A method for measuring the electric field of liquid dielectrics in a confined space and related devices

Abstract

The present invention relates to the technical field of electrical equipment maintenance design, and particularly to a method and related device for measuring the electric field of liquid dielectrics in a confined space. The method includes: setting the angle of the laser entering the reflection cavity, as well as the incident port and the exit port, so that the laser undergoes multiple reflections in the reflection cavity to extend the optical path length. An optical detector and a laser generator are respectively arranged at the exit port and the incident port, and a polarizer and an analyzer are arranged outside the exit port and the incident port. After placing the reflection cavity in the liquid dielectric with an unknown electric field applied, the electric field strength is obtained by substituting the incident light intensity, the exit light intensity, the optical path length, and the Kerr constant of the liquid medium into the electric field strength model. The design of the cylindrical tube reflection cavity enables the propagation path of light in the liquid dielectric electric field to satisfy the optical path length, so that when calculating the electric field strength, the influence of the Kerr constant with an extremely small order of magnitude on the result can be reduced with a longer optical path length, reducing the error of electric field measurement and improving the safety and reliability of electrical equipment design and operation and maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment maintenance design, and particularly to a method for measuring the electric field of liquid dielectrics in a confined space and related devices. Background Art

[0002] Due to its excellent insulation performance, self-recovery characteristics, shape adaptability, and heat dissipation effects, liquid dielectrics are widely used in various electrical equipment with complex structures. The strong electric field distribution in liquid dielectrics may cause the breakdown of liquid dielectrics, thereby triggering electrical equipment failures. Therefore, accurately measuring the electric field distribution in liquid dielectrics is of great significance for the insulation structure design and operation status evaluation of electrical equipment.

[0003] However, in the measurement of the electric field of liquid dielectrics in a confined space in the prior art, the light path is very short due to the confined space, and the Kerr constant has an extremely small order of magnitude, resulting in a large error in the calculated electric field strength, which poses a safety hazard to the design and operation of electrical equipment. Summary of the Invention

[0004] The present invention provides a method for measuring the electric field of liquid dielectrics in a confined space, which is used to solve the problem of large error in the calculated electric field strength caused by the short light path in the confined space in the prior art.

[0005] The first aspect of the present invention provides a method for measuring the electric field of liquid dielectrics in a confined space, including: opening an incident port on a cylindrical barrel reflection cavity and presetting the optical path length in the cylindrical barrel reflection cavity; according to the optical path length, setting the angle between the laser beam incident on the cylindrical barrel reflection cavity and the perpendicular connection line of the incident port and the axis of the cylindrical barrel reflection cavity, so that when the laser beam is reflected in the cylindrical barrel reflection cavity, the path passed by the laser beam in the cylindrical barrel reflection cavity is equal to the optical path length, obtaining the incident angle, and opening an exit port at the reflection point of this reflection;

[0006] Setting a laser generator so that the incident port is in the laser emission direction of the laser generator, and the angle between the laser emission direction and the perpendicular connection line of the incident port and the axis of the cylindrical barrel reflection cavity is equal to the incident angle; setting a photodetector to receive the laser beam emitted from the exit port, setting a polarizer between the laser generator and the incident port, and setting an analyzer between the photodetector and the exit port;

[0007] Placing the cylindrical barrel reflection cavity in the liquid dielectric, and after applying an unknown electric field to the liquid dielectric, starting the laser generator; respectively obtaining the incident light intensity and the exit light intensity in the laser generator and the photodetector, and substituting the incident light intensity, the exit light intensity, the optical path length, and the Kerr constant of the liquid dielectric into the electric field strength model to obtain the electric field strength of the unknown electric field; the specific electric field strength calculation model is:

[0008]

[0009] Wherein, I1 is the emitted light intensity, I0 is the incident light intensity, K is the Kerr constant, L is the optical path length, and E is the electric field strength.

[0010] Optionally, the angle at which the laser enters the cylindrical barrel reflection cavity with respect to the perpendicular connection line between the incident port and the axis of the cylindrical barrel reflection cavity is specifically set according to the optical path length as follows:

[0011] Calculate the chord length that can divide the optical path length evenly and is less than the diameter of the cylindrical barrel reflection cavity, and calculate the required incident angle according to the sine theorem.

