fourth voltage amplifier follower to control the rotational speed and direction of the first stepper motor. The second stepper motor driver is connected to the second stepper motor, the second voltage amplifier follower, and the fourth voltage amplifier follower to control the rotational speed and direction of the second stepper motor. The third stepper motor driver is connected to the third stepper motor, the third voltage amplifier follower, and the fourth voltage amplifier follower to control the rotational speed and direction of the third stepper motor.

[0191] The stepper motor is used to control the movement of the slider of the slide table; a total of three stepper motors are provided; the first stepper motor is connected to the first stepper motor driver and is installed on the first slide table; the second stepper motor is connected to the second stepper motor driver and is installed on the second slide table; the third stepper motor is connected to the third stepper motor driver and is installed on the third slide table.

[0192] The slides are provided in total, and are combined to form a slide module; the first slide is placed in the X-axis direction, and its bottom is mounted on the optical plate, and its slider is tightly connected to the bottom of the second slide with screws; the second slide is placed in the Y-axis direction, and its bottom is connected to the slider of the first slide, and its slider is tightly connected to the bottom of the third slide with screws; the third slide is placed in the Z-axis direction, and its bottom is connected to the slider of the second slide, and its slider is tightly connected to the fixing bracket of the test electrode with screws.

[0193] The first stepper motor driver is used in conjunction with the first stepper motor and the first slide; the second stepper motor driver is used in conjunction with the second stepper motor and the second slide; the third stepper motor driver is used in conjunction with the third stepper motor and the third slide.

[0194] The stepper motor driver, stepper motor, and slide are provided in three sets, which are used as a whole. The stepper motor driver receives control signals and controls the corresponding stepper motor to rotate, so that the slider of the corresponding slide moves according to the instructions. The fixed bracket of the test electrode fixed to the slide module can move arbitrarily along the XYZ three axes, thereby allowing the test electrode to move arbitrarily in space.

[0195] The aforementioned fixing module includes a fixing frame, fixing rods, fixing clamps, a base plate, an optical plate, a lifting platform, and a cylindrical container, wherein:

[0196] The fixing frame is an integral frame structure, consisting of a top plate and a support plate. The top plate of the fixing frame is a square plate with a certain thickness, with a hollowed-out central area. Several fixing holes are evenly distributed around this area, and the hole diameter and hole spacing are adapted to the fixing holes on the cuboid blocks at both ends of the fixing rod, allowing the wires of the transmitting electrode to pass through. The four corners of the top plate of the fixing frame are supported by vertical support plates of a certain thickness, so that the fixing frame is placed vertically and stably on the optical plate.

[0197] The fixing rod consists of cuboid blocks at both ends and a vertical rod in the middle. Each cuboid block at both ends of the fixing rod has two symmetrically distributed fixing holes, the diameter and spacing of which are adapted to the fixing holes on the top and bottom plates of the fixing frame, for connecting the fixing frame and the bottom plate, so that the fixing rod is vertically fixed between the top and bottom plates of the fixing frame. Several small holes are evenly distributed on the vertical rod in the middle of the fixing rod, the spacing between each small hole is equal, and the diameter of each hole is similar to the diameter of the metal rod of the emitting electrode.

[0198] The fixing clip is a rectangular block with a certain thickness; the left and right sides of the fixing clip have a through hole, and the upper side opens from top to bottom at the center line. The middle section of the opening is cylindrical and hollow, and its diameter is similar to the diameter of the metal rod of the emitting electrode.

[0199] The base plate is an octagonal plate with a certain thickness, and several fixing holes are evenly distributed around its central area. The hole diameter and hole spacing are adapted to the fixing holes on the cuboid strips at both ends of the fixing rod.

[0200] The fixed frame, fixed rod, fixed clamp and base plate are used together to form a support body, which provides fixed positions for multiple sets of emitting electrodes. The metal rod of the emitting electrode is passed through the small hole on the vertical rod of the fixed rod, and then the metal rod is fixed in the cylindrical hollow of the fixed clamp. Screws are passed through the small holes on the left and right sides of the fixed clamp and tightened to clamp and fix the emitting electrode, thereby fixing multiple sets of emitting electrodes.

