A stress-coordinated afterglow luminescence-based intelligent detector for strontium aluminate ceramics

Abstract

This utility model discloses a stress-coordinated afterglow luminescence intelligent detector for strontium aluminate ceramics. It is characterized by comprising a solid-state detection element, a photoelectric acquisition module, and a fixing device. One end of the fixing device is connected to a steel reinforcement frame inside a wall, and the other end of the fixing device is equipped with the solid-state detection element, which is connected to the photoelectric acquisition module via an optical fiber. The fixing device includes a base and an elastic clamping member. The elastic clamping member is located on the end face of the base, and the solid-state detection element is housed within the elastic clamping member. By introducing the mechanoluminescence and long afterglow characteristics of strontium aluminate ceramic materials, combined with a reasonable structural design and installation method, this utility model overcomes the limitations of existing technologies in concealed engineering applications, achieving passive, visualized long-term monitoring.

Description

Technical Field

[0001] This invention belongs to the field of smart materials and sensor technology, and particularly relates to a stress-coordinated afterglow luminescence smart detector for strontium aluminate ceramics. Background Technology

[0002] The demand for intelligent detectors is growing in fields such as building structural health monitoring and underground pipeline safety assessment. Traditional intelligent detectors mainly rely on electrical signals, optical imaging, or mechanical sensing to monitor conditions, but their application in concealed engineering projects has significant limitations. For example, existing technologies typically require complex wiring systems, are susceptible to electromagnetic interference, and are difficult to embed continuously within materials for extended periods. These issues limit their effectiveness in real-world scenarios.

[0003] While the contactless intelligent liquid level detector with publication number CN114993409B achieves contactless detection of liquid levels in non-transparent containers, its principle of relying on changes in dielectric constant or ultrasonic reflection is only applicable to fluid interface identification. It cannot sense the internal stress state of solid materials, nor does it have the function of converting mechanical stress into optical signals. Furthermore, this device relies on external power supply and signal processing modules, lacks self-illuminating properties, and is difficult to embed as a long-term buried unit inside concrete or walls.

[0004] The intelligent imaging detector for pipelines based on tomographic measurement, published in CN115264407B, reconstructs the flow state inside the pipe using tomographic imaging technology, enabling visual early warning of corrosion or deposit scaling. However, its device is bulky and requires an external data acquisition system and computer for image reconstruction, making it an external scanning detection method that struggles to achieve in-situ, real-time stress sensing within the material itself. Furthermore, this technology relies on complex external electronic systems and algorithms, lacks self-driving and self-illuminating characteristics, and cannot respond to minute local stress changes and present them visually.

[0005] The above problems indicate that most current mainstream intelligent detectors rely on external power sources, complex circuits, or non-contact scanning methods. They have not yet formed a solid-state light-emitting sensing mechanism that can directly convert mechanical stress into stable optical signals and embed them into the structure for a long time. Especially in application scenarios that require long-term monitoring of structural deformation and stress accumulation, existing technologies have obvious shortcomings in achieving passive, visual, and embedded integrated intelligent sensing. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a stress-coordinated afterglow luminescence strontium aluminate ceramic intelligent detector. By introducing the mechanoluminescence and long afterglow characteristics of strontium aluminate ceramic material, combined with a reasonable structural design and installation method, this invention solves the limitations of the existing technology in concealed engineering and realizes passive, visualized long-term monitoring.

[0007] To achieve the aforementioned objectives of this utility model, the technical solution provided by this utility model patent is as follows:

[0008] A stress-coordinated afterglow luminescence ceramic intelligent detector for strontium aluminate includes a solid-state detection element, a photoelectric acquisition module, and a fixing device. One end of the fixing device is connected to a steel reinforcement frame inside a wall, and the other end of the fixing device is provided with a solid-state detection element, which is connected to the photoelectric acquisition module via an optical fiber. The fixing device includes a base and an elastic clamping member. The elastic clamping member is provided on the end face of the base, and the solid-state detection element is disposed within the elastic clamping member.

