A micro-nano fiber three-dimensional force identification device based on composite force luminescent material

Abstract

The application provides a micro-nano fiber three-dimensional force recognition device based on composite force-induced luminescent material, relates to the technical field of sensor monitoring, and comprises an external force receiving end, a three-dimensional force structure decoupling end, composite force-induced luminescent material and a fluorescent signal acquisition module. The external force receiving end is used for receiving a three-dimensional force signal acted by the external environment and transmitting the force signal to subsequent structural units. The three-dimensional force structure decoupling end is used for decomposing the input three-dimensional force into local forces with spatial distribution differences. The composite force-induced luminescent material is used for converting mechanical force signals into different light signals and enhancing the light emission intensity through material synergistic effect. The fluorescent signal acquisition module is used for collecting, transmitting and outputting the force-induced luminescent signals for subsequent detection and recognition. The application avoids the rigid coupling mechanism of traditional three-dimensional force recognition devices subjected to light sources, can effectively distinguish forces in different directions and the sizes of the forces, and has the advantages of self-supplying light, resisting electromagnetic interference, simple design and the like.

Description

Technical Field

[0001] This invention relates to the field of sensor monitoring technology, and in particular to a micro-nano fiber optic three-dimensional force recognition device based on composite mechanoluminescent materials. Background Technology

[0002] In recent years, uniaxial force sensors have rapidly developed in fields such as wearable human health monitoring and human-computer interaction due to their advantages of simple structure, high sensitivity, and ease of integration, and have become an indispensable key component of intelligent sensing systems. These sensors primarily detect pressure or tension signals in a single direction to achieve high-precision physical information capture in tactile interaction scenarios, providing important technical support for the initial perception and control of human-computer collaborative systems.

[0003] However, with increasingly complex application scenarios, such as rehabilitation robots, bionic prostheses, and soft robots, which require real-time perception of multi-dimensional coupled mechanical information, traditional single-axis force sensors face significant bottlenecks in direction recognition and signal decoupling. To adapt to the measurement needs of complex force fields, multi-dimensional force sensors have gradually become a research hotspot. They have the ability to simultaneously detect multiple directional mechanical components, which can significantly improve the perception accuracy and adaptability of the system in dynamic interactive environments. Capacitive, piezoresistive, triboelectric, and fiber optic sensing are the current mainstream research directions. Each type is based on different physical signal conversion mechanisms and exhibits unique performance characteristics in terms of energy consumption and sensitivity range. Chen et al. proposed a flexible tactile sensor based on a magnetic cilia array. When the magnetic cilia bend under external force, the magnetic sensor array can detect the change in magnetic field, thereby obtaining the magnitude and direction of the external force. Wu et al. conducted biomimetic research on skin mechanoreceptors and developed a tactile sensor with the synergistic effect of piezoelectric and piezoresistive effects. Chou et al. proposed a flexible bionic hand sensor, which integrates whisker-like microstructures on the surface of the sensing membrane, realizing an integrated design that combines signal amplification and direction perception. While these multi-dimensional sensors have overcome the directional limitations of uniaxial force sensing, their fabrication process is complex, requiring intricate circuit structures. Especially in wearable applications, these sensors exhibit poor biocompatibility, and in actual measurements, the complex and variable external environment makes signal monitoring susceptible to interference. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention proposes a micro / nano fiber optic three-dimensional force recognition device based on composite mechanoluminescent materials, which can be applied to three-dimensional force recognition in the field of human-computer interaction.

[0005] The technical solution provided by this invention is: a micro-nano fiber optic three-dimensional force recognition device based on composite mechanoluminescent material, comprising: an external force receiving end, a three-dimensional force structure decoupling end, a composite mechanoluminescent material thin film, and a fluorescence signal acquisition module;

[0006] The external force receiving end is a hemispherical structure used to receive three-dimensional force signals from the outside world and transmit the force signals to subsequent structural units;

[0007] The three-dimensional force structure decoupling end includes a four-pyramid structure and a spring. The upper end of the spring is fixedly connected to the center of the bottom surface of the external force receiving end; the lower end of the spring is fixedly connected to the center of the upper surface of the composite force luminescent material film; the upper surface of the four-pyramid structure is fixed to the bottom surface of the external force receiving end; the four four-pyramid structures are equidistantly distributed along the circumference of the bottom surface of the external force receiving end.

