Preparation method of wearable flexible sensor

Abstract

The invention relates to the technical field of wearable sensors, in particular to a preparation method of a wearable flexible sensor, which comprises the following steps: designing a structure with negative Poisson's ratio characteristics as a two-dimensional enhanced star-shaped unit cell, printing the two-dimensional enhanced star-shaped unit cell on the surface of a flexible substrate to prepare an elastic substrate, and spraying a conductive sensitive layer on the plane side of the elastic substrate to prepare the wearable flexible sensor. The flexible sensor is prepared through drying and wiring packaging, whether the prepared flexible sensor is qualified or not is judged based on the test sensitivity, and a qualification instruction is sent out when it is judged that the prepared flexible sensor is qualified; and when the manufactured flexible sensor is judged to be unqualified, determining an unqualified reason and determining a corresponding processing mode to generate a corresponding instruction, and transmitting the instruction to a corresponding part to enable the part to prepare the flexible sensor again according to the re-determined preparation parameters. According to the invention, intelligent identification and accurate regulation and control of the parameters of the flexible sensor are effectively completed, the preparation efficiency of the flexible sensor is effectively ensured, and the application field of the flexible sensor is widened.

Description

Technical Field

[0001] The present invention relates to the technical field of wearable sensors, and in particular to a method for preparing a wearable flexible sensor. Background Art

[0002] Wearable flexible sensors are electronic devices with human skin-like functions developed with the help of flexible electronic technology. They can convert external stimulus signals into recordable electrical signals through signal conduction, helping humans to obtain and analyze a variety of information in the environment and the human body. This type of sensor has the advantages of softness, strong perception, low cost, simple preparation process, small size, easy wearing and high stability. It is widely used in human-computer interaction systems, robots, medical equipment and other fields. Wearable flexible sensors must show excellent performance in three key parameters: sensitivity, stretchability and cycle durability. In particular, sensitivity is extremely important because it allows precise detection of tiny movements. How to adjust and reduce the conventional lateral Poisson compression under stretching remains a key issue for improving sensitivity.

[0003] Chinese Patent Publication No.: CN113834418B, discloses a flexible strain sensor with adjustable Poisson's ratio. The invented strain sensor realizes the regulation of Poisson's ratio under different parameter conditions by designing a special mechanical superstructure. It can be seen that the above scheme realizes the regulation of Poisson's ratio by adjusting the line width of straight lines and arcs, so that the sensor presents the effects of positive Poisson's ratio, near-zero Poisson's ratio and negative Poisson's ratio. However, in the preparation process of flexible sensors, it is impossible to adjust the parameters of flexible sensors in a targeted manner based on intelligent identification and precise control, and it is impossible to realize the preparation of flexible sensors with precise control of negative Poisson's ratio, which limits the use field of flexible sensors and cannot guarantee the preparation efficiency of flexible sensors. Summary of the invention

[0004] To this end, the present invention provides a method for preparing a wearable flexible sensor, so as to overcome the problem in the prior art that the flexible sensor parameters cannot be specifically adjusted based on intelligent identification and precise regulation, and the application field cannot be broadened while ensuring the preparation efficiency of the flexible sensor.

[0005] To achieve the above object, the present invention provides a method for preparing a wearable flexible sensor, comprising:

[0006] A new elastic polymer is selected as the flexible substrate surface;

[0007] The traditional two-dimensional star-shaped unit cell for designing a structure with negative Poisson's ratio characteristics is a two-dimensional enhanced star-shaped unit cell;

[0008] Printing the two-dimensional enhanced star-shaped unit cell of corresponding size onto the surface of the flexible substrate to prepare an elastic substrate;

[0009] Spraying a conductive sensitive layer on the plane side of the elastic substrate, drying it, wiring and packaging it to prepare a flexible sensor;

[0010] Performing a sensitivity test on the prepared flexible sensor to obtain a test sensitivity;

[0011] Determining whether the manufactured flexible sensor is qualified based on the test sensitivity, and determining the reason for the failure based on the test sensitivity when the manufactured flexible sensor is determined to be unqualified;

[0012] After the cause is determined, a corresponding treatment method is generated based on the determined cause;

[0013] Generate a corresponding instruction based on the determined processing method, and transmit the instruction to the corresponding component so that the component re-fabricates the flexible sensor with the re-determined preparation parameters;

[0014] When the manufactured flexible sensor is determined to be qualified, a qualified instruction is issued, and the manufacturing of the flexible sensor is completed.