[0012] Optionally, after obtaining the electric field strength of the unknown electric field, it further includes:

[0013] If the electric field strength of the unknown electric field is variable, then according to the relationship between the polarization directions of the analyzer and the polarizer and the change of the emitted light intensity, the current electric field strength is obtained by using the variable field strength calculation model. The specific variable field strength calculation model is as follows:

[0014]

[0015] Wherein, E m is the basic field strength, and the calculation formula is n is the fringe order number, and the fringe order number is the number of times the relative light intensity rises from 0 to 1 or falls from 1 to 0 plus one at the current relative field strength in the relative light intensity and relative field strength curve graph.

[0016] Optionally, the cylindrical barrel reflection cavity is specifically an annular reflection cavity, and the inner wall of the annular reflection cavity is a reflector.

[0017] The second aspect of the present application provides a liquid dielectric electric field measurement device for a confined space, including:

[0018] A reflection cavity setting module, configured to open an incident port on the cylindrical barrel reflection cavity and preset the optical path length in the cylindrical barrel reflection cavity; according to the optical path length, set the angle at which the laser enters the cylindrical barrel reflection cavity with respect to the perpendicular connection line between the incident port and the axis of the cylindrical barrel reflection cavity, so that when the laser is reflected in the cylindrical barrel reflection cavity, the path passed by the laser in the cylindrical barrel reflection cavity is equal to the optical path length, obtain the incident angle, and open an exit port at the reflection point of this reflection;

[0019] A laser measurement module, configured to set a laser generator so that the incident port is in the laser emission direction of the laser generator, and the laser emission direction is equal to the incident angle with respect to the perpendicular connection line between the incident port and the axis of the cylindrical barrel reflection cavity; set a photodetector to receive the laser emitted from the exit port, and set a polarizer between the laser generator and the incident port and an analyzer between the photodetector and the exit port;

[0020] An electric field strength calculation module is configured to place a cylindrical cavity resonator in a liquid dielectric, and after an unknown electric field is applied to the liquid dielectric, start a laser generator; obtain the incident light intensity and the outgoing light intensity in the laser generator and the photodetector respectively, and substitute the incident light intensity, the outgoing light intensity, the optical path length, and the Kerr constant of the liquid dielectric into an electric field strength model to obtain the electric field strength of the unknown electric field; the specific form of the electric field strength calculation model is as follows:

[0021]

[0022] In the formula, I1 is the outgoing light intensity, I0 is the incident light intensity, K is the Kerr constant, L is the optical path length, and E is the electric field strength.

[0023] Optionally, in the reflection cavity setting module, according to the optical path length, the angle at which the laser enters the cylindrical cavity resonator and is perpendicular to the connecting line between the incident port and the axis of the cylindrical cavity resonator is specifically set as follows:

[0024] Calculate the chord length that can divide the optical path length evenly, and this chord length is less than the diameter of the cylindrical cavity resonator, and calculate the required incident angle according to the sine theorem.

[0025] Optionally, it further includes a varying field strength calculation module:

[0026] The varying field strength calculation module is configured to obtain the current electric field strength according to the relationship between the polarization directions of the analyzer and the polarizer and the change of the outgoing light intensity, and the specific form of the varying field strength calculation model is as follows:

[0027]

[0028] In the formula, E m is the basic field strength, and the calculation formula is n is the fringe order number, and the fringe order number is the number of times the relative light intensity rises from 0 to 1 or falls from 1 to 0 plus one under the current relative field strength in the relative light intensity and relative field strength curve graph.

[0029] Optionally, in the reflection cavity setting module, the cylindrical cavity resonator is specifically an annular cavity resonator, and the inner wall of the annular cavity resonator is a reflector.

[0030] A third aspect of the present application provides a liquid dielectric electric field measurement device for a confined space, and the device includes a processor and a memory:

[0031] The memory is configured to store program codes and transmit the program codes to the processor;

[0032] The processor is configured to execute the liquid dielectric electric field measurement method for a confined space according to any one of the first aspects of the present invention according to the instructions in the program codes.

[0033] A fourth aspect of the present application provides a computer-readable storage medium, characterized in that the computer-readable storage medium is used to store program code, and the program code is used to execute any one of the methods for measuring the electric field of the liquid dielectric in the limited space of the first aspect of the present invention.