[0009] Furthermore, the base is provided with mounting holes at its four corners, and binding wires are installed in the mounting holes. The binding wires pass through the mounting holes to connect and fix the base to the internal steel reinforcement skeleton of the wall. The elastic clamp is an arc-shaped clamp, and the bottom of the elastic clamp is fixed to the base by bolts. The elastic clamp is perpendicularly connected to the end face of the base.

[0010] Furthermore, the base end face is provided with two elastic clamping members, the internal space of the elastic clamping members clamps and fixes the solid detection element, and the inner side of the elastic clamping members is provided with a flexible pad layer with a thickness of 1mm-3mm, and the material of the flexible pad layer is silicone or polyurethane.

[0011] Furthermore, the solid-state detection element is embedded with a violet LED, the side of the solid-state detection element is polished, and the solid-state detection element is made of strontium aluminate ceramic material.

[0012] Furthermore, the photoelectric acquisition module includes an optical signal receiver, a signal processing unit, and a wireless transmission module. The photoelectric acquisition module has an optical fiber interface on one side. The optical signal receiver is connected to one end of an optical fiber through the optical fiber interface. The other end of the optical fiber is fixed to the polished side of the solid-state detection element through an optical coupling agent. The optical signal receiver receives the optical signal transmitted by the optical fiber. The optical signal is transmitted to the signal processing unit for processing and then uploaded to the cloud platform through the wireless transmission module.

[0013] Furthermore, the optical fiber between the solid detection element and the photoelectric acquisition module is arranged along a pre-set groove inside the wall. The groove is 10-20mm deep and 5-10mm wide. A protective cover plate is also provided on the groove, which completely covers the groove. The protective cover plate is 2-3mm thick and made of polycarbonate.

[0014] Based on the above scheme, the present invention provides a stress-coordinated afterglow luminescence-based intelligent detector for strontium aluminate ceramics, which has achieved positive and beneficial results in practice.

[0015] 1. The present invention relates to a stress-coordinated afterglow luminescence strontium aluminate ceramic intelligent detector. The design of the fixing device ensures the stability of the solid detection element inside the wall, and the precise design of the fiber optic cabling path avoids signal interruption caused by external force squeezing or damage.

[0016] 2. This utility model discloses a stress-coordinated afterglow luminescence ceramic intelligent detector for strontium aluminate. Through the setting of solid detection elements, photoelectric acquisition modules and fixing devices, it realizes passive and visualized online monitoring of stress distribution inside building structures. It is suitable for scenarios such as building structure health monitoring and underground pipeline safety assessment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the detector in a stress-coordinated afterglow luminescence ceramic intelligent detector of strontium aluminate according to this utility model.

[0018] Figure 2 This is a structural diagram of the solid detection element in a stress-coordinated afterglow luminescence ceramic intelligent detector of strontium aluminate according to this utility model.

[0019] Figure 3 This is a structural diagram of the photoelectric acquisition module in a stress-coordinated afterglow luminescence intelligent detector for strontium aluminate ceramics.

[0020] Figure 4 This is a structural diagram of the fixing device in a stress-coordinated afterglow luminescence ceramic intelligent detector of strontium aluminate according to this utility model.

[0021] Figure 5 This is a structural diagram of the fiber optic cabling path in a stress-coordinated afterglow luminescence ceramic intelligent detector of strontium aluminate according to this utility model.

[0022] The attached figures are labeled as follows: 1. Solid-state detection element; 2. Photoelectric acquisition module; 3. Fixing device; 4. Base; 5. Elastic clamp; 6. Binding wire; 7. Optical fiber; 8. Cable tray; 9. Protective cover. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific examples shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of this invention.