[0015] Further, the process of determining whether the manufactured flexible sensor is qualified based on the sensitivity includes:

[0016] Comparing the obtained test sensitivity with the pre-stored preset sensitivity;

[0017] When the test sensitivity is greater than or equal to a second preset sensitivity, the flexible sensor is judged to be qualified and a qualified instruction is issued;

[0018] When the test sensitivity is less than the second preset sensitivity and greater than or equal to the first preset sensitivity, the flexible sensor is determined to be unqualified, and whether the flexible sensor is qualified is re-determined based on the length of the elastic substrate of the manufactured flexible sensor;

[0019] When the test sensitivity is less than the first preset sensitivity, the flexible sensor is determined to be unqualified, and the reason why the manufactured flexible sensor is unqualified is determined based on the sensitivity difference, wherein the sensitivity difference is the difference between the first preset sensitivity and the test sensitivity.

[0020] Further, the process of re-determining whether the flexible sensor is qualified based on the length of the elastic substrate of the manufactured flexible sensor includes:

[0021] Measuring the length of the elastic substrate, and recording the measured length as the test substrate length;

[0022] Comparing the test substrate length with a pre-stored preset substrate length;

[0023] When the test substrate length is less than or equal to the preset substrate length, the test tension of the flexible sensor is changed, and the test tension is reduced based on the substrate length difference, and the reduction amplitude of the test tension is proportional to the substrate length difference, and whether the flexible sensor is qualified is re-determined after reducing the test tension, wherein the substrate length difference is the difference between the preset substrate length and the test substrate length;

[0024] When the test substrate length is greater than the preset substrate length, the manufactured flexible sensor is determined to be unqualified, and the reason why the manufactured flexible sensor is unqualified is determined based on the sensitivity difference.

[0025] Further, the process of determining the reason why the manufactured flexible sensor is unqualified based on the sensitivity difference includes:

[0026] Comparing the obtained sensitivity difference with a pre-stored preset sensitivity difference, and determining the cause based on the comparison result;

[0027] When the sensitivity difference is less than or equal to a first preset sensitivity difference, it is determined that the reason why the manufactured flexible sensor is unqualified is that the size of the two-dimensional enhanced star-shaped unit cell in the flexible sensor does not meet the standard, and the size of the two-dimensional enhanced star-shaped unit cell is determined based on the longitudinal shortening amount of the flexible sensor;

[0028] When the sensitivity difference is greater than the first preset sensitivity difference and less than or equal to the second preset sensitivity difference, it is determined that the reason why the manufactured flexible sensor is unqualified is that the number of data collected during the sensitivity test of the flexible sensor does not meet the standard, and the number of data collected during the sensitivity test of the flexible sensor is corrected based on the sensitivity deviation, wherein the sensitivity deviation is the difference between the sensitivity difference and the first preset sensitivity difference;

[0029] When the sensitivity difference is greater than the second preset sensitivity difference, it is determined that the reason why the flexible sensor is unqualified is that the drying time of the planar side of the elastic substrate in the flexible sensor after spraying the conductive sensitive layer does not meet the standard, and the drying time for the elastic substrate sprayed with the conductive sensitive layer is adjusted to a corresponding value based on the surface area of ​​the elastic substrate.

[0030] Furthermore, the process of adjusting the size of the two-dimensional enhanced star-shaped unit cell includes:

[0031] Obtaining the longitudinal shortening amount of the flexible sensor during the test;

[0032] Calculating the difference between the pre-stored preset longitudinal shortening amount and the longitudinal shortening amount, and recording the obtained difference as the longitudinal shortening amount difference;

[0033] Increasing the cell size based on the longitudinal shortening difference, wherein the increase in the cell size is proportional to the longitudinal shortening difference;

[0034] After the cell size is increased, the crossbar length of the two-dimensional enhanced star-shaped unit cell is re-determined based on the proportional relationship.

