Implantable concrete structure damage detection system based on spherical piezoelectric ceramic array

Abstract

The present invention discloses an implantable concrete structure damage detection system based on a spherical piezoelectric ceramic array. The system comprises two spherical piezoelectric ceramic array sensors, each capable of serving as a driving end and a receiving end. The driving end and the receiving end are implanted at either end of the concrete structure to be inspected. The driving end is connected to a multi-channel signal generator, and the receiving end is connected to a multi-channel signal acquisition instrument. Both the multi-channel signal generator and the multi-channel signal acquisition instrument are connected to a workstation. The spherical piezoelectric ceramic array sensor is a cylindrical module with multiple spherical piezoelectric ceramics uniformly arranged inside. Multiple spherical piezoelectric ceramics are arranged in an array to perform scanning tests. The multiple spherical piezoelectric ceramics are connected to a multi-hole connector via shielded wires, and the multi-hole connector is connected to the multi-channel signal generator or the multi-channel signal acquisition instrument. The present invention can improve the identification of internal concrete structural damage.

Description

Technical Field

[0001] The present invention relates to the technical field of nondestructive testing and monitoring of civil engineering structures, and in particular to an implantable concrete structure damage detection system based on a spherical piezoelectric ceramic array. Background Art

[0002] Reinforced concrete structures are widely used in large-scale civil engineering structures. Under the influence of environmental factors such as load and temperature, concrete structures will inevitably experience varying degrees of cracking. Efficient and accurate testing of internal damage and cracks remains a technical challenge in the field of structural damage detection.

[0003] Traditional embedded sensors need to be installed during the construction phase and are not suitable for monitoring reinforced concrete structures during their service life. Therefore, implantable PZT piezoelectric sensors have been developed to achieve long-term monitoring of structures during their service life.

[0004] Commonly used implantable sensors typically use circular or rectangular PZT piezoelectric ceramics as their core sensing element, encapsulated in a concrete shell for protection, insulation, and waterproofing. However, this type of PZT ceramic can only sense stress waves in a specific direction, enabling only 2D stress wave sensing.

[0005] In order to realize the detection and monitoring of internal cracks in concrete with 3D stress wave sensing capability and realize wearable modularity, the applicant team has proposed Figure 1 The cuboid sensing module shown in the figure was constructed, and corresponding sensor elements were made and relevant experimental research was carried out. Figure 1 The perception module and method shown have the following four technical drawbacks:

[0006] 1) In terms of shape, a cubic module is used for packaging. It is difficult to open holes in a rectangular block and it is difficult to accurately control the accuracy of the hole shape and the surface roughness. The rough surface will increase interface reflection and reduce the propagation efficiency of the stress wave. 2) This method uses a copper tube as a positioning rod for the spherical PZT. The existence of this positioning rod greatly changes the vibration form of the PZT ball and the propagation of the stress wave it excites. 3) In addition, the PZT ball uses black rubber as an insulating and protective layer. Because rubber is soft and has strong wave absorption ability, it greatly weakens the signal energy and frequency of the stress wave excited by the PZT ball, which is very unfavorable for the propagation of weak stress wave signals in concrete structures. The stress wave energy received by the sensor will be significantly reduced and the frequency will have a large error with the preset excitation frequency. 4) This scheme adopts a diamond arrangement scheme of four spherical sensors on a plane. The original purpose was to hope that the four spherical sensors could achieve focusing and superposition of stress waves after propagation for a certain distance, so as to achieve self-enhancement of the stress wave signal. However, the use of spherical rods and rubber sheaths as auxiliary processes significantly disrupts the stress wave formation mechanism. 5) Due to the relatively chaotic stress generated by the signal excitation end, the sensing end cannot effectively detect vertical cracks when using the same PZT ball arrangement. This arrangement cannot be used to identify cracks in the longitudinal or other directions.

