CN220104691U - Contact type measurement module for measuring elastic parameters of surface structure - Google Patents
Contact type measurement module for measuring elastic parameters of surface structure Download PDFInfo
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- CN220104691U CN220104691U CN202321387277.5U CN202321387277U CN220104691U CN 220104691 U CN220104691 U CN 220104691U CN 202321387277 U CN202321387277 U CN 202321387277U CN 220104691 U CN220104691 U CN 220104691U
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Abstract
The utility model relates to a contact measurement module for measuring elastic parameters of a surface structure, comprising: against a reference surface of the surface structure directly or indirectly during measurement; a sensor for measuring a mechanical response of the surface structure upon application of an action to the surface structure, the action comprising at least pressing or stretching; an actuator for driving the sensor to perform the action; pressure detecting means for sensing a contact pressure of the reference surface with the surface structure when the reference surface directly or indirectly abuts against the surface structure; and a processing module coupled to the sensor, the actuator, and the pressure detection device, respectively.
Description
Technical Field
The utility model relates to a contact measurement of elastic parameters of a surface structure, in particular to detection of elasticity, in particular longitudinal elasticity, of the skin of an animal or of the epidermis of a plant.
Background
Such as the surface structure of the skin of a human body or the epidermis of a plant fruit, etc., it is important to analyze the physical properties of the surface. Taking human skin as an example, the surface elasticity of skin has measurement value for both the cosmetic field and the dermatological field, and elasticity can be classified into measurement of the longitudinal (normal) elasticity of skin and measurement of the transverse (tangential) elasticity of skin.
For the measurement of the longitudinal elasticity of the skin, the most common CK-belonging device in the market at present, as shown in US5054502a, adopts negative pressure + optical measurement, and the front end face of the outer wall of the probe module is pressed against the skin during each detection, and then the skin is deformed/displaced in a vacuum sucking manner or a piston pressing manner, and the measurement is performed in combination with the weakening of the light intensity transmitted from the light emitter to the light receiver. The front end face presses the skin to generate pressure when the scheme is measured, and the skin has a certain elastic modulus, and the elasticity of the human skin is about 0.70+/-0.46N in the research of Stiffness and Elasticity of the Masticatory and FacialExpression Muscles in Patients with the Masticatory MusclePain Korean J Oral Med Vol.34 and No.3,2009. Since the front face presses against human skin during detection, and the skin has an elastic modulus and is associated with each other, squeezing of the front face against the skin it covers (herein the squeezing force is referred to as external pressure, and refers to the pressure between the front face and the skin) will cause the elasticity of the skin in the aperture of the front face to change to a degree that is related to the degree of squeezing. If the external pressure used in each measurement is different, the measurement will be disturbed because the pressure environment of each measurement changes and the reference of each measurement is different.
Disclosure of Invention
The utility model provides a contact type measuring module for measuring elastic parameters of a surface structure, which aims to overcome the defects of the prior art.
The contact measurement module of the present utility model comprises: against a reference surface of the surface structure directly or indirectly during measurement; a sensor for measuring a mechanical response of the surface structure upon application of an action to the surface structure, the action comprising at least pressing or stretching; an actuator for driving the sensor to perform the action; pressure detecting means for sensing a contact pressure of the reference surface with the surface structure when the reference surface directly or indirectly abuts against the surface structure; and a processing module coupled to the sensor, the actuator, and the pressure detection device, respectively.
The measuring module (also called measuring probe) of the utility model feeds back the contact pressure (external pressure) between the reference surface and the surface structure such as human skin by using the pressure detecting device in the detection process, and the external system such as a manipulator moves the module until the contact pressure is adjusted to be consistent with the previous measurement, so that the sensor is maintained to have a uniform external pressure measuring environment in each measurement, the measurement error is avoided being introduced, the sensor can apply pressing or stretching action under the stable measurement reference, the mechanical response of the surface structure is further measured, and the measurement result is more accurate.
