Method and system for detecting interface debonding defect of composite insulator

Abstract

The invention provides a composite insulator interface debonding defect detection method and system.The method comprises the steps that firstly, a laser light source is turned on, and external drag force excitation is applied to a to-be-detected composite insulator; then, after a laser light source is turned on and external drag force excitation is applied to the to-be-detected composite insulator, the to-be-detected composite insulator is shot through a camera, and a speckle image containing a defect deformation area is obtained; and finally, according to the speckle image, performing three-dimensional reconstruction on the defect deformation area of the to-be-detected composite insulator to generate a three-dimensional reconstruction image for evaluating the interface debonding defect of the to-be-detected composite insulator. Therefore, an external force excitation mode is adopted, the debonding area of the to-be-detected composite insulator generates measurable deformation, the interface debonding defect of the to-be-detected composite insulator can be accurately evaluated based on the finally generated three-dimensional reconstruction image, and the recognition effect of the interface debonding defect of the composite insulator is good.

Description

Technical Field

[0001] The present application belongs to the technical field of composite insulators, and in particular relates to a method and system for detecting debonding defects at the interface of a composite insulator. Background Art

[0002] Composite insulators are widely used in power systems due to their excellent hydrophobicity, light weight, and easy installation, protecting equipment and system safety. However, during production, transportation, and long-term operation, composite insulators can develop internal defects due to process flaws, material aging, mechanical stress, or environmental factors such as temperature fluctuations and humidity erosion. Debonding is a particularly critical issue.

[0003] In related technologies, debonding primarily occurs at the interface between the silicone rubber shed sheath and the epoxy core rod of a composite insulator. Causes include forgetting to apply a coupling agent, poor material bonding, improper curing process, external impact, or interface degradation caused by long-term electrical and environmental stress. This defect is difficult to detect through routine visual inspection, but it can significantly reduce the mechanical strength and insulation performance of the insulator, increasing the risk of flashover, partial discharge, and even insulation failure. Especially in adverse weather conditions, such as high humidity or strong electric fields, the debonding area may become an electric field distortion point, accelerating the aging and degradation process, thereby threatening the long-term safe and stable operation of the power system.

[0004] However, there are many types of composite insulators, various types of debonding, and complex shapes. The current defect deformation detection technology has limited effect in detecting debonding of composite insulators, and the debonding defect identification effect is poor. Summary of the Invention

[0005] The embodiments of the present application provide a composite insulator interface debonding defect detection method and system, which can improve the composite insulator interface debonding defect identification effect.

[0006] A first aspect of an embodiment of the present application provides a method for detecting debonding defects at the interface of a composite insulator, which is applied to a control device in a debonding detection system. The debonding detection system includes a laser light source, a transparent sealed test chamber, and a camera. The irradiation direction of the laser light source is toward the transparent sealed test chamber, and the composite insulator to be tested is set in the transparent sealed test chamber. The method includes: turning on the laser light source and applying an external drag force excitation to the composite insulator to be tested; after turning on the laser light source and applying the external drag force excitation to the composite insulator to be tested, photographing the composite insulator to be tested with a camera to obtain a speckle image containing a defective deformation area; and performing three-dimensional reconstruction of the defective deformation area of the composite insulator to be tested based on the speckle image to generate a three-dimensional reconstructed image for evaluating the debonding defect at the interface of the composite insulator to be tested.

[0007] Optionally, in a possible implementation of the first aspect, the disbonding detection system further includes a motor drive device, multiple actuators connected to the motor drive device, and a clamp connected to each actuator, wherein the clamp is clamped on an edge of a shed of the composite insulator to be tested, and applying an external drag force excitation to the composite insulator to be tested includes:

[0008] The operation of each actuator is controlled by a motor-driven device, and each actuator pulls the corresponding fixture to apply an external pulling force to the shed of the composite insulator to be tested.

[0009] Optionally, in another possible implementation of the first aspect, the fixture is lined with a silicone or polyurethane cushion so that the fixture adapts to the shape of the shed of the composite insulator to be tested.