[0007] Therefore, based on the existing research and in combination with the shortcomings and drawbacks of the existing methods, the implementation scheme of the present invention is proposed. Summary of the Invention

[0008] In response to the technical problems faced by existing implantable sensors and wearable modules, such as installation difficulties, unclear signal excitation mechanisms, and poor defect perception and recognition capabilities, the purpose of the present invention is to provide an implantable concrete structure damage detection system based on a spherical piezoelectric ceramic array. This system is based on a linear array of PZT spherical sensors, adopts a cylindrical concrete substrate as a wearable module, eliminates the auxiliary positioning device, improves the quality of the excited stress wave, and enhances the damage identification effect. The cylindrical sensing modules are arranged horizontally and vertically to realize the identification and monitoring of cracks in different directions.

[0009] To solve the above technical problems, the embodiments of the present invention provide the following solutions:

[0010] An implantable concrete structure damage detection system based on a spherical piezoelectric ceramic array includes two spherical piezoelectric ceramic array sensors that can serve as a driving end and a receiving end, respectively. The driving end and the receiving end are implanted at two ends of the concrete structure to be detected.

[0011] The driving end is connected to a multi-channel signal generator, the receiving end is connected to a multi-channel signal acquisition instrument, and both the multi-channel signal generator and the multi-channel signal acquisition instrument are connected to a workstation;

[0012] Among them, the spherical piezoelectric ceramic array sensor is a cylindrical module with multiple spherical piezoelectric ceramics evenly arranged inside. Multiple spherical piezoelectric ceramics are arranged in an array to carry out scanning testing; multiple spherical piezoelectric ceramics are connected to a multi-hole connector through shielded wires, and the multi-hole connector is connected to the multi-channel signal generator or the multi-channel signal acquisition instrument.

[0013] Preferably, the spherical piezoelectric ceramic array sensor includes a bottom semi-cylinder and a top semi-cylinder, and the bottom semi-cylinder and the top semi-cylinder are respectively provided with a plurality of grooves for accommodating half of the spherical piezoelectric ceramics. The positions of the grooves are used to position the spherical piezoelectric ceramics. The bottom semi-cylinder and the top semi-cylinder are buckled together to form a cylindrical module, which accommodates a plurality of the spherical piezoelectric ceramics.

[0014] Preferably, the bottom semi-cylinder and the top semi-cylinder are made of a high-strength, low-shrinkage concrete matrix and are prepared by 3D printing technology. After the two are buckled together, they are encapsulated with epoxy resin.

[0015] Preferably, the number of the spherical piezoelectric ceramics is not less than 5.

[0016] Preferably, the plurality of spherical piezoelectric ceramics are evenly arranged at preset intervals in the direction of the central axis of the cylindrical module.

[0017] Preferably, the spherical piezoelectric ceramic array sensor is bonded to the embedded concrete structure by epoxy resin.

[0018] Preferably, the functions of the spherical piezoelectric ceramic array sensor as the driving end and the spherical piezoelectric ceramic array sensor as the receiving end can be interchanged, that is, the spherical piezoelectric ceramic array sensor as the driving end can also be used as the receiving end, and correspondingly, the spherical piezoelectric ceramic array sensor as the receiving end can also be used as the driving end.

[0019] Preferably, the detection system further includes an oscilloscope and a voltage signal amplifier, the oscilloscope is connected to the multi-channel signal generator, the input end of the voltage signal amplifier is connected to the multi-channel signal generator, and the output end of the voltage signal amplifier is connected to the driving end.

[0020] Preferably, the installation method of the spherical piezoelectric ceramic array sensor is as follows:

[0021] Using high-strength, low-shrinkage concrete as the matrix, the number and positioning of spherical piezoelectric ceramics are set according to requirements to prepare a spherical piezoelectric ceramic array sensor.

[0022] Holes are opened at both ends of the concrete structure to be tested, and spherical piezoelectric ceramic array sensors are implanted respectively, with one end serving as the driving end and the other end as the receiving end.

[0023] Pour low shrinkage epoxy resin and let it stand and cure for more than 24 hours;

[0024] Connect external devices for debugging.