[0201] The optical plate is covered with evenly distributed threaded fixing holes, which have high rigidity and strength and regular shape. There are four optical plates in total, with different specifications, placed on workbenches of different heights. One of the optical plates is a larger rectangular optical plate as the main body, and two smaller rectangular optical plates are fixed on both sides of the larger rectangular optical plate as extension arms and are placed on a higher workbench. Another square optical plate is placed on a lower workbench.

[0202] The optical plates of different specifications are placed stably on the worktable to form a base. The slide module is assembled on the larger rectangular optical plate, and the lifting platform and cylindrical container are placed on the lower square optical plate.

[0203] The lifting platform includes a handwheel, a high-precision ruler, and a worktable. Fixing holes are evenly distributed on the worktable, and the area of ​​the worktable is similar to the bottom surface of the cylindrical container.

[0204] The cylindrical container has a certain thickness on its surface and bottom, and its diameter is smaller than the side length of the top plate of the fixed frame. The bottom surface has evenly distributed fixing holes, but these holes do not penetrate the bottom surface.

[0205] The cylindrical container contains a liquid conductive medium.

[0206] The size of the fixing hole on the working surface of the lifting platform matches the fixing hole on the bottom surface of the cylindrical container, so that the cylindrical container is vertically fixed on the working surface of the lifting platform. The two form a whole. By adjusting the handwheel of the lifting platform, the spatial position (vertical height) of the cylindrical container can be changed.

[0207] The lifting platform and the cylindrical container constitute a liftable insulation test container;

[0208] The fixed frame, fixed rod, fixed clamp, base plate and cylindrical container are all made of insulating, waterproof and rigid materials. All structures immersed in the liquid conductive medium inside the cylindrical container are connected by plastic screws.

[0209] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0210] In the description of this invention, it should be noted that the terms "upper," "lower," "front," "rear," "inner," "outer," and "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0211] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0212] Example 1: Assembly and demonstration of the measurement device for the three-dimensional electric field distribution of the phase interference electric field of the present invention.

[0213] like Figure 1-17 As shown, the present invention provides a measuring device for the three-dimensional electric field distribution of a phase interference electric field, including a control module, an electrical signal transmission module, a voltage signal acquisition module, a moving module, and a fixing module;

[0214] The control module outputs control signals to the electrical signal transmission module, voltage signal acquisition module, and movement module, and analyzes and processes the measured voltage signals. The three-dimensional electric field distribution of the phase interference electric field is the electric field intensity in the XYZ direction at any point in space. The measurement of the electric field intensity in the X direction at this point is the voltage between two points close to each other along the X direction divided by the distance between the two points. Therefore, the electric field intensity can be calculated from the measured voltage signal.

[0215] The electrical signal transmission module is used to output electrical stimulation signals. The output electrical stimulation signal is generated by a signal generator and has two output circuits. Multiple independent relays are used, receiving control from the control module's program to quickly change the output mode of the two circuits. This controls the output of electrical stimulation signals from the transmitting electrodes on different planes, activating the transmitting electrode on a specific plane to achieve the purpose of rotating the transmitting electrode. The electrical signal transmission module is connected to the control module.

[0216] The voltage signal acquisition module is used to acquire the voltage signal of the phase interference electric field at any point in space in the XYZ direction at that point. The voltage signal acquisition module transmits the acquired voltage signal data to the control module, which converts the voltage analog signal into a voltage digital signal and then inputs it into the microcontroller.

[0217] The moving module is used to automatically and precisely move the test electrode. By setting up multiple independent stepper motor drivers and receiving the control program from the control module, the speed and direction of the stepper motor rotation can be easily controlled, driving the slide table in the XYZ three-axis direction to move precisely, thereby allowing the test electrode fixed to the slide table to move arbitrarily and change the spatial position of the test electrode.

[0218] The fixing module is used to form a stable support structure, fixing multiple sets of emitting electrodes (stimulation electrodes) in space. The spatial position of the emitting electrodes can be changed arbitrarily; it forms a base, providing fixing points for some structures in this invention; it forms a liftable test container, which is used to fill a liquid conductive medium and output two AC signals above kilohertz through the emitting electrodes, which are superimposed in the liquid conductive medium inside the container to form a phase interference electric field.