[0035] Further, the process of re-determining the crossbar length of the two-dimensional enhanced star-shaped unit cell based on the proportional relationship after the cell size increases includes:

[0036] Determining the proportional relationship between the cell size and the crossbar length;

[0037] Re-determining the length of the crossbar based on the proportional relationship, and re-preparing the flexible sensor and re-testing the sensitivity after adjusting the length of the crossbar;

[0038] Whether the remanufactured flexible sensor is qualified is determined based on the retested sensitivity, and when the remanufactured flexible sensor is determined to be unqualified, the outer cell wall thickness of the two-dimensional enhanced star-shaped unit cell is adjusted based on the retested sensitivity.

[0039] Further, the process of adjusting the outer cell wall thickness based on the retested sensitivity includes:

[0040] Calculating the difference between the preset sensitivity and the retested sensitivity, and recording the obtained difference as the retested sensitivity difference;

[0041] The outer cell wall thickness is reduced based on the remeasurement sensitivity difference, and the reduction range of the outer cell wall thickness is proportional to the remeasurement sensitivity difference. After the outer cell wall thickness is reduced, the inner cell wall thickness of the two-dimensional enhanced star-shaped unit cell is re-determined based on the proportional relationship.

[0042] Furthermore, the process of re-determining the thickness of the inner cell wall of the two-dimensional enhanced star-shaped unit cell based on the proportional relationship includes:

[0043] Determining a proportional relationship between the thickness of the outer cell wall and the thickness of the inner cell wall;

[0044] The inner cell wall thickness is re-determined based on the proportional relationship.

[0045] Further, the process of correcting the amount of data collected during the sensitivity test of the flexible sensor based on the sensitivity deviation includes:

[0046] comparing the sensitivity deviation with a pre-stored preset sensitivity deviation;

[0047] The amount of data collected during the sensitivity test is increased based on the sensitivity deviation, and the increase in the amount of data collected is proportional to the sensitivity deviation.

[0048] Furthermore, the process of adjusting the drying time of the elastic substrate sprayed with the conductive sensitive layer to a corresponding value based on the surface area of ​​the elastic substrate includes:

[0049] calculating the surface area of ​​the elastic substrate;

[0050] Calculating the difference between the surface area of ​​the elastic substrate and the pre-stored preset surface area, and recording the obtained difference as the surface area difference;

[0051] The drying time is increased based on the surface area difference, and the increase in the drying time is proportional to the surface area difference.

[0052] Compared with the prior art, the beneficial effect of the present invention lies in that the present invention can make the prepared flexible sensor have negative Poisson's ratio characteristics by selecting a structure with negative Poisson's ratio characteristics, designing the traditional two-dimensional star-shaped unit cell as a two-dimensional enhanced star-shaped unit cell and printing it on the surface of a flexible substrate to prepare an elastic substrate, so that the prepared flexible sensor has excellent negative Poisson's ratio characteristics and adjustable parameters, judging whether the prepared flexible sensor is qualified based on the test sensitivity, and determining the reason for the failure when the prepared flexible sensor is judged to be unqualified, and after the cause is determined, generating a corresponding processing method based on the determined cause, effectively completing the intelligent identification of the flexible sensor parameters, generating a corresponding instruction based on the determined processing method, transmitting the instruction to the corresponding component so that the component receiving the instruction re-determines its operating parameters, effectively completing the precise regulation of the flexible sensor parameters, and effectively broadening the application field of the flexible sensor while effectively ensuring the preparation efficiency of the flexible sensor.

[0053] Furthermore, when the manufactured flexible sensor is determined to be unqualified, re-determining whether the flexible sensor is qualified is based on the length of the elastic substrate of the manufactured flexible sensor. This can more accurately determine whether the flexible sensor is qualified and avoid misjudgment. While further completing the intelligent identification of the flexible sensor parameters, the preparation efficiency of the flexible sensor is further guaranteed.

[0054] Furthermore, when it is determined that the manufactured flexible sensor is unqualified, the reason for the unqualified flexible sensor is determined based on the sensitivity difference, and the reason for the unqualified flexible sensor can be specifically determined, which is conducive to the subsequent precise regulation of the flexible sensor parameters. While further completing the intelligent identification of the flexible sensor parameters, the preparation efficiency of the flexible sensor is further guaranteed.