[0010] Optionally, in yet another possible implementation of the first aspect, a rotatable base is further provided below the composite insulator to be tested, and the method further includes:

[0011] Remove the clamps on the edges of the shed of the composite insulator to be tested;

[0012] The composite insulator to be tested is controlled to rotate by rotating the base so that the irradiation direction of the laser light source is updated from a first direction toward the composite insulator to be tested to a second direction toward the composite insulator to be tested;

[0013] Re-clamp each clamp to the edge of the shed of the composite insulator to be tested.

[0014] Optionally, in another possible implementation of the first aspect, photographing the composite insulator to be tested with a camera to obtain a speckle image containing a defective deformation area includes:

[0015] When clear and complete interference fringes appear on the camera, the composite insulator to be tested is photographed to obtain a speckle image.

[0016] Optionally, in a possible implementation of the first aspect, the camera is a digital camera with a charge-coupled device image sensor.

[0017] A second aspect of an embodiment of the present application provides a debonding detection system, including a laser light source, a transparent sealed test chamber, a camera, and a control device. The system includes:

[0018] A laser light source, used for irradiating the composite insulator to be tested in the transparent sealed test box with laser light;

[0019] Transparent sealed test box, used to place the composite insulator to be tested;

[0020] A camera, used for photographing the composite insulator to be tested;

[0021] The control device is used to turn on the laser light source and apply external drag excitation to the composite insulator to be tested. After turning on the laser light source and applying the external drag excitation to the composite insulator to be tested, the composite insulator to be tested is photographed by a camera to obtain a speckle image containing a defective deformation area. Based on the speckle image, the defective deformation area of the composite insulator to be tested is three-dimensionally reconstructed to generate a three-dimensional reconstructed image for evaluating the interface debonding defect of the composite insulator to be tested.

[0022] A third aspect of the embodiments of the present application provides a composite insulator interface debonding defect detection device, which is applied to a control device in a debonding detection system. The debonding detection system includes a laser light source, a transparent sealed test chamber, and a camera. The laser light source is irradiated toward the transparent sealed test chamber. The composite insulator to be tested is placed in the transparent sealed test chamber. The device includes:

[0023] An external force applying module is used to turn on the laser light source and apply external pulling force excitation to the composite insulator to be tested;

[0024] A photographing control unit is used to, after turning on the laser light source and applying an external drag force to the composite insulator to be tested, photograph the composite insulator to be tested through a camera to obtain a speckle image containing a defect deformation area;

[0025] The image generating unit is used to perform three-dimensional reconstruction on the defect deformation area of the composite insulator to be tested based on the speckle image, so as to generate a three-dimensional reconstructed image for evaluating the interface debonding defect of the composite insulator to be tested.

[0026] The fourth aspect of an embodiment of the present application provides a terminal device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the composite insulator interface debonding defect detection method of the first aspect mentioned above is implemented.

[0027] A fifth aspect of an embodiment of the present application provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the composite insulator interface debonding defect detection method of the first aspect mentioned above.

[0028] A sixth aspect of the embodiments of the present application provides a computer program product. When the computer program product is run on a terminal device, the terminal device executes the composite insulator interface debonding defect detection method of the first aspect.

[0029] Compared with the prior art, the embodiments of the present application have the following advantages: the present application provides a method and system for detecting debonding defects at the interface of a composite insulator, wherein the method first turns on a laser light source and applies an external drag force to the composite insulator to be tested; then, after turning on the laser light source and applying the external drag force to the composite insulator to be tested, the composite insulator to be tested is photographed by a camera to obtain a speckle image containing a defective deformation area; finally, based on the speckle image, the defective deformation area of the composite insulator to be tested is three-dimensionally reconstructed to generate a three-dimensional reconstructed image for evaluating debonding defects at the interface of the composite insulator to be tested. Thus, by using an external force excitation method, the debonding area of the composite insulator to be tested produces a measurable deformation, and based on the ultimately generated three-dimensional reconstructed image, the debonding defects at the interface of the composite insulator to be tested can be accurately evaluated, and the identification effect of debonding defects at the interface of the composite insulator is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1 Schematic diagram of a debonding detection system provided in an embodiment of the present application;