[0024] like Figure 1-5 As shown, this utility model belongs to a stress-coordinated afterglow luminescence ceramic intelligent detector for strontium aluminate, including a solid detection element 1, a photoelectric acquisition module 2, and a fixing device 3. One end of the fixing device 3 is connected to the internal steel reinforcement frame of the wall, and the other end of the fixing device 3 is provided with the solid detection element 1. The solid detection element 1 is connected to the photoelectric acquisition module 2 through an optical fiber 7. The fixing device 3 includes a base 4 and an elastic clamping member 5. The elastic clamping member 5 is provided on the end face of the base 4, and the solid detection element 1 is disposed inside the elastic clamping member 5.

[0025] like Figure 4 As shown, the base 4 has mounting holes at its four corners, and binding wires 6 are installed in the mounting holes. The binding wires 6 pass through the mounting holes to connect and fix the base 4 to the internal steel reinforcement skeleton of the wall. The elastic clamping member 5 is an arc-shaped clamping piece. The bottom of the elastic clamping member 5 is fixed to the base 4 by bolts. The elastic clamping member 5 is perpendicularly connected to the end face of the base 4.

[0026] After the binding wire 6 passes through the installation hole, it is fixed by double-strand winding with no less than 3 turns to ensure that the connection strength between the base 4 and the steel reinforcement cage meets the design requirements. The diameter of the binding wire 6 is 2mm-4mm, the tensile strength is not less than 1200MPa, and the end is fixed by double-strand winding to further enhance the reliability of the fixation.

[0027] The base 4 has two elastic clamping members 5 on its end face. The internal space of the elastic clamping members 5 clamps and fixes the solid detection element 1. The inner side of the elastic clamping members 5 is provided with a flexible pad layer with a thickness of 1mm-3mm. The material of the flexible pad layer is silicone or polyurethane.

[0028] like Figure 2 As shown, the elastic clamp 5 is designed to prevent displacement or loosening due to external loads. The design of the fixing device 3 fully considers the adaptability under different structural conditions. The mounting hole position of the base 4 can be flexibly adjusted according to the actual layout of the steel reinforcement cage. The double-strand winding method of the binding wire 6 and the threaded fit design of the arc-shaped clamp enable the entire device to achieve reliable fixing under various conditions.

[0029] The solid-state detection element 1 is embedded with a purple LED, the side of the solid-state detection element 1 is polished, and the solid-state detection element 1 is made of strontium aluminate ceramic material.

[0030] Solid-state detector element 1 is made of strontium aluminate ceramic material doped with rare earth elements, possessing mechanoluminescence and long afterglow characteristics; such as Figure 2 As shown, the solid detection element 1 can be cylindrical or polygonal, and its end face is polished to reduce surface defects and improve the stability and uniformity of the optical signal. In the actual manufacturing process, strontium aluminate ceramic powder is first mixed with selected rare earth elements (such as europium Eu or dysprosium Dy) in a certain proportion, wherein the doping ratio of rare earth elements is controlled between 0.5 mol% and 5 mol%. Then the mixed raw materials are pressed into a blank of the required shape.

[0031] The billet is heated at a rate of 5-10℃ / min within a temperature range of 1200℃ to 1400℃ and sintered in a nitrogen atmosphere for 4 to 6 hours, followed by cooling to room temperature at a rate of 2-5℃ / min. The rare earth element combination is europium and dysprosium mixed in a molar ratio of 1:1 to 1:3, with the doping ratio controlled at 0.5 mol% to 5 mol% to ensure the stability of the material's crystal structure and to achieve mechanoluminescence and long afterglow characteristics. The size design of the solid-state detection element 1 needs to consider the requirements of the actual application scenario. For example, when it is embedded in the wall, its diameter is usually 10mm-20mm and its length is 50mm-100mm to meet the requirements of stress transmission and optical signal output.

