Flexible dual-mode sensor with arch and motion detection functions

Abstract

The invention relates to the field of flexible sensing, and discloses a flexible dual-mode sensor with a foot arch and motion detection function, the flexible dual-mode sensor comprises an upper substrate, a lower substrate, an electrode layer, a conductive pin, a PVDF doped BTO-NPs nanofiber film and a PVDF doped ionic salt solution nanofiber film, the upper substrate and the lower substrate are polyimide films (PI), the electrode layer is an immersion gold (Au) pad, and the conductive pin is arranged on the electrode layer. The conductive pin is formed by fixing a copper wire on the electrode plate through silver paste, the nanofiber membrane is obtained by PVDF doped BTO-NPs and PVDF doped ionic salt electrostatic spinning, the gold immersion (Au) bonding pad membrane is designed on the PI substrate to form polar plates and electrodes of the capacitive sensor and the piezoelectric sensor, and the electrode plate is led out through the copper wire to serve as the conductive pin. According to the flexible dual-mode sensor, the flexible PI in a specific shape is prepared to serve as the upper substrate and the lower substrate of the flexible dual-mode sensor, and the gold immersion (Au) bonding pad films are designed on the PI substrates, so that the flexible sensor has flexibility and ductility and is more attached to surfaces with different curvatures.

Description

Technical Field

[0001] The present invention relates to the field of flexible sensing, and particularly to a preparation method of a flexible dual-mode sensor with both arch and motion detection functions and the detection of arch types. Background Art

[0002] In recent years, flexible sensors have received increasing attention and shown great application prospects in fields such as electronic skin and wearable devices. Researchers at home and abroad have successfully prepared various flexible sensors using different materials and processes. However, the limitations of single sensor types are obvious. Traditional piezoresistive sensors perform well in static pressure detection, but have low sensitivity to dynamic signals and are difficult to capture rapidly changing electrical information. Piezoelectric sensors, although having advantages in dynamic pressure detection, cannot sense static pressure. This separation of static and dynamic information makes it difficult for a single sensor to meet the comprehensive detection requirements of complex plantar force conditions.

[0003] Secondly, the structural rigidity problem of sensors is also worthy of attention. Many traditional rigid sensors are prone to environmental interference and mechanical damage in practical applications, resulting in a decrease in accuracy after long-term use and being difficult to adapt to complex and dynamic plantar force environments. In addition, the rigid structure does not match the flexible contact surface of the human body, which may lead to a decrease in comfort and affect the user experience.

[0004] In addition, the fusion and analysis of multi-modal data are still a technical difficulty. The plantar force process is usually a complex process in which static and dynamic signals occur alternately. How to effectively fuse the data collected by multi-modal sensors to achieve high-precision analysis of plantar force information and extraction of plantar morphological features still requires in-depth research. Summary of the Invention

[0005] In order to overcome the above existing phenomena, the present invention provides a preparation method and application of a flexible dual-mode sensor with both arch and motion detection functions, and prepares a flexible dual-mode sensor with both arch and motion detection functions, including a capacitive sensor and a piezoelectric sensor. By applying a special plate structure of the flexible dual-mode sensor to the insole, the sensor judges whether to start collecting arch detection data through the piezoelectric sensing element, avoiding invalid detection when not stationary. The capacitive sensor collects pressure data at different parts of the arch, converts it into a capacitance change rate, and obtains the arch angle through deep learning decoupling to accurately evaluate the arch type.

[0006] To achieve the above object, the present invention adopts the following technical solution: A flexible dual-mode sensor with both arch and motion detection functions, comprising upper and lower substrates, an electrode layer, conductive pins, a PVDF-doped BTO-NPs nanofiber film, and a PVDF-doped ionic salt solution nanofiber film;

[0007] The upper and lower substrates are polyimide films (PI), the electrode layer has an immersion gold (Au) pad, the conductive pin is a copper wire fixed to the electrode plate with silver paste, and the nanofiber membrane is obtained by electrospinning PVDF doped with BTO-NPs and PVDF doped with ionic salt.

[0008] As a further description of the above technical solution:

[0009] The immersion gold (Au) pad film is designed on the PI substrate to form the plates and electrodes of the capacitive sensor and the piezoelectric sensor, and a copper wire is led out on the electrode plate as a conductive pin.