[0032] Figure 2 This is a flow chart of a method for detecting debonding defects at the interface of a composite insulator provided in an embodiment of the present application;

[0033] Figure 3 is a schematic diagram of a speckle image provided by an embodiment of the present application;

[0034] Figure 4 is a schematic diagram of a three-dimensional reconstructed image provided by an embodiment of the present application;

[0035] Figure 5 This is a schematic structural diagram of a composite insulator interface debonding defect detection device provided in an embodiment of the present application;

[0036] Figure 6 This is a structural diagram of a terminal device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0038] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0039] It will also be understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0040] As used in this specification and the appended claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0041] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0042] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0043] It should be understood that the size of the serial numbers of each step in this embodiment does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of this application.

[0044] In related technologies, debonding of composite insulators primarily occurs at the interface between the silicone rubber shed sheath and the epoxy core rod. Causes include forgetting to apply a coupling agent, poor material bonding, improper curing process, external impact, or interface degradation caused by long-term electrical and environmental stress. This defect is difficult to detect through routine visual inspection, but it can significantly reduce the mechanical strength and insulation performance of the insulator, increasing the risk of flashover, partial discharge, and even insulation failure. Especially under adverse weather conditions, such as high humidity or strong electric fields, the debonding area may become an electric field distortion point, accelerating the aging and degradation process, thereby threatening the long-term safe and stable operation of the power system.

[0045] Composite insulator debonding detection methods must be simple to operate, safe and effective, and able to be used in harsh engineering environments. Existing detection methods are difficult to meet the required requirements when applied to internal debonding detection of composite insulators. For example, the probe used in the microwave detection method can only meet near-field detection requirements and has limited penetration depth; the ultraviolet detection method has poor imaging capabilities, is not accurate in locating defects, and lacks further characterization of defect characteristics; the ultrasonic detection method uses ultrasonic waves that are easily attenuated in air and require close contact for detection; X-ray detection cannot detect smaller defects and has a low cost-effectiveness ratio, and is generally only suitable for power outage detection. Although these detection technologies are mature and have stable detection results, they are difficult to meet the existing composite insulator debonding detection needs due to the above-mentioned shortcomings.

[0046] In one embodiment, thermal or vacuum excitation can be used to induce deformation in the debonded area, enabling detection of internal anomalies through interferometric imaging. Thermal excitation exploits the difference in thermal expansion coefficients between the debonded area and intact areas to induce deformation, but the effectiveness of this method depends on the thermal response characteristics of the debonded material. Composite insulators typically have low thermal expansion coefficients, and internal debonds are less likely to deform sufficiently after heating, resulting in reduced detection sensitivity. Vacuum excitation relies on the pressure difference between the inside and outside of the debonded area to cause the debonded area to bulge and deform. However, composite insulators have a dense structure, and internal debonds are often not connected to the outside. Under vacuum, the pressure difference is difficult to effectively transmit to closed debonds (such as interlaminar debonds), making debonds difficult to visualize. Furthermore, vacuum excitation has limited effect on deeper debonds, making it unsuitable for detecting complex structures. These debond defect detection methods offer advantages such as high resolution, non-contact detection, and real-time imaging. However, their applicability is limited, particularly for subtle debonds, such as those caused by forgotten coupling agents, making high-precision imaging difficult. In order to improve the detection sensitivity, it is necessary to study more effective excitation methods to enhance the deformation response of the debonding area and thus improve the detection effect.

[0047] In view of this, an embodiment of the present application provides a method and system for detecting debonding defects at the interface of a composite insulator. The method first turns on a laser light source and applies an external drag force to the composite insulator under test. After turning on the laser light source and applying the external drag force to the composite insulator under test, the composite insulator under test is photographed by a camera to obtain a speckle image containing a defective deformation region. Finally, based on the speckle image, the defective deformation region of the composite insulator under test is three-dimensionally reconstructed to generate a three-dimensional reconstructed image for evaluating debonding defects at the interface of the composite insulator under test. Thus, by using an external force excitation method to cause a measurable deformation in the debonding region of the composite insulator under test, the debonding defect at the interface of the composite insulator under test can be accurately assessed based on the resulting three-dimensional reconstructed image, achieving a good identification effect for debonding defects at the interface of the composite insulator under test.