[0055] Furthermore, when it is determined that the size of the two-dimensional enhanced star-shaped unit cell does not meet the standard, the cell size of the two-dimensional enhanced star-shaped unit cell is increased. The increase in the cell size of the two-dimensional enhanced star-shaped unit cell increases the negative Poisson's ratio of the two-dimensional enhanced star-shaped unit cell, further completing the precise control of the flexible sensor parameters. The sensitivity of the prepared flexible sensor is increased, while further ensuring the preparation efficiency of the flexible sensor, further broadening the application field of the flexible sensor.

[0056] Furthermore, after the cell size of the two-dimensional enhanced star-shaped unit cell increases, the crossbar length of the two-dimensional enhanced star-shaped unit cell is re-determined based on the proportional relationship, which ensures the proportional relationship between the cell size and the crossbar length, effectively ensures the structural stability of the two-dimensional enhanced star-shaped unit cell, and further completes the precise control of the flexible sensor parameters while further ensuring the preparation efficiency of the flexible sensor.

[0057] Furthermore, when the flexible sensor is determined to be unqualified after adjusting the size of the two-dimensional enhanced star-shaped unit cell, the outer cell wall thickness of the two-dimensional enhanced star-shaped unit cell is reduced based on the sensitivity of the retest. After the outer cell wall thickness is reduced, the negative Poisson's ratio of the two-dimensional enhanced star-shaped unit cell increases, thereby further completing the precise control of the flexible sensor parameters, so that the sensitivity of the prepared flexible sensor is further increased, while further ensuring the preparation efficiency of the flexible sensor, further broadening the application field of the flexible sensor.

[0058] Furthermore, after the outer cell wall thickness of the two-dimensional enhanced star-shaped unit cell is reduced, the inner cell wall thickness of the two-dimensional enhanced star-shaped unit cell is redetermined based on the proportional relationship, so that the ratio of the inner cell wall thickness to the outer cell wall thickness is coordinated, which effectively ensures the structural stability of the two-dimensional enhanced star-shaped unit cell, while further completing the precise control of the flexible sensor parameters and further ensuring the preparation efficiency of the flexible sensor.

[0059] Furthermore, when it is determined that the prepared flexible sensor is unqualified and there is a problem with the number of data collected during the sensitivity test, the number of data collected during the sensitivity test of the flexible sensor is increased based on the sensitivity deviation, thereby effectively ensuring the reliability of the sensitivity test results of the prepared flexible sensor, while further completing the precise control of the flexible sensor parameters and further ensuring the preparation efficiency of the flexible sensor.

[0060] Furthermore, when the prepared flexible sensor is judged to be unqualified and the drying time does not meet the standard, the drying time is increased based on the surface area of ​​the elastic substrate, thereby effectively ensuring the drying effect of different elastic substrate surface areas, while further completing the precise control of the flexible sensor parameters and further ensuring the preparation efficiency of the flexible sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 A structural block diagram of a system for using a preparation method of a wearable flexible sensor;

[0062] Figure 2 is a flow chart of a method for preparing a wearable flexible sensor of the present invention;

[0063] Figure 3 A flow chart of determining whether a flexible sensor is qualified and re-determining whether the flexible sensor is qualified according to the present invention;

[0064] Figure 4 The flowchart of analyzing the reasons why the flexible sensor fails to meet the standards of the present invention. DETAILED DESCRIPTION

[0065] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0066] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0067] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0068] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] See also Figure 1As shown, it is a structural block diagram of a system using a method for preparing a wearable flexible sensor. The structure of the embodiment of the present invention includes a design unit, a printing unit, a processing unit, a collection unit, an analysis unit and an execution unit; wherein the design unit is used to design the traditional two-dimensional star-shaped unit cell of the structure with negative Poisson's ratio characteristics into a two-dimensional enhanced star-shaped unit cell; the printing unit is connected to the design unit, and is used to print the two-dimensional enhanced star-shaped unit cell on the surface of the flexible substrate to prepare an elastic substrate; the processing unit is connected to the printing unit, and is used to spray a conductive sensitive layer on the plane side of the elastic substrate, dry it, and wire and package it to prepare a flexible sensor; the collection unit is connected to the processing unit, and performs a sensitivity test on the prepared flexible sensor to obtain a test sensitivity; the analysis unit is connected to the collection unit, and is used to determine whether the prepared flexible sensor is qualified based on the test sensitivity, and determine the reason for the unqualified when the prepared flexible sensor is determined to be unqualified, and generate a corresponding processing method based on the determined reason after completing the determination of the reason; the execution unit is connected to the analysis unit, and is used to generate a corresponding instruction based on the determined processing method, and transmit the instruction to the corresponding component so that the component receiving the instruction re-determines the preparation parameters.

