Porcelain bushing imaging system and porcelain bushing imaging method based on diffraction full focusing

Abstract

The invention provides a porcelain bushing imaging system and porcelain bushing imaging method based on diffraction full focusing, and the system comprises an ultrasonic transmitting array which is at least used for transmitting an ultrasonic signal to a cable porcelain bushing; the ultrasonic receiving array is used for receiving diffraction signals after the ultrasonic signals are influenced by the end corners and the end points of the cable porcelain sleeve; and the processor, the ultrasonic transmitting array and the ultrasonic receiving array are in communication connection and are used for constructing a three-dimensional image of the cable porcelain sleeve according to the ultrasonic signal and the diffraction signal through a diffraction full-focusing imaging algorithm to obtain a target image. By receiving diffraction signals from multiple angles, capturing subtle changes caused by defects and adopting a diffraction full-focusing imaging algorithm, it is ensured that a clear imaging result of a deep area of the cable porcelain bushing is obtained, ultrasonic signals are processed in real time, a high-resolution three-dimensional image is generated, and the problem that when complex defects exist, the imaging result of the deep area of the cable porcelain bushing cannot be obtained is solved. And the detection result is inaccurate due to insufficient imaging depth.

Description

Technical Field

[0001] The present invention relates to the field of ultrasonic detection technology, and in particular to a porcelain sleeve imaging system based on diffraction total focusing, a porcelain sleeve imaging method based on diffraction total focusing, and a computer-readable storage medium. Background Art

[0002] The cable terminal porcelain sleeve is a crucial insulating component in high-voltage power cables. Its main function is to ensure the safety and stable operation of the cable. The porcelain sleeve not only needs to withstand the effects of high-voltage electric fields, but also needs to cope with various adverse factors in the external environment. As the power system's requirements for cable safety increase, the porcelain sleeve, as a core component of the cable terminal, plays a key role in preventing cable breakdown, short circuits and other accidents.

[0003] However, during long-term operation, the porcelain sleeve may crack or break due to various factors, or even produce defects such as holes due to improper manufacturing process. These defects directly affect the insulation performance of the porcelain sleeve, causing the electrical strength of the porcelain sleeve to decrease, thereby increasing the risk of power cable failure. In some extreme cases, damage to the porcelain sleeve may lead to uneven distribution of the electric field, especially in the area around the porcelain sleeve, which may cause local abnormal temperature rise. Long-term overheating not only aggravates the aging of the porcelain sleeve itself, but may also further affect other insulating materials of the cable, causing the overall performance of the cable to decline, and even causing serious electrical failures.

[0004] In the prior art, a nondestructive testing technology called creeping wave detection is often used to detect potential threats to cable safety. However, although the creeping wave detection method shows good results in surface and near-surface defect detection, the signal attenuation phenomenon becomes more and more significant as the signal transmission depth increases. Signal attenuation not only affects the imaging quality, but also often produces certain errors when measuring the depth and horizontal position of deep defects. Especially when facing large-scale or multi-level defects in porcelain sleeves, the detection ability of the traditional creeping wave detection method is relatively insufficient. Summary of the invention

[0005] The main purpose of the present application is to provide a porcelain sleeve imaging system, method and computer-readable storage medium based on diffraction total focusing, so as to at least solve the problem of inaccurate detection results for complex defect areas in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a porcelain sleeve imaging system based on diffraction total focusing is provided, and the system includes: an ultrasonic transmitting array, at least for transmitting ultrasonic signals to the cable porcelain sleeve; an ultrasonic receiving array, for receiving diffraction signals of the ultrasonic signals after being affected by the end angles and end points of the cable porcelain sleeve; a processor, which is communicatively connected to the ultrasonic transmitting array and the ultrasonic receiving array, and is used to construct a three-dimensional image of the cable porcelain sleeve according to the ultrasonic signal and the diffraction signal through a diffraction total focusing imaging algorithm to obtain a target image.

[0007] Optionally, the ultrasonic transmitting array is installed between the terminal of the cable porcelain sleeve and the first shed, and the ultrasonic receiving array is installed between the flange of the cable porcelain sleeve and the last shed.

[0008] Optionally, the ultrasonic transmitting array and the ultrasonic receiving array are installed in parallel.

[0009] According to another aspect of the present application, a porcelain sleeve imaging method based on diffraction total focusing is provided, and the porcelain sleeve imaging method is applied to the porcelain sleeve imaging system of the first aspect of the present application, and the porcelain sleeve imaging method comprises: controlling the ultrasonic transmitting array to transmit ultrasonic signals to the cable porcelain sleeve, and controlling the ultrasonic transmitting array and / or the ultrasonic receiving array to receive, so as to obtain multiple target signals; processing the multiple target signals by a diffraction total focusing imaging algorithm, and imaging according to the processed target signals to obtain a target image.

