Method for preparing a sample of a bubble-containing silica gel, method and system for detecting the bubble content

Abstract

This invention provides a method for preparing a silica gel sample containing air bubbles, a method for detecting air bubble content, and a system for such detection, belonging to the field of high-voltage insulation. The preparation method includes: dividing the silica gel sample into three portions; filling the first portion of the silica gel sample into a container and degassing it; stirring the second portion of the silica gel sample to introduce air bubbles, and then pouring the stirred second portion into the container; degassing the third portion of the silica gel sample, and then pouring the degassed third portion into the container to obtain a silica gel sample containing air bubbles. This method can prepare a silica gel sample containing air bubbles at a target location without damaging the integrity of the silica gel. By acquiring images of the silica gel sample containing air bubbles, weighting and summing the RGB values ​​of the images, and combining this with the average grayscale value of pixels in an image of a silica gel sample without air bubbles, the air bubble content of the silica gel sample containing air bubbles can be accurately calculated.

Description

Technical Field

[0001] This invention relates to the field of high voltage insulation, and in particular to a method for preparing a bubble-containing silica gel sample, a method for detecting bubble content, and a system thereof. Background Technology

[0002] High-voltage, high-power devices are core components of high-voltage direct current (HVDC) equipment. Due to their small size, these devices have extremely high internal electric field strengths, with some areas reaching 10 ohms. 5 The voltage drop is on the order of V / mm, which places extremely high demands on the insulation level inside the device. In engineering, silicone gel is commonly used to pot devices to enhance the internal insulation level and strengthen the overall integrity of the device, thus improving its performance and parameter stability. Therefore, the insulation properties of silicone gel, as an insulating medium, are a key factor limiting the device's withstand voltage and lifespan.

[0003] Existing commercial silicone gels typically introduce air bubbles during their preparation. Due to the low dielectric strength and small dielectric constant of these bubbles, their presence significantly reduces the material's insulation performance, leading to partial discharge, reduced device lifespan, and even device breakdown. However, current degassing methods cannot completely remove these bubbles. Furthermore, under the high-temperature environment of device operation, some tiny bubbles can evolve into larger ones. Therefore, bubbles appear to be an unavoidable weak point in the insulation of silicone gels used for device encapsulation, necessitating research into their discharge characteristics. However, current experimental setups and methods for studying the discharge characteristics of bubbles within silicone gels still have limitations.

[0004] Firstly, current experiments on the discharge characteristics of bubble-containing silicone gels mainly involve breakdown tests using a spherical electrode structure. In this electrode structure, although the presence of bubbles distorts the electric field, the overall electric field distribution between the electrodes remains relatively uniform. After discharge inside the bubbles, the sample immediately breaks down, making it impossible to obtain further discharge experimental data.

[0005] Secondly, existing methods for preparing air bubbles within silica gel involve first filling the sample with water and then injecting air bubbles into the target location using a syringe. Obviously, this method punctures the silica gel during bubble injection, and the needle, when withdrawing the syringe, causes deformation of the solidified silica gel due to the adhesive effect of the gel. Therefore, this method compromises the integrity of the silica gel, hindering further experimental work.

[0006] Finally, existing experiments only distinguish whether or not bubbles are present in silicone gels, but lack quantitative assessment of bubbles. This is clearly a problem that needs further improvement for studying the bubble discharge characteristics within organosilicon gels. Summary of the Invention

[0007] The purpose of this invention is to provide a method for preparing silica gel samples containing air bubbles, a method and system for detecting air bubble content, which can prepare silica gel samples containing air bubbles at target locations without damaging the integrity of the silica gel, and accurately calculate the air bubble content.

[0008] To achieve the above objectives, the present invention provides the following solution:

[0009] A method for preparing a silica gel sample containing air bubbles, comprising:

[0010] The silica gel sample was divided into three parts;

[0011] The first silica gel sample was filled into a container and degassed.

[0012] The second silicone gel sample was stirred to introduce air bubbles into it, and then the stirred second silicone gel sample was poured into the container.