[0032] The high-temperature sintering process of the solid-state detection element 1 optimizes the mechanoluminescence properties and long afterglow characteristics of the material, while the end-face polishing treatment improves the stability and uniformity of the optical signal. The photoelectric acquisition module 2 efficiently captures the optical signal through the optical fiber 7 and uses a wireless transmission module to achieve remote monitoring and real-time analysis. The design of the fixing device 3 ensures the stability of the solid-state detection element 1 inside the wall, and the precise design of the optical fiber 7 wiring path avoids signal interruption problems caused by external pressure or damage.

[0033] The photoelectric acquisition module 2 includes an optical signal receiver, a signal processing unit, and a wireless transmission module. The photoelectric acquisition module 2 has an optical fiber interface on one side. The optical signal receiver is connected to one end of the optical fiber 7 through the optical fiber interface. The other end of the optical fiber 7 is connected and fixed to the polished side of the solid detection element 1 through an optical coupling agent. The optical signal receiver receives the optical signal transmitted by the optical fiber 7. The optical signal is transmitted to the signal processing unit for processing and then uploaded to the cloud platform through the wireless transmission module.

[0034] The optical fiber 7, which is installed between the solid detection element 1 and the photoelectric acquisition module 2, is arranged along a pre-set groove 8 inside the wall. The groove 8 has a depth of 10-20mm and a width of 5-10mm. A protective cover plate 9 is also installed on the groove 8, which completely covers the groove 8. The protective cover plate 9 has a thickness of 2-3mm and is made of polycarbonate. The installation of the groove 8 and the protective cover plate 9 prevents the optical fiber 7 from being squeezed or damaged by external forces, further enhancing the safety of the optical fiber 7 in use.

[0035] The two ends of the optical fiber 7 are connected to the solid-state detection element 1 and the photoelectric acquisition module 2 respectively through mechanical fasteners to ensure the stability of optical signal transmission. The optical fiber 7 is made of quartz material with a core diameter ranging from 200μm to 600μm and a numerical aperture of 0.22 to 0.37. This design meets the requirements for efficient optical signal transmission.

[0036] The solid-state detector 1 incorporates a 365nm ultraviolet LED that emits a pulse every 10 seconds to excite the strontium aluminate ceramic to produce a 512nm green afterglow. The ultraviolet LED is designed to be self-powered, powered by an internal micro-battery or energy harvesting device. When photons emitted by the ultraviolet LED irradiate the surface of the strontium aluminate ceramic, rare earth ions inside the ceramic are excited, electrons transition to higher energy levels, and subsequently release the 512nm green afterglow.

[0037] This afterglow phenomenon is characterized by its long duration and stable luminescence intensity, providing a foundation for subsequent stress monitoring. During the continuous weakening process, if mechanical stress is applied, it will trigger stress-enhanced luminescence, resulting in an enhanced luminescence phenomenon. When the wall is subjected to external loads, the stress is transmitted to the solid-state detection element 1 through the steel reinforcement frame, causing a slight change in its internal crystal lattice structure, electron transitions, and the release of photons, thereby generating mechanoluminescence. Under stress, the afterglow and mechanoluminescence work together to form an enhanced luminescence phenomenon. When the luminescence intensity exceeds a preset threshold, the system determines it as an abnormal signal and sends an alarm message through the wireless transmission module.

[0038] The photoelectric acquisition module 2 is connected to the solid-state detection element 1 via optical fiber 7, and is used to capture and upload optical signals to the cloud platform for analysis; such as Figure 3As shown, the photoelectric acquisition module 2 includes an optical signal receiver, a signal processing unit, and a wireless transmission module. The optical signal receiver is connected to one end of the optical fiber 7 via an optical fiber interface, while the other end of the optical fiber 7 is tightly pressed against the polished end face of the solid detection element 1 using an optical coupling agent (refractive index matching adhesive, such as silicone adhesive) to ensure an optical coupling efficiency greater than 90%, and is locked in position using mechanical fasteners. The signal processing unit has a built-in analog-to-digital converter to convert the optical signal into a digital signal and performs preliminary analysis based on a preset algorithm: setting the intensity threshold to 100lx to 500lx and the duration threshold to 10 seconds to 30 seconds; or using a simple machine learning model to identify stress accumulation trends. The wireless transmission module supports multiple communication protocols, such as LoRa, NB-IoT, or Wi-Fi, and can select the appropriate communication method according to the actual application scenario. It also has data encryption function to ensure the security of the transmission process.