[0048] In order to illustrate the technical solution of the present application, specific embodiments are provided below.

[0049] See also Figure 1 , shows a schematic structural diagram of a debonding detection system provided by an embodiment of the present application. Figure 1 As shown, the debonding detection system includes at least a laser light source, a transparent sealed test box, a camera and a control device (not shown in the figure).

[0050] The laser light source is directed toward the transparent sealed test chamber. During debonding defect detection on composite insulator interfaces, the laser light source is used to illuminate the composite insulator with laser light. The composite insulator is placed within the transparent sealed test chamber, where debonding defect detection is performed. This provides a sealed testing environment for the composite insulator under test, thereby preventing inaccurate and precision test results due to environmental changes during the testing process. A camera is used to photograph the composite insulator under test. A control device is used to control the execution of the composite insulator interface debonding defect detection method and generate a final three-dimensional reconstructed image.

[0051] In one embodiment, the camera is a digital camera with a charge coupled device (CCD) image sensor, which has a resolution of up to 1392*1040 pixels. For the sake of convenience, it is referred to as a CCD camera below. The charge coupled device is a photoelectric sensor that converts light signals into electrical signals and captures images through a pixel array. Figure 1 As shown in the figure, a CCD camera is used in combination with a phase shifter, a shearing device, and an image lens. The phase shifter can change the optical path length by mechanical or optical means to introduce a controllable phase difference. In the detection of interface debonding defects, multiple phase difference images can be generated by phase shifting to resolve the surface deformation or three-dimensional contour of the object, eliminate environmental vibrations or optical system errors, and enhance the signal-to-noise ratio of defect detection. The shearing device can split the incident light beam into two beams and introduce a small lateral offset (shear amount) to form interference fringes. The image lens can focus the light reflected or scattered from the surface of the object onto the target surface of the CCD camera to form a clear image.

[0052] Reference Figure 2 , shows a schematic flow chart of a composite insulator interface debonding defect detection method provided by an embodiment of the present application. Figure 2 As shown, the composite insulator interface debonding defect detection method may include the following steps:

[0053] Step 201: Turn on the laser light source and apply external pulling force to the composite insulator to be tested.

[0054] It should be noted that laser speckle interferometry (LSSI) is a highly sensitive nondestructive testing method that can be used to detect tiny defects within composite insulators. This technique uses laser light to illuminate the insulator surface, record the deformation of the defective area under external force, and generate a speckle pattern.

[0055] In one embodiment, the disbonding detection system further includes a motor drive device, a plurality of actuators connected to the motor drive device, and a clamp connected to each actuator, wherein the clamp is clamped on the edge of the shed of the composite insulator to be tested. Figure 1Multiple force application points were placed around the composite insulator under test within a transparent sealed test chamber. A split-flap fixture (an example of a fixture) was used, clamped to the edge of the composite insulator's shed. Actuators were installed on the inner wall of the transparent sealed test chamber, pulling the fixture to apply external force. A motor-driven mechanism synchronized the actuators, gradually increasing the pulling force. Force sensors provided real-time feedback and adjustments, monitoring the consistency of the force applied at each point.

[0056] In one embodiment, the motor driving device may be a stepper motor controlled by a programmable controller. By controlling the stepper motor through the programmable controller, it is possible to precisely apply external force to the composite insulator.

[0057] In one embodiment, the fixture is lined with a silicone or polyurethane cushion so that the fixture can adapt to the shape of the shed of the composite insulator to be tested.

[0058] In an embodiment of the present application, before the detection of debonding defects at the composite insulator interface begins, the composite insulator to be tested is placed in a transparent sealed test box, and the sheds are clamped with a clamp, with the sheds evenly distributed between the clamps. The test box is closed, the laser light source and the CCD camera are turned on, and the motor drag device is started to synchronize the actuators to apply a uniform pulling force to the composite insulator. Since thermal excitation and vacuum excitation have limited effects in detecting debonding, such as debonding of composite insulators, it is difficult to induce sufficient deformation signals. Therefore, the embodiment of the present application adopts an external force excitation method, in which the edge of the composite insulator shed is clamped by a clamp, and an external force is applied by a motor drive to cause a measurable deformation in the debonding area. This method is suitable for detecting minor debonding and debonding problems without obvious internal air gaps, and improves the detection sensitivity and applicability.