[0013] The third silica gel sample was degassed and then poured into the container to obtain a silica gel sample containing air bubbles. The silica gel samples containing air bubbles are, from bottom to top, the first silica gel sample, the second silica gel sample after stirring, and the third silica gel sample after degasing.

[0014] Optionally, after the step of filling the first silica gel sample into a container and performing degassing treatment, the method for preparing the silica gel sample containing air bubbles further includes:

[0015] The container, the second silicone gel sample, and the third silicone gel sample were left to stand in an environment with a set temperature for a set period of time.

[0016] Optionally, the set temperature is 25°C and the set time period is 105 minutes.

[0017] Optionally, the container is a discharge experimental device; the discharge experimental device includes a shell, a grounding electrode, and a needle electrode;

[0018] The top and bottom of the outer shell are made of transparent material;

[0019] Both the grounding electrode and the needle electrode pass through the side wall of the housing, and the grounding electrode and the needle electrode are arranged opposite to each other;

[0020] The grounding electrode and the needle electrode are used to discharge the bubble-containing silica gel sample; the second silica gel sample after stirring is located between the grounding electrode and the needle electrode.

[0021] Optionally, the method for preparing the bubble-containing silica gel sample further includes:

[0022] Side-chain hydrogen-containing silicone oil and polymethylvinylsiloxane were mixed to obtain a silicone gel sample.

[0023] To achieve the above objectives, the present invention also provides the following solution:

[0024] A method for detecting bubble content, comprising:

[0025] Images of bubble-free silica gel samples were acquired to obtain reference images;

[0026] The red, green, and blue values ​​of each pixel in the reference image are weighted and summed to obtain the grayscale value of each pixel in the reference image.

[0027] Calculate the average gray value based on the gray value of each pixel in the reference image;

[0028] The bottom of a container holding a sample of silica gel containing air bubbles is placed on a black background, and an image of the top of the container is captured to obtain the image to be tested; the top and bottom of the container are made of transparent material.

[0029] For any pixel in the image to be detected, the red, green and blue values ​​of the pixel are weighted and summed to obtain the initial gray value of the pixel.

[0030] The mapped gray value of the pixel is determined based on the initial gray value of the pixel and the average gray value.

[0031] The bubble content of the bubble-containing silica gel sample is calculated based on the mapped grayscale value of each pixel in the image to be detected and the total number of pixels in the image to be detected.

[0032] Optionally, the initial grayscale value of the pixel in the i-th row and j-th column of the image to be detected is calculated using the following formula:

[0033] a ij =0.299r ij +0.587g ij +0.114b ij ;

[0034] Among them, a ij Let r be the initial grayscale value of the pixel in the i-th row and j-th column of the image to be detected. ij Let g be the red value of the pixel in the i-th row and j-th column of the image to be detected. ij Let b be the green value of the pixel in the i-th row and j-th column of the image to be detected. ij Let be the blue value of the pixel in the i-th row and j-th column of the image to be detected.

[0035] Optionally, the mapped grayscale value of the pixel in the i-th row and j-th column of the image to be detected is calculated using the following formula:

[0036]

[0037] Among them, c ij Let a be the mapped grayscale value of the pixel in the i-th row and j-th column of the image to be detected. ij Let a be the initial grayscale value of the pixel in the i-th row and j-th column of the image to be detected. a ′ vg a is the average grayscale value. M This represents the maximum initial grayscale value in the image to be detected.

[0038] Optionally, the bubble content of the bubble-containing silica gel sample can be calculated using the following formula:

[0039]

[0040] Where α represents the bubble content of the bubble-containing silica gel sample, and c ij Let be the mapped grayscale value of the pixel in the i-th row and j-th column of the image to be detected, and n be the number of rows of pixels in the image to be detected. The number of rows and columns of pixels in the image to be detected are equal.

[0041] To achieve the above objectives, the present invention also provides the following solution:

[0042] A bubble content detection system, comprising:

[0043] The reference image acquisition unit is used to acquire images of bubble-free silica gel samples to obtain reference images.

[0044] A grayscale value calculation unit, connected to the reference image acquisition unit, is used to perform weighted summation of the red, green and blue values ​​of each pixel in the reference image to obtain the grayscale value of each pixel in the reference image.