[0010] As a further description of the above technical solution:

[0011] The PVDF doped with BTO-NPs nanofiber membrane and the PVDF doped with ionic salt solution nanofiber thin film are obtained by electrospinning, and then cut into a specific shape as the dielectric layer and the piezoelectric layer of the capacitive sensor and the piezoelectric sensor.

[0012] As a further description of the above technical solution:

[0013] The flexible dual-mode sensor is obtained by encapsulating in the order of the lower substrate, the nanofiber membrane, and the upper substrate.

[0014] A preparation method of a flexible dual-mode sensor with both arch and motion detection functions specifically includes the following steps:

[0015] ① Weigh 1.5 - 2.0 g of PVDF and dissolve it in a mixed solution of 8 - 12 g of dimethylformamide (DMF) and acetone (AC) (V:V = 3:1). Stir in a water bath at 60 °C for 4 h, and add 0 - 3 wt% of BTO-NPs to it. Stir at room temperature for 24 h. After stirring evenly, load it into a syringe (20 ml) and electrospin at 17 - 20 KV, temperature 28 - 32 °C, humidity 50%, and a rate of 0.5 - 1.0 ml / h for 3 - 5 h to obtain a layer of PVDF doped with BTO-NPs nanofiber membrane (4);

[0016] ② Weigh 1.5 - 2.0 g of PVDF and dissolve it in a mixed solution of 8 - 12 g of dimethylformamide (DMF) and acetone (AC) (V:V = 3:1). Stir in a water bath at 60 °C for 4 h, and add 0 - 0.4 g of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIM]TF2N) to it. Stir at room temperature for 14 h. After stirring evenly, load it into a syringe (20 ml) and electrospin at 17 - 20 KV, temperature 30 °C, humidity 50%, and a rate of 0.5 - 1.0 ml / h for 3 - 5 h to obtain a layer of PVDF doped with [BMIM]TF2N nanofiber membrane (5);

[0017] ③ Design a capacitive electrode layer and a piezoelectric electrode layer with special shapes and use the immersion gold (Au) technology to design them on a PI substrate;

[0018] ④ Use silver paste to fix the copper wire to the electrode plate, and encapsulate it in the order of the lower substrate, PVDF doped with BTO-NPs nanofiber film and PVDF doped with [BMIM]TF2N nanofiber film, and the upper substrate to obtain a flexible dual-mode sensor

[0019] As a further description of the above technical solution:

[0020] The flexible dual-mode sensor is mainly used for arch type detection and motion state monitoring. The sensor adopts a special electrode plate structure design and is integrated into the insole. The piezoelectric sensor is used as a data acquisition switch to judge the appropriate timing for collecting arch data, so as to avoid collecting invalid data in a non-static state. At the same time, the capacitive sensor uses the STM32F103C8T6 main control chip and the FDC2214 capacitive signal acquisition chip to achieve precise signal acquisition and processing, and transmits the data to an external device through a serial port. By using deep learning algorithms to decouple the collected signals, arch angles, motion parameters and three-dimensional force information can be obtained, so as to accurately evaluate the plantar morphology (including but not limited to flat feet, normal feet and high arches) and motion performance. The sensor is made of flexible materials, can adapt to different foot types, provides high-precision and real-time health monitoring data, and is widely used in the fields of sports medicine, foot health management, sports injury prevention, etc.

[0021] As a further description of the above technical solution:

[0022] The acceleration and velocity change signals output by the piezoelectric sensor not only reflect the changes of the sole during dynamic movement, but also capture the force information of the sole in the X, Y, and Z directions; while the vertical pressure distribution signal detected by the capacitive sensor supplements the static pressure data. Presenting the two groups of signals through a visual data graph can generate a plantar morphology detection signal graph, a motion state monitoring graph and a three-dimensional force distribution graph, and compare them with the normal plantar morphology and motion reference standard graph, so as to comprehensively reflect the plantar morphology characteristics and motion state of the user, including the judgment of flat feet, high arches and abnormal gaits, and at the same time achieve precise detection of the three-dimensional force state of the sole.