[0008] The composite mechanoluminescent material film is used to convert mechanical force signals into different light signals and enhance the luminescence intensity through material synergy effects;

[0009] The fluorescence signal acquisition module is used to collect, transmit, and output mechanoluminescence signals for subsequent detection and identification.

[0010] The aforementioned four-pyramid structure comprises four symmetrically and equidistantly distributed pyramid-shaped support columns, which are used to convert external multidimensional forces into spatially distributed local pressures, concentrating the pressure on the composite mechanoluminescent film; thus achieving the differentiation of force signals in different directions; the spring is used to connect the external force receiving end and the composite mechanoluminescent material film, and under the action of no external force, the height of the spring keeps the four-pyramid structure and the composite mechanoluminescent material in a separated state.

[0011] The aforementioned composite mechanoluminescent material film is composed of two films, each film consisting of half SrAl2O4:Eu. 2+ Dy 3+ A single thin film, half of which is SrAl2O4:Eu 2+ Dy 3+ Composite films with ZnS:Cu:Al2O3 / SiO2; SrAl2O4:Eu 2+ Dy 3+ A single thin film is used to generate a mechanoluminescent signal with a first waveform characteristic; the SrAl2O4:Eu 2+ Dy 3+ The composite film with ZnS:Cu:Al2O3 / SiO2 generates a mechanoluminescence signal with a second waveform characteristic.

[0012] The aforementioned fluorescence signal acquisition module includes: two micro-nano optical fibers and a photon counting and detection device, wherein the photon counting and detection device is connected to the two micro-nano optical fibers; the two micro-nano optical fibers are used to transmit the mechanoluminescent signal generated by the composite mechanoluminescent material; and the photon counting and detection device is used to convert the optical signal into an electrical signal and transmit it to the terminal device.

[0013] The two micro-nano optical fibers mentioned above are embedded between the two films of the two-layer composite mechanoluminescent film. The two micro-nano optical fibers are biconical micro-nano optical fibers drawn from multimode optical fibers.

[0014] The above SrAl2O4:Eu 2+ Dy 3+ The single-film preparation method includes: mixing polydimethylsiloxane and methylvinylsiloxane at a molar ratio of 10:1 to form an elastic matrix, and then mixing the SrAl2O4:Eu... 2+ Dy 3+ SrAl2O4:Eu was added at a mass ratio of phosphor to elastic matrix of 1:2. 2+ Dy 3+ Fluorescent powder; microbubble defects were eliminated using a vacuum degassing process, and a 300μm thick fluid film was formed using coating technology. The film was then subjected to gradient thermosetting on a heating stage and cured at 80℃ for 30 min to obtain SrAl2O4:Eu 2+ Dy 3+ Thin film, completing SrAl2O4:Eu 2+ Dy 3+ Preparation of single thin films.

[0015] The above SrAl2O4:Eu 2+ Dy 3+ The preparation method of the composite film with ZnS:Cu:Al2O3 / SiO2 includes: mixing polydimethylsiloxane and methylvinylsiloxane at a molar ratio of 10:1 to form an elastic matrix, and then mixing SrAl2O4:Eu 2+ Dy 3+ A mixed material was obtained by mixing ZnS:Cu:Al2O3 / SiO2 particles at a mass ratio of 1:2. This mixed material was then incorporated into the polydimethylsiloxane elastic matrix at a mass ratio of 1:2. Microbubble defects were eliminated using a vacuum degassing process. A 300 μm thick fluid film was formed using coating technology. The film was then cured on a heating stage using gradient thermosetting at 80°C for 30 minutes to obtain a composite film, completing the SrAl2O4:Eu... 2+ Dy 3+ Preparation of composite films with ZnS:Cu:Al2O3 / SiO2.

[0016] The above scheme also includes a UV lamp; the UV lamp is used to irradiate the composite mechanoluminescent material film to charge it, with a power of 40W and a charging time of 5 minutes. After charging, it is left to stand for 2 minutes, and then a three-dimensional force recognition test is performed.