[0034] From the above technical solutions, it can be seen that the present invention has the following advantages: By opening an incident port on the cylindrical barrel reflection cavity and presetting the optical path length in the cylindrical barrel reflection cavity; according to the optical path length, setting the angle between the laser when it enters the cylindrical barrel reflection cavity and the perpendicular connection line of the incident port and the axis of the cylindrical barrel reflection cavity, so that when the laser is reflected in the cylindrical barrel reflection cavity, the path that the laser passes through in the cylindrical barrel reflection cavity is equal to the optical path length, obtaining the incident angle, and opening an exit port at the reflection point of this reflection; setting a laser generator so that the incident port is in the laser emission direction of the laser generator, and the angle between the laser emission direction and the perpendicular connection line of the incident port and the axis of the cylindrical barrel reflection cavity is equal to the incident angle; setting a photodetector to receive the laser emitted from the exit port, setting a polarizer between the laser generator and the incident port, and setting an analyzer between the photodetector and the exit port; placing the cylindrical barrel reflection cavity in the liquid dielectric, and after applying an unknown electric field to the liquid dielectric, starting the laser generator; respectively obtaining the incident light intensity and the exit light intensity in the laser generator and the photodetector, substituting the incident light intensity, the exit light intensity, the optical path length, and the Kerr constant of the liquid dielectric into the electric field intensity model to obtain the electric field intensity of the unknown electric field; designing the cylindrical barrel reflection cavity so that the path of the optical path propagating in the liquid dielectric in the electric field satisfies the preset optical path length, so that when calculating the electric field intensity, the influence of the Kerr constant with an extremely small order of magnitude on the result can be reduced with a longer optical path length, reducing the error of the electric field measurement, and improving the safety and reliability of the design and operation and maintenance of electrical equipment. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0036] Figure 1 It is a flowchart of the method for measuring the electric field of the liquid dielectric in the limited space;

[0037] Figure 2 It is a graph of the relative light intensity and the relative field intensity when the polarization directions of the polarizer and the analyzer are parallel;

[0038] Figure 3It is a graph of relative light intensity and relative field strength when the polarization directions of the polarizer and analyzer are perpendicular.

[0039] Figure 4 It is a diagram of an electric field measurement device for liquid dielectrics in a confined space. Detailed implementation manners

[0040] To make the objectives, features, and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described below are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0041] The present invention provides a method for measuring the electric field of liquid dielectrics in a confined space, which is used to solve the problem of large error in the calculated electric field strength due to the short optical path in the confined space in the prior art.

[0042] Please refer to Figure 1 , Figure 1 It is the first flowchart of the method for measuring the electric field of liquid dielectrics in a confined space provided by the embodiment of the present invention.

[0043] S100, an incident port is opened on the cylindrical barrel reflection cavity, and the optical path length in the cylindrical barrel reflection cavity is preset; according to the optical path length, the angle between the laser beam entering the cylindrical barrel reflection cavity and the perpendicular connection line of the incident port and the axis of the cylindrical barrel reflection cavity is set, so that when the laser beam is reflected in the cylindrical barrel reflection cavity, the path passed by the laser beam in the cylindrical barrel reflection cavity is equal to the optical path length, obtaining the incident angle, and an exit port is opened at the reflection point of this reflection;

[0044] It should be noted that the cylindrical barrel reflection cavity is an annular cavity with a mirror inner wall. The measurement personnel can simulate the cylindrical barrel reflection cavity on the simulation software, and obtain the incident angle at which the total path of the laser beam reflection is equal to the preset optical path length during a certain reflection by adjusting the laser incident angle, record this reflection point as the exit port, and set this incident angle as the exit port to obtain the relative position of the incident port and the exit port; or calculate the chord length that can divide the optical path length evenly and the chord length is less than the diameter of the cylindrical barrel reflection cavity, and the required incident angle can be calculated according to the sine theorem; open the cylindrical barrel reflection cavity according to the relative position of the incident port and the exit port under the preset optical path length; the optical path length is set according to the actual requirements of the test to reduce the influence of the Kerr constant on the measurement accuracy.

[0045] S200. Set up a laser generator such that the incident port is in the laser emission direction of the laser generator, and the angle between the laser emission direction and the perpendicular connection line of the incident port and the axis of the cylindrical barrel reflection cavity is equal to the incident angle; set up a photodetector to receive the laser emitted from the exit port, set up a polarizer between the laser generator and the incident port, and set up an analyzer between the photodetector and the exit port.