In the present utility model, the reference plane is used to keep the force of the contact surface structure substantially the same for each measurement, wherein reference plane is to be understood as the outer surface of the module housing with the sensor.
As a refinement, the number of pressure detection devices is configured to be at least two and arranged around the sensor to ensure detection uniformity while taking into account the respective positions in the circumferential direction. Preferably, the number of the pressure detection devices is at least three and is uniformly distributed around the sensor.
In the present utility model, for the solution of pressing the surface structure with the sensor, the sensor may be configured to comprise a pressure detecting sensor coupled to an actuator for driving the pressure detecting sensor in a normal direction in contact with the surface structure during measurement. Further, the pressure detection sensor is configured as a first sensor unit, the first sensor unit is provided with a flexible multifunctional layer, a curved elastic electrode electrically connected with the multifunctional layer is arranged in the flexible multifunctional layer to serve as an upper electrode, a lower electrode is arranged below the upper electrode, an insulating layer is arranged between the upper electrode and the lower electrode, the downward projection of the upper electrode at least covers part of the area of the lower electrode, and the flexible multifunctional layer is deformed by external force to drive the upper electrode to change the contact area with the insulating layer; the non-contact measurement module is provided with a capacitance-to-digital conversion circuit (CDC) of the coupling processing module, which is coupled to each electrode through a switch array for capacitance formed between the upper electrode and the lower electrode in the first sensor unit. When the flexible multifunctional layer is pressed, deformation of the flexible multifunctional layer and the formed capacitance between the upper electrode and the lower electrode reflect components of force in the normal direction, capacitance value acquisition is carried out on each electrode by matching with CDC, higher force resolution can be achieved, and due to the fact that the touch sense mode is adopted for direct measurement, accurate measurement can be achieved on elastic force.
For the stretching scheme using the sensor, the sensor may be configured to include a tension detecting sensor, the surface of which is provided with an adhesive layer, such as double-sided tape, for contacting the surface structure; the tension sensor is coupled to an actuator for driving the tension sensor along a normal direction in contact with the surface structure during measurement. When the tension detection sensor is in contact with a surface structure such as human skin, the surface double faced adhesive tape is adhered to the human skin to provide pre-adhesion force, the actuator drives the tension detection sensor to move, the tension detection sensor is in a tension state to generate tension force, and the tension force and the pre-adhesion force can obtain the actual contact stress of the human skin and the sensor. In the utility model, after detection is finished, the protective cover can be arranged to prevent the double faced adhesive tape from being in long-term contact with air to generate oxidation reaction to change viscosity; or, the double faced adhesive tape can be made into consumable, and when the double faced adhesive tape needs to be detected, the double faced adhesive tape is placed in a groove of a watchcase, the double faced adhesive tape is completely taken down after monitoring, and the bonding position is wiped, so that the pre-adhesion of each test is kept relatively stable.
In the present utility model, the surface structure is configured to include the skin of an animal or the epidermis of a plant.
Drawings
FIG. 1 shows a schematic diagram of a measurement module structure of a contact measurement module of a surface structure elasticity parameter;
fig. 2 shows a schematic diagram of the pressing scheme of a contact measurement module of the surface structure elasticity parameter;
FIG. 3 shows a schematic diagram of the distribution relationship of a flexible upper electrode and a lower electrode;
FIG. 4-1 is a schematic diagram showing the distribution relationship of a common flexible upper electrode and a grouped lower electrode;
FIG. 4-2 is a schematic diagram showing the distribution relationship of the grouped flexible upper electrodes and the common lower electrode;
FIG. 5 shows a schematic drawing of a stretching scheme of a contact measurement module of the surface structure elasticity parameter;
FIG. 6 is a schematic view showing the mounting structure of the protective cover after the inspection is completed;
fig. 7 shows a schematic diagram of the relative positions of the detection module and the surface structure.