[0059] Step 202 : After turning on the laser light source and applying an external pulling force to the composite insulator to be tested, the composite insulator to be tested is photographed by a camera to obtain a speckle image including a defective deformation area.

[0060] In this embodiment, laser light is used to illuminate the composite insulator under test, and an external drag force is applied to the composite insulator. Under the influence of the external drag force, the location of the debonding in the composite insulator undergoes severe deformation, resulting in changes in the laser speckle interferometry pattern. This change in the speckle pattern can be used to detect internal debonding defects in the composite insulator. This method offers the advantages of high resolution, non-contact, and real-time detection, effectively acquiring information on internal debonding defects in composite insulators.

[0061] It should be noted that as the tension increases, the deformation of the debonding position on the composite insulator will be more obvious than other positions. At this time, the composite insulator to be tested is photographed and recorded by a CCD camera, and a speckle image containing the defective deformation area can be obtained.

[0062] In one embodiment, when clear and complete interference fringes appear on the CCD camera, the composite insulator to be tested is photographed to obtain a speckle image.

[0063] In the embodiment of the present application, in the obtained speckle image, for a normal area without defects, randomly distributed black and white spots will appear; for a debonded area, obvious butterfly-shaped stripes will appear, as shown in FIG. Figure 3 Schematic diagram of speckle image shown.

[0064] Step 203 : performing three-dimensional reconstruction on the defective deformation region of the composite insulator to be tested based on the speckle image to generate a three-dimensional reconstructed image for evaluating the interface debonding defect of the composite insulator to be tested.

[0065] In the embodiment of this application, the speckle image is only the original detection result, which contains complex optical interference information and cannot be directly used for defect assessment. It needs to be processed to extract effective information. Figure 1 The aforementioned debonding detection system may further include a personal computer (PC). After obtaining the speckle image, the speckle image may be exported to the PC for post-processing to obtain a three-dimensional reconstructed image for evaluating the debonding defect at the interface of the composite insulator to be tested, and the test is completed.

[0066] In the embodiment of the present application, the PC has an integrated image processing software. After the speckle image undergoes a series of image processing operations on the PC, a deformed three-dimensional reconstruction result can be obtained, thereby obtaining high-precision information on the deformation of the debonding defect. The three-dimensional reconstruction result can be seen in Figure 4 Schematic diagram of the three-dimensional reconstructed image shown.

[0067] In one embodiment, the control device in the debonding detection system is a PC.

[0068] In one embodiment, a rotatable base is further provided below the composite insulator to be tested. First, the various clamps clamped on the edge of the shed of the composite insulator to be tested are removed; then, by rotating the base, the rotation of the composite insulator to be tested is controlled so that the irradiation direction of the laser light source is updated from the first direction toward the composite insulator to be tested to the second direction toward the composite insulator to be tested; finally, each clamp is re-clamped on the edge of the shed of the composite insulator to be tested. It should be noted that when a scanning test is required on the composite insulator to be tested, the current irradiation direction of the laser light source is recorded as the first direction, and then the clamp is removed first. The base of the insulator can be rotated 360 degrees. When it rotates to the second direction (i.e., the new surface to be tested), the clamp is re-clamped and the experimental steps are repeated. Therefore, for cylindrical composite insulator structures, the debonding detection system has a 360° R-axis scanning capability to ensure that the detection area can be fully covered.

[0069] In the embodiments of the present application, based on the structural characteristics of the composite insulator and according to the actual interface conditions of debonding inside the composite insulator, the speckle image data acquired during the scanning process is batch processed in combination with the optical properties of laser interference. The phase change of the laser speckle interference image can be used to analyze the presence of internal debonding defects, and high-precision three-dimensional imaging of the deformation caused by debonding defects of different sizes and shapes can be achieved. Composite insulators with debonding defects can be accurately screened, which is helpful for analyzing the debonding formation mechanism and the cause of insulation failure.