[0025] Preferably, the detection method of the detection system is as follows:

[0026] The computer of the workstation sends a trigger signal to the multi-channel signal generator;

[0027] The multi-channel signal generator generates waveforms, which are then checked using an oscilloscope;

[0028] If the waveform check is normal, the signal is input into the voltage signal amplifier; if the waveform check is abnormal, the circuit is checked and the trigger signal is re-issued;

[0029] The voltage signal amplifier inputs the amplified signal into the driver end, and the multiple spherical piezoelectric ceramics at the driver end generate high-frequency stress waves;

[0030] The multiple spherical piezoelectric ceramics corresponding to the receiving end sense the high-frequency stress wave, generate an induction signal and transmit it to the multi-channel signal acquisition instrument;

[0031] The multi-channel signal acquisition instrument sends the collected sensing signals to the computer at the workstation for storage and analysis;

[0032] The computer of the workstation performs signal time domain / frequency domain analysis based on the collected sensing signals, and uses parameters including signal energy, first wave sound time, signal frequency, and amplitude as damage assessment indicators to achieve multi-parameter damage assessment.

[0033] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0034] The present invention proposes a cylindrical wearable module based on a spherical piezoelectric ceramic array, which solves the technical problems of inaccurate pre-embedded positioning of traditional sensors and poor quality of module installation holes; a method of assembling semi-cylinders with hemispherical grooves based on 3D printing effectively avoids the disturbance of stress waves by positioning rods and additional devices, and solves the influence of traditional rubber layer-based methods on the reduction of stress wave energy; the internal structure of the present invention is simple, which solves the problem of complex cross-section reflection waves caused by the mismatch of acoustic impedances of multiple materials inside the module, and has high stress wave triggering quality; the cylindrical sensing modules are arranged horizontally and vertically, which can realize the identification and monitoring of cracks in different directions, and can be widely used in damage identification and detection of large-scale infrastructure such as construction projects and bridge projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 It is a structural diagram of a rectangular parallelepiped perception module in the prior art;

[0037] Figure 2 Schematic diagram of the structure of an implantable concrete structure damage detection system based on a spherical piezoelectric ceramic array provided by an embodiment of the present invention;

[0038] Figure 3 1 is a schematic diagram of the assembly of a spherical piezoelectric ceramic array sensor provided by an embodiment of the present invention;

[0039] Figure 4 is a schematic diagram of an assembled spherical piezoelectric ceramic array sensor provided by an embodiment of the present invention;

[0040] Figure 5 Schematic diagram of the internal structure of a spherical piezoelectric ceramic provided by an embodiment of the present invention;

[0041] Figure 6 Schematic diagram of the installation and detection method of the detection system provided by an embodiment of the present invention;

[0042] Figure 7 Schematic diagram of the detection process provided by an embodiment of the present invention;

[0043] Figure 8 3 is a schematic diagram of a time-domain voltage signal of a typical case provided by an embodiment of the present invention.

[0044] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of protection of the present invention. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] The embodiment of the present invention provides an implantable concrete structure damage detection system based on a spherical piezoelectric ceramic array, such as Figure 2 As shown, the detection system includes two spherical piezoelectric ceramic array sensors that can serve as a driving end 1 and a receiving end 2 respectively. The driving end 1 and the receiving end 2 are implanted at both ends of the concrete structure to be detected;

[0047] The driving end 1 is connected to the multi-channel signal generator 3, the receiving end 2 is connected to the multi-channel signal acquisition instrument 4, and the multi-channel signal generator 3 and the multi-channel signal acquisition instrument 4 are both connected to the workstation 5; the workstation here includes at least one high-performance computer;

[0048] To improve detection accuracy, the detection system also includes an oscilloscope 6 and a voltage signal amplifier 7. The oscilloscope 6 is connected to the multi-channel signal generator 3. The input end of the voltage signal amplifier 7 is connected to the multi-channel signal generator 3, and the output end of the voltage signal amplifier 7 is connected to the driving end 1.