[0045] An average value calculation unit, connected to the gray value calculation unit, is used to calculate the average gray value based on the gray value of each pixel in the reference image;

[0046] An image acquisition unit is used to acquire an image of the top of a container to obtain an image to be detected; the container contains a sample of silica gel containing air bubbles, and the top and bottom of the container are made of transparent material, with the bottom of the container placed on a black background plate.

[0047] An initial grayscale calculation unit, connected to the image acquisition unit to be detected, is used to perform a weighted summation of the red, green and blue values ​​of any pixel in the image to be detected to obtain the initial grayscale value of the pixel.

[0048] A mapped grayscale calculation unit, connected to the initial grayscale calculation unit and the average value calculation unit, is used to determine the mapped grayscale value of the pixel based on the initial grayscale value of the pixel and the average grayscale value.

[0049] A bubble content calculation unit, connected to the mapping grayscale calculation unit, is used to calculate the bubble content of the bubble-containing silica gel sample based on the mapping grayscale value of each pixel in the image to be detected and the total number of pixels in the image to be detected.

[0050] According to specific embodiments provided by the present invention, the following technical effects are disclosed: A silica gel sample is divided into three portions; the first portion of the silica gel sample is filled into a container and degassed; the second portion of the silica gel sample is stirred to introduce air bubbles, and the stirred second portion is poured into a container; the third portion of the silica gel sample is degassed, and the degassed third portion is poured into a container to obtain a silica gel sample containing air bubbles. The position of the air bubbles can be accurately controlled without damaging the integrity of the silica gel simply by adjusting the position of the second portion of the silica gel sample during the preparation process. Furthermore, since the position of the air bubbles in the silica gel sample containing air bubbles is known, the air bubble content of the silica gel sample can be accurately calculated by acquiring an image of the silica gel sample containing air bubbles, weighting and summing the RGB values ​​of the image, and then combining this with the average grayscale value of the pixels in the image of the silica gel sample without air bubbles. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 This is a flowchart of the method for preparing a bubble-containing silica gel sample according to the present invention;

[0053] Figure 2 This is a schematic diagram of a silica gel sample containing air bubbles.

[0054] Figure 3 This is a schematic diagram of the discharge experimental setup;

[0055] Figure 4 This is a flowchart of the bubble content detection method of the present invention;

[0056] Figure 5 This is a schematic diagram illustrating the principle of image acquisition during the detection of air bubbles in silica gel.

[0057] Figure 6 This is a schematic diagram of the bubble content detection system of the present invention.

[0058] Symbol explanation:

[0059] First silica gel sample - 11, Second silica gel sample - 12, Third silica gel sample - 13, Bubble - 14, Shell - 15, Grounding electrode - 16, Needle electrode - 17, Removable observation window - 18, Insulating sleeve - 19, Microscope - 21, Light source - 22, Black background - 23, Reference image acquisition unit - 31, Gray value calculation unit - 32, Average value calculation unit - 33, Image to be detected acquisition unit - 34, Initial gray value calculation unit - 35, Mapped gray value calculation unit - 36, Bubble content calculation unit - 37. Detailed Implementation

[0060] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0061] The purpose of this invention is to provide a method for preparing a silica gel sample containing air bubbles, a method for detecting air bubble content, and a system. By stirring a second silica gel sample, air bubbles are introduced into the second silica gel sample, so as to prepare a silica gel sample containing air bubbles at a target location without destroying the integrity of the silica gel, and to accurately calculate the air bubble content of the silica gel sample containing air bubbles.

[0062] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0063] Example 1

[0064] like Figure 1 As shown, the method for preparing a bubble-containing silica gel sample provided in this embodiment includes:

[0065] S11: Mix the side-chain hydrogen-containing silicone oil and polymethylvinylsiloxane to obtain a silicone gel sample. Specifically, at room temperature, the two components constituting the silicone gel (side-chain hydrogen-containing silicone oil and polymethylvinylsiloxane) are thoroughly mixed and left to stand for two to three hours, solidifying from a flowable liquid state to a non-flowable gel state to obtain a silicone gel sample.