[0039] Example 2

[0040] In practical applications, such as in the safety assessment of underground pipelines, the solid-state detection element 1 can be directly embedded in the concrete structure surrounding the pipeline. Through the above installation steps, the solid-state detection element 1 and the photoelectric acquisition module 2 are connected via optical fiber 7, and the optical signal can be transmitted to the ground monitoring center in real time. Since the working principle of the solid-state detection element 1 is based on mechanoluminescence and long afterglow characteristics, it has strong resistance to external electromagnetic interference and is suitable for complex underground environments. When the structure around the pipeline is subjected to external loads, the stress is transmitted to the solid-state detection element 1 through the concrete, causing a slight change in its internal lattice structure, electron transition and release of photons, thereby generating mechanoluminescence. Under stress, the afterglow and mechanoluminescence work together to form a luminescence enhancement phenomenon. When the luminescence intensity exceeds the preset threshold, the system determines it as an abnormal signal and sends alarm information through the wireless transmission module.

[0041] To verify the feasibility of this invention, a practical test was conducted in a construction project. The test scenario involved a load-bearing wall within a multi-story building, where multiple stress-coordinated afterglow luminescence ceramic smart detectors were pre-installed on the internal steel reinforcement frame. The solid-state detection element 1 of each detector was securely fixed to the steel reinforcement frame via a fixing device 3. An optical fiber 7 was arranged along a pre-designed groove 8 inside the wall and covered by a protective cover plate 9. During the test, the wall was simulated to be subjected to external loads of varying magnitudes, and the changes in the intensity of the light signal generated by the solid-state detection element 1 were observed. The experimental results showed that the solid-state detection element 1 accurately sensed the stress distribution inside the wall and transmitted the light signal to the photoelectric acquisition module 2 via the optical fiber 7, ultimately uploading it to a cloud platform for real-time monitoring and analysis. Furthermore, due to the long afterglow characteristic of the solid-state detection element 1, it could continue to emit a weak light signal even after the external load was removed, thus achieving passive, visualized long-term monitoring.

[0042] The advantages of this invention are particularly prominent in applications in concealed engineering projects. For example, in the safety assessment of underground pipelines, the solid-state detection element 1 can be directly embedded in the concrete structure around the pipeline without additional wiring or power supply. Through the connection of the optical fiber 7 and the photoelectric acquisition module 2, the optical signal can be transmitted to the ground monitoring center in real time, making it convenient for operators to keep abreast of the health status of the pipeline structure. In addition, since the working principle of the solid-state detection element 1 is based on mechanoluminescence and long afterglow characteristics, it has a strong resistance to external electromagnetic interference and is suitable for complex underground environments.

[0043] As can be seen from the above specific embodiments, the stress-coordinated afterglow luminescence strontium aluminate ceramic intelligent detector of this utility model has high feasibility and practicality in both structural design and practical application. Its core lies in utilizing the mechanoluminescence and long afterglow characteristics of strontium aluminate ceramic materials, combined with a reasonable design of the fixing device 3 and fiber optic cable 7, to achieve passive, visualized online monitoring of stress distribution inside building structures. This technical solution not only overcomes the limitations of traditional sensors that rely on external power supplies and complex circuits, but also solves the problems of difficult wiring and susceptibility to electromagnetic interference in concealed engineering, providing an innovative solution for building structure health monitoring and underground pipeline safety assessment.

