Grid type ultra-thin pressure and shear force synchronous measurement sensor and signal decoupling method

Abstract

The application discloses a grid type ultrathin pressure and shear force synchronous measurement sensor and a signal decoupling method, relates to the technical field of human-computer interaction and intelligent wearable devices, and comprises the following steps: manufacturing a multi-dimensional sensing unit containing a pressure sensing unit and a shear force sensing unit; integrating the pressure sensing unit and the shear force sensing unit in a thin layer structure; and performing pressure and shear force signal decoupling. The application adopts the above-mentioned grid type ultrathin pressure and shear force synchronous measurement sensor and signal decoupling method, realizes high-precision measurement of a contact surface pressure and shear force under space limitation, and significantly improves the practicability of the pressure and shear force in the field of human-computer interaction and intelligent wearable devices.

Description

Technical Field

[0001] This invention relates to the field of human-computer interaction and smart wearable device technology, and in particular to a grid-type ultrathin pressure and shear force synchronous measurement sensor and signal decoupling method. Background Technology

[0002] Contact is a key mode of human daily activity, containing rich information about movement and physiology. Contact force is a complex behavioral characteristic involving factors such as balance and coordination control, the coordinated movement of lower limb joints and muscle groups, and the posture of the upper limbs and trunk. In the field of human-computer interaction, it is also influenced by the dynamics of various limb parts. Furthermore, under the combined action of heterogeneous structures and materials with different stiffnesses, a complex stress state exists at the contact surface, involving the coupling of pressure and shear force. Effectively and simultaneously measuring pressure and shear force under such complex stress conditions, with limited space and uncertain shear force direction, remains a significant challenge in the fields of human-computer interaction and smart wearable devices.

[0003] Due to space constraints and the uncertainty of shear force direction, the coupling effect of pressure and shear force makes accurate measurement extremely difficult. Existing technologies suffer from the following problems: (1) A preliminary consensus has been reached on pressure measurement in thin-layer structures, but the situation of simultaneous measurement of pressure and shear force in space-constrained thin-layer structures has not been addressed.

[0004] (2) There have been preliminary studies on the simultaneous measurement of pressure and shear force, but there are shortcomings in the measurement and applicability of shear force in thin-layer structures.

[0005] (3) The displacement generated in thin-layer structures under shear force is very limited, which makes it difficult to meet the basic requirements of deformation in traditional shear force measurement.

[0006] (4) The combined effect of heterogeneous structures and materials with different stiffnesses leads to a complex stress state in thin-layer structures.

[0007] In summary, due to the variability of human body and human-computer interaction activities, the complexity of heterogeneous structures, and the combined effects of various materials, thin-layer structures are often under complex stress states involving the coupling of pressure and shear forces. Currently, the ability to decouple and measure the complex forces on thin-layer structures is insufficient, resulting in existing force sensors being unable to meet the needs of intelligent wearable devices and human-computer interactions for accurate monitoring of the forces on thin-layer structures. Summary of the Invention

[0008] The purpose of this invention is to provide a grid-type ultrathin pressure and shear force synchronous measurement sensor and signal decoupling method to solve the problems mentioned in the background art. It can perform pressure and shear force synchronous measurement in real time and efficiently, provide users with accurate and reliable results, and provide a solid foundation for decision-making and optimization of human-computer interaction and smart wearable devices.

[0009] To achieve the above objectives, the present invention provides a grid-type ultrathin pressure and shear force synchronous measurement sensor, including a pressure sensing unit disposed below the contact surface and multiple shear force sensing units, wherein the multiple shear force sensing units are arranged around the pressure sensing unit; The shear force sensing unit includes grid electrodes, and a dielectric layer is disposed between the grid electrodes. The pressure sensing unit includes asymmetric electrodes, which are coaxial but have different diameters.

[0010] Preferably, the dielectric layer is made of a flexible insulating material.

[0011] Preferably, a flexible polymer material is disposed between the asymmetric electrodes.

[0012] A method for decoupling the signal of a grid-type ultrathin pressure and shear force synchronous measurement sensor includes the following steps: Step S1: Fabricate a multi-dimensional sensing unit that includes a pressure sensing unit and a shear force sensing unit; Step S2: Integrate the pressure sensing unit and the shear force sensing unit into a thin-layer structure; Step S3: Decouple the pressure and shear force signals.

[0013] Preferably, step S1 includes: Step S11: Design the structure of the pressure sensing unit and shear force sensing unit of the multi-dimensional sensing unit; Step S12: Based on the structural design, proceed with fabrication and assembly.