[0017] The beneficial effects of this invention are as follows: The micro-nano fiber optic three-dimensional force recognition device based on composite mechanoluminescent materials proposed in this invention is used for three-dimensional force recognition in human health monitoring and human-computer interaction. Its core utilizes a single europium-dysprosium co-doped strontium aluminate material, a europium-dysprosium co-doped strontium aluminate and copper-doped zinc sulfide mixed material, combined with a flexible mechanoluminescent sensing film constructed from polydimethylsiloxane, and two biconical micro-nano fibers and a four-cone-hemispherical coupling structure to achieve the detection and decoupling of triaxial forces. This method can distinguish the forces received by the robotic arm from different directions and their magnitudes in real time. This sensor has advantages such as self-powered operation, resistance to electromagnetic interference, and simple design. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the measurement structure according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the interaction point between the micro / nano optical fiber and the composite mechanoluminescent material in an embodiment of the present invention;

[0020] Figure 3 SrAl2O4:Eu in the composite mechanoluminescent material of this invention embodiment 2+ Dy 3+ A schematic diagram of the manufacturing process of a single thin film;

[0021] Figure 4 This is a schematic diagram of the experimental apparatus according to an embodiment of the present invention;

[0022] Figure 5 SrAl2O4:Eu 2+ Dy 3+ Simulation diagrams of particle distribution and optical field of ZnS and Mixed materials;

[0023] Figure 6 Simulation diagrams of frictional forces and force distribution for particles of the same but different sizes;

[0024] Figure 7 Figures showing the results of mechanoluminescence intensity tests for different material ratios;

[0025] Figure 8 This is a schematic diagram of signal transmission according to an embodiment of the present invention;

[0026] Among them, 1. External force receiving end; 2. Three-dimensional force structure decoupling end; 201. Four-pyramid structure; 202. Spring; 3. Composite mechanoluminescent material thin film; 301. Single film; 302. Composite film; 303. Ultraviolet lamp; 4. Fluorescent signal acquisition module; 401. Two micro-nano optical fibers; 402. Photon counting detection device. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited to the following embodiments. All equivalent substitutions, improvements and modifications made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0028] This embodiment proposes a micro / nano fiber optic three-dimensional force recognition device based on composite mechanoluminescent materials, such as... Figure 1 The diagram shown is a schematic of the three-dimensional force recognition device. Figure 1 From top to bottom, the components are the external force receiving end, the three-dimensional force structure decoupling end, the composite mechanoluminescent material thin film, and the fluorescence signal acquisition module.

[0029] The external force receiving end 1 is a hemispherical structure used to receive three-dimensional force signals from the outside and transmit the force signals to subsequent structural units; the center position of the lower end face of the external force receiving end 1 is fixedly connected to the center position of the upper end face of the composite force luminescent material film 2 by a spring 202.

[0030] The three-dimensional force structure decoupling end 2 includes a four-pyramid structure 201 and a spring 202. The upper end of the spring 202 is fixedly connected to the center of the bottom surface of the external force receiving end 1; the lower end of the spring 202 is fixedly connected to the center of the upper surface of the composite force luminescent material film 3; the spring 202 is used to connect the external force receiving end 1 and the composite force luminescent material film 3.

[0031] The four-pyramid structure 201 includes four symmetrically and equidistantly distributed pyramid-shaped support columns, which are used to convert external multidimensional forces into spatially distributed local pressures, concentrating the pressure on the composite mechanoluminescent film; thus achieving the differentiation of force signals in different directions; the upper end face of the four-pyramid structure 201 is fixed to the bottom end face of the external force receiving end 1; the four four-pyramid structures 201 are equidistantly distributed along the circumference of the bottom end face of the external force receiving end 1; under the action of no external force, the height of the spring 202 keeps the four-pyramid structure 201 separated from the composite mechanoluminescent material 3.

[0032] The composite mechanoluminescent material film 3 is used to convert mechanical force signals into different optical signals and enhance the luminescence intensity through material synergy effects; the composite mechanoluminescent material film 3 is composed of two films, each film being half SrAl2O4:Eu 2+ Dy 3+ Single thin film 301, half of which is SrAl2O4:Eu 2+ Dy 3+ Composite film 302 with ZnS:Cu:Al2O3 / SiO2;

[0033] The SrAl2O4:Eu 2+ Dy 3+A single thin film 301 is used to generate a mechanoluminescent signal with a first waveform characteristic; the SrAl2O4:Eu 2+ Dy 3+ The composite thin film 302 with ZnS:Cu:Al2O3 / SiO2 generates a mechanoluminescence signal with second waveform characteristics.