[0010] Optionally, the ultrasonic transmitting array and / or the ultrasonic receiving array are controlled to receive and obtain multiple target signals, including: taking the ultrasonic transmitting array and the ultrasonic receiving array as a target array with a center gap being the installation distance between the ultrasonic transmitting array and the ultrasonic receiving array, receiving the backscattered signal of the ultrasonic signal through the target array, and processing it through a total focusing algorithm to extract the pulse echo of the backscattered signal to obtain a first target signal; receiving the diffraction signal of the ultrasonic signal through the ultrasonic receiving array, and processing it through a total focusing algorithm to extract the pitch-catch echo of the diffraction signal to obtain a second target signal.

[0011] Optionally, receiving the backscattered signal of the ultrasonic signal by the target array and processing it by a total focusing algorithm to extract the pulse echo of the backscattered signal to obtain a first target signal includes: operating the backscattered signal based on a first preset formula to obtain the first target signal:

[0012] Wherein, r1(t) is the first target signal, σ is the reflection coefficient of the backscattered signal, and w(t m ) is the directivity function of the backscattered signal, a(t) is the envelope of the backscattered signal, R(t) is the distance of the backscattered signal, c is the speed of sound, f c is the carrier frequency of the backscattered signal, and k is the beam of the backscattered signal.

[0013] Optionally, receiving the diffraction signal of the ultrasonic signal by the ultrasonic receiving array and processing it by a total focusing algorithm to extract the pitch-catch echo of the diffraction signal to obtain a second target signal includes: operating the diffraction signal based on a second preset formula to obtain the second target signal:

[0014] Wherein, r2(t) is the second target signal, σ′ is the reflection coefficient of the diffraction signal, and w′(t m ) is the directivity function of the diffraction signal, a′(t) is the envelope of the diffraction signal, R′(t) is the distance of the diffraction signal, and f c ' is the carrier frequency of the diffraction signal, and k' is the beam of the diffraction signal.

[0015] Optionally, the multiple target signals are processed by a diffraction total focusing imaging algorithm, including: superimposing the first target signal and the second target signal to obtain a third target signal: R(t)=r1(t)+r2(t); wherein R(t) is the third target signal.

[0016] Optionally, imaging is performed according to the processed target signal to obtain a target image, including: constructing an alternative contour image of the cable porcelain sleeve, and arbitrarily selecting a point in the alternative contour image as a virtual focal point; dividing the alternative contour image into a plurality of pixel points based on the virtual focal point; calculating the sound pressure amplitude corresponding to each pixel point according to the third target signal to obtain a target sound pressure amplitude; normalizing the target sound pressure amplitude, and imaging according to the normalized target sound pressure amplitude to obtain the target image.

[0017] According to another aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute any one of the methods described in the second aspect of the present application.

[0018] The technical solution of the present application is applied, and an ultrasonic transmitting array is used to transmit ultrasonic signals to the cable porcelain sleeve at least; an ultrasonic receiving array is used to receive diffraction signals of ultrasonic signals after being affected by the end angles and endpoints of the cable porcelain sleeve; a processor, an ultrasonic transmitting array and the ultrasonic receiving array are connected in communication, and are used to construct a three-dimensional image of the cable porcelain sleeve according to the ultrasonic signal and the diffraction signal through a diffraction full-focus imaging algorithm to obtain a target image. By receiving diffraction signals at multiple angles, subtle changes caused by defects are captured, and a diffraction full-focus imaging algorithm is used to ensure that clear imaging results of the deep area of ​​the cable porcelain sleeve are obtained, ultrasonic signals are processed in real time, and high-resolution three-dimensional images are generated, which solves the problem of inaccurate detection results due to insufficient imaging depth when facing complex defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A structural block diagram of a porcelain sleeve imaging system based on diffraction total focusing according to an embodiment of the present application is shown;

[0020] Figure 2 A flow chart of a ceramic sleeve imaging method based on diffraction total focusing according to an embodiment of the present application is shown.

[0021] The above drawings include the following reference numerals:

[0022] 201, ultrasonic transmitting array; 202, ultrasonic receiving array; 203, processor. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] As introduced in the background technology, in the prior art, when faced with large-scale or multi-level defects in porcelain sleeves, the detection capability of the traditional creeping wave detection method is relatively insufficient. In order to solve the problem of inaccurate detection results for complex defect areas in the prior art, the embodiments of the present application provide a porcelain sleeve imaging system, method and computer-readable storage medium based on diffraction total focusing.

[0027] Figure 1 is a structural block diagram of a ceramic sleeve imaging system based on diffraction total focusing according to an embodiment of the present application. Figure 1 As shown, the system includes:

[0028] The ultrasonic transmitting array 201 is at least used to transmit ultrasonic signals to the cable porcelain sleeve.

[0029] Specifically, the ultrasonic transmitting array in this system is composed of multiple transducers, which are arranged in an array and can transmit ultrasonic signals to the cable porcelain sleeve simultaneously or sequentially. Different from the traditional single-probe transmission method, the ultrasonic transmitting array can provide multi-angle and multi-directional signal transmission, thereby enhancing the signal propagation range and coverage area. Each transducer can independently control the transmission frequency, angle and timing to achieve flexible adjustment in different cable porcelain sleeve detection scenarios.