[0023] The present invention has the following beneficial effects:

[0024] 1. In the present invention, by preparing a flexible PI with a specific shape as the upper and lower substrates of the flexible dual-mode sensor, and designing the gold-immersed (Au) pad film on the PI substrate, the flexible sensor has flexibility and ductility, can fully adapt to the fitting requirements of different curvature surfaces, and thus realizes precise positioning and comfortable wearing.

[0025] 2. In the present invention, by preparing the PVDF-doped BTO-NPs composite nanofiber membrane, the piezoelectric coefficient of the material is effectively improved, thereby significantly enhancing the response sensitivity of the sensor to dynamic load changes and providing a solid foundation for high-precision dynamic detection.

[0026] 3. In the present invention, by preparing the PVDF-doped [BMIM]TF2N composite nanofiber membrane, the capacitance change rate is improved through the double-layer effect, and the capacitance performance is enhanced.

[0027] 4. In the present invention, the PVDF-doped BTO-NPs nanofiber membrane and the PVDF-doped [BMIM]TF2N nanofiber membrane prepared are a kind of thin film formed by countless nanoscale fiber filaments. Its unique network structure ensures good air permeability of the material, thus significantly improving the user's comfort during long-term wearing and being suitable for daily health monitoring scenarios.

[0028] 5. In the present invention, through the collaborative work of the electrical sensor and the capacitance sensor, the synchronous acquisition of plantar static pressure and dynamic motion information is realized. Through the deep learning algorithm, the multi-dimensional data is decoupled and processed to accurately obtain the arch angle and plantar morphology data, providing a scientific basis for detecting abnormalities such as flat feet and high arches.

[0029] 6. In the present invention, the piezoelectric sensor collects the force information in the X, Y, and Z directions, and the capacitance sensor collects the vertical pressure distribution. The two generate a detailed three-dimensional force distribution map and a motion state monitoring map through data fusion and visualization processing, comprehensively reflecting the plantar force and motion state of the user, and further improving the accuracy of sports injury prevention and rehabilitation guidance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram of a flexible dual-mode sensor with both arch and motion detection functions of the present invention;

[0031] Figure 2 is a schematic diagram of the conductive pins fixed on the electrode plate;

[0032] Figure 3 is a scanning electron microscope image of the PVDF-doped BTO-NPs nanofiber membrane;

[0033] Figure 4It is the scanning electron microscope image of the PVDF-doped [BMIM]TF2 nanofiber membrane;

[0034] Figure 5 It is the schematic diagram of the insole installation of the flexible dual-mode sensor;

[0035] Figure 6 It is the capacitance signal acquisition diagram of the flexible dual-mode sensor under different axial forces;

[0036] Figure 7 It is the capacitance signal acquisition diagram of the flexible dual-mode sensor under different angular forces;

[0037] Figure 8 It is the piezoelectric and capacitance signal acquisition diagram of the flexible dual-mode sensor for normal feet;

[0038] Figure 9 It is the piezoelectric and capacitance signal acquisition diagram of the flexible dual-mode sensor for flat feet. Specific embodiments

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] Embodiment 1

[0041] The present invention provides a flexible dual-mode sensor with both arch and motion detection functions. Please refer to Figure 1 、 Figure 2 , which includes upper and lower substrates 1, electrode layer 2, conductive pins 3, PVDF-doped BTO-NPs nanofiber thin film 4, and PVDF-doped ionic salt solution nanofiber thin film 5. The upper and lower substrates 1 are polyimide films (PI). The electrode layer 2 has immersion gold (Au) pads. The conductive pins 3 are copper wires fixed to the electrode plate through silver paste. The nanofiber membranes are obtained by electrospinning PVDF-doped BTO-NPs and PVDF-doped ionic salts. The immersion gold (Au) pad film is designed on the PI substrate 1 to form the plates and electrodes of the capacitive sensor and the piezoelectric sensor, and copper wires are led out on the electrode plate as the conductive pins 3. The PVDF-doped BTO-NPs nanofiber film 4 and the PVDF-doped ionic salt solution nanofiber thin film are obtained by electrospinning, and then cut into specific shapes as the dielectric layer and piezoelectric layer of the capacitive sensor and the piezoelectric sensor, and are encapsulated in the order of the lower substrate 1, nanofiber film 4, and upper substrate 1 to obtain the flexible dual-mode sensor.