[0219] In Example 1, the control module includes a computer 1, a USB-6361 multi-function I / O device 2, a first voltage amplifier follower 3, a second voltage amplifier follower 4, a third voltage amplifier follower 5, a fourth voltage amplifier follower 6, a fifth voltage amplifier follower 7, a sixth voltage amplifier follower 8, and a seventh voltage amplifier follower 9, wherein:

[0220] Computer 1 is a microcontroller connected to USB-6361 multi-function I / O device 2: Control code is written in MATLAB software on computer 1 and output to USB-6361 multi-function I / O device 2; The three-dimensional electric field distribution data of the measured phase interference electric field is converted from voltage analog signal to digital signal in USB-6361 multi-function I / O device 2 and then input into the microcontroller for data analysis and processing.

[0221] The power supply provides power to all electrical devices in this invention.

[0222] The USB-6361 multi-function I / O device 2 is connected to the computer 1 via a USB interface. During the output control signal process, multiple digital output ports (DIO ports) of the USB-6361 multi-function I / O device 2 are connected to seven voltage amplifier followers 3, 4, 5, 6, 7, 8, and 9, respectively. Specifically, ports PO.0, PO.1, PO.2, PO.3, PO.4, PO.5, and PO.6 of the USB-6361 multi-function I / O device 2 are connected to the voltage amplifier followers 3, 4, 5, 6, 7, 8, and 9, respectively. IN+ The ports are connected, with the D GND port of the USB-6361 multi-function I / O device 2 connected to the V ports of the seven voltage amplifier followers 3, 4, 5, 6, 7, 8, and 9. IN- The ports are synchronously connected, transmitting the digital control signal generated in microcontroller 1 to the voltage amplifier follower; during the input voltage signal process, the AI ​​interface of USB-636 multi-function I / O device 2 is connected to the third signal amplifier 21 in the voltage signal acquisition module, converting the recorded analog voltage signal into a digital voltage signal and then inputting it into microcontroller 1.

[0223] Seven voltage amplification followers 3, 4, 5, 6, 7, 8, and 9 are used to improve the load-carrying capacity of the USB-6361 multi-function I / O device 2. There is a row of connectors on both the left and right sides. The left side connects to the DIO and D GND ports of the USB-6361 multi-function I / O device 2, and the right side connects to the power supply positive and negative terminals and specific electrical components. A total of seven voltage amplification followers are provided: three voltage amplification followers 3, 4, and 5 are connected to the stepping pulse signal connectors of three stepper motor drivers 22, 23, and 24, respectively; the fourth voltage amplification follower 6 is connected to the direction control signal connectors of three stepper motor drivers 22, 23, and 24 simultaneously; and three voltage amplification followers 7, 8, and 9 are connected to three relays 13, 14, and 15, respectively. By setting up these seven voltage amplification followers, control signals can be transmitted to the electrical signal transmission module and the motion module, thereby controlling the speed and forward / reverse rotation of the three stepper motors 25, 26, and 27, and the signal output of the three sets of transmitting electrodes 16, 17, and 18.

[0224] In Embodiment 1, the electrical signal transmission module includes a signal generator 10, two signal amplifiers 11 and 12, three relays 13, 14 and 15, and three sets of transmitting electrodes 16, 17 and 18, wherein:

[0225] The signal generator 10 is used to generate and output two electrical stimulation signals. The two output ports of the signal generator 10 are connected to two signal amplifiers 11 and 12 respectively, and the electrical stimulation signals are output to the two signal amplifiers 11 and 12.

[0226] Two signal amplifiers, 11 and 12, are used to amplify the electrical stimulation signal. There are two signal amplifiers in total: the input interface of the first signal amplifier 11 is connected to the first output port of the signal generator 10, and the first and second output ports are connected to the input ports of channel one and channel two of the three relays 13, 14, and 15, respectively; the input interface of the second signal amplifier 12 is connected to the second output port of the signal generator 10, and the first and second output ports are connected to the input ports of channel three and channel four of the three relays 13, 14, and 15, respectively. By setting up two signal amplifiers, two independent AC signals above kilohertz can be amplified and output.