[0030] By using an ultrasonic emission array, this system can greatly improve the uniformity and coverage of signal emission, and reduce the risk of missed detection and false detection compared to traditional single-probe detection. Multi-angle signal emission enables every part of the cable porcelain sleeve to be fully detected by ultrasonic waves, improving the detection capability and sensitivity of the system and being able to adapt to complex cable porcelain sleeve shapes.

[0031] The ultrasonic receiving array 202 is used to receive the diffraction signal of the ultrasonic signal after being affected by the end angle and end point of the cable porcelain sleeve.

[0032] Specifically, the function of the ultrasonic receiving array is to receive ultrasonic signals generated by diffraction at the end angles and endpoints of the cable porcelain sleeve. When these signals pass through the porcelain sleeve, they are affected by the internal structure, defects (such as cracks, holes, etc.) and edges of the porcelain sleeve, causing the signals to diffract and reflect. The receiving array can receive these reflected and diffracted signals in multiple directions and angles, thereby providing more comprehensive detection information.

[0033] Furthermore, compared with the traditional single-channel receiving method, the ultrasonic receiving array can simultaneously receive diffraction signals at different angles and directions, which not only improves the quality of the received signal, but also increases the detection depth and sensitivity of the system. The multi-angle design of the receiving array makes the signal acquisition more comprehensive, effectively reducing the omissions that may occur in the traditional detection method in the detection of complex defects or deep defects.

[0034] The processor 203 is connected to the ultrasonic transmitting array and the ultrasonic receiving array for constructing a three-dimensional image of the cable porcelain sleeve according to the ultrasonic signal and the diffraction signal through a diffraction total focusing imaging algorithm to obtain a target image.

[0035] Specifically, the processor communicates data with the ultrasonic transmitting array and the receiving array, and uses the diffraction total focusing imaging algorithm to generate a three-dimensional image of the cable porcelain sleeve based on the received ultrasonic signal and diffraction signal. The diffraction total focusing imaging algorithm can accurately reconstruct the structure of the cable porcelain sleeve by inverting the signal in the time domain, and display the depth, location, size, shape and other information of the internal defects. The processor can also calculate and generate the target image in real time for the operator to conduct further analysis.

[0036] Furthermore, by using an efficient processor and full-focus imaging algorithm, the system can provide high-resolution three-dimensional images that accurately reflect the internal structure and defects of the porcelain sleeve. It can achieve real-time imaging and data analysis, greatly improving the detection efficiency and accuracy. Especially in the identification of deep defects, the processor can effectively reduce the problem of image quality degradation caused by signal attenuation in traditional methods.

[0037] Through this embodiment, the ultrasonic transmitting array provides a wider signal coverage, and can transmit ultrasonic signals from multiple angles, which improves the uniformity and comprehensiveness of signal propagation and ensures that every part of the cable porcelain sleeve is detected. The ultrasonic receiving array can effectively capture the subtle changes caused by defects by receiving diffraction signals from multiple angles, and enhances the detection capability of complex defects. The use of the diffraction full-focus imaging algorithm can overcome the problem of signal attenuation in deep defect detection in traditional methods, ensuring that clear imaging results can be obtained even in the deep area of ​​the cable porcelain sleeve, greatly improving the detection accuracy of deep defects. A large number of ultrasonic signals are processed in real time, and high-resolution three-dimensional images are quickly generated to ensure that defect detection is not affected by calculation delays, thereby improving the work efficiency and real-time performance of the entire system. The three-dimensional image can fully display the defects inside the porcelain sleeve, provide information such as the specific location, shape, size, etc. of the defects, and help operators make more accurate judgments, solving the problem of inaccurate detection results due to insufficient imaging depth in the existing technology when facing complex defects.

[0038] As a possible implementation, the ultrasonic transmitting array is installed between the terminal of the cable porcelain sleeve and the first shed, and the ultrasonic receiving array is installed between the flange of the cable porcelain sleeve and the last shed.

[0039] Specifically, the design of installing the ultrasonic transmitting array between the terminal and the shed helps to optimize the emission angle and propagation path of the ultrasonic signal. This position arrangement can ensure that the ultrasonic signal can evenly cover different parts of the porcelain sleeve, enhance the signal's penetration and propagation distance, and especially improve the signal's accessibility and effectiveness in complex structural areas. This installation position can effectively avoid blind spots caused by signal aggregation or scattering, thereby improving the coverage and accuracy of detection.

[0040] As a possible implementation manner, the ultrasonic transmitting array and the ultrasonic receiving array are installed in parallel.

[0041] Specifically, the design of installing the ultrasonic transmitting array and the receiving array in parallel helps to improve the coordination between signal transmission and reception. The parallel arrangement allows the transmitting signal to match the receiving signal more accurately, thereby ensuring the consistency of the signal propagation path and receiving direction. This layout can reduce signal loss or error caused by asymmetric installation and optimize the accuracy of the detection process. At the same time, the parallel installation design helps to improve the signal detection accuracy of the system, so that the signal reflection and diffraction information can be more clearly transmitted to the receiving array, thereby obtaining higher quality imaging results.