[0042] Furthermore, please refer to Figure 3, The scanning electron microscope image of the PVDF-doped BTO-NPs nanofiber membrane clearly shows that the BTO NPs are evenly distributed in the composite piezoelectric thin film fibers without agglomeration and stress concentration problems, thus ensuring the good flexibility of the thin film.

[0043] Furthermore, please refer to Figure 4 , The scanning electron microscope image of the PVDF-doped [BMIM]TF2 nanofiber membrane shows that the ionic salt has been successfully doped into the fibers and is evenly distributed within the fibers, providing a stable material basis for the capacitance signal acquisition of the sensor. Further, graphene nanosheets (Graphene) or carbon nanotubes (CNTs) are introduced into PVDF to improve the conductivity and mechanical strength of the sensor. In addition, other high-performance piezoelectric materials, such as lead zirconate titanate (PZT) or potassium sodium niobate (KNN), are explored to further enhance the piezoelectric response performance. And vacuum encapsulation technology or flexible encapsulation materials, including but not limited to polydimethylsiloxane, PDMS, are used to encapsulate the sensor. Additionally, an anti-interference layer, such as an electromagnetic shielding layer, is added during the encapsulation process to reduce the interference of external electromagnetic signals on the sensor data.

[0044] Example 2

[0045] Based on Example 1, the present invention also provides a preparation method for a flexible dual-mode sensor with both arch and motion detection functions, which specifically includes the following steps:

[0046] ① Weigh 1.8 g of PVDF and dissolve it in a mixed solution of 10 g of dimethylformamide (DMF) and acetone (AC) (V:V = 3:1). Stir it in a water bath at 60 °C for 4 h, and add 1 wt% of BTO-NPs to it. Stir it at room temperature for 24 h. After stirring evenly, load it into a syringe (20 ml) and electrospin for 4 h at 18 kV, a temperature of 30 °C, a humidity of 50%, and a rate of 0.8 ml / h to obtain a layer of PVDF-doped BTO-NPs nanofiber membrane 4;

[0047] ② Weigh 1.8 g of PVDF and dissolve it in a mixed solution of 10 g of dimethylformamide (DMF) and acetone (AC) (V:V = 3:1). Stir it in a water bath at 60 °C for 4 h, and add 0.1 g of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIM]TF2N) to it. Stir it at room temperature for 24 h. After stirring evenly, load it into a syringe (20 ml) and electrospin for 4 h at 18 kV, a temperature of 30 °C, a humidity of 50%, and a rate of 0.8 ml / h to obtain a layer of PVDF-doped [BMIM]TF2N nanofiber membrane 5;

[0048] ③ Design a capacitive electrode layer and a piezoelectric electrode layer with special shapes and use the immersion gold (Au) technology to design on the PI substrate 1;

[0049] ④ Fix the copper wire to the electrode plate 2 using silver paste, and encapsulate in the order of the lower substrate 1, the PVDF-doped BTO-NPs nanofiber film 4, and the PVDF-doped [BMIM]TF2N nanofiber film 5, and the upper substrate (1) to obtain a flexible dual-mode sensor.

[0050] Example 3

[0051] Based on Example 1 and Example 2, the present invention also provides an application of a flexible dual-mode sensor with both arch and motion detection functions. The flexible dual-mode sensor is mainly used for arch type detection. By applying a specially designed plate structure of the flexible dual-mode sensor to the insole, the piezoelectric sensor is used as a detection switch to judge whether to start collecting arch data, avoiding invalid detection when not stationary. The capacitive sensor realizes signal acquisition and processing through the STM32F103C8T6 main control chip and the FDC2214 capacitive signal acquisition chip, and conducts data transmission with external devices through the serial port. The arch angle is obtained by deep learning decoupling, and the plantar morphology (such as flat feet, normal feet, etc.) is accurately evaluated to give health feedback. The sensor uses flexible materials, can adapt to different foot types, provides high-precision and real-time health monitoring data, and is widely used in the fields of sports medicine and foot health management, etc.