[0227] Three relays 13, 14, and 15 are used to control the electrical stimulation signal output of the transmitting electrodes. There are three relays in total: the input ports of all three relays 13, 14, and 15 are connected to two signal amplifiers 11 and 12, and their output ports are connected to three sets of transmitting electrodes 16, 17, and 18, respectively. The first relay 13 is connected to the fifth voltage amplifier follower 7, the second relay 14 is connected to the sixth voltage amplifier follower 8, and the third relay 15 is connected to the seventh voltage amplifier follower 9. By controlling the opening and closing of the relays, the corresponding transmitting electrodes can be made to output or not output electrical stimulation signals. Specifically, each of the three relays 13, 14, and 15 receives two independent AC signals above 1 kilohertz amplified by the two signal amplifiers 11 and 12. Three voltage amplifiers 7, 8, and 9 output control signals to the corresponding relays to control their opening or closing. (1) If the first relay 13 is closed, the other two relays 14 and 15 are open, so that the first set of transmitting electrodes 16 outputs an electrical stimulation signal, and the other two sets of transmitting electrodes 17 and 18 do not output an electrical signal; (2) If the second relay 14 is closed, the other two relays 13 and 15 are open, so that the second set of transmitting electrodes 17 outputs an electrical stimulation signal, and the other two sets of transmitting electrodes 16 and 18 do not output an electrical signal; (3) If the third relay 15 is closed, the other two relays 13 and 14 are open, so that the third set of transmitting electrodes 18 outputs an electrical stimulation signal, and the other two sets of transmitting electrodes 16 and 17 do not output an electrical signal. By setting three relays, the output of electrical stimulation signals by the three sets of transmitting electrodes can be automatically controlled.

[0228] Three sets of emitting electrodes 16, 17, and 18 serve as stimulation electrodes and are connected to three relays 13, 14, and 15, respectively. During the test, they are fixed on the fixing rod 32 and output two AC signals above kilohertz to form a phase interference electric field. There are three sets of emitting electrodes, and each set of emitting electrodes has four ball electrodes: (1) The four ball electrodes in the first set of emitting electrodes 16 are all located on the OXY plane; (2) The four ball electrodes in the second set of emitting electrodes 17 are all located on the OYZ plane; (3) The four ball electrodes in the third set of emitting electrodes 18 are all located on the OXZ plane. By setting three sets of emitting electrodes on different planes, the emitting electrode on a certain plane is connected to output an electrical stimulation signal, thereby achieving the purpose of rotating the emitting electrode.

[0229] In Example 1, the voltage signal acquisition module includes a test electrode 19, a fixing bracket 20 for the test electrode, and a third signal amplifier 21, wherein:

[0230] The test electrode 19 is a pair of dipole electrodes. As a test electrode, only the bottom cross section is conductive. It measures the three-dimensional electric field distribution at the test point and is fixed on the test electrode mounting bracket 20. It is vertically suspended above the hollow area of ​​the top plate of the mounting frame 31. The other end of the test electrode 19 is welded with a wire and connected to the input terminal of the third signal amplifier 21.

[0231] The test electrode fixing bracket 20 is used to fix the test electrode 19. It includes a fixing plane and an extension arm. The fixing plane has several fixing holes for mechanical connection with the slider of the third slide (Z-axis direction) 30. The end of the extension arm opens from the outside to the inside, and several through holes are evenly distributed on the left and right sides. The test electrode 19 can be placed at the opening, and screws are passed through these holes and tightened with nuts to clamp the opening, thereby fixing the test electrode 19 vertically. The upper surface of the extension arm is equipped with several U-shaped wire clamps to fix the wires of the test electrode 19.

[0232] The third signal amplifier 21 amplifies the voltage signal in a certain direction at the measurement point recorded by the test electrode 19, and then converts the analog signal into a digital signal through the A / D converter of the USB-6361 multi-function I / O device 2, before inputting it into the microcontroller 1 for data processing and analysis.

[0233] In embodiment 1, the moving module includes three stepper motor drivers 22, 23, and 24, three stepper motors 25, 26, and 27, and three slides 28, 29, and 30, wherein:

[0234] Three stepper motor drivers 22, 23, and 24 are connected to three stepper motors 25, 26, and 27, and four voltage amplifier followers 3, 4, 5, and 6 to control the rotation speed and direction of the stepper motors. There are three stepper motor drivers: (1) The first stepper motor driver 22 is connected to the first stepper motor 25, the first voltage amplifier follower 3, and the fourth voltage amplifier follower 6; (2) The second stepper motor driver 23 is connected to the second stepper motor 26, the second voltage amplifier follower 4, and the fourth voltage amplifier follower 6; (3) The third stepper motor driver 24 is connected to the third stepper motor 27, the third voltage amplifier follower 5, and the fourth voltage amplifier follower 6. By setting up three stepper motor drivers, the rotation of the corresponding three stepper motors can be automatically controlled.