[0014] Preferably, step S2 includes: arranging pressure sensing units at key positions in the main stress area, arranging shear force sensing units around the key positions in the main stress area, and determining the number, width, and arrangement of grid motors based on the shear force direction measurement requirements of the shear force sensing units. During the deployment process, ensure that the shear force sensing unit and pressure sensing unit are in close contact with the thin-layer structure.

[0015] Preferably, step S3 includes: Step S31: Collect data and process the collected data; Step S32: Perform feature data processing on the processed data to obtain pressure and shear force information.

[0016] Preferably, step S31 includes: Step S311: Perform noise reduction processing on the real-time acquired pressure sensing unit signal and shear force sensing unit signal to obtain smooth signal data; Step S312: Extract signal features from the obtained smooth signal data to identify key multidimensional mechanical features.

[0017] Preferably, the multidimensional mechanical features in step S312 include pressure magnitude, shear force magnitude, and shear force direction.

[0018] Preferably, step S32 includes: calculating key parameters of pressure and shear force based on the extracted multidimensional mechanical features, including pressure amplitude, shear force amplitude and direction.

[0019] Therefore, by employing the aforementioned grid-type ultra-thin pressure and shear force synchronous measurement sensor and signal decoupling method, this invention achieves high-precision measurement of pressure and shear force on space-constrained contact surfaces, significantly improving the practicality of pressure and shear force in the fields of human-computer interaction and smart wearable devices.

[0020] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the grid-type ultra-thin pressure and shear force synchronous measurement sensor of the present invention; Figure 2 This is a schematic diagram illustrating the measurement principle of the grid-type ultra-thin pressure and shear force synchronous measurement sensor of the present invention; Figure 3 This is a flowchart of the method for synchronous measurement of pressure and shear force using a grid-type ultrathin sensor and a signal decoupling method according to the present invention. Detailed Implementation

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] Example Please see Figures 1-3 This invention provides a grid-type ultrathin pressure and shear force synchronous measurement sensor, including a pressure sensing unit disposed below a contact surface and multiple shear force sensing units arranged around the pressure sensing unit. Each shear force sensing unit includes grid electrodes, with a dielectric layer made of a flexible insulating material disposed between the grid electrodes. The pressure sensing unit includes asymmetric electrodes, which are coaxial but have different diameters, and a flexible polymer material is disposed between the asymmetric electrodes.

[0025] A method for decoupling the signal of a grid-type ultrathin pressure and shear force synchronous measurement sensor includes the following steps: Step S1: Fabricate a multi-dimensional sensing unit that includes pressure sensing units and shear force sensing units. This multi-dimensional sensing unit can simultaneously sense pressure and shear force, improving the diversity and accuracy of data acquisition. This includes: Step S11: Design the structure of the pressure sensing unit and shear force sensing unit of the multi-dimensional sensing unit. The structural design diagram is shown below. Figure 1 As shown.

[0026] Step S12: Assemble and fabricate the sensor structure according to the structural design, taking into account the requirements of human-computer interaction and smart wearable devices. For example... Figure 1 As shown, the sensor structure includes a pressure sensing unit and multiple shear force sensing units disposed below the contact surface.

[0027] The shear force sensing unit includes grid electrodes with a flexible insulating material serving as a dielectric layer between them. When shear force is applied, the grid electrodes in the shear force sensing unit misalign, and each grid along the shear force direction is misaligned. This allows for the acquisition of large signal changes even with small deformations under shear force, effectively improving the shear force sensing capability. Furthermore, the number and arrangement of these shear force sensing units can be designed according to the shear force accuracy requirements of human-computer interaction and smart wearable devices, including the number, width, and arrangement of the grids.

[0028] The pressure sensing unit is made of flexible polymer material and asymmetric electrodes. The electrodes are coaxial but have different diameters, ensuring that the contact area between the two electrodes remains constant under shear force. This pressure sensing unit possesses excellent sensitivity and durability, and can provide stable signal data under stress conditions.

[0029] Changes and differences in sensor signals can effectively reflect different pressure and shear force states. The flexible, thin-layer pressure and shear force sensing unit significantly reduces its interference with human-computer interaction and human movement, effectively improving the comfort and convenience of wearing it.

[0030] Step S2: Integrate the pressure sensing unit and the shear force sensing unit into the thin-layer structure. Specifically, this includes: Sensor positioning: When embedding pressure sensing units and shear force sensing units in a thin-layer structure, the placement of these units is scientifically selected based on the distribution characteristics of mechanical requirements in human-computer interaction and smart wearable devices. Placing pressure sensing units in key areas, and then strategically deploying shear force sensing units around these areas, ensures that the sensor structure covers all major stress areas, comprehensively capturing dynamic stress conditions and improving the accuracy of data acquisition.