[0066] S12: Divide the silica gel sample into three portions. For example... Figure 2 The image shows a schematic diagram of a silica gel sample containing air bubbles.

[0067] S13: Fill the first silicone gel sample 11 into a container and degas it.

[0068] S14: Place the container, the second silicone gel sample 12, and the third silicone gel sample 13 in an environment with a set temperature for a set time period. Preferably, the set temperature is 25°C and the set time period is 105 minutes.

[0069] S15: Stir the second silicone gel sample 12 to introduce air bubbles 14 into the second silicone gel sample 12, and pour the stirred second silicone gel sample 12 into the container.

[0070] Since the second silicone gel sample 12 had initially solidified after standing for 105 minutes, its dynamic viscosity was relatively high. At this point, small air bubbles introduced into it would encounter significant frictional resistance and would be difficult to float to the surface on their own. Therefore, the specific location of the air bubble layer could be controlled by pouring the gel in batches. Furthermore, since the first silicone gel sample 11 and the second silicone gel sample 12 still possessed a certain degree of fluidity, there would be no interface between them.

[0071] S16: The third silicone gel sample 13 is degassed, and the degassed third silicone gel sample is poured into the container to obtain a silicone gel sample containing air bubbles. The silicone gel samples containing air bubbles, from bottom to top, are the first silicone gel sample 11, the second silicone gel sample 12 after stirring, and the third silicone gel sample 13 after degasting. The silicone gel sample containing air bubbles is obtained after the three silicone gel samples in the container solidify.

[0072] In one specific implementation, the container is a discharge experimental apparatus. For example... Figure 3 As shown, the discharge experimental device includes a housing 15, a grounding electrode 16, and a needle electrode 17. The housing 15 forms a main cavity inside.

[0073] The top and bottom of the outer casing 15 are made of transparent material. In one specific embodiment, a removable observation window 18, made of transparent glass, is provided at both the top and bottom of the outer casing 15. The silica gel sample is poured into the main cavity through the removable observation window 18.

[0074] The grounding electrode 16 and the needle electrode 17 are located on opposite sides of the outer casing 15. Specifically, one end of the grounding electrode 16 is grounded, and the other end passes through one side of the outer casing 15 into the main cavity. One end of the needle electrode 17 is connected to an external power source, and the other end passes through the side of the outer casing 15 opposite to the grounding electrode 16 into the main cavity.

[0075] The grounding electrode 16 and the needle electrode 17 are used to discharge the bubble-containing silica gel sample. A second silica gel sample 12, after stirring, is located between the grounding electrode 16 and the needle electrode 17. The discharge experimental apparatus allows for the study of localized discharge of bubbles within the organosilicon gel.

[0076] In addition, the discharge experimental apparatus also includes an insulating sleeve 19. The insulating sleeve 19 is located between the grounding electrode 16 and the outer casing 15, and between the needle electrode 17 and the outer casing 15. The insulating sleeve 19 is used to insulate the grounding electrode 16 from the outer casing 15, and to insulate the needle electrode 17 from the outer casing 15.

[0077] Furthermore, the discharge device also includes fastening screws, which securely connect the detachable observation window 18 to the housing 15.

[0078] In this embodiment, the outer casing 15 and the insulating sleeve 19 are both made of polytetrafluoroethylene (PTFE). The fastening screw is made of polyetheretherketone (PEEK). The grounding electrode 16 and the needle electrode 17 are both made of stainless steel.

[0079] The creepage distance on the outside of the discharge experimental device is 235 mm. According to IEC 60664 standard, the discharge experimental device can withstand voltages greater than 50 kV. This invention uses a structure of grounding electrode 16 and needle electrode 17 to form a localized high-field region, preventing direct breakdown of the silica gel sample. Furthermore, it allows control over the location of the discharge, facilitating bubble preparation.