[0034] It also includes a UV lamp 303; the UV lamp 303 is used to irradiate the composite mechanoluminescent material film 3 to charge it with a power of 40W and a charging time of 5 minutes. After the charging is completed, it is left to stand for 2 minutes, and then a three-dimensional force recognition test is performed.

[0035] In this embodiment, three-dimensional force recognition is achieved by utilizing the coupling structure of a four-pyramid structure and an external force receiving hemispherical structure, as well as the mechanoluminescence characteristic wave pattern of composite mechanoluminescent material thin films made of different materials. For example... Figure 2 As shown, when a lateral force along the positive X-axis is applied to the top of the hemispherical structure at the force-receiving end, the hemispherical structure tilts to one side. The pyramid tip of the four-pyramid structure at position 2 experiences localized indentation under pressure, thus stimulating the mechanoluminescence effect. Meanwhile, the composite mechanoluminescent material films at the base of the other three four-pyramid structures show almost no deformation. Similarly, when a force is applied along the negative X-axis, the composite mechanoluminescent material film at position 1 deforms; when a force is applied along the positive Y-axis, the composite mechanoluminescent material film at position 3 deforms; and when a force is applied along the negative Y-axis, the composite mechanoluminescent material film at position 4 deforms.

[0036] The fluorescence signal acquisition module 4 is used to collect, transmit, and output the mechanoluminescence signal for subsequent detection and identification. The fluorescence signal acquisition module 4 includes two micro-nano optical fibers 401 and a photon counting detection device 402. The photon counting detection device 402 is connected to the two micro-nano optical fibers 401. The two micro-nano optical fibers 401 are used to transmit the mechanoluminescence signal generated by the composite mechanoluminescent material. The photon counting detection device 402 is used to convert the optical signal into an electrical signal and transmit it to a terminal device. The two micro-nano optical fibers 401 are embedded between the two films of the two-layer composite mechanoluminescent film 3, and the two micro-nano optical fibers 401 are biconical micro-nano optical fibers formed by drawing multimode optical fibers.

[0037] The two micro-nano optical fibers 401 are used to transmit the mechanoluminescent signal generated by the composite mechanoluminescent material film 3. The two micro-nano optical fibers 401 are standard multimode optical fibers with a core diameter of 62.5 μm and a cladding diameter of 125 μm. After the coating is stripped, they are prepared into a biconical structure by flame heating and stretching process, with a waist diameter of 2 μm and a waist length of 1 cm.

[0038] The optical signal reception process is as follows Figure 4 As shown, two micro / nano optical fibers 401 are located between two layers of composite mechanoluminescent thin films 3. Four pyramidal structures are symmetrically distributed above the composite mechanoluminescent material thin films 3. When the structures are subjected to external forces in different directions, the pyramidal structures excite the mechanoluminescence signal of the thin films, and the optical signal is coupled to the optical fibers through the micro / nano region. The optical signal transmission process is as follows: Figure 4 As shown, the optical signal is coupled into the micro-nano fiber, which transmits the optical signal to the PMT and CH297, and finally to the PC.

[0039] The SrAl2O4:Eu 2+ Dy 3+ The preparation method of single thin film 301 is as follows: Figure 3 As shown, it specifically includes:

[0040] Polydimethylsiloxane and methylvinylsiloxane were mixed at a molar ratio of 10:1 to form an elastic matrix PDMS, according to the SrAl2O4:Eu ratio. 2+ Dy 3+ SrAl2O4:Eu was added at a phosphor-to-matrix mass ratio of 1:2. 2+ Dy 3+ Powder, PDMS with SrAl2O4:Eu 2+ Dy 3+ The powder is mixed evenly according to the specified ratio. Figure 3 As shown in a; vacuum degassing process is used to eliminate microbubble defects, as shown in Figure a. Figure 3 As shown in b, the prepolymer is coated onto the mold as follows: Figure 3 As shown in c; a 300 μm thick fluid film was formed using coating technology, and then subjected to gradient thermosetting on a heating stage. After curing at 80 °C for 30 min, SrAl2O4:Eu was obtained. 2+ Dy 3+ Thin films such as Figure 3 As shown in d, the SrAl2O4:Eu 2+ Dy 3+ Preparation of a single thin film 301.