[0031] Ensuring fit: The sensing unit and shear force sensing unit maintain close contact with the thin-layer structure, ensuring they adhere tightly to the surface under various actions, thus guaranteeing accurate data acquisition. This improves the sensor-surface fit, effectively limiting sensor positional shift during dynamic motion and achieving high-quality data acquisition.

[0032] Step S3: Decouple the pressure and shear force signals. This includes: Step S31: Collect data and process the collected data. This includes: Step S311: Denoising the real-time acquired pressure sensing unit signals and shear force sensing unit signals to obtain smooth signal data. A refined data cleaning and standardization process is employed to ensure the integrity and consistency of all data.

[0033] Step S312: Extract signal features from the obtained smooth signal data to identify key multidimensional mechanical features. These multidimensional mechanical features include pressure magnitude, shear force magnitude, and shear force direction.

[0034] Step S32: Perform feature data processing on the processed data to obtain pressure and shear force information. Based on the extracted multidimensional mechanical features, key parameters of pressure and shear force, including pressure amplitude, shear force amplitude, and direction, are calculated, reflecting the true situation of complex stress. Feature extraction not only improves the speed and accuracy of calculations but also demonstrates good robustness in various complex stress environments.

[0035] Therefore, by employing the aforementioned grid-type ultra-thin pressure and shear force synchronous measurement sensor and signal decoupling method, this invention achieves high-precision measurement of pressure and shear force on space-constrained contact surfaces, significantly improving the practicality of pressure and shear force in the fields of human-computer interaction and smart wearable devices.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A grid-type ultra-thin pressure and shear force synchronous measurement sensor, characterized in that: It includes a pressure sensing unit disposed below the contact surface and multiple shear force sensing units, with the multiple shear force sensing units arranged around the pressure sensing unit; The shear force sensing unit includes grid electrodes, and a dielectric layer is disposed between the grid electrodes. The pressure sensing unit includes asymmetric electrodes, which are coaxial but have different diameters.

2. The grid-type ultra-thin pressure and shear force synchronous measurement sensor according to claim 1, characterized in that: The dielectric layer is made of a flexible insulating material.

3. The grid-type ultra-thin pressure and shear force synchronous measurement sensor according to claim 2, characterized in that: A flexible polymer material is disposed between the asymmetric electrodes.

4. A signal decoupling method for a grid-type ultrathin pressure and shear force synchronous measurement sensor, using the grid-type ultrathin pressure and shear force synchronous measurement sensor as described in any one of claims 1-3, characterized in that, Includes the following steps: Step S1: Fabricate a multi-dimensional sensing unit that includes a pressure sensing unit and a shear force sensing unit; Step S2: Integrate the pressure sensing unit and the shear force sensing unit into a thin-layer structure; Step S3: Decouple the pressure and shear force signals.

5. The signal decoupling method of the grid-type ultrathin pressure and shear force synchronous measurement sensor according to claim 4, characterized in that, Step S1 includes: Step S11: Design the structure of the pressure sensing unit and shear force sensing unit of the multi-dimensional sensing unit; Step S12: Based on the structural design, proceed with fabrication and assembly.

6. The signal decoupling method of the grid-type ultrathin pressure and shear force synchronous measurement sensor according to claim 5, characterized in that, Step S2 includes: placing pressure sensing units at key locations in the main stress area, arranging shear force sensing units around the key locations in the main stress area, and determining the number, width, and arrangement of grid motors based on the shear force direction measurement requirements of the shear force sensing units. During the deployment process, ensure that the shear force sensing unit and pressure sensing unit are in close contact with the thin-layer structure.

7. The signal decoupling method of the grid-type ultrathin pressure and shear force synchronous measurement sensor according to claim 6, characterized in that, Step S3 includes: Step S31: Collect data and process the collected data; Step S32: Perform feature data processing on the processed data to obtain pressure and shear force information.

8. The signal decoupling method of the grid-type ultrathin pressure and shear force synchronous measurement sensor according to claim 7, characterized in that, Step S31 includes: Step S311: Perform noise reduction processing on the real-time acquired pressure sensing unit signal and shear force sensing unit signal to obtain smooth signal data; Step S312: Extract signal features from the obtained smooth signal data to identify key multidimensional mechanical features.

9. The signal decoupling method of the grid-type ultrathin pressure and shear force synchronous measurement sensor according to claim 8, characterized in that: The multidimensional mechanical characteristics in step S312 include pressure magnitude, shear force magnitude, and shear force direction.

10. The signal decoupling method of the grid-type ultrathin pressure and shear force synchronous measurement sensor according to claim 9, characterized in that, Step S32 includes: calculating key parameters of pressure and shear force based on the extracted multidimensional mechanical features, including pressure amplitude, shear force amplitude and direction.

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