[0044] This invention introduces strontium aluminate ceramic material with mechanoluminescence and long afterglow characteristics, combined with a reasonable design of the fixing device 3 and fiber optic cable 7, to achieve passive, visualized online monitoring of stress distribution within building structures. Specifically, the invention embeds a violet LED that emits pulsed light with a wavelength of 365nm every 10 seconds. Its energy is precisely sufficient to excite the strontium aluminate ceramic to produce a strong 512nm green afterglow. During the continuous weakening of the afterglow, if mechanical stress is applied, stress-enhanced luminescence will occur, resulting in increased luminescence intensity. When the detector detects that the luminescence intensity exceeds a preset threshold (e.g., 50%), it is determined to be an abnormal signal, and the signal is uploaded to the central control room via a wireless transmission module, triggering an alarm. This design not only overcomes the limitations of traditional sensors that rely on external power supplies and complex circuits, but also solves the problems of complex wiring and susceptibility to electromagnetic interference in concealed engineering projects, providing an innovative solution for building structural health monitoring and underground pipeline safety assessment. In addition, one end of the optical fiber 7 is coupled to the solid detection element 1, and the other end is arranged along the pre-set groove 8 in the wall and covered by the polycarbonate protective cover plate 9. It extends to the outside and connects with the photoelectric acquisition module 2. Finally, the detection signal is uploaded to the cloud platform through the wireless transmission module, which ensures the reliability and practicality of the system.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A stress-coordinated afterglow luminescence intelligent detector for strontium aluminate ceramics, characterized in that, The device includes a solid detection element, a photoelectric acquisition module, and a fixing device. One end of the fixing device is connected to the internal steel reinforcement frame of the wall, and the other end of the fixing device is equipped with a solid detection element. The solid detection element is connected to the photoelectric acquisition module through an optical fiber. The fixing device includes a base and an elastic clamping member. The elastic clamping member is provided on the end face of the base, and the solid detection element is disposed inside the elastic clamping member.

2. The strontium aluminate ceramic intelligent detector with stress-coordinated afterglow luminescence according to claim 1, characterized in that, The base has mounting holes at its four corners, and binding wires are installed in the mounting holes. The binding wires pass through the mounting holes to connect and fix the base to the internal steel reinforcement skeleton of the wall. The elastic clamp is an arc-shaped clamp. The bottom of the elastic clamp is fixed to the base by bolts, and the elastic clamp is perpendicular to the end face of the base.

3. The strontium aluminate ceramic intelligent detector with stress-coordinated afterglow luminescence according to claim 2, characterized in that, The base end face is provided with two elastic clamping members. The internal space of the elastic clamping members clamps and fixes the solid detection element. The inner side of the elastic clamping members is provided with a flexible pad layer with a thickness of 1mm-3mm. The flexible pad layer is made of silicone or polyurethane.

4. The strontium aluminate ceramic intelligent detector with stress-coordinated afterglow luminescence according to claim 1, characterized in that, The solid-state detection element has an embedded ultraviolet LED, the side of the solid-state detection element is polished, and the solid-state detection element is made of strontium aluminate ceramic material.

5. The strontium aluminate ceramic intelligent detector with stress-coordinated afterglow luminescence according to claim 4, characterized in that, The photoelectric acquisition module includes an optical signal receiver, a signal processing unit, and a wireless transmission module. The photoelectric acquisition module has an optical fiber interface on one side. The optical signal receiver is connected to one end of an optical fiber through the optical fiber interface. The other end of the optical fiber is fixed to the polished side of the solid-state detection element through an optical coupling agent. The optical signal receiver receives the optical signal transmitted by the optical fiber. The optical signal is transmitted to the signal processing unit for processing and then uploaded to the cloud platform through the wireless transmission module.

6. The strontium aluminate ceramic intelligent detector with stress-coordinated afterglow luminescence according to claim 5, characterized in that, The optical fiber between the solid detection element and the photoelectric acquisition module is arranged along a pre-set groove inside the wall. The groove is 10-20mm deep and 5-10mm wide. A protective cover plate is also provided on the groove, which completely covers the groove. The protective cover plate is 2-3mm thick and made of polycarbonate.

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