[0041] The SrAl2O4:Eu 2+ Dy 3+ The preparation method of composite thin film 302 with ZnS:Cu:Al2O3 / SiO2 includes:

[0042] Polydimethylsiloxane and methylvinylsiloxane were mixed in a 10:1 molar ratio to form an elastic matrix, and SrAl2O4:Eu 2+ Dy 3+ZnS:Cu:Al2O3 / SiO2 particles were mixed at a mass ratio of 1:2, and the mixture was then incorporated into a polydimethylsiloxane elastic matrix at a mass ratio of 1:2. Microbubble defects were eliminated using a vacuum degassing process, and a 300 μm thick fluid film was formed using coating technology. The film was then subjected to gradient thermosetting on a heating stage and cured at 80°C for 30 minutes to obtain a composite film, thus completing the SrAl2O4:Eu... 2+ Dy 3+ Preparation of composite thin film 302 with ZnS:Cu:Al2O3 / SiO2.

[0043] In this embodiment, the SrAl2O4:Eu composite mechanoluminescent material film 3 2+ Dy 3+ The phosphor exhibits ultra-long afterglow properties, continuing to emit light even after excitation ceases, with a working time of up to 24 hours. When SrAl2O4:Eu 2+ Dy 3+ When exposed to ultraviolet light, light waves of a certain energy are absorbed by the matrix and the luminescent center Eu. 2+ Absorbed, After absorbing energy, it transitions from the ground state to an excited state, and part of the excited state's Eu... 2+ Upon returning to the ground state, photoluminescence occurs, producing visible light in the 500–560 nm wavelength range; the remaining light is stored in Dy. 3+ The trap energy level is created. When mechanical force is applied to the material, the crystal is stressed and deformed, generating a piezoelectric field inside the crystal. This local electric field perturbs the trap energy level, reducing the trap's ability to bind electrons, thus releasing previously trapped electrons into the conduction band. Free electrons migrate in the conduction band, and when they encounter an ionized luminescent center, recombination occurs. The energy generated in the recombination process is transferred to Eu. 2+ This puts it into an excited state. When Eu 2+ When the excited state transitions back to the ground state, a mechanoluminescence effect occurs, emitting yellow-green light.

[0044] In this embodiment, to further enhance the mechanoluminescence signal intensity, this application uses SrAl2O4:Eu 2+ Dy 3+ A composite luminescent system is formed by introducing ZnS:Cu:Al2O3 / SiO2 particles into the system. ZnS particles have a high refractive index and good scattering characteristics, which can generate multiple light scattering effects inside the composite material, thereby extending the propagation path of photons in the material and improving the extraction efficiency of optical signals. Figure 5 In this context, 'a' represents SrAl2O4:Eu. 2+ Dy 3+ Distribution map of a single particle. Figure 5 In the diagram, b represents the distribution of a single ZnS particle. Figure 5 c in the equation is SrAl2O4:Eu 2+ Dy 3+ Distribution diagram of particles mixed with ZnS. Figure 5 d in SrAl2O4:Eu 2+ Dy 3+ Simulation of the light field of a single particle. Figure 5 In the figure, 'e' represents the simulated optical field of a single ZnS particle. Figure 5 f in the equation is SrAl2O4:Eu 2+ Dy 3+ Simulated light field diagram of a single particle. (In a particle containing only SrAl2O4:Eu) 2+ Dy 3+ In the particle system, the photon propagation path is relatively short, and the local light field distribution is relatively dispersed. However, after introducing ZnS particles, the photon propagation path increases significantly due to the multiple scattering effect, resulting in light intensity enhancement in some regions. Compared to the single-component system, the hybrid material system exhibits a higher light field intensity, indicating that ZnS particles can effectively enhance the light field distribution within the material, thereby improving the mechanoluminescence signal output intensity.