[0046] It should be noted that after the polarizer converts the laser emitted by the laser generator into polarized light and then injects it into the cylindrical barrel reflection cavity, due to the birefringence characteristics of the liquid dielectric, the incident polarized light in the cylindrical barrel reflection cavity splits into two mutually perpendicular polarized lights for subsequent measurement of the electric field strength; the angle at which the photoelectric receiver receives the outgoing laser needs to be set according to the preset incident angle.

[0047] S300. Place the cylindrical barrel reflection cavity in the liquid dielectric, and after applying an unknown electric field to the liquid dielectric, start the laser generator; respectively obtain the incident light intensity and the outgoing light intensity in the laser generator and the photodetector, and substitute the incident light intensity, the outgoing light intensity, the optical path length, and the Kerr constant of the liquid dielectric into the electric field strength model to obtain the electric field strength of the unknown electric field; the specific electric field strength calculation model is:

[0048]

[0049] In the formula, I1 is the outgoing light intensity, I0 is the incident light intensity, K is the Kerr constant, L is the optical path length, and E is the electric field strength.

[0050] It should be noted that after starting the laser generator, the laser is converted into polarized light by the polarizer and injected into the cylindrical barrel reflection cavity. In the liquid dielectric under the unknown electric field, the incident polarized light splits into two mutually perpendicular polarized lights and the refractive indices of the two are changed by the influence of the electric field strength; therefore, the refractive index is related to the electric field strength, and the refractive index - field strength model can be obtained:

[0051]

[0052] In the formula, C0 is the speed of light in free space, C || and C ⊥ are the propagation speeds of the two polarized lights parallel and perpendicular to the electric field direction respectively, n || and n ⊥ are the refractive indices of the two polarized lights parallel and perpendicular to the electric field direction in the liquid respectively, and λ is the wavelength of light in free space.

[0053] After integrating the refractive index - field strength model with respect to the optical path length and multiplying by 2π / λ, the phase - difference - field strength model is obtained:

[0054]

[0055] In the formula, δ is the phase difference between the outgoing light and the incident light;

[0056] 2πKL on the right side of the phase difference field strength model 2 After the phase difference is converted into the light intensity ratio, it is transformed into the form of the electric field strength calculation model according to the relationship between the polarization directions of the analyzer and the polarizer; because the polarized light is split into two mutually perpendicular polarized lights in the cylindrical barrel reflection cavity, the photodetector can detect the light intensity whether the polarization directions of the analyzer and the polarizer are perpendicular or parallel to each other when passing through the analyzer. Therefore, the corresponding electric field strength calculation models are set respectively according to the relationship between the polarization directions of the analyzer and the polarizer, and selected according to the actual situation; substituting the incident light intensity, the outgoing light intensity, the optical path length, and the Kerr constant of the liquid dielectric into the electric field strength model, the electric field strength of the unknown electric field can be obtained. Generally speaking, the Kerr constant of the liquid dielectric is distributed in the range of 10 -15 -10 -12 m / V 2 and is selected according to the actual measurement requirements.

[0057] In this embodiment, an incident port is opened on the cylindrical barrel reflection cavity, and the optical path length in the cylindrical barrel reflection cavity is preset; according to the optical path length, the angle between the laser when it enters the cylindrical barrel reflection cavity and the perpendicular connection line of the incident port and the axis of the cylindrical barrel reflection cavity is set, so that when the laser is reflected in the cylindrical barrel reflection cavity, the path that the laser passes through in the cylindrical barrel reflection cavity is equal to the optical path length, and the incident angle is obtained, and an exit port is opened at the reflection point of this reflection; a laser generator is set so that the incident port is in the laser emission direction of the laser generator, and the angle between the laser emission direction and the perpendicular connection line of the incident port and the axis of the cylindrical barrel reflection cavity is equal to the incident angle; a photodetector is set to receive the laser emitted from the exit port, a polarizer is set between the laser generator and the incident port, and an analyzer is set between the photodetector and the exit port; the cylindrical barrel reflection cavity is placed in the liquid dielectric, and after an unknown electric field is applied to the liquid dielectric, the laser generator is started; the incident light intensity and the outgoing light intensity are respectively obtained from the laser generator and the photodetector, and the incident light intensity, the outgoing light intensity, the optical path length, and the Kerr constant of the liquid dielectric are substituted into the electric field strength model to obtain the electric field strength of the unknown electric field; the cylindrical barrel reflection cavity is designed so that the path of the optical path propagating in the liquid dielectric in the electric field satisfies the preset optical path length, so that when calculating the electric field strength, the influence of the Kerr constant with an extremely small order of magnitude on the result can be reduced with a longer optical path length, reducing the error of electric field measurement, and improving the safety and reliability of the design and operation and maintenance of electrical equipment.