[0070] The above-mentioned embodiment of the present application discloses a method for detecting debonding defects at the interface of a composite insulator. First, a laser light source is turned on and an external pulling force is applied to the composite insulator to be tested. Then, after turning on the laser light source and applying the external pulling force to the composite insulator to be tested, the composite insulator to be tested is photographed by a camera to obtain a speckle image containing a defective deformation area. Finally, based on the speckle image, the defective deformation area of the composite insulator to be tested is three-dimensionally reconstructed to generate a three-dimensional reconstructed image for evaluating the debonding defect at the interface of the composite insulator to be tested. Thus, by adopting an external force excitation method, the debonding area of the composite insulator to be tested produces a measurable deformation. Based on the finally generated three-dimensional reconstructed image, the debonding defect at the interface of the composite insulator to be tested can be accurately evaluated, and the identification effect of the debonding defect at the interface of the composite insulator is good. The stepper motor can be controlled by a programmable controller to achieve the precise application of external force to the composite insulator. For cylindrical composite insulator structures, the debonding detection system has a 360° R-axis scanning capability to ensure that the detection area can be fully covered.

[0071] Experimental verification has shown that the composite insulator interface debonding defect detection method provided by the embodiment of the present application is capable of detecting tiny debonding defects and can detect deformations at the 3um level, with a single detection time of no more than 10 seconds. Secondly, the embodiment of the present application can perform three-dimensional reconstruction and imaging of the deformation map caused by debonding, making the detection results very intuitive and conducive to analysis by engineering personnel. Finally, combined with the developed image processing software, debonding deformation imaging and positioning can be achieved simultaneously, ensuring the efficiency and effectiveness of the detection method.

[0072] See also Figure 5 , shows a structural schematic diagram of a composite insulator interface debonding defect detection device provided in an embodiment of the present application. For the sake of convenience, only the parts related to the embodiment of the present application are shown.

[0073] The composite insulator interface debonding defect detection device may specifically include the following modules:

[0074] The external force applying module 501 is used to turn on the laser light source and apply an external pulling force to the composite insulator to be tested.

[0075] The shooting control unit 502 is used to turn on the laser light source and apply external drag excitation to the composite insulator to be tested, and then shoot the composite insulator to be tested through a camera to obtain a speckle image containing a defect deformation area.

[0076] The image generating unit 503 is configured to perform three-dimensional reconstruction on the defective deformation region of the composite insulator to be tested based on the speckle image, so as to generate a three-dimensional reconstructed image for evaluating the interface debonding defect of the composite insulator to be tested.

[0077] The composite insulator interface debonding defect detection device disclosed in the above-mentioned embodiment of the present application first turns on a laser light source and applies an external drag force to the composite insulator to be tested. Then, after turning on the laser light source and applying the external drag force to the composite insulator to be tested, the composite insulator to be tested is photographed by a camera to obtain a speckle image containing a defective deformation area. Finally, based on the speckle image, the defective deformation area of the composite insulator to be tested is three-dimensionally reconstructed to generate a three-dimensional reconstructed image for evaluating the composite insulator interface debonding defect to be tested. Thus, by using an external force excitation method, the debonding area of the composite insulator to be tested produces a measurable deformation. Based on the ultimately generated three-dimensional reconstructed image, the composite insulator interface debonding defect to be tested can be accurately assessed, and the composite insulator interface debonding defect identification effect is good.

[0078] Furthermore, in a possible implementation of the embodiment of the present application, the external force applying module 501 may specifically include the following units:

[0079] The first control unit is used to control the operation of each actuator through a motor driving device, and each actuator pulls a corresponding clamp to apply an external pulling force to the shed of the composite insulator to be tested.

[0080] Furthermore, in another possible implementation of the embodiment of the present application, the fixture is lined with a silicone or polyurethane cushion so that the fixture can adapt to the shape of the shed of the composite insulator to be tested.

[0081] Furthermore, in another possible implementation of the embodiment of the present application, the composite insulator interface debonding defect detection device may further include the following modules:

[0082] The second control unit is used to remove the various clamps clamped on the edges of the shed of the composite insulator to be tested.