[0235] Three stepper motors 25, 26, and 27 are connected to a driver and installed on the motor flanges of the three slide modules 28, 29, and 30. They control the linear motion of the ball screws in the slide modules, causing the slide sliders to move. A total of three stepper motors are provided: (1) the first stepper motor 25 is installed on the first slide (X-axis direction) 28; (2) the second stepper motor 26 is installed on the second slide (Y-axis direction) 29; and (3) the third stepper motor 27 is installed on the third slide (Z-axis direction) 30. By setting three stepper motors, the precise movement of the slide sliders in the XYZ axes can be automatically controlled.

[0236] Three slides 28, 29, and 30 constitute a slide module, wherein: (1) the first slide 28 is placed in the X-axis direction, its bottom is mounted on the optical plate 35, and its slider is tightly connected to the bottom of the second slide 29 with screws, so that the second slide 29 is placed in the Y-axis direction; (2) the second slide 29 is placed in the Y-axis direction, its bottom is connected to the slider of the first slide 28, and its slider is tightly connected to the bottom of the third slide 30 with screws, so that the third slide 30 is placed in the Z-axis direction; (3) the third slide 30 is placed in the Z-axis direction, its bottom is connected to the slider of the second slide 29, and its slider is tightly connected to the fixing bracket 20 of the test electrode with screws, so that the fixing bracket 20 of the test electrode can move arbitrarily along the XYZ axes, thereby allowing the test electrode 19 to move arbitrarily in space.

[0237] Three stepper motor drivers 22, 23, and 24, three stepper motors 25, 26, and 27, and three slides 28, 29, and 30 are used in combination. Under the control of the control module, the speed and direction of the stepper motor rotation are automatically and precisely controlled, driving the slides in the XYZ three-axis directions to move finely, thereby allowing the test electrode 19 fixed to the slide to move arbitrarily and change the spatial position of the test electrode 19.

[0238] In embodiment 1, the fixing module includes a fixing frame 31, a fixing rod 32, a fixing clamp 33, and a base plate 34, wherein:

[0239] The fixing frame 31 is a frame-shaped integrated structure that is vertically and stably placed on the optical plate 35, and includes a top plate and a support plate. The central area of ​​the top plate of the fixing frame 31 is hollowed out, and several fixing holes are evenly distributed around it for fixing with the fixing rod 32 and for allowing the wires of the emitting electrode to pass through. The four corners of the top plate are supported by vertical support plates of a certain thickness.

[0240] The fixing rod 32 consists of cuboid blocks at both ends and a vertical rod in the middle. The fixing rod 32 is connected to the fixing frame 31 and the base plate 34 through fixing holes on the cuboid blocks at both ends, and is vertically fixed between the top plate of the fixing frame 31 and the base plate 34. Several small holes are evenly distributed on the vertical rod in the middle of the fixing rod 32. The diameter of the holes is similar to the diameter of the metal rods of the three sets of emitting electrodes 16, 17, and 18, allowing the metal rods to pass through the small holes and remain stable, thereby fixing the emitting electrodes inside the test container.

[0241] The fixing clip 33 is a rectangular block with a certain thickness. There is a small through hole on the left and right sides. The top side opens from top to bottom at the center line. The middle section of the opening is cylindrical and hollow. The diameter is similar to the diameter of the metal rods of the three sets of emitting electrodes 16, 17 and 18. The metal rods pass through the cylindrical hollow in the middle section. Screws are passed through the small holes on the left and right sides and tightened to clamp the emitting electrodes.

[0242] The base plate 34 is an octagonal plate with a certain thickness, and several fixing holes are evenly distributed around the central area for mechanical connection with the fixing rod 32.