[0080] This invention controls the position and thickness of the bubble-containing silicone gel by controlling the position and thickness of the second silicone gel sample 12. In this embodiment, the center of the bubble layer of the bubble-containing silicone gel is located at the tip of the needle electrode 17, and its thickness is controlled at about 1 cm to facilitate the evaluation of the amount of bubbles.

[0081] Example 2

[0082] This embodiment provides a method for detecting the bubble content of the bubble-containing silica gel sample prepared in Example 1.

[0083] like Figure 4 As shown, the bubble content detection method provided in this embodiment includes:

[0084] S21: Acquire an image of the bubble-free silica gel sample to obtain a reference image. Specifically, the bubble-free silica gel sample is filled into a container identical to the container containing the bubble-containing silica gel sample. Then, an image of the top of the container is taken using a microscope, and a square area at the tip of the needle electrode is cropped to obtain a reference image.

[0085] S22: The red, green, and blue values ​​of each pixel in the reference image are weighted and summed to obtain the grayscale value of each pixel in the reference image. The grayscale values ​​of each pixel in the reference image constitute a first grayscale image matrix.

[0086] S23: Calculate the average gray value based on the gray value of each pixel in the reference image.

[0087] S24: Place the container containing the bubble-containing silica gel sample on a black background and acquire an image of the top of the container to obtain the image to be tested. The top and bottom of the container are made of transparent material. The sides of the container are white. Specifically, a high-resolution image of the top of the container is captured using a microscope with its own light source 22, and a square area at the tip of the needle electrode is cropped to obtain the image to be tested.

[0088] Specifically, such as Figure 5 As shown, when microscope 21 captures an image, the following possibilities exist: 1. Light directly passing through the bubble-containing silica gel sample and shining downwards is absorbed by the black background 23; 2. Light illuminating the bubble-containing silica gel sample undergoes one or more reflections before reaching the microscope 21 head; 3. Light illuminating the white cavity undergoes diffuse reflection, with some light being reflected one or more times by the bubble 14 before reaching the microscope 21 head. Therefore, the light signals captured by microscope 21 when capturing images are all caused by the reflection of the bubble 14, and the amount of bubbles can be estimated using image brightness information.

[0089] S25: For any pixel in the image to be detected, the red, green, and blue values ​​of the pixel are weighted and summed to obtain the initial grayscale value of the pixel. The initial grayscale values ​​of each pixel in the image to be detected constitute a second grayscale image matrix. The value range of the elements in the first and second grayscale image matrices is [0, 255].

[0090] Specifically, the initial grayscale value of the pixel in the i-th row and j-th column of the image to be detected is calculated using the following formula:

[0091] a ij =0.299r ij +0.587g ij +0.114b ij ;

[0092] Among them, a ij Let r be the initial grayscale value of the pixel in the i-th row and j-th column of the image to be detected. ij Let g be the red value of the pixel in the i-th row and j-th column of the image to be detected. ij Let b be the green value of the pixel in the i-th row and j-th column of the image to be detected. ijLet be the blue value of the pixel in the i-th row and j-th column of the image to be detected.

[0093] S26: Determine the mapped gray value of the pixel based on the initial gray value of the pixel and the average gray value.

[0094] Specifically, the mapped grayscale value of the pixel in the i-th row and j-th column of the image to be detected is calculated using the following formula:

[0095]

[0096] Among them, c ij Let a be the mapped grayscale value of the pixel in the i-th row and j-th column of the image to be detected. ij Let a be the initial grayscale value of the pixel in the i-th row and j-th column of the image to be detected. a ′ vg a is the average grayscale value. M This represents the maximum initial grayscale value in the image to be detected.

[0097] The mapped gray values ​​of each pixel in the image to be detected constitute the mapped image matrix. It can be assumed that all non-zero elements in the mapped image matrix are the light intensity reflected by the bubble, and the error that may be introduced due to the instability of the light source is excluded.

[0098] S27: Calculate the bubble content of the bubble-containing silica gel sample based on the mapped grayscale value of each pixel in the image to be detected and the total number of pixels in the image to be detected.