[0042] Figure 2 FIG. 1 is a flow chart of a ceramic sleeve imaging method based on diffraction total focusing according to an embodiment of the present application. Figure 2 As shown, the steps of this method are as follows:

[0043] Step S301, controlling the ultrasonic transmitting array to transmit ultrasonic signals to the cable porcelain sleeve, and controlling the ultrasonic transmitting array and / or the ultrasonic receiving array to receive, to obtain multiple target signals.

[0044] Specifically, the system controls the ultrasonic transmitting array to transmit ultrasonic signals to the cable porcelain sleeve. The signal will propagate through the porcelain sleeve, and after interacting with the inside and surface of the porcelain sleeve, it will return and be received by the ultrasonic receiving array. The collaborative work of the transmitting array and the receiving array ensures that the entire process of signal propagation inside and on the surface of the porcelain sleeve is monitored. The target signal refers to the sound wave signal reflected back from the porcelain sleeve, which contains information about various defects in the porcelain sleeve, such as cracks, holes, etc.

[0045] Furthermore, by controlling the coordinated work of the ultrasonic transmitting array and the receiving array, all-round detection of all parts of the cable porcelain sleeve can be achieved, ensuring that more reflected signals are captured, especially when there are defects inside and on the surface of the porcelain sleeve. The acquisition of multiple target signals can provide more information for subsequent image processing, thereby improving the accuracy and detail precision of the imaging results. At the same time, the operation of the control array ensures the flexibility and adaptability of the system in different areas and under different conditions, and can effectively cope with the complexity of the porcelain sleeve structure.

[0046] Step S302: Process multiple target signals using a diffraction total focusing imaging algorithm, and perform imaging based on the processed target signals to obtain a target image.

[0047] Specifically, multiple target signals are processed using a diffraction total focusing imaging algorithm. The diffraction total focusing algorithm is an imaging technology based on wave theory. It calculates the diffraction phenomenon that occurs when sound waves pass through the cable porcelain sleeve, and combines the propagation path and reflection path of the sound waves to obtain the precise location, size, shape and direction of the internal and surface defects of the porcelain sleeve. The processed target signal will generate a target image, usually a three-dimensional image or a two-dimensional image of the porcelain sleeve.

[0048] Furthermore, the diffraction full-focusing imaging algorithm can effectively process multiple target signals, breaking through the limitations of traditional imaging technology, especially in deep defect detection. The algorithm can generate high-resolution three-dimensional images by processing comprehensive diffraction signals, providing detailed information on internal and surface defects of the porcelain sleeve. Compared with conventional imaging methods, the diffraction full-focusing algorithm can not only accurately locate defects, but also provide more image details and deep information, thereby improving the accuracy and reliability of defect detection.

[0049] Therefore, in the embodiment of the present application, by controlling the coordinated work of the ultrasonic transmitting array and the receiving array, the system can receive the reflected signals on the surface and inside of the cable porcelain sleeve in all directions, thereby ensuring the acquisition of multiple target signals. These signals can provide detailed information on each part of the porcelain sleeve and provide sufficient data support for subsequent image generation. The use of the diffraction full-focus imaging algorithm to process multiple target signals effectively breaks through the shortcomings of traditional imaging technology in deep defect detection. The algorithm can accurately identify various defects in the porcelain sleeve, including deep defects, surface defects, etc., and generate high-resolution target images to help inspectors more clearly identify the location, shape, size and direction of the defects. It can construct accurate three-dimensional images or two-dimensional images based on multiple target signals to provide more detailed and clear porcelain sleeve status information. Compared with the traditional single signal detection method, the diffraction full-focus imaging algorithm performs better in image processing and signal integration, can reduce signal interference, improve imaging quality, and reduce the possibility of missed detection or false detection. The imaging method can flexibly cope with various complex structures and working conditions of the cable porcelain sleeve, and adapt to different detection needs by adjusting the operation mode of the ultrasonic transmitting array and the receiving array in real time. Whether deep or surface defects need to be detected in actual applications, stable and efficient imaging performance can be maintained.

[0050] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the method of controlling the ultrasonic transmitting array and / or the ultrasonic receiving array of the present application to receive and obtain multiple target signals will be described in detail below in combination with specific embodiments, including the following steps:

[0051] Step S401, the ultrasonic transmitting array and the ultrasonic receiving array are used as a target array with a center gap being the installation distance between the ultrasonic transmitting array and the ultrasonic receiving array, the backscattered signal of the ultrasonic signal is received by the target array, and is processed by a full focusing algorithm to extract the pulse echo of the backscattered signal to obtain a first target signal.