[0058] The above is the detailed description of the first embodiment of a method for measuring the electric field of a liquid dielectric in a confined space provided by this application. The following is the detailed description of the second embodiment of a method for measuring the electric field of a liquid dielectric in a confined space provided by this application.

[0059] In this embodiment, a specific embodiment of a method for measuring the electric field of a liquid dielectric in a confined space is further provided. After obtaining the electric field strength of the unknown electric field in step S300, it further includes that if the electric field strength of the unknown electric field is variable, then according to the relationship between the polarization directions of the analyzer and the polarizer and the change of the outgoing light intensity, the current electric field strength is obtained by using the variable field strength calculation model. The specific variable field strength calculation model is as follows:

[0060]

[0061] In the formula, E m is the basic field strength, and the calculation formula is n is the fringe order number. The fringe order number is the number of times the relative light intensity rises from 0 to 1 or falls from 1 to 0 plus one under the current relative field strength in the relative light intensity and relative field strength curve graph.

[0062] It should be noted that the existing Kerr electro-optic field mapping method can only accurately measure the electric field strength when the optical path electric field is a constant value. If the electric field strength on the optical path is an electric field with different amplitudes, the measured electric field strength value is the result of the comprehensive action after the laser experiences multiple electric field strength changes during propagation, and it cannot reflect the accurate electric field amplitude at a certain position; the size of the annular reflection cavity in this application can be adjusted to at least the millimeter level, so as to accurately measure the electric field strength at a certain position; please refer to Figure 2 and Figure 3 , Figure 2 is the relative light intensity and relative field strength curve graph when the polarization directions of the polarizer and the analyzer are parallel, Figure 3 is the relative light intensity and relative field strength curve graph when the polarization directions of the polarizer and the analyzer are perpendicular. When the relative light intensity or relative field strength is obtained, the order number of the bright fringe or dark fringe corresponding to when the light intensity curve reaches the maximum or minimum value can be obtained in the relative light intensity and relative field strength curve graph, that is, the number of times the relative light intensity rises from 0 to 1 or falls from 1 to 0 plus one.

[0063] Further, in a more specific embodiment, the cylindrical tube reflection cavity can be set as a spherical reflection cavity, an annular reflection cavity or a concentric spherical reflection cavity, where the inner wall of the reflection cavity is a reflector, and the size of the cavity can be adjusted according to the confined space.

[0064] In this embodiment, according to the relationship between the polarization directions of the analyzer and the polarizer and the change of the outgoing light intensity in the variable field strength calculation model, the current electric field strength is calculated according to the light intensity curve.

[0065] The above is the detailed description of the second embodiment of a method for measuring the electric field of a liquid dielectric in a confined space provided by this application. The following is the detailed description of a device for measuring the electric field of a liquid dielectric in a confined space provided by the second aspect of this application.

[0066] Please refer to Figure 4 , Figure 4 which is a diagram of an electric field measurement device for liquid dielectrics in a confined space. This embodiment provides an electric field measurement device for liquid dielectrics in a confined space, including:

[0067] A reflection cavity setting module 10, which is used to open an incident port on the cylindrical reflection cavity and preset the optical path length in the cylindrical reflection cavity; according to the optical path length, set the angle between the laser beam entering the cylindrical reflection cavity and the perpendicular connection line between the incident port and the axis of the cylindrical reflection cavity, so that when the laser beam is reflected in the cylindrical reflection cavity, the path passed by the laser beam in the cylindrical reflection cavity is equal to the optical path length, obtain the incident angle, and open an exit port at the reflection point of this reflection;

[0068] A laser measurement module 20, which is used to set a laser generator so that the incident port is in the laser emission direction of the laser generator, and the angle between the laser emission direction and the perpendicular connection line between the incident port and the axis of the cylindrical reflection cavity is equal to the incident angle; set a photodetector to receive the laser beam emitted from the exit port, and set a polarizer between the laser generator and the incident port, and set an analyzer between the photodetector and the exit port;

[0069] An electric field strength calculation module 30, which is used to place the cylindrical reflection cavity in the liquid dielectric, and after an unknown electric field is applied to the liquid dielectric, start the laser generator; respectively obtain the incident light intensity and the exit light intensity in the laser generator and the photodetector, and substitute the incident light intensity, the exit light intensity, the optical path length, and the Kerr constant of the liquid dielectric into the electric field strength model to obtain the electric field strength of the unknown electric field; the specific form of the electric field strength calculation model is:

[0070]

[0071] In the formula, I1 is the exit light intensity, I0 is the incident light intensity, K is the Kerr constant, L is the optical path length, and E is the electric field strength.