[0083] The third control unit is used to control the rotation of the composite insulator to be tested by rotating the base, so that the irradiation direction of the laser light source is updated from a first direction toward the composite insulator to be tested to a second direction toward the composite insulator to be tested.

[0084] The fourth control unit is used to re-clamp each clamp on the edge of the shed of the composite insulator to be tested.

[0085] Furthermore, in another possible implementation of the embodiment of the present application, the shooting control unit 502 may specifically include the following units:

[0086] The first shooting unit is used to shoot the composite insulator to be tested to obtain a speckle image when clear and complete interference fringes appear on the camera.

[0087] Furthermore, in a possible implementation of the embodiment of the present application, the camera is a digital camera with a charge-coupled device image sensor.

[0088] The composite insulator interface debonding defect detection device disclosed in the aforementioned embodiments of this application utilizes external force excitation to induce measurable deformation in the debonding region of the composite insulator under test. The resulting three-dimensional reconstructed image accurately assesses debonding defects in the composite insulator under test, achieving excellent results in identifying debonding defects. A programmable controller controls a stepper motor to precisely apply external force to the composite insulator. For cylindrical composite insulator structures, the debonding detection system features 360° R-axis scanning capability, ensuring comprehensive coverage of the inspection area.

[0089] The composite insulator interface debonding defect detection device provided in the embodiment of the present application can be applied to the aforementioned method embodiment. For details, please refer to the description of the aforementioned method embodiment, which will not be repeated here.

[0090] Figure 6 This is a schematic diagram of the structure of the terminal device provided in the embodiment of the present application. Figure 6 As shown, the terminal device 600 of this embodiment includes: at least one processor 610 ( Figure 6 Only one processor is shown in the figure), a memory 620, and a computer program 621 stored in the memory 620 and executable on the at least one processor 610. When the processor 610 executes the computer program 621, the steps in the embodiment of the above-mentioned composite insulator interface debonding defect detection method are implemented.

[0091] The terminal device 600 may be a computing device such as a desktop computer, a notebook, a PDA, or a cloud server. The terminal device may include, but is not limited to, a processor 610 and a memory 620. Those skilled in the art will appreciate that Figure 6 This is merely an example of the terminal device 600 and does not constitute a limitation on the terminal device 600 . The terminal device 600 may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the terminal device 600 may also include input and output devices, network access devices, etc.

[0092] The processor 610 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. A general-purpose processor may be a microprocessor or any conventional processor.

[0093] In some embodiments, the memory 620 may be an internal storage unit of the terminal device 600, such as a hard disk or memory of the terminal device 600. In other embodiments, the memory 620 may also be an external storage device of the terminal device 600, such as a plug-in hard disk equipped on the terminal device 600, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card, etc. Furthermore, the memory 620 may also include both an internal storage unit of the terminal device 600 and an external storage device. The memory 620 is used to store an operating system, application programs, a boot loader (BootLoader), data, and other programs, such as the program code of the computer program. The memory 620 may also be used to temporarily store data that has been output or is about to be output.

[0094] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0095] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0096] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0097] In the embodiments provided in this application, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are merely illustrative. For example, the division of the modules or units is merely a logical function division. In actual implementation, there may be other division methods, such as 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0098] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0099] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0100] If the integrated module / 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 this understanding, the present application implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by the processor, it can implement the steps of the above-mentioned various method embodiments. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0101] The present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed through a computer program product. When the computer program product is run on a terminal device, the terminal device can implement the steps in the above-mentioned method embodiments when executing.

[0102] The above embodiments are intended only to illustrate the technical solutions of the present application and are not intended to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the above embodiments or replace some of the technical features therein with equivalents; and such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present application and should be included within the scope of protection of the present application.