[0070] See also Figure 2 As shown, it is a flow chart of the method for preparing the wearable flexible sensor of the present invention. The method of the embodiment of the present invention comprises:

[0071] A new elastic polymer is selected as the flexible substrate surface;

[0072] The traditional two-dimensional star-shaped unit cell for designing a structure with negative Poisson's ratio characteristics is a two-dimensional enhanced star-shaped unit cell;

[0073] Printing the two-dimensional enhanced star-shaped unit cell of corresponding size onto the surface of the flexible substrate to prepare an elastic substrate;

[0074] Spraying a conductive sensitive layer on the plane side of the elastic substrate, drying it, wiring and packaging it to prepare a flexible sensor;

[0075] Performing a sensitivity test on the prepared flexible sensor to obtain a test sensitivity;

[0076] Determining whether the manufactured flexible sensor is qualified based on the test sensitivity, and determining the reason for the failure based on the test sensitivity when the manufactured flexible sensor is determined to be unqualified;

[0077] After the cause is determined, a corresponding treatment method is generated based on the determined cause;

[0078] Generate a corresponding instruction based on the determined processing method, and transmit the instruction to the corresponding component so that the component re-fabricates the flexible sensor with the re-determined preparation parameters;

[0079] When the manufactured flexible sensor is determined to be qualified, a qualified instruction is issued, and the manufacturing of the flexible sensor is completed.

[0080] It can be understood that the new elastic polymer described in the present invention can be silicone rubber or other types of structures with large stretchability, as long as it can be ensured that the new elastic polymer can serve as the surface of the flexible substrate; the structure with negative Poisson's ratio characteristics can be dimethylsiloxane or other types of structures with negative Poisson's ratio characteristics, as long as it can be ensured that the structure with negative Poisson's ratio characteristics can be printed on the surface of the flexible substrate; the conductive sensitive layer can be a carbon nanotube aqueous solution or other types of conductive nanofillers, as long as it can be ensured that the flexible sensor has signal output.

[0081] See also Figure 3 As shown, it is a flow chart of determining whether the flexible sensor is qualified and re-determining the present invention. The process of determining whether the flexible sensor is qualified based on the sensitivity of the embodiment of the present invention includes:

[0082] Comparing the obtained test sensitivity with the pre-stored preset sensitivity;

[0083] When the test sensitivity is greater than or equal to the second preset sensitivity GF2, the flexible sensor is determined to be qualified and a qualified instruction is issued, wherein the second preset sensitivity GF2 in this embodiment is 1680;

[0084] When the test sensitivity is less than the second preset sensitivity GF2 and greater than or equal to the first preset sensitivity GF1, it is determined that the flexible sensor does not meet the standard, and whether the flexible sensor is qualified is re-determined based on the length of the elastic substrate of the manufactured flexible sensor, wherein the first preset sensitivity GF1 in this embodiment is 1590;

[0085] When the test sensitivity is less than the first preset sensitivity GF1, the flexible sensor is judged to be unqualified, and the reason why the manufactured flexible sensor is unqualified is determined based on the sensitivity difference, wherein the sensitivity difference is the difference between the first preset sensitivity and the test sensitivity;

[0086] Specifically, the test sensitivity and the preset sensitivity test strain are 15%, and the sensitivity is the gauge factor under 15% strain.

[0087] Please continue reading Figure 3As shown, the process of re-determining whether the flexible sensor is qualified based on the length of the elastic substrate of the manufactured flexible sensor according to the embodiment of the present invention includes:

[0088] Measuring the length of the elastic substrate, and recording the measured length as the test substrate length;

[0089] Comparing the test substrate length with a pre-stored preset substrate length;

[0090] When the test substrate length is less than or equal to the preset substrate length LB, the test tension of the flexible sensor is changed, and the test tension is reduced based on the substrate length difference, wherein the preset substrate length LB in this embodiment is 30 mm;

[0091] When the test substrate length is greater than the preset substrate length LB, the manufactured flexible sensor is determined to be unqualified, and the reason why the manufactured flexible sensor is unqualified is determined based on the sensitivity difference.