[0099] Specifically, the bubble content of the bubble-containing silica gel sample is calculated using the following formula:

[0100]

[0101] Where α represents the bubble content of the bubble-containing silica gel sample, and c ij Let be the mapped grayscale value of the pixel in the i-th row and j-th column of the image to be detected, and n be the number of rows of pixels in the image to be detected. The number of rows and columns of pixels in the image to be detected are equal.

[0102] Example 3

[0103] In order to implement the method corresponding to Embodiment 2 above and achieve the corresponding functions and technical effects, a bubble content detection system is provided below.

[0104] like Figure 6 As shown, the bubble content detection system provided in this embodiment includes: a reference image acquisition unit 31, a grayscale value calculation unit 32, an average value calculation unit 33, a target image acquisition unit 34, an initial grayscale calculation unit 35, a mapped grayscale calculation unit 36, and a bubble content calculation unit 37.

[0105] The reference image acquisition unit 31 is used to acquire images of bubble-free silica gel samples to obtain reference images.

[0106] The grayscale value calculation unit 32 is connected to the reference image acquisition unit 31. The grayscale value calculation unit 32 is used to perform weighted summation of the red, green and blue values ​​of each pixel in the reference image to obtain the grayscale value of each pixel in the reference image.

[0107] The average value calculation unit 33 is connected to the gray value calculation unit 32. The average value calculation unit 33 is used to calculate the average gray value based on the gray value of each pixel in the reference image.

[0108] The image acquisition unit 34 is used to acquire an image of the top of the container to obtain the image to be detected. The container contains a silica gel sample containing air bubbles, and the top and bottom of the container are made of transparent material, with the bottom of the container placed on a black background plate.

[0109] The initial grayscale calculation unit 35 is connected to the image acquisition unit 34 to be detected. The initial grayscale calculation unit 35 is used to perform a weighted summation of the red, green and blue values ​​of any pixel in the image to be detected to obtain the initial grayscale value of the pixel.

[0110] The mapped grayscale calculation unit 36 ​​is connected to the initial grayscale calculation unit 35 and the average value calculation unit 33. The mapped grayscale calculation unit 36 ​​is used to determine the mapped grayscale value of the pixel based on the initial grayscale value of the pixel and the average grayscale value.

[0111] The bubble content calculation unit 37 is connected to the mapping grayscale calculation unit 36 ​​and is used to calculate the bubble content of the bubble-containing silica gel sample based on the mapping grayscale value of each pixel in the image to be detected and the total number of pixels in the image to be detected.

[0112] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0113] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for preparing a silica gel sample containing air bubbles, characterized in that, The method for preparing the bubble-containing silica gel sample includes: The silica gel sample was divided into three parts; The first silica gel sample was filled into a container and degassed. The second silicone gel sample was stirred to introduce air bubbles, and then the stirred second silicone gel sample was poured into the container. The third silica gel sample was degassed and then poured into the container to obtain a silica gel sample containing air bubbles. The silica gel samples containing air bubbles are, from bottom to top, the first silica gel sample, the second silica gel sample after stirring, and the third silica gel sample after degasing.

2. The method for preparing a bubble-containing silica gel sample according to claim 1, characterized in that, After the step of filling the first silica gel sample into a container and performing degassing treatment, the method for preparing the silica gel sample containing air bubbles further includes: The container, the second silicone gel sample, and the third silicone gel sample were left to stand in an environment with a set temperature for a set period of time.

3. The method for preparing a bubble-containing silica gel sample according to claim 2, characterized in that, The set temperature is 25°C, and the set time period is 105 minutes.

4. The method for preparing a bubble-containing silica gel sample according to claim 1, characterized in that, The container is a discharge experimental device; the discharge experimental device includes a shell, a grounding electrode, and a needle electrode. The top and bottom of the outer shell are made of transparent material; Both the grounding electrode and the needle electrode pass through the side wall of the housing, and the grounding electrode and the needle electrode are arranged opposite to each other; The grounding electrode and the needle electrode are used to discharge the bubble-containing silica gel sample; the second silica gel sample after stirring is located between the grounding electrode and the needle electrode.