[0045] In this embodiment, SrAl2O4:Eu 2+ Dy 3+ The particle size ranges from 15-25 μm, while that of ZnS:Cu:Al2O3 ranges from 40-55 μm. Based on the influence of the particle size difference on mechanoluminescence properties, a particle contact mechanics model was established, and the contact stress distribution between particles of different sizes was simulated using finite element analysis. Figure 6 As shown in Figure a, two circular particle models with the same particle size (50 μm) were constructed, and longitudinal and transverse forces of 10 mN were applied to them, respectively. The simulation results of local forces are as follows. Figure 6 As shown in c, under the same particle size, the stress distribution in the particle contact area is relatively uniform. Subsequently, while keeping the magnitude of the external force constant, the particle size was set to 20 μm and 50 μm, as shown in Figure c. Figure 6 As shown in b in the figure. The force simulation results are as follows. Figure 6 As shown in d, under different particle sizes, a more pronounced stress concentration phenomenon occurs in the particle contact region. A larger stress gradient is beneficial for enhancing the local deformation of the crystal structure around the particles, thereby improving the mechanoluminescence excitation efficiency of the material.

[0046] In this embodiment, to determine the material ratio for achieving the optimal luminescence effect, a series of composite mechanoluminescent material films 3 with different mass ratios were prepared to investigate their luminescence intensity (SrAl2O4:Eu). 2+ Dy 3+The mass ratios of ZnS:Cu:Al2O3 to ZnS were set to 1:3, 1:2, 1:1, 2:1, 3:1, and 1:0, respectively. The mixed material was incorporated into polydimethylsiloxane at a ratio of 50 wt%, with an additional 2 wt% SiO2 added. A 62.5 μm diameter multimode optical fiber was embedded between two light-emitting layers, with the fiber output connected to a PMT for real-time acquisition of mechanoluminescence signals at the fiber end face. When the press probe contacted samples with different ratios, it triggered and generated mechanoluminescence pulse signals, which were collected by the optical fiber and transmitted to the detection system. Six sets of sensors corresponding to different gradient ratio combinations were mounted on an electric platform and subjected to impact under a constant pressure of 20 N. Figure 7 (a) is a line graph showing the average peak values ​​of six different ratios, and (b) is a graph showing the average peak values ​​of SrAl2O4:Eu. 2+ Dy 3+ The test results for the sample with a ZnS:Cu:Al2O3 mass ratio of 1:3, (c) is SrAl2O4:Eu 2+ Dy 3+ The test results for the sample with a ZnS:Cu:Al2O3 mass ratio of 1:2, (d) is SrAl2O4:Eu 2+ Dy 3+ The test results for the sample with a ZnS:Cu:Al2O3 mass ratio of 1:1, (e) is SrAl2O4:Eu 2+ Dy 3+ The test results for the sample with a ZnS:Cu:Al2O3 mass ratio of 2:1, (f) is for SrAl2O4:Eu 2+ Dy 3+ The test results for the sample with a ZnS:Cu:Al2O3 mass ratio of 3:1, (g) are SrAl2O4:Eu 2+ Dy 3+ Test results for a sample with a ZnS:Cu:Al2O3 mass ratio of 1:0. The results show that the optimal gradient ratio of the mixed material is determined to be SrAl2O4:Eu. 2+ Dy 3+ The mass ratio of ZnS:Cu:Al2O3 to ZnS:Cu:Al2O3 is 1:2.

Claims

1. A micro / nano fiber optic three-dimensional force recognition device based on composite mechanoluminescent materials, characterized in that, include: External force receiving end (1), three-dimensional force structure decoupling end (2), composite mechanoluminescent material thin film (3) and fluorescence signal acquisition module (4); The external force receiving end (1) is a hemispherical structure used to receive three-dimensional force signals from the outside and transmit the force signals to subsequent structural units; The three-dimensional force structure decoupling end (2) includes a four-pyramid structure (201) and a spring (202). The upper end of the spring (202) is fixedly connected to the center of the bottom surface of the external force receiving end (1); the lower end of the spring (202) is fixedly connected to the center of the upper surface of the composite force luminescent material film (3); the upper surface of the four-pyramid structure (201) is fixed to the bottom surface of the external force receiving end (1); the four four-pyramid structures (201) are equidistantly distributed along the circumference of the bottom surface of the external force receiving end (1). The composite mechanoluminescent material film (3) is used to convert mechanical force signals into different light signals and enhance the luminescence intensity through material synergy effect; The fluorescence signal acquisition module (4) is used to collect, transmit and output the mechanoluminescence signal for subsequent detection and identification; The composite mechanoluminescent material film (3) is composed of two films, each film being half SrAl2O4:Eu. 2+ Dy 3 + A single thin film (301), half of which is SrAl2O4:Eu 2+ Dy 3+ Composite thin film (302) with ZnS:Cu:Al2O3 / SiO2; SrAl2O4:Eu 2+ Dy 3+ A single thin film (301) is used to generate a mechanoluminescent signal with first waveform characteristics; the SrAl2O4:Eu 2+ Dy 3+ The composite film (302) with ZnS:Cu:Al2O3 / SiO2 generates a mechanoluminescence signal with a second waveform characteristic.