[0092] Specifically, the process of reducing the test tension based on the substrate length difference includes:

[0093] Calculating the difference between the preset substrate length and the test substrate length, and recording the obtained difference as the substrate length difference;

[0094] When the substrate length difference is greater than the second preset substrate length difference ΔD2, the test tension is reduced to 0.82 times of the initial tension, wherein the second preset substrate length difference ΔD2 in this embodiment is 2.8 mm;

[0095] When the substrate length difference is less than or equal to the second preset substrate length difference △D2 and greater than the first preset substrate length difference △D1, the test tension is reduced to 0.88 times of the initial tension, wherein the first preset substrate length difference △D1 in this embodiment is 1.6 mm;

[0096] When the substrate length difference is less than or equal to the first preset substrate length difference ΔD1, reducing the test tension to 0.92 times of the initial tension;

[0097] Whether the flexible sensor is qualified is re-determined after reducing the test tension.

[0098] See also Figure 4 As shown, it is a flow chart of analyzing the reasons why the flexible sensor is unqualified according to the present invention. The process of determining the reasons why the flexible sensor is unqualified based on the sensitivity difference according to the embodiment of the present invention includes:

[0099] Comparing the obtained sensitivity difference with a pre-stored preset sensitivity difference, and determining the cause based on the comparison result;

[0100] When the sensitivity difference is less than or equal to the first preset sensitivity difference △GFD1, it is determined that the reason why the manufactured flexible sensor is unqualified is that the size of the two-dimensional enhanced star-shaped unit cell in the flexible sensor does not meet the standard, and the size of the two-dimensional enhanced star-shaped unit cell is determined based on the longitudinal shortening of the flexible sensor, wherein the first preset sensitivity difference △GFD1 in this embodiment is 50;

[0101] When the sensitivity difference is greater than the first preset sensitivity difference △GFD1 and less than or equal to the second preset sensitivity difference △GFD2, it is determined that the reason why the manufactured flexible sensor is unqualified is that the number of data collected during the sensitivity test of the flexible sensor does not meet the standard, and the number of data collected during the sensitivity test of the flexible sensor is corrected based on the sensitivity deviation, wherein the sensitivity deviation is the difference between the sensitivity difference and the first preset sensitivity difference, and the second preset sensitivity difference △GFD2 in this embodiment is 200;

[0102] When the sensitivity difference is greater than the second preset sensitivity difference △GFD2, it is determined that the reason why the flexible sensor is unqualified is that the drying time of the planar side of the elastic substrate in the flexible sensor after spraying the conductive sensitive layer does not meet the standard, and based on the surface area of ​​the elastic substrate, the drying time for the elastic substrate sprayed with the conductive sensitive layer is adjusted to a corresponding value.

[0103] Please continue reading Figure 4 As shown, the process of adjusting the size of the two-dimensional enhanced star-shaped unit cell in the embodiment of the present invention includes:

[0104] Obtaining the longitudinal shortening amount of the flexible sensor during the test;

[0105] Calculating the difference between the pre-stored preset longitudinal shortening amount and the longitudinal shortening amount, and recording the obtained difference as the longitudinal shortening amount difference;

[0106] When the longitudinal shortening difference is greater than the second preset longitudinal shortening difference △V2, the cell size is increased to 1.65 times the initial cell size, wherein the second preset longitudinal shortening difference △V2 in this embodiment is 1.36 mm;

[0107] When the longitudinal shortening difference is less than or equal to the second preset longitudinal shortening difference △V2 and greater than the first preset longitudinal shortening difference △V1, the cell size is increased to 1.39 times the initial cell size, wherein the first preset longitudinal shortening difference △V1 in this embodiment is 0.55 mm;

[0108] When the longitudinal shortening difference is less than or equal to the first preset longitudinal shortening difference ΔV1, increasing the cell size to 1.18 times the initial cell size;

[0109] After the cell size of the two-dimensional enhanced star-shaped unit cell increases, the crossbar length of the two-dimensional enhanced star-shaped unit cell is re-determined based on the proportional relationship.