[0052] Specifically, the ultrasonic transmitting array and the ultrasonic receiving array are designed as an array system, and the center gap of the array is equal to the installation distance between the transmitting array and the receiving array. Through this array structure, the system can simultaneously capture the backscattered signal of the ultrasonic signal. The backscattered signal is a signal reflected from the surface of the cable porcelain sleeve, which can provide information about surface defects (such as cracks, holes, etc.). By processing the backscattered signal through the full focusing algorithm, the pulse echo can be effectively extracted to obtain an accurate first target signal. The target array structure with a center gap equal to the installation distance between the transmitting array and the receiving array can better collect and analyze ultrasonic signals. By receiving the backscattered signal, the defect information on the surface and near the surface of the porcelain sleeve can be accurately captured, which improves the system's ability to detect surface defects. The application of the full focusing algorithm further improves the signal extraction accuracy and ensures the clarity and reliability of the first target signal.

[0053] Step S402: receiving the diffraction signal of the ultrasonic signal through an ultrasonic receiving array, and processing it through a full focusing algorithm to extract the pitch-catch echo of the diffraction signal to obtain a second target signal.

[0054] Specifically, the ultrasonic receiving array receives the diffraction signal generated by the ultrasonic signal passing through the cable porcelain sleeve. The diffraction signal is caused by the wave effect of defects (such as cracks, holes, etc.) in the cable porcelain sleeve. These diffraction signals contain important information about the depth, shape, and location of the defects. The diffraction signal is processed by the full focusing algorithm to extract the pitch-catch echo, which helps to generate more accurate target signals and further improve the quality of defect imaging.

[0055] Furthermore, by processing the diffraction signal, information about deep defects in the porcelain sleeve can be obtained. Diffraction signals can usually reflect deep defects or defects of complex shapes, which is an important supplement to traditional surface defect detection methods. By extracting pitch-catch echoes through the full focusing algorithm, the signal quality can be enhanced, signal attenuation or interference can be avoided, and the system's ability to detect deep defects in the porcelain sleeve can be further improved.

[0056] Therefore, in the embodiment of the present application, by processing the backscattered signal and the diffraction signal of the ultrasonic signal, combined with the full focusing algorithm, the accuracy and comprehensiveness of the cable porcelain sleeve defect detection are significantly improved. By adopting the detection method combining the backscattered signal and the diffraction signal, combined with the full focusing algorithm, the accuracy, depth and comprehensiveness of the cable porcelain sleeve defect detection are significantly improved, and various deep and surface defects can be effectively identified, especially in complex environments and application scenarios with high precision requirements.

[0057] As a possible implementation method, in the embodiment of the present application, the backscattered signal of the ultrasonic signal is received by the target array, and processed by the full focusing algorithm to extract the pulse echo of the backscattered signal to obtain the first target signal, including:

[0058] The backscattered signal is calculated based on the first preset formula (Formula 1) to obtain the first target signal:

[0059]

[0060] Where r1(t) is the first target signal, σ is the reflection coefficient of the backscattered signal, and w(t m ) is the directivity function of the backscatter signal, a(t) is the envelope of the backscatter signal, R(t) is the distance of the backscatter signal, c is the speed of sound, and f c is the carrier frequency of the backscattered signal, and k is the beam of the backscattered signal.

[0061] Specifically, the accuracy of backscatter signal processing is improved through the full focusing algorithm, making the extraction of pulse echo clearer and more accurate. This algorithm can reduce noise interference and optimize signal quality, thereby ensuring high-quality output of the target signal (first target signal). This makes the defect detection results more reliable and helps to achieve high-precision porcelain sleeve defect imaging.

[0062] As a possible implementation method, in the embodiment of the present application, the diffraction signal of the ultrasonic signal is received by an ultrasonic receiving array, and processed by a full focusing algorithm to extract the pitch-catch echo of the diffraction signal to obtain the second target signal, including:

[0063] The diffraction signal is calculated based on the second preset formula (Formula 2) to obtain the second target signal:

[0064]

[0065] Where r2(t) is the second target signal, σ′ is the reflection coefficient of the diffraction signal, and w′(t m ) is the directivity function of the diffraction signal, a′(t) is the envelope of the diffraction signal, R′(t) is the distance of the diffraction signal, and f c ' is the carrier frequency of the diffraction signal, and k' is the beam of the diffraction signal.

[0066] Specifically, the ultrasonic receiving array is used to receive the diffraction signal generated after the ultrasonic signal passes through the cable porcelain sleeve. The diffraction signal is a signal generated by the bending or diffraction of the sound wave at the porcelain sleeve defects (such as cracks, holes, etc.). The full focusing algorithm is used to process these signals to extract the pitch-catch echo in the diffraction signal, that is, the part of the signal where the ultrasonic beam propagates to the defect and reflects back. The detection capability of partial and deep defects in the cable porcelain sleeve is enhanced. The diffraction signal can penetrate thicker materials and help detect defects below the surface, providing more details for the comprehensive detection of the porcelain sleeve, especially for the identification of deep defects.

[0067] As a possible implementation method, in the embodiment of the present application, multiple target signals are processed by a diffraction all-focusing imaging algorithm, including:

[0068] The first target signal and the second target signal are superimposed to obtain a third target signal:

[0069] R(t)=r1(t)+r2(t) Formula 3

[0070] Wherein, R(t) is the third target signal.