2. The micro / nano fiber optic three-dimensional force recognition device based on composite mechanoluminescent materials according to claim 1, characterized in that: The four-pyramid structure (201) includes four symmetrically and equidistantly distributed pyramid-shaped support columns, which are used to convert external multidimensional forces into spatially distributed local pressures, and concentrate the pressure on the composite force-luminescent thin film; thus realizing the differentiation of force signals in different directions. The spring (202) is used to connect the external force receiving end (1) and the composite mechanoluminescent material film (3). When no external force is applied, the height of the spring (202) keeps the four-pyramid structure (201) and the composite mechanoluminescent material film (3) separated.

3. The micro / nano fiber optic three-dimensional force recognition device based on composite mechanoluminescent materials according to claim 1, characterized in that, The fluorescence signal acquisition module (4) includes: two micro-nano optical fibers (401) and a photon counting detection device (402). The photon counting detection device (402) is connected to the two micro-nano optical fibers (401). The two micro-nano optical fibers (401) are used to transmit the mechanoluminescent signal generated by the composite mechanoluminescent material. The photon counting detection device (402) is used to convert the optical signal into an electrical signal and transmit it to the terminal device.

4. The micro / nano fiber optic three-dimensional force recognition device based on composite mechanoluminescent materials according to claim 3, characterized in that, The two micro-nano optical fibers (401) are embedded between the two films of the two-layer composite mechanoluminescent material film (3). The two micro-nano optical fibers (401) are biconical micro-nano optical fibers formed by drawing multimode optical fibers.

5. The micro / nano fiber optic three-dimensional force recognition device based on composite mechanoluminescent materials according to claim 1, characterized in that, The SrAl2O4:Eu 2+ Dy 3+ The preparation method of the single thin film (301) includes: Polydimethylsiloxane and methylvinylsiloxane were mixed at a molar ratio of 10:1 to form an elastic matrix, according to the SrAl2O4:Eu... 2+ Dy 3+ SrAl2O4:Eu was added at a mass ratio of phosphor to elastic matrix of 1:

2. 2+ Dy 3+ Fluorescent powder; microbubble defects were eliminated using a vacuum degassing process, and a 300μm thick fluid film was formed using coating technology. The film was then subjected to gradient thermosetting on a heating stage and cured at 80℃ for 30 min to obtain SrAl2O4:Eu 2+ Dy 3+ Thin film, completing SrAl2O4:Eu 2+ Dy 3+ Preparation of a single thin film (301).

6. The micro / nano fiber optic three-dimensional force recognition device based on composite mechanoluminescent materials according to claim 1, characterized in that, The SrAl2O4:Eu 2+ Dy 3+ The preparation method of the composite thin film (302) with ZnS:Cu:Al2O3 / SiO2 includes: Polydimethylsiloxane and methylvinylsiloxane were mixed in a 10:1 molar ratio to form an elastic matrix, and SrAl2O4:Eu 2+ Dy 3+ A mixed material was obtained by mixing ZnS:Cu:Al2O3 / SiO2 particles at a mass ratio of 1:

2. This mixed material was then incorporated into the polydimethylsiloxane elastic matrix at a mass ratio of 1:

2. Microbubble defects were eliminated using a vacuum degassing process. A 300 μm thick fluid film was formed using coating technology. The film was then cured on a heating stage using gradient thermosetting at 80°C for 30 minutes to obtain a composite film, completing the SrAl2O4:Eu... 2+ Dy 3+ Preparation of composite thin film (302) with ZnS:Cu:Al2O3 / SiO2.

7. The micro / nano fiber optic three-dimensional force recognition device based on composite mechanoluminescent materials according to claim 1, characterized in that, It also includes a UV lamp (303); the UV lamp (303) is used to irradiate the composite mechanoluminescent material film (3) to charge it with a power of 40W and a charging time of 5 minutes. After the charging is completed, it is left to stand for 2 minutes, and then a three-dimensional force recognition test is performed.

Images