Claims

1. A method for detecting debonding defects at the interface of a composite insulator, characterized in that: A control device is used in a disbonding detection system, wherein the disbonding detection system includes a laser light source, a transparent sealed test chamber, and a camera, wherein the laser light source is directed toward the transparent sealed test chamber, and a composite insulator to be tested is disposed in the transparent sealed test chamber. The method includes: Turning on the laser light source and applying an external drag force to the composite insulator to be tested; After turning on the laser light source and applying an external drag force to the composite insulator to be tested, photographing the composite insulator to be tested by the camera to obtain a speckle image including a defective deformation area; The defective deformation region of the composite insulator to be tested is three-dimensionally reconstructed according to the speckle image to generate a three-dimensional reconstructed image for evaluating the interface debonding defect of the composite insulator to be tested.

2. The method according to claim 1, characterized in that The debonding detection system further includes a motor drive device, a plurality of actuators connected to the motor drive device, and a clamp connected to each actuator, wherein the clamp is clamped on the edge of the shed of the composite insulator to be tested, and applying an external pulling force excitation to the composite insulator to be tested includes: The operation of each actuator is controlled by the motor driving device, and each actuator pulls the corresponding clamp to apply an external pulling force to the shed of the composite insulator to be tested.

3. The method according to claim 2, characterized in that The fixture is lined with a silicone or polyurethane cushion so that the fixture can adapt to the shape of the shed of the composite insulator to be tested.

4. The method according to claim 2, characterized in that A rotatable base is further provided below the composite insulator to be tested, and the method further comprises: Remove the clamps clamped on the edges of the shed of the composite insulator to be tested; By rotating the base, the composite insulator to be tested is controlled to rotate, so that the irradiation direction of the laser light source is updated from a first direction toward the composite insulator to be tested to a second direction toward the composite insulator to be tested; Re-clamp each of the clamps on the edge of the shed of the composite insulator to be tested.

5. The method according to claim 1, characterized in that The step of photographing the composite insulator to be tested by the camera to obtain a speckle image containing a defective deformation area includes: When clear and complete interference fringes appear on the camera, the composite insulator to be tested is photographed to obtain the speckle image.

6. The method according to any one of claims 1 to 5, characterized in that The camera is a digital camera with a charge coupled device image sensor.

7. A debonding detection system, characterized in that: The system includes a laser light source, a transparent sealed test chamber, a camera and a control device, and includes: The laser light source is used to irradiate the composite insulator to be tested in the transparent sealed test box with laser light; The transparent sealed test box is used to place the composite insulator to be tested; The camera is used to photograph the composite insulator to be tested; The control device is configured to turn on the laser light source and apply an external drag force excitation to the composite insulator to be tested. After turning on the laser light source and applying the external drag force excitation to the composite insulator to be tested, the composite insulator to be tested is photographed by the camera to obtain a speckle image including a defective deformation area. Based on the speckle image, the defective deformation area of the composite insulator to be tested is three-dimensionally reconstructed to generate a three-dimensional reconstructed image for evaluating an interface debonding defect of the composite insulator to be tested.

8. The system according to claim 7, characterized in that The debonding detection system further includes a motor drive device, a plurality of actuators connected to the motor drive device, and a clamp connected to each actuator, wherein the clamp is clamped on the edge of the shed of the composite insulator to be tested; The motor driving device is used to control the operation of each of the actuators, and each of the actuators pulls the corresponding clamp to apply an external pulling force to the shed of the composite insulator to be tested.

9. A composite insulator interface debonding defect detection device, characterized in that: A control device used in a disbonding detection system, the disbonding detection system comprising a laser light source, a transparent sealed test chamber, and a camera, wherein the laser light source is directed toward the transparent sealed test chamber, and the composite insulator to be tested is disposed in the transparent sealed test chamber. The device comprises: An external force applying module, used for turning on the laser light source and applying an external pulling force excitation to the composite insulator to be tested; a photographing control unit, configured to, after turning on the laser light source and applying an external drag force excitation to the composite insulator to be tested, photograph the composite insulator to be tested by the camera to obtain a speckle image including a defective deformation area; An image generating unit is configured to perform three-dimensional reconstruction on the defective deformation region of the composite insulator to be tested based on the speckle image, so as to generate a three-dimensional reconstructed image for evaluating the interface debonding defect of the composite insulator to be tested.

10. A terminal device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method according to any one of claims 1 to 6 is implemented.

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