[0071] Specifically, the first target signal and the second target signal are obtained by processing the backscattered signal and the diffraction signal, respectively. The first target signal is obtained by extracting the pulse echo of the backscattered signal, while the second target signal is obtained by extracting the pitch-catch echo of the diffraction signal. By superimposing the two, a new signal, the third target signal, is obtained. The process of superimposing the backscattered signal and the diffraction signal into the third target signal helps to combine the information advantages of these two signal sources to form a more comprehensive and accurate target signal. The backscattered signal helps to extract surface and near-surface defect information, while the diffraction signal can penetrate deep into the porcelain sleeve and detect deeper defects. By superimposing these two types of signals, their respective advantages can be fully utilized to improve the quality of the signal and the accuracy of the detection results.

[0072] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of imaging the processed target signal to obtain the target image of the present application will be described in detail below in conjunction with a specific embodiment, including the following steps:

[0073] Step S501: construct a candidate contour image of the cable porcelain sleeve, and arbitrarily select a point in the candidate contour image as a virtual focus point.

[0074] Specifically, the target signal obtained by the diffraction full-focusing imaging algorithm is first processed to construct an alternative contour image of the cable porcelain sleeve. This image represents the overall structure or contour of the cable porcelain sleeve and reflects the response characteristics of the cable porcelain sleeve under the propagation of ultrasonic signals. Then, any point in the image is selected as a virtual focus point for subsequent image processing and pixel point calculation. By selecting a virtual focus point in the alternative contour image, the propagation characteristics of ultrasound can be better simulated and the imaging quality can be optimized. The selection of the virtual focus point provides a reference point for the subsequent imaging process, ensuring the accurate division and processing of the image.

[0075] Step S502: dividing the candidate contour image into a plurality of pixel points based on the virtual focus point.

[0076] Specifically, the candidate contour image is divided into multiple pixels based on the virtual focus point. These pixels are evenly distributed in the image, and each pixel represents an area of ​​the cable porcelain sheath, reflecting the response characteristics of the area under the influence of sound waves. By dividing the candidate contour image into multiple pixels, it can provide refined spatial information for subsequent signal processing. Each pixel can be analyzed separately to ensure that the imaging process can capture the defect information of each level inside the cable porcelain sheath, improving the imaging resolution and accuracy.

[0077] Step S503: Calculate the sound pressure amplitude corresponding to each pixel point according to the third target signal to obtain the target sound pressure amplitude.

[0078] Specifically, according to the aforementioned third target signal, the sound pressure amplitude corresponding to each pixel is calculated. This calculation is based on the propagation characteristics of the ultrasonic signal and the processing results of the reflection / diffraction signal. The sound pressure amplitude of each pixel represents the intensity or response degree of the point under the action of the sound wave. Calculating the sound pressure amplitude of each pixel makes the imaging process more refined, and the sound pressure amplitude of each pixel can more truly reflect the ultrasonic response of the area, thereby effectively capturing the tiny defects of the cable porcelain sleeve.

[0079] Step S504 , normalizing the target sound pressure amplitude, and performing imaging according to the normalized target sound pressure amplitude to obtain a target image.

[0080] Specifically, the calculated target sound pressure amplitude is normalized to standardize the amplitudes of different pixels so that the responses of different regions are comparable during the imaging process and to avoid imaging errors caused by regional signal differences. The normalized target sound pressure amplitude is used to generate the final target image, which reflects the overall condition of the cable porcelain sheath, including its defect distribution. The normalization process ensures the consistency and accuracy of the imaging results. By normalizing the sound pressure amplitude, the influence of signal amplitude differences in different regions on the imaging quality can be avoided, thereby ensuring that the generated target image can fully and accurately display the status of the cable porcelain sheath.

[0081] Therefore, in the embodiment of the present application, by selecting a virtual focal point and dividing the image based on it, it is ensured that each area can be accurately captured and processed during the imaging process. After the alternative contour image is divided into multiple pixels, each pixel can be analyzed independently to ensure the improvement of image resolution. Each pixel represents a part of the cable porcelain sleeve. Through precise calculation and processing, the tiny defects in the cable porcelain sleeve can be captured with high precision. By calculating the sound pressure amplitude corresponding to each pixel and normalizing it, the imaging deviation caused by local signal differences is avoided. The normalized target sound pressure amplitude can ensure that the imaging results of different regions have high consistency and accuracy. Finally, the target image generated by the normalized target sound pressure amplitude can fully reflect the defect distribution of the cable porcelain sleeve. The image not only shows the surface defects, but also reveals the internal defects, ensuring that the health status of the porcelain sleeve can be fully analyzed. Through multi-step image processing and calculation, the imaging quality and accuracy of the cable porcelain sleeve are improved from multiple dimensions, providing a more reliable and comprehensive technical means for defect detection, ensuring that the imaging system can accurately identify and locate various defects in the cable porcelain sleeve.

[0082] An embodiment of the present invention provides a computer-readable storage medium, which includes a stored program. When the program is executed, the device where the computer-readable storage medium is located is controlled to execute the porcelain sleeve imaging method based on diffraction total focusing.