[0052] Further, please refer to Figure 5 , Figure 5 As a whole, it is the installation schematic diagram of the insole of the flexible dual-mode sensor. The structure adopts a V-shaped type. The immersion gold pads are designed as the upper and lower sensing electrodes of the sensor according to the electrode parameters of the dual-mode sensor, and the pluggable gold finger interface is integrated on the edge of the board to realize data transmission. The local lamination of a polyimide (PI) reinforcement sheet (thickness 0.2 mm) in the pluggable gold finger area strengthens its stability and improves the plugging life.

[0053] Further, please refer to Figure 6 , Figure 6 It is the capacitive signal acquisition diagram of the flexible dual-mode sensor under different axial forces. Using a mechanical testing machine, a stress of 0-1 N is applied to the capacitive three-dimensional force sensor on the X, Y, and Z axes at a speed of 80 mm / min, and three-dimensional force calibration is performed on the X, Y, and Z axes of the sensor respectively.

[0054] Further, please refer to Figure 7 , Figure 7 It is the capacitive signal acquisition diagram of the flexible dual-mode sensor under different angular forces. Under the condition of applying the same normal force, as the angle of the test platform gradually increases, the relative capacitance change rate output by each unit of the sensor gradually decreases, which verifies the excellent detection ability of the capacitive three-dimensional force sensor for spatial three-dimensional forces.

[0055] Furthermore, the acceleration and velocity change signals output by the piezoelectric sensor are combined with the pressure distribution signals output by the capacitance sensor for analysis, and the two groups of signals are presented through a visual data graph to generate a plantar morphology detection signal graph. The plantar morphology detection signal graph is compared with a normal plantar morphology reference standard graph to further reflect the plantar morphology characteristics of the user, including the judgment of flat feet or high arches. Further, please refer to Figure 8 、 Figure 9 , Figure 8 、 Figure 9 Figures and are the piezoelectric and capacitance signal acquisition graphs of the flexible dual-mode sensor for normal feet and flat feet, respectively. The subject steps on the arch array detection electrode with a certain pressure and keeps it for a period of time, and then the sole leaves the detection electrode. During this process, the sensor will collect its piezoelectric and capacitance signals in real time.

[0056] Furthermore, a convolutional neural network (CNN) or long short-term memory network (LSTM) based on deep learning is introduced to perform fusion analysis on the data collected by the piezoelectric sensor and the capacitance sensor, develop a real-time data processing algorithm, combine the sensor data with cloud computing to realize real-time monitoring and feedback of the plantar force condition, and develop a supporting mobile application, that is, the relevant APP, to visualize the data collected by the sensor and provide personalized health management suggestions, such as recommending suitable insoles or sports shoes, providing suggestions for adjusting sports postures, adding social functions, enabling users to share data and communicate health management experiences with others.

[0057] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flexible dual-mode sensor with both arch and motion detection functions, characterized in that: It consists of an upper and lower substrate (1), an electrode layer (2), conductive pins (3), a PVDF-doped BTO-NPs nanofiber film (4), and a PVDF-doped ionic salt solution nanofiber film (5). The upper and lower substrate (1) is a polyimide film (PI), the electrode layer (2) has an immersion gold (Au) pad, the conductive pins (3) are copper wires fixed to the electrode plate with silver paste, and the nanofiber film is obtained by electrospinning PVDF-doped BTO-NPs and PVDF-doped ionic salt.

2. The flexible dual-mode sensor with both arch and motion detection functions according to claim 1, characterized in that: The immersion gold (Au) pad film is designed on the PI substrate (1) to form the plates and electrodes of the capacitive sensor and the piezoelectric sensor, and copper wires are led out on the electrode plate as conductive pins (3).

3. A flexible dual-mode sensor with both arch and motion detection functions according to claim 1, characterized in that: The PVDF-doped BTO-NPs nanofiber film (4) and the PVDF-doped ionic salt solution nanofiber film are obtained by electrospinning, and then cut into a specific shape as the dielectric layer and piezoelectric layer of the capacitive sensor and the piezoelectric sensor.

4. The flexible dual-mode sensor with arch and motion detection functions according to claim 1, characterized in that : The PVDF-doped BTO-NPs nanofiber film and the PVDF-doped ionic salt solution nanofiber film are both disposed on the flexible substrate and arranged in a coplanar manner to realize the integration of the piezoelectric sensor unit and the capacitive sensor unit in the same plane, facilitating the synchronous detection of dynamic and static force information on the sole of the foot. The overall thickness of the sensor is low, and the flexibility and foot sole conformability of the sensor are enhanced, enabling it to bend with the insole and deform with the natural movement of the foot, thereby improving the accuracy of data collection.