[0049] Furthermore, if Figure 3-Figure 5 Figure 2 shows the structure and assembly process of the spherical piezoelectric ceramic array sensor. The spherical piezoelectric ceramic array sensor is a cylindrical module with multiple spherical piezoelectric ceramics 13 evenly spaced within it. Arranging these spherical piezoelectric ceramics 13 in an array allows for scanning testing, significantly improving damage detection accuracy and efficiency. These spherical piezoelectric ceramics 13 are connected via shielded conductors 8 to a multi-hole connector 9, which is then connected to a multi-channel signal generator 3 or a multi-channel signal acquisition device 4.

[0050] In an embodiment of the present invention, the spherical piezoelectric ceramic array sensor includes a bottom semi-cylinder 10 and a top semi-cylinder 11. The bottom semi-cylinder 11 and the top semi-cylinder 12 are respectively provided with a plurality of grooves for accommodating half of a spherical piezoelectric ceramic 13. The position of the groove is used to position the spherical piezoelectric ceramic 13. The bottom semi-cylinder 10 and the top semi-cylinder 11 are buckled together to form a cylindrical module, which accommodates multiple spherical piezoelectric ceramics 13 inside.

[0051] As a preferred embodiment of the present invention, the bottom semi-cylinder 10 and the top semi-cylinder 11 are fabricated using 3D printing technology using a high-strength, low-shrinkage concrete matrix. After being joined, they are encapsulated with epoxy resin to prevent damage to the spherical piezoelectric ceramics during the concrete casting and hardening process, while also providing waterproof insulation. This method of assembling the semi-cylinders with hemispherical grooves, based on 3D printing, effectively avoids the disturbance of stress waves caused by positioning rods and additional devices, addressing the impact of traditional rubber layers on stress wave energy reduction.

[0052] This invention significantly improves the ease of installation of implantable sensors by providing cylindrical mounting holes in the structure to be detected. The geometric dimensions of the implantable sensor can be adjusted based on the size of the structure to be detected. To ensure detection accuracy, the number of pre-embedded spherical piezoelectric ceramics should not be less than five, and these spherical piezoelectric ceramics should be evenly spaced at a predetermined distance along the central axis of the cylindrical module.

[0053] Furthermore, in an embodiment of the present invention, the functions of the spherical piezoelectric ceramic array sensor serving as the driving end and the spherical piezoelectric ceramic array sensor serving as the receiving end can be interchanged, that is, the spherical piezoelectric ceramic array sensor serving as the driving end can also be used as the receiving end, and correspondingly, the spherical piezoelectric ceramic array sensor serving as the receiving end can also be used as the driving end. The two measurement modes can be flexibly selected, which greatly improves the convenience of detection.

[0054] like Figure 6 As shown, the installation method of the spherical piezoelectric ceramic array sensor is as follows:

[0055] Using high-strength, low-shrinkage concrete as the matrix, the number and positioning of spherical piezoelectric ceramics are set according to requirements to prepare a spherical piezoelectric ceramic array sensor; the above-mentioned 3D printing method can be used to make the device;

[0056] Holes are opened at both ends of the concrete structure to be tested, and spherical piezoelectric ceramic array sensors are implanted respectively; one end serves as the driving end and the other end as the receiving end;

[0057] Low-shrinkage epoxy resin is poured and allowed to cure for more than 24 hours. The spherical piezoelectric ceramic array sensor is bonded to the embedded concrete structure with epoxy resin. This method causes minimal damage to the structure and is easy to install.

[0058] Connect external devices for debugging.

[0059] Furthermore, if Figure 6 As shown, the detection method of the detection system is as follows:

[0060] The computer of the workstation sends a trigger signal to the multi-channel signal generator;

[0061] The multi-channel signal generator generates waveforms, which are then checked using an oscilloscope;

[0062] If the waveform check is normal, the signal is input into the voltage signal amplifier; if the waveform check is abnormal, the circuit is checked and the trigger signal is re-issued;

[0063] The voltage signal amplifier inputs the amplified signal into the driver end, and the multiple spherical piezoelectric ceramics at the driver end generate high-frequency stress waves;

[0064] The multiple spherical piezoelectric ceramics corresponding to the receiving end sense the high-frequency stress wave, generate an induction signal and transmit it to the multi-channel signal acquisition instrument;

[0065] The multi-channel signal acquisition instrument sends the collected sensing signals to the computer at the workstation for storage and analysis;

[0066] The computer of the workstation performs signal time domain / frequency domain analysis based on the collected sensing signals, and uses parameters including signal energy, first wave sound time, signal frequency, and amplitude as damage assessment indicators to achieve multi-parameter damage assessment.