Detailed Description
As shown in fig. 1, the contact measurement module for the elastic parameter of the surface structure mainly comprises a sensor 100, an actuator 200, a reference surface fixing structure 300, a processing module 400 and a pressure detection device 700. In the measuring process, the reference surface fixing structure 300, namely the boss surface, is guaranteed to be in contact with the surface structure, the reference surface fixing structure 300 is fixed with the main body structure through the limiting screw, a tiny gap exists in the middle of the boss surface fixing structure, the reference surface fixing structure 300 is guaranteed to be in contact with the pressure detecting device 700, the pressure detecting device 700 is a pressure sensing device fixed to the main body structure, when the reference surface fixing structure 300 is in contact with the surface structure, pressure is generated and is conducted to the pressure detecting device 700, the actual contact pressure of the reference surface fixing structure 300 and the surface structure is obtained, the detecting module can be controlled by an external mechanical arm, the position of the detecting module is adjusted according to stress information fed back by the pressure detecting device, the position and stress of each measurement are guaranteed to be relatively fixed, and no displacement is generated between the reference surface fixing structure 300 and the surface structure in the testing process. Under stable test conditions, the actuator 200 drives the sensor 100 to stretch or press the surface structure, and the information fed back by the sensor 100 is analyzed by the processing module 400 to obtain the elastic parameter of the surface structure.
As shown in fig. 2, the sensor 100 mainly includes a flexible upper electrode 101 (formed by integrally forming a flexible multifunctional layer at the bottom and an upper electrode protruding upward to form a curved hemisphere at the middle part in the multifunctional layer), an insulating layer 102, and a lower electrode 103 disposed on a processing module 400, where the lower electrode and the processing module 400 are detachably disposed. The sensor 100 is driven by the actuator 200 to move along the normal direction of the skin structure, thereby realizing the pressing action on the skin structure. The reference surface fixing structure 300 limits the initial states of the detection module and the skin structure, the sensor 100 presses under the action of the actuator 200, and the deformation amount of the flexible upper electrode 101 is different in the same displacement state due to the different elastic parameters of the skin structure, so that the difference of the elastic parameters of the skin structure is determined by the processing module 400 for the capacitance value change of the sensor 100. The sensor 100 may be provided in plural, to obtain plural sets of average value reduction measurement errors.
As shown in fig. 3, the flexible upper electrode 101 is contacted with the insulating layer 102 on the surface of the lower electrode 103 under the action of external force, and the flexible upper electrode 101 is deformed due to the pressing, so that the mutual capacitance formed by the flexible upper electrode 101 and the lower electrode 103 is changed, and the normal force applied to the sensor 100 can be obtained through the capacitance value change.
As shown in fig. 4-1, the lower electrode 103 may be configured as a plurality of distributed electrodes, may be configured as a strip or as at least 3 detection electrodes in different directions according to deformation, the flexible upper electrode 101 and the lower electrode 103 are partitioned differently, and different mutual capacitances may be formed by matching the switch arrays of the processing modules, when the flexible upper electrode 101 is deformed under stress, the direction and the amplitude of the change of the hemisphere are different according to the magnitude of the stress, and the contact area of the hemisphere and the different partitions of the lower electrode 103 are different, so that the measured capacitance changes differently, and the direction and the magnitude of the force can be obtained.
As shown in fig. 4-2, the flexible upper electrode 101 may be divided into a plurality of parts, the parts are bonded together by an insulating layer, the parts are not conducted, the lower electrode 103 is an integral body as a common electrode, and the magnitude and direction information of the output force can be obtained according to the capacitance change values of different electrode compositions.
As shown in fig. 5, when the detection module detects the surface characteristic parameters in the tensile state, the sensor 100 mainly comprises a tension sensor 105 and an adhesive layer 104, the tension sensor 105 is coupled to the actuator 200, the actuator 200 drives the tension sensor 105 to move relative to the skin structure in a normal direction during measurement, the tension sensor 105 contacts with the surface structure such as human skin, the adhesive layer 104 such as double-sided adhesive is adhered to the human skin to provide pre-adhesive force, the actuator 200 drives the tension sensor 105 to move normally, the tension sensor 105 is in the tensile state to generate tensile force, the tensile force and the pre-adhesive force can obtain the actual contact stress between the human skin and the sensor 100, and the surface physical characteristic parameters of the skin structure can be determined by comparing the actual contact stress with the movement distance of the actuator 200.