5. The flexible dual-mode sensor with both arch and motion detection functions according to claim 2, wherein: The flexible dual-mode sensor is obtained by encapsulating in the order of the lower substrate (1), the nanofiber film (4), and the upper substrate (1).

6. A preparation method of a flexible dual-mode sensor with both arch and motion detection functions according to any one of claims 1-5, characterized in that: Specifically, it includes the following steps: ① Weigh 1.5 - 2.0 g of PVDF and dissolve it in a mixed solution of 8 - 12 g of dimethylformamide (DMF) and acetone (AC) (V:V = 3:1). Stir in a water bath at 60 °C for 4 h, and add 0 - 3 wt% of BTO-NPs to it. Stir at room temperature for 24 h. After stirring evenly, load it into a syringe (20 ml). Electrospin at a voltage of 17 - 20 KV, a temperature of 28 - 32 °C, a humidity of 50%, and a rate of 0.5 - 1.0 ml / h for 3 - 5 h to obtain a layer of PVDF-doped BTO-NPs nanofiber film (4); ② Weigh 1.5 - 2.0 g of PVDF and dissolve it in a mixed solution of 8 - 12 g of dimethylformamide (DMF) and acetone (AC) (V:V = 3:1). Stir in a water bath at 60 °C for 4 h, and add 0 - 0.4 g of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIM]TF2N) to it. Stir at room temperature for 14 h. After stirring evenly, load it into a syringe (20 ml). Electrospin at a voltage of 17 - 20 KV, a temperature of 30 °C, a humidity of 50%, and a rate of 0.5 - 1.0 ml / h for 3 - 5 h to obtain a layer of PVDF-doped [BMIM]TF2N nanofiber film (5); ③ Design special-shaped capacitive electrode layers and piezoelectric electrode layers using the immersion gold (Au) technology on the PI substrate (1); ④Fix the copper wire to the electrode plate (2) using silver paste, and encapsulate to obtain a flexible dual-mode sensor in the order of the lower substrate (1), the PVDF-doped BTO-NPs nanofiber film (4), and the PVDF-doped [BMIM]TF2N nanofiber film (5), and the upper substrate (1).

7. Application of a flexible dual-mode sensor with both arch and motion detection functions according to any one of claims 1-6, characterized in that: The flexible dual-mode sensor is mainly used for arch type detection and motion monitoring. By designing the sensor into an insole with a special electrode plate structure and using a piezoelectric sensor as a detection switch to determine the timing of data acquisition, it can effectively distinguish between static and dynamic states and avoid invalid data acquisition during non-stationary periods. At the same time, the capacitance sensor realizes signal acquisition and processing through the STM32F103C8T6 main control chip and the FDC2214 capacitance signal acquisition chip, and transmits data to external devices through a serial port. Through deep learning algorithm decoupling, the arch angle and motion parameters are obtained, so as to accurately evaluate the plantar morphology (including but not limited to flat feet, normal feet, high arches, etc.) and motion state, and provide health feedback. The sensor uses flexible materials to adapt to different foot types, can provide high-precision and real-time health and motion monitoring data, and is widely used in the fields of sports medicine, foot health management, and sports injury prevention.

8. The application of a flexible dual-mode sensor with both arch and motion detection functions according to claim 6, characterized in that: In addition to outputting signals of acceleration and speed changes, the piezoelectric sensor also outputs signals reflecting the force information of the sole in the X, Y, and Z directions. Combined with the vertical pressure distribution signals detected by the capacitance sensor, a plantar morphology detection map, a motion state monitoring map, and a three-dimensional force distribution map are respectively generated through a visual data graph. Among them, the capacitance sensor is used to detect the pressure distribution in the vertical direction, while the piezoelectric sensor captures horizontal shear force and dynamic acceleration signals to realize comprehensive monitoring of the three-dimensional force state of the sole, and compares the above detection maps with the reference standard maps of normal plantar morphology and motion state, and then reflects the plantar morphology characteristics and motion state of the user, including judgments such as flat feet, high arches, and abnormal gaits.

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