[0067] Figure 7 It is a schematic diagram of the detection process of an embodiment of the present invention. The present invention can use parameters such as signal energy, first wave sound time, signal frequency, amplitude, etc. as indicators for damage assessment at the same time, thereby realizing multi-parameter damage assessment, avoiding misjudgment caused by traditional single parameter or indicator evaluation methods, and improving test accuracy.

[0068] Figure 8 This is a schematic diagram of a typical time-domain voltage signal from an embodiment of the present invention. Based on the changes in the voltage amplitude of the detected induced signal, the detection method of the present invention can clearly identify whether the concrete's internal structure is damaged and where the damage is, significantly improving the accuracy and efficiency of damage detection.

[0069] The present invention has a simple internal structure, which solves the problem of complex cross-section reflection waves caused by the mismatch of acoustic impedance of multiple materials inside the module, and has high stress wave triggering quality; the cylindrical sensing modules are arranged horizontally and vertically, which can realize the identification and monitoring of cracks in different directions, and can be widely used in damage identification and detection of large-scale infrastructure such as construction projects and bridge projects.

[0070] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or terminal device that includes 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, article, or terminal device. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes the element.

[0071] References in the specification to "one embodiment," "an embodiment," "an exemplary embodiment," "some embodiments," etc. indicate that the described embodiments may include a particular feature, structure, or characteristic, but not every embodiment may include that particular feature, structure, or characteristic. In addition, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of persons skilled in the relevant art to implement such feature, structure, or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0072] In general, terms can be understood, at least in part, from their use in context. For example, depending at least in part on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending at least in part on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0073] As used herein, the term "nominal / nominally" refers to a desired or target value for a characteristic or parameter of a component or process operation set during the design phase of a production or manufacturing process, as well as a range of values ​​above and / or below the desired value. The range of values ​​may be due to slight variations in the manufacturing process or tolerances. As used herein, the term "approximately" indicates a value of a given quantity that may vary based on a particular technology node associated with the subject semiconductor device. Based on a particular technology node, the term "approximately" may indicate a value of a given quantity that varies, for example, within 5%-15% of the value (e.g., ±5%, ±10%, or ±15% of the value).

[0074] It will be understood that the meanings of “on,” “over,” and “above” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes being “on” something with intervening features or layers, and “on” or “over” means not only “on” or “above” something, but also includes being “on” or “above” something with no intervening features or layers.

[0075] Additionally, spatially relative terms such as "below," "beneath," "lower," "above," and "upper" may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as illustrated in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein should be similarly interpreted accordingly.

[0076] The present invention encompasses any alternatives, modifications, equivalents, and solutions that fall within the spirit and scope of the present invention. To provide a thorough understanding of the present invention, specific details are described in detail below in connection with the preferred embodiments of the present invention, but those skilled in the art will be able to fully understand the present invention without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of the present invention, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0077] Those skilled in the art will understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An implantable concrete structure damage detection system based on a spherical piezoelectric ceramic array, characterized in that: It includes two spherical piezoelectric ceramic array sensors that can serve as a driving end and a receiving end respectively, and the driving end and the receiving end are implanted at two ends of the concrete structure to be detected; The driving end is connected to a multi-channel signal generator, the receiving end is connected to a multi-channel signal acquisition instrument, and both the multi-channel signal generator and the multi-channel signal acquisition instrument are connected to a workstation; The spherical piezoelectric ceramic array sensor is a cylindrical module with multiple spherical piezoelectric ceramics evenly arranged inside. Multiple spherical piezoelectric ceramics are arranged in an array to carry out scanning tests. The multiple spherical piezoelectric ceramics are connected to a multi-hole connector via shielded wires, and the multi-hole connector is connected to the multi-channel signal generator or the multi-channel signal acquisition instrument. The spherical piezoelectric ceramic array sensor includes a bottom semi-cylinder and a top semi-cylinder, wherein the bottom semi-cylinder and the top semi-cylinder are respectively provided with a plurality of grooves for accommodating half of the spherical piezoelectric ceramics, and the positions of the grooves are used to position the spherical piezoelectric ceramics. The bottom semi-cylinder and the top semi-cylinder are buckled together to form a cylindrical module, which accommodates a plurality of the spherical piezoelectric ceramics; The bottom semi-cylinder and the top semi-cylinder are made of a high-strength, low-shrinkage concrete matrix and are prepared through 3D printing technology. After the two are buckled together, they are encapsulated with epoxy resin.