[0072] Optionally, in the reflection cavity setting module, the specific method of setting the angle between the laser beam entering the cylindrical reflection cavity and the perpendicular connection line between the incident port and the axis of the cylindrical reflection cavity according to the optical path length is:

[0073] Calculate the chord length that can divide the optical path length evenly and is less than the diameter of the cylindrical reflection cavity, and calculate the required incident angle according to the sine theorem.

[0074] Optionally, it further includes a variable field strength calculation module 40:

[0075] The variable field strength calculation module 40 is configured to obtain the current electric field strength according to the relationship between the polarization directions of the analyzer and the polarizer and the change of the outgoing light intensity, and the variable field strength calculation model is specifically as follows:

[0076]

[0077] In the formula, E m is the basic field strength, and the calculation formula is n is the fringe order number, and the fringe order number is the number of times that the relative light intensity rises from 0 to 1 or drops from 1 to 0 under the current relative field strength in the relative light intensity and relative field strength curve diagram plus one.

[0078] Optionally, in the reflection cavity setting module, the cylindrical barrel reflection cavity is specifically an annular reflection cavity, and the inner wall of the annular reflection cavity is a reflector.

[0079] The third aspect of the present application further provides a liquid dielectric electric field measurement device for a confined space, including a processor and a memory: wherein the memory is used to store program codes and transmit the program codes to the processor; the processor is used to execute the above-mentioned liquid dielectric electric field measurement method for a confined space according to the instructions in the program codes.

[0080] The fourth aspect of the present application provides a computer-readable storage medium, which is characterized in that the computer-readable storage medium is used to store program codes, and the program codes are used to execute the above-mentioned liquid dielectric electric field measurement method for a confined space.

[0081] Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the above-described devices and equipment can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.

[0082] In several embodiments provided by the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in an electrical, mechanical or other form.

[0083] The unit described as a separation component may or may not be physically separated. The component shown as a unit may or may not be a physical unit, that is, it may be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0084] In addition, each functional unit in various embodiments of the present invention can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0085] If the above integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0086] As described above, the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of various embodiments of the present invention.

Claims

1. A method for measuring the electric field of a liquid dielectric in a confined space, characterized in that, Including: An incident port is opened on the cylindrical barrel reflection cavity, and the optical path length in the cylindrical barrel reflection cavity is preset; according to the optical path length, the angle between the laser emission direction when the laser enters the cylindrical barrel reflection cavity and the perpendicular connection line between the incident port and the axis of the cylindrical barrel reflection cavity is set, so that when the laser is reflected in the cylindrical barrel reflection cavity, the path that the laser passes through in the cylindrical barrel reflection cavity is equal to the optical path length, obtaining the incident angle, and an exit port is opened at the reflection point of this reflection; A laser generator is set so that the incident port is in the laser emission direction of the laser generator, and the angle between the laser emission direction and the perpendicular connection line between the incident port and the axis of the cylindrical barrel reflection cavity is equal to the incident angle; a photodetector is set to receive the laser emitted from the exit port, a polarizer is set between the laser generator and the incident port, and an analyzer is set between the photodetector and the exit port; The cylindrical barrel reflection cavity is placed in a liquid dielectric, and after an unknown electric field is applied to the liquid dielectric, the laser generator is started; The incident light intensity and the exit light intensity are respectively obtained in the laser generator and the photodetector, and the incident light intensity, the exit light intensity, the optical path length and the Kerr constant of the liquid dielectric are substituted into the electric field strength model to obtain the electric field strength of the unknown electric field; the specific electric field strength calculation model is: ； In the formula, I1 is the exit light intensity, I0 is the incident light intensity, K is the Kerr constant, L is the optical path length, and E is the electric field strength; After obtaining the electric field strength of the unknown electric field, if the electric field strength of the unknown electric field is variable, according to the relationship between the polarization directions of the analyzer and the polarizer and the change situation of the exit light intensity, the current electric field strength is obtained by using the variable field strength calculation model, and the specific variable field strength calculation model is: ； In the formula, is the basic field strength, and the calculation formula is , where n is the fringe order number, and the fringe order number is the number of times the relative light intensity rises from 0 to 1 or drops from 1 to 0 under the current relative field strength in the relative light intensity - relative field strength curve diagram, plus one.