[0243] In embodiment 1, the fixing module further includes an optical plate 35, a lifting platform 36, and a cylindrical container 37, wherein:

[0244] Four optical plates 35 of different sizes are provided to form the base. A larger rectangular optical plate 35 serves as the main body, and two smaller rectangular optical plates 35 are fixed on both sides of the larger rectangular optical plate 35 as extension arms. The three are fixed as a whole and placed on a higher worktable. Three slides 28, 29, and 30 are assembled and installed on the larger rectangular optical plate 35. Another square optical plate 35 is placed on a lower worktable, and the lifting platform 36 and the cylindrical container 37 are placed on the lower square optical plate.

[0245] The lifting platform 36 includes a handwheel, a high-precision ruler, and a worktable. By manually rotating the handwheel according to the high-precision ruler, the height of the worktable of the lifting platform 36 can be precisely changed.

[0246] The cylindrical container 37 is hollow and uncovered, and is fixed to the worktable of the lifting platform 36, together forming a liftable test container. During testing, the cylindrical container 37 is filled with a liquid conductive medium, and the vertical height of the cylindrical container 37 can be quickly changed by rotating the handwheel of the lifting platform 36.

[0247] During the experiment of measuring the three-dimensional electric field distribution, the microcontroller 1 in the control module outputs control signals, which are transmitted to the electrical signal transmission module and the movement module through the USB-6361 multi-function I / O device 2 and multiple independent voltage amplifier followers 3, 4, 5, 6, 7, 8, and 9. This controls the electrical signal output of multiple sets of emitting electrodes 16, 17, and 18, changes the spatial position of the test electrode 19, and is equivalent to rotating the emitting electrode, thus realizing the measurement of the three-dimensional electric field distribution using a pair of test electrodes. The control module also receives the three-dimensional electric field distribution of the phase interference electric field measured by the voltage signal acquisition module and performs data processing and analysis. The fixing module is used to form a stable support structure, fixing multiple slides 28, 29, 30 and multiple sets of emitting electrodes 16, 17, 18, and forming a liftable test container. The spatial position of the emitting electrodes can be changed arbitrarily. Adjusting the handwheel of the lifting platform 36 raises the cylindrical container 37 filled with conductive medium. The multiple sets of emitting electrodes 16, 17, 18 and test electrodes 19 are completely immersed in the interior of the cylindrical container 37, forming a phase interference electric field inside the container and measuring the three-dimensional electric field distribution.

[0248] The above embodiments are merely illustrative of the present invention. Various modifications, alterations, and applications made by those skilled in the art within the spirit and scope of the present invention should fall within the scope of the present invention.

Claims

1. A measuring device for three-dimensional electric field distribution, characterized in that, The measuring device includes three sets of transmitting electrodes and one pair of test electrodes. The three sets of transmitting electrodes are fixed on three mutually orthogonal planes. Each set of transmitting electrodes can independently control the output of two AC signals. The three sets of transmitting electrodes output signals alternately in sequence. The test electrode can move arbitrarily in space to measure the electric field strength. Each set of transmitting electrodes has two pairs of electrodes and independently outputs two kilohertz-level AC signals. The measuring device includes a linear electric slide module and a fixing module. The linear electric slide module includes a first slide, a second slide, and a third slide. Each slide includes a linear guide rail and a slider. The bottom of the first slide is fixed to the fixing module. The bottom of the second slide is connected and fixed to the slider of the first slide. The bottom of the third slide is connected and fixed to the slider of the second slide. The three linear guide rails are orthogonal to each other. The linear electric slide module can move in the XYZ axes respectively. The fixing module includes a fixing frame, fixing rods, fixing clamps, a base plate, multiple optical plates, a lifting platform, and a cylindrical container; The fixing frame is an integral frame structure, consisting of a top plate and a support plate. The center area of ​​the top plate of the fixing frame is hollowed out, and several fixing holes are distributed around it. The four corners of the top plate are supported by vertical support plates of a certain thickness, so that the fixing frame is placed vertically and stably on the optical plate. The fixing rod consists of cuboid blocks at both ends and a vertical rod in the middle; each of the cuboid blocks at both ends of the fixing rod has two symmetrically distributed fixing holes, the diameter and spacing of which are adapted to the fixing holes on the top and bottom plates of the fixing frame, for connecting the fixing frame and the bottom plate, so that the fixing rod is vertically fixed between the top and bottom plates of the fixing frame; the vertical rod has several small holes evenly distributed on it, the diameter of which is similar to the diameter of the metal rod of the emitting electrode; The fixing clip is a rectangular block with a certain thickness; the left and right sides of the fixing clip have a through hole, and the upper side opens from top to bottom at the center line. The middle section of the opening is cylindrical and hollow, and its diameter is similar to the diameter of the metal rod of the emitting electrode. Several fixing holes are distributed around the central area of ​​the base plate; The fixed frame, fixed rod, fixed clamp and base plate are used together to form a support body, which provides fixed positions for the three sets of emitting electrodes. The metal rod of the emitting electrode is passed through the small hole on the vertical rod of the fixed rod, and then the metal rod is fixed in the cylindrical hollow of the fixed clamp to clamp and fix the emitting electrode. The multiple optical plates form a base, with a larger optical plate as the main body. Two smaller optical plates are fixed to the sides of the larger optical plate with screws as extension arms. The three are placed together on a workbench. Another optical plate is placed separately on a lower workbench. Three slides are mounted on the larger optical plate. A lifting platform and a cylindrical container are fixed on the lower optical plate. The cylindrical container is fixed on the lifting platform. The lifting platform and the cylindrical container constitute a liftable insulation test container.