2. The implantable concrete structure damage detection system based on spherical piezoelectric ceramic array according to claim 1 is characterized in that: The number of the spherical piezoelectric ceramics is not less than 5.

3. The implantable concrete structure damage detection system based on spherical piezoelectric ceramic array according to claim 1 is characterized in that: The plurality of spherical piezoelectric ceramics are evenly arranged at a preset interval in the central axis direction of the cylindrical module.

4. The implantable concrete structure damage detection system based on spherical piezoelectric ceramic array according to claim 1 is characterized in that: The spherical piezoelectric ceramic array sensor is bonded to the embedded concrete structure through epoxy resin.

5. The implantable concrete structure damage detection system based on spherical piezoelectric ceramic array according to claim 1 is characterized in that: The functions of the spherical piezoelectric ceramic array sensor as the driving end and the spherical piezoelectric ceramic array sensor as the receiving end are interchangeable, that is, the spherical piezoelectric ceramic array sensor as the driving end can also be used as the receiving end, and correspondingly, the spherical piezoelectric ceramic array sensor as the receiving end can also be used as the driving end.

6. The implantable concrete structure damage detection system based on spherical piezoelectric ceramic array according to claim 1 is characterized in that: The detection system further includes an oscilloscope and a voltage signal amplifier. The oscilloscope is connected to the multi-channel signal generator. The input end of the voltage signal amplifier is connected to the multi-channel signal generator, and the output end of the voltage signal amplifier is connected to the driving end.

7. The implantable concrete structure damage detection system based on spherical piezoelectric ceramic array according to claim 1 is characterized in that: The installation method of the spherical piezoelectric ceramic array sensor is as follows: Using high-strength, low-shrinkage concrete as the matrix, the number and positioning of spherical piezoelectric ceramics are set according to requirements to prepare a spherical piezoelectric ceramic array sensor. Holes are opened at both ends of the concrete structure to be tested, and spherical piezoelectric ceramic array sensors are implanted respectively, with one end serving as the driving end and the other end as the receiving end. Pour low shrinkage epoxy resin and let it stand and cure for more than 24 hours; Connect external devices for debugging.

8. The implantable concrete structure damage detection system based on spherical piezoelectric ceramic array according to claim 1 is characterized in that: The detection method of the detection system is as follows: The computer of the workstation sends a trigger signal to the multi-channel signal generator; The multi-channel signal generator generates waveforms, which are then checked using an oscilloscope; If the waveform is normal, the signal is input into the voltage signal amplifier; If the waveform check is abnormal, check the circuit and re-issue the trigger signal; The voltage signal amplifier inputs the amplified signal into the driver end, and the multiple spherical piezoelectric ceramics at the driver end generate high-frequency stress waves; The multiple spherical piezoelectric ceramics corresponding to the receiving end sense the high-frequency stress wave, generate an induction signal and transmit it to the multi-channel signal acquisition instrument; The multi-channel signal acquisition instrument sends the collected sensing signals to the computer at the workstation for storage and analysis; The computer of the workstation performs signal time domain / frequency domain analysis based on the collected sensing signals, and uses parameters including signal energy, first wave sound time, signal frequency, and amplitude as damage assessment indicators to achieve multi-parameter damage assessment.

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