5. The method for preparing a bubble-containing silica gel sample according to claim 1, characterized in that, The method for preparing the bubble-containing silica gel sample further includes: Side-chain hydrogen-containing silicone oil and polymethylvinylsiloxane were mixed to obtain a silicone gel sample.

6. A method for detecting bubble content, used to detect the bubble content of a bubble-containing silica gel sample prepared according to any one of claims 1-5, characterized in that, The method for detecting bubble content includes: Images of bubble-free silica gel samples were acquired to obtain reference images; The red, green, and blue values ​​of each pixel in the reference image are weighted and summed to obtain the grayscale value of each pixel in the reference image. Calculate the average gray value based on the gray value of each pixel in the reference image; The bottom of a container holding a sample of silica gel containing air bubbles is placed on a black background, and an image of the top of the container is captured to obtain the image to be tested; the top and bottom of the container are made of transparent material. For any pixel in the image to be detected, the red, green and blue values ​​of the pixel are weighted and summed to obtain the initial gray value of the pixel. The mapped gray value of the pixel is determined based on the initial gray value of the pixel and the average gray value. The bubble content of the bubble-containing silica gel sample is calculated based on the mapped grayscale value of each pixel in the image to be detected and the total number of pixels in the image to be detected.

7. The method for detecting bubble content according to claim 6, characterized in that, The initial grayscale value of the pixel in the i-th row and j-th column of the image to be detected is calculated using the following formula: a ij =0.299r ij +0.587g ij +0.114b ij ; Among them, a ij Let r be the initial grayscale value of the pixel in the i-th row and j-th column of the image to be detected. ij Let g be the red value of the pixel in the i-th row and j-th column of the image to be detected. ij Let b be the green value of the pixel in the i-th row and j-th column of the image to be detected. ij Let be the blue value of the pixel in the i-th row and j-th column of the image to be detected.

8. The method for detecting bubble content according to claim 6, characterized in that, The mapped grayscale value of the pixel in the i-th row and j-th column of the image to be detected is calculated using the following formula: Among them, c ij Let a be the mapped grayscale value of the pixel in the i-th row and j-th column of the image to be detected. ij Let a be the initial grayscale value of the pixel in the i-th row and j-th column of the image to be detected. a ′ vg a is the average grayscale value. M This represents the maximum initial grayscale value in the image to be detected.

9. The method for detecting bubble content according to claim 6, characterized in that, The bubble content of the bubble-containing silica gel sample is calculated using the following formula: Where α represents the bubble content of the bubble-containing silica gel sample, and c ij Let be the mapped grayscale value of the pixel in the i-th row and j-th column of the image to be detected, and n be the number of rows of pixels in the image to be detected. The number of rows and columns of pixels in the image to be detected are equal.

10. A bubble content detection system for detecting the bubble content of a bubble-containing silica gel sample prepared according to any one of claims 1-5, characterized in that, The bubble content detection system includes: The reference image acquisition unit is used to acquire images of bubble-free silica gel samples to obtain reference images. A grayscale value calculation unit, connected to the reference image acquisition unit, is used to perform weighted summation of the red, green and blue values ​​of each pixel in the reference image to obtain the grayscale value of each pixel in the reference image. An average value calculation unit, connected to the gray value calculation unit, is used to calculate the average gray value based on the gray value of each pixel in the reference image; An image acquisition unit is used to acquire an image of the top of a container to obtain an image to be detected; the container contains a sample of silica gel containing air bubbles, and the top and bottom of the container are made of transparent material, with the bottom of the container placed on a black background plate. An initial grayscale calculation unit, connected to the image acquisition unit to be detected, is used to perform a weighted summation of the red, green and blue values ​​of any pixel in the image to be detected to obtain the initial grayscale value of the pixel. A mapped grayscale calculation unit, connected to the initial grayscale calculation unit and the average value calculation unit, is used to determine the mapped grayscale value of the pixel based on the initial grayscale value of the pixel and the average grayscale value. A bubble content calculation unit, connected to the mapping grayscale calculation unit, is used to calculate the bubble content of the bubble-containing silica gel sample based on the mapping grayscale value of each pixel in the image to be detected and the total number of pixels in the image to be detected.

Images