2. The measuring device as described in claim 1, characterized in that, The test electrode is a coaxial line or two enameled wires, suspended vertically; the upper end of the test electrode is connected to a signal amplifier.

3. The measuring device as described in claim 1, characterized in that, The measuring device also includes a fixing bracket for the test electrode, which is fixed on the fixing bracket. The fixing bracket for the test electrode is fixedly connected to the slider of the third slide, and the fixing bracket for the test electrode can move arbitrarily along the XYZ axes.

4. The measuring device as described in claim 1 or 3, characterized in that, The lifting platform includes a handwheel, a high-precision ruler, and a work surface. Fixing holes are evenly distributed on the work surface, and the area of ​​the work surface is similar to the bottom surface of the cylindrical container. The cylindrical container is vertically fixed on the work surface of the lifting platform, and the two form a whole. The spatial position of the cylindrical container can be changed by adjusting the handwheel of the lifting platform.

5. The measuring device as described in claim 4, characterized in that, The fixed frame, fixed rod, fixed clamp, base plate and cylindrical container are all made of insulating, waterproof and rigid materials. All structures immersed in the liquid conductive medium inside the cylindrical container are connected by plastic screws.

6. The measuring device according to any one of claims 1-3 or 5, characterized in that, The measuring device includes an electrical signal transmission module, a voltage signal acquisition module, a movement module, and a control module; The electrical signal transmission module includes a signal generator, two signal amplifiers, three relays, and three sets of transmitting electrodes. The signal generator is connected to the signal amplifiers, and each signal amplifier is connected to each of the relays in pairs. Each relay is connected to a voltage amplifier follower and a transmitting electrode. The signal generator, the first signal amplifier, and the second signal amplifier are used to generate and output two independent electrical stimulation signals. The first, second, and third relays receive the two independent electrical stimulation signals and, in response to the control signal from the control module, control the signal paths of the first, second, and third sets of transmitting electrodes to be switched on and off, respectively. The control signal is configured to turn on any one of the first, second, and third relays, while turning off the other two, so that the set of transmitting electrodes corresponding to the switched-on relay outputs an electrical stimulation signal, while the other two sets of transmitting electrodes do not output electrical stimulation signals, thus allowing the electrical stimulation signals to be output sequentially. The voltage signal acquisition module is used to measure the three-dimensional electric field distribution at any point in the three-dimensional electric field space. The voltage signal acquisition module includes a test electrode, a fixing bracket for the test electrode, wires, and a third signal amplifier. The end of the extension arm of the fixing bracket for the test electrode opens from the outside to the inside, and several through holes are evenly distributed on the left and right sides, which can be used to vertically fix the test electrode. Several U-shaped wire clamps are installed on the upper surface of the extension arm of the fixing bracket for the test electrode to fix the wires of the test electrode. The moving module is used for automated and precise movement of the test electrode. The moving module includes three stepper motor drivers, three stepper motors, and three slides. Each stepper motor is connected to a stepper motor driver and a slide at both ends. The three stepper motor drivers receive control signals from the control module and independently control the rotational speed and direction of the three stepper motors. The first, second, and third stepper motors drive the sliders on the first, second, and third slides to move. The slider of the third slide is used to fix a mounting bracket for the test electrode. By controlling the movement of the three stepper motors, the moving module can precisely move the test electrode in the XYZ axes to change its spatial position. The control module includes a central processing unit (CPU), input / output devices, and seven voltage amplification followers for outputting control signals and analyzing and processing voltage signals. The CPU is connected to the input / output devices. The control module is configured to: output a control program through the input / output devices, which are connected to the seven voltage amplification followers and transmit control signals to the electrical signal transmission module and the motion module respectively via the seven voltage amplification followers; receive three-dimensional electric field distribution data from the voltage signal acquisition module and transmit the data to the CPU for processing through the input / output devices; wherein, the first to third voltage amplification followers are respectively connected to the first to third stepper motor drivers to control the rotational speed of the three stepper motors; the fourth voltage amplification follower is simultaneously connected to the three stepper motor drivers to synchronously control the rotational direction of the three stepper motors; and the fifth to seventh voltage amplification followers are respectively connected to the first to third relays to control the sequential output of electrical stimulation signals from the three sets of transmitting electrodes.