[0083] Specifically, the ceramic sleeve imaging method based on diffraction total focusing includes:

[0084] Step S301, controlling the ultrasonic transmitting array to transmit ultrasonic signals to the cable porcelain sleeve, and controlling the ultrasonic transmitting array and / or the ultrasonic receiving array to receive, to obtain multiple target signals.

[0085] Step S302: Process multiple target signals using a diffraction total focusing imaging algorithm, and perform imaging based on the processed target signals to obtain a target image.

[0086] Optionally, the ultrasonic transmitting array and / or the ultrasonic receiving array are controlled to receive and obtain multiple target signals, including: the ultrasonic transmitting array and the ultrasonic receiving array are used as a target array with a center gap being the installation distance between the ultrasonic transmitting array and the ultrasonic receiving array, the backscattered signal of the ultrasonic signal is received by the target array, and is processed by a total focusing algorithm to extract the pulse echo of the backscattered signal to obtain a first target signal; the diffraction signal of the ultrasonic signal is received by the ultrasonic receiving array, and is processed by a total focusing algorithm to extract the pitch-catch echo of the diffraction signal to obtain a second target signal.

[0087] Optionally, receiving the backscattered signal of the ultrasonic signal through the target array and processing it through the total focusing algorithm to extract the pulse echo of the backscattered signal to obtain the first target signal includes: operating the backscattered signal based on a first preset formula to obtain the first target signal:

[0088] Where r1(t) is the first target signal, σ is the reflection coefficient of the backscattered signal, and w(t m ) is the directivity function of the backscatter signal, a(t) is the envelope of the backscatter signal, R(t) is the distance of the backscatter signal, c is the speed of sound, and f c is the carrier frequency of the backscattered signal, and k is the beam of the backscattered signal.

[0089] Optionally, receiving the diffraction signal of the ultrasonic signal by an ultrasonic receiving array and processing it by a full focusing algorithm to extract the pitch-catch echo of the diffraction signal to obtain a second target signal includes: operating the diffraction signal based on a second preset formula to obtain the second target signal:

[0090] Where r2(t) is the second target signal, σ′ is the reflection coefficient of the diffraction signal, and w′(t m ) is the directivity function of the diffraction signal, a′(t) is the envelope of the diffraction signal, R′(t) is the distance of the diffraction signal, and f c ' is the carrier frequency of the diffraction signal, and k' is the beam of the diffraction signal.

[0091] Optionally, multiple target signals are processed by a diffraction total focusing imaging algorithm, including: superimposing the first target signal and the second target signal to obtain a third target signal: R(t)=r1(t)+r2(t); wherein R(t) is the third target signal.

[0092] Optionally, imaging is performed according to the processed target signal to obtain a target image, including: constructing an alternative contour image of the cable porcelain sleeve, and arbitrarily selecting a point in the alternative contour image as a virtual focal point; dividing the alternative contour image into multiple pixel points based on the virtual focal point; calculating the sound pressure amplitude corresponding to each pixel point according to the third target signal to obtain the target sound pressure amplitude; normalizing the target sound pressure amplitude, and imaging according to the normalized target sound pressure amplitude to obtain the target image.

[0093] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0094] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0095] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0096] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1A device that provides the functions specified in a block or multiple blocks.

[0097] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0098] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0099] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0100] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0101] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0102] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0103] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0104] 1) The porcelain sleeve imaging system based on diffraction full focusing of the present application includes: an ultrasonic transmitting array, which is at least used to transmit ultrasonic signals to the cable porcelain sleeve; an ultrasonic receiving array, which is used to receive the diffraction signal of the ultrasonic signal after being affected by the end angle and end point of the cable porcelain sleeve; a processor, an ultrasonic transmitting array and an ultrasonic receiving array are in communication connection, and are used to construct a three-dimensional image of the cable porcelain sleeve according to the ultrasonic signal and the diffraction signal through the diffraction full focusing imaging algorithm to obtain the target image. By receiving the diffraction signal at multiple angles, the subtle changes caused by the defect are captured, and the diffraction full focusing imaging algorithm is used to ensure the acquisition of clear imaging results of the deep area of ​​the cable porcelain sleeve, process the ultrasonic signal in real time, and generate a high-resolution three-dimensional image, which solves the problem of inaccurate detection results due to insufficient imaging depth when facing complex defects.

[0105] 2) The porcelain sleeve imaging method based on diffraction full focusing of the present application, by controlling the coordinated work of the ultrasonic transmitting array and the receiving array, the system can receive the reflected signals on the surface and inside of the cable porcelain sleeve in all directions, thereby ensuring the acquisition of multiple target signals. These signals can provide detailed information on each part of the porcelain sleeve, providing sufficient data support for subsequent image generation. The use of the diffraction full focusing imaging algorithm to process multiple target signals effectively breaks through the shortcomings of traditional imaging technology in deep defect detection. The algorithm can accurately identify various defects in the porcelain sleeve, including deep defects, surface defects, etc., and generate high-resolution target images to help inspectors more clearly identify the location, shape, size and direction of the defects. It can construct accurate three-dimensional images or two-dimensional images based on multiple target signals, providing more detailed and clear porcelain sleeve status information. Compared with the traditional single signal detection method, the diffraction full focusing imaging algorithm performs better in image processing and signal integration, can reduce signal interference, improve imaging quality, and reduce the possibility of missed detection or false detection. The imaging method can flexibly cope with various complex structures and working conditions of the cable porcelain sleeve, and adapt to different detection needs by adjusting the operation mode of the ultrasonic transmitting array and the receiving array in real time. Whether deep or surface defects need to be detected in actual applications, stable and efficient imaging performance can be maintained.