As shown in fig. 6, after the detection is completed, a protective cover 500 may be installed to prevent the double faced adhesive tape from being in long-term contact with air to generate oxidation reaction to change viscosity; or, the adhesive layer 104 can be made into consumable, when the detection is needed, the adhesive layer 104 is placed in the groove of the watch case, the detection is completed, the adhesive layer 104 is removed, the bonding position is wiped, and the pre-adhesion of each test is ensured to be kept relatively stable.
As shown in fig. 7, the detection of the surface structure 600 by the surface structure physical property detection module may include normal pressing or normal stretching, and the surface structure 600 may be configured as human or animal skin or plant epidermis.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the scope of the present utility model, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model.
Claims (7)
1. A contact measurement module for measuring a surface texture elastic parameter, comprising:
against a reference surface of the surface structure directly or indirectly during measurement;
a sensor for measuring a mechanical response of the surface structure upon application of an action to the surface structure, the action comprising at least pressing or stretching;
an actuator for driving the sensor to perform the action;
pressure detecting means for sensing a contact pressure of the reference surface with the surface structure when the reference surface directly or indirectly abuts against the surface structure;
and a processing module coupled to the sensor, the actuator, and the pressure detection device, respectively.
2. The contact measurement module of claim 1, wherein:
the number of pressure detection devices is configured to be at least two and arranged around the sensor.
3. The contact measurement module of claim 1, wherein:
the sensor is configured to include a pressure detection sensor;
the pressure detection sensor is coupled to the actuator for driving the pressure detection sensor along a normal direction in contact with the surface structure during measurement.
4. A contact measurement module according to claim 3, characterized in that:
the pressure detection sensor is configured into a first sensor unit, the first sensor unit is provided with a flexible multifunctional layer, a curved elastic electrode electrically connected with the multifunctional layer is arranged in the flexible multifunctional layer to serve as an upper electrode, a lower electrode is arranged below the upper electrode, an insulating layer is arranged between the upper electrode and the lower electrode, the downward projection of the upper electrode at least covers part of the area of the lower electrode, and the flexible multifunctional layer is deformed by external force to drive the upper electrode to change the contact area with the insulating layer;
the contact type measurement module is provided with a capacitance-to-digital conversion circuit of the coupling processing module, and the capacitance-to-digital conversion circuit is coupled with each electrode through a switch array and is used for forming capacitance between an upper electrode and a lower electrode in the first sensor unit.
5. The contact measurement module of claim 1, wherein:
the sensor is configured to comprise a tension detection sensor, and the surface of the tension detection sensor, which is used for contacting the surface structure, is provided with an adhesive layer;
a tension sensor is coupled to the actuator for driving the tension sensor along a normal direction in contact with the surface structure during measurement.
6. The contact measurement module of claim 5, wherein: the adhesive layer is configured as a double sided tape.
7. The contact measurement module of claim 1, wherein: the surface structure is configured to include the skin of an animal or the epidermis of a plant.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321387277.5U CN220104691U (en) | 2023-06-02 | 2023-06-02 | Contact type measurement module for measuring elastic parameters of surface structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321387277.5U CN220104691U (en) | 2023-06-02 | 2023-06-02 | Contact type measurement module for measuring elastic parameters of surface structure |
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| CN220104691U true CN220104691U (en) | 2023-11-28 |
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| CN202321387277.5U Active CN220104691U (en) | 2023-06-02 | 2023-06-02 | Contact type measurement module for measuring elastic parameters of surface structure |
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- 2023-06-02 CN CN202321387277.5U patent/CN220104691U/en active Active
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