[0110] Please continue reading Figure 4 As shown, the process of re-determining the crossbar length of the two-dimensional enhanced star-shaped unit cell based on the proportional relationship after the cell size increases according to the embodiment of the present invention includes:

[0111] Determine a proportional relationship Pr between the cell size of the two-dimensional enhanced star-shaped unit cell and the crossbar length of the two-dimensional enhanced star-shaped unit cell, wherein the proportional relationship Pr in this embodiment is Pr=∈[1.4,1.6];

[0112] After the cell size increases to 1.65 times the initial cell size, increasing the crossbar length to 1.82 times the initial crossbar length;

[0113] After the cell size increases to 1.39 times the initial cell size, increasing the crossbar length to 1.43 times the initial crossbar length;

[0114] After the cell size increases to 1.18 times the initial cell size, increasing the crossbar length to 1.24 times the initial crossbar length;

[0115] Specifically, after adjusting the length of the crossbar, the flexible sensor is re-prepared and the sensitivity is re-tested, and whether the re-prepared flexible sensor is qualified is determined based on the re-tested sensitivity, and when the re-prepared flexible sensor is determined to be unqualified, the outer cell wall thickness of the two-dimensional enhanced star-shaped unit cell is adjusted based on the re-tested sensitivity;

[0116] Specifically, the process of determining whether the re-made flexible sensor is qualified based on the re-tested sensitivity includes:

[0117] When the retested sensitivity is greater than or equal to the second preset sensitivity GF2, the flexible sensor is judged to be qualified and a qualified instruction is issued;

[0118] When the retested sensitivity is less than the second preset sensitivity GF2, the flexible sensor is determined to be unqualified, and the outer cell wall thickness of the two-dimensional enhanced star-shaped unit cell is adjusted based on the retested sensitivity.

[0119] Please continue reading Figure 4 As shown, the process of adjusting the outer cell wall thickness based on the retested sensitivity according to the embodiment of the present invention includes:

[0120] Calculating the difference between the second preset sensitivity and the retested sensitivity, and recording the obtained difference as the retested sensitivity difference;

[0121] When the retest sensitivity difference is greater than or equal to the second preset retest sensitivity difference ΔGFT2, the outer cell wall thickness is reduced to 0.53 times the initial outer cell wall thickness, wherein the second preset retest sensitivity difference ΔGFT2 in this embodiment is 350;

[0122] When the retest sensitivity difference is less than the second preset retest sensitivity difference △GFT2 and greater than or equal to the first preset retest sensitivity difference △GFT1, the outer cell wall thickness is reduced to 0.72 times of the initial outer cell wall thickness, wherein the first preset retest sensitivity difference △GFT1=200;

[0123] When the retest sensitivity difference is less than the first preset retest sensitivity difference ΔGFT1, reducing the outer cell wall thickness to 0.86 times the initial outer cell wall thickness;

[0124] After the outer cell wall thickness is reduced, the inner cell wall thickness of the two-dimensional enhanced star-shaped unit cell is re-determined based on the proportional relationship.

[0125] Please continue reading Figure 4 As shown, the process of re-determining the inner cell wall thickness of the two-dimensional enhanced star-shaped unit cell based on the proportional relationship in the embodiment of the present invention includes:

[0126] Determine a proportional relationship Tw between the thickness of the outer cell wall of the two-dimensional enhanced star-shaped unit cell and the thickness of the inner cell wall of the two-dimensional enhanced star-shaped unit cell, wherein the proportional relationship Tw=∈[1.2,1.4] in this embodiment.

[0127] The thickness of the inner cell wall of the two-dimensional enhanced star-shaped unit cell is re-determined based on the proportional relationship.

[0128] After the outer cell wall thickness is reduced to 0.22 times the initial outer cell wall thickness, the inner cell wall thickness is reduced to 0.24 times the initial inner cell wall thickness;

[0129] After the outer cell wall thickness is reduced to 0.51 times the initial outer cell wall thickness, the inner cell wall thickness is reduced to 0.52 times the initial inner cell wall thickness;

[0130] After the outer cell wall thickness is reduced to 0.66 times the initial outer cell wall thickness, the inner cell wall thickness is reduced to 0.68 times the initial inner cell wall thickness;

[0131] Please continue reading Figure 4 As shown, the process of correcting the amount of collected data during the sensitivity test of the flexible sensor based on the sensitivity deviation according to the embodiment of the present invention includes:

[0132] comparing the sensitivity deviation with a pre-stored preset sensitivity deviation;

[0133] When the sensitivity deviation is greater than or equal to the second preset sensitivity