[0106] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A ceramic sleeve imaging system based on diffraction total focusing, characterized in that: The system comprises: An ultrasonic transmitting array, at least used for transmitting ultrasonic signals to the cable porcelain sleeve; An ultrasonic receiving array, used for receiving diffraction signals of the ultrasonic signal after being affected by the end angle and end point of the cable porcelain sleeve; The processor is communicatively connected with the ultrasonic transmitting array and the ultrasonic receiving array, and is used to construct a three-dimensional image of the cable porcelain sleeve according to the ultrasonic signal and the diffraction signal through a diffraction total focusing imaging algorithm to obtain a target image.

2. The system according to claim 1, characterized in that The ultrasonic transmitting array is installed between the terminal of the cable porcelain sleeve and the first shed, and the ultrasonic receiving array is installed between the flange of the cable porcelain sleeve and the last shed.

3. The system according to claim 2, characterized in that The ultrasonic transmitting array and the ultrasonic receiving array are installed in parallel.

4. A ceramic sleeve imaging method based on diffraction total focusing, characterized in that: The porcelain sleeve imaging method is applied to the porcelain sleeve imaging system based on diffraction total focusing as described in any one of claims 1 to 3, and the porcelain sleeve imaging method comprises: Controlling the ultrasonic transmitting array to transmit ultrasonic signals to the cable porcelain sleeve, and controlling the ultrasonic transmitting array and / or the ultrasonic receiving array to receive, so as to obtain multiple target signals; The plurality of target signals are processed by a diffraction total focusing imaging algorithm, and imaging is performed according to the processed target signals to obtain a target image.

5. The method according to claim 4, characterized in that Controlling the ultrasonic transmitting array and / or the ultrasonic receiving array to receive and obtain multiple target signals includes: The ultrasonic transmitting array and the ultrasonic receiving array are used as a target array whose central gap is the installation distance between the ultrasonic transmitting array and the ultrasonic receiving array, the backscattered signal of the ultrasonic signal is received by the target array, and the backscattered signal is processed by a total focusing algorithm to extract the pulse echo of the backscattered signal to obtain a first target signal; The diffraction signal of the ultrasonic signal is received by the ultrasonic receiving array and processed by a total focusing algorithm to extract the pitch-catch echo of the diffraction signal to obtain a second target signal.

6. The method according to claim 5, characterized in that The backscattered signal of the ultrasonic signal is received by the target array and processed by a total focusing algorithm to extract the pulse echo of the backscattered signal to obtain a first target signal, including: The backscattered signal is calculated based on a first preset formula to obtain the first target signal: Wherein, r1(t) is the first target signal, σ is the reflection coefficient of the backscattered signal, and w(t m ) is the directivity function of the backscattered signal, a(t) is the envelope of the backscattered signal, R(t) is the distance of the backscattered signal, c is the speed of sound, f c is the carrier frequency of the backscattered signal, and k is the beam of the backscattered signal.

7. The method according to claim 6, characterized in that The diffraction signal of the ultrasonic signal is received by the ultrasonic receiving array, and is processed by a full focusing algorithm to extract a pitch-catch echo of the diffraction signal to obtain a second target signal, including: The diffraction signal is calculated based on a second preset formula to obtain the second target signal: Wherein, r2(t) is the second target signal, σ′ is the reflection coefficient of the diffraction signal, and w′(t m ) is the directivity function of the diffraction signal, a′(t) is the envelope of the diffraction signal, R′(t) is the distance of the diffraction signal, and f c ' is the carrier frequency of the diffraction signal, and k' is the beam of the diffraction signal.

8. The method according to claim 7, characterized in that The plurality of target signals are processed by a diffraction total focusing imaging algorithm, including: The first target signal and the second target signal are superimposed to obtain a third target signal: R(t)=r1(t)+r2(t); Wherein, R(t) is the third target signal.

9. The method according to claim 8, characterized in that Performing imaging according to the processed target signal to obtain a target image includes: Constructing an alternative contour image of the cable porcelain sleeve, and arbitrarily selecting a point in the alternative contour image as a virtual focus point; Dividing the candidate contour image into a plurality of pixel points based on the virtual focus point; Calculate the sound pressure amplitude corresponding to each pixel point according to the third target signal to obtain a target sound pressure amplitude; The target sound pressure amplitude is normalized, and imaging is performed according to the normalized target sound pressure amplitude to obtain the target image.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the method according to any one of claims 4 to 9.

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