2. The method for measuring the electric field of a liquid dielectric in a confined space according to claim 1, characterized in that, The specific method for setting the angle between the laser when it enters the cylindrical barrel reflection cavity and the perpendicular connection line between the incident port and the axis of the cylindrical barrel reflection cavity according to the optical path length is: Calculate the chord length that can divide the optical path length evenly, and this chord length is less than the diameter of the cylindrical barrel reflection cavity, and calculate the required incident angle according to the sine theorem.

3. The method for measuring the electric field of a liquid dielectric in a confined space according to claim 1, characterized in that, The cylindrical barrel reflection cavity is specifically an annular reflection cavity, and the inner wall of the annular reflection cavity is a reflector.

4. A device for measuring the electric field of a liquid dielectric in a confined space, characterized in that, Including: A reflection cavity setting module, which is used to open an incident port on the cylindrical barrel reflection cavity and preset the optical path length in the cylindrical barrel reflection cavity; according to the optical path length, set the angle between the laser when it enters the cylindrical barrel reflection cavity and the perpendicular connection line between the incident port and the axis of the cylindrical barrel reflection cavity, so that when the laser is reflected in the cylindrical barrel reflection cavity, the path that the laser passes through in the cylindrical barrel reflection cavity is equal to the optical path length, obtaining the incident angle, and an exit port is opened at the reflection point of this reflection; A laser measurement module, which is used to set a laser generator so that the incident port is in the laser emission direction of the laser generator, and the angle between the laser emission direction and the perpendicular connection line between the incident port and the axis of the cylindrical barrel reflection cavity is equal to the incident angle; set a photodetector to receive the laser emitted from the exit port, set a polarizer between the laser generator and the incident port, and set an analyzer between the photodetector and the exit port; An electric field strength calculation module, which is used to place a cylindrical cavity resonator in a liquid dielectric, start a laser generator, obtain the incident light intensity and the outgoing light intensity in the laser generator and the photodetector respectively, and substitute the incident light intensity, the outgoing light intensity, the optical path length and the Kerr constant of the liquid dielectric into an electric field strength model to obtain the electric field strength of an unknown electric field; the specific form of the electric field strength calculation model is as follows: ； In the formula, I1 is the outgoing light intensity, I0 is the incident light intensity, K is the Kerr constant, L is the optical path length, and E is the electric field strength; A varying electric field strength calculation module, which is used to obtain the current electric field strength according to the relationship between the polarization directions of the analyzer and the polarizer and the change of the outgoing light intensity, and the specific form of the varying electric field strength calculation model is as follows: ； In the formula, is the basic field strength, and the calculation formula is , where n is the fringe order number, and the fringe order number is the number of times the relative light intensity rises from 0 to 1 or falls from 1 to 0 under the current relative field strength in the relative light intensity and relative field strength curve diagram, plus one.

5. The device for measuring the electric field of a liquid dielectric in a confined space according to claim 4, characterized in that, In the reflection cavity setting module, according to the optical path length, the angle at which the laser enters the cylindrical cavity resonator and is perpendicular to the connecting line between the incident port and the axis of the cylindrical cavity resonator is specifically: Calculate the chord length that can divide the optical path length evenly and is less than the diameter of the cylindrical cavity resonator, and calculate the required incident angle according to the sine theorem.

6. The device for measuring the electric field of a liquid dielectric in a confined space according to claim 4, characterized in that, In the reflection cavity setting module, the cylindrical cavity resonator is specifically an annular cavity resonator, and the inner wall of the annular cavity resonator is a reflector.

7. A device for measuring the electric field of a liquid dielectric in a confined space, characterized in that, The device includes a processor and a memory: The memory is used to store program codes and transmit the program codes to the processor; The processor is used to execute the method for measuring the electric field of the liquid dielectric in the confined space according to any one of claims 1-3 according to the instructions in the program codes.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store program codes, and the program codes are used to execute the method for measuring the electric field of the liquid dielectric in the confined space according to any one of claims 1-3.

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