7. The measuring device as described in claim 4, characterized in that, The measuring device includes an electrical signal transmission module, a voltage signal acquisition module, a movement module, and a control module; The electrical signal transmission module includes a signal generator, two signal amplifiers, three relays, and three sets of transmitting electrodes. The signal generator is connected to the signal amplifiers, and each signal amplifier is connected to each of the relays in pairs. Each relay is connected to a voltage amplifier follower and a transmitting electrode. The signal generator, the first signal amplifier, and the second signal amplifier are used to generate and output two independent electrical stimulation signals. The first, second, and third relays receive the two independent electrical stimulation signals and, in response to the control signal from the control module, control the signal paths of the first, second, and third sets of transmitting electrodes to be switched on and off, respectively. The control signal is configured to turn on any one of the first, second, and third relays, while turning off the other two, so that the set of transmitting electrodes corresponding to the switched-on relay outputs an electrical stimulation signal, while the other two sets of transmitting electrodes do not output electrical stimulation signals, thus allowing the electrical stimulation signals to be output sequentially. The voltage signal acquisition module is used to measure the three-dimensional electric field distribution at any point in the three-dimensional electric field space. The voltage signal acquisition module includes a test electrode, a fixing bracket for the test electrode, wires, and a third signal amplifier. The end of the extension arm of the fixing bracket for the test electrode opens from the outside to the inside, and several through holes are evenly distributed on the left and right sides, which can be used to vertically fix the test electrode. Several U-shaped wire clamps are installed on the upper surface of the extension arm of the fixing bracket for the test electrode to fix the wires of the test electrode. The moving module is used for automated and precise movement of the test electrode. The moving module includes three stepper motor drivers, three stepper motors, and three slides. Each stepper motor is connected to a stepper motor driver and a slide at both ends. The three stepper motor drivers receive control signals from the control module and independently control the rotational speed and direction of the three stepper motors. The first, second, and third stepper motors drive the sliders on the first, second, and third slides to move. The slider of the third slide is used to fix a mounting bracket for the test electrode. By controlling the movement of the three stepper motors, the moving module can precisely move the test electrode in the XYZ axes to change its spatial position. The control module includes a central processing unit (CPU), input / output devices, and seven voltage amplification followers for outputting control signals and analyzing and processing voltage signals. The CPU is connected to the input / output devices. The control module is configured to: output a control program through the input / output devices, which are connected to the seven voltage amplification followers and transmit control signals to the electrical signal transmission module and the motion module respectively via the seven voltage amplification followers; receive three-dimensional electric field distribution data from the voltage signal acquisition module and transmit the data to the CPU for processing through the input / output devices; wherein, the first to third voltage amplification followers are respectively connected to the first to third stepper motor drivers to control the rotational speed of the three stepper motors; the fourth voltage amplification follower is simultaneously connected to the three stepper motor drivers to synchronously control the rotational direction of the three stepper motors; and the fifth to seventh voltage amplification followers are respectively connected to the first to third relays to control the sequential output of electrical stimulation signals from the three sets of transmitting electrodes.

8. The measuring device as described in claim 7, characterized in that, The fixing holes on the fixed frame and the fixing holes on the base plate are evenly distributed, and the central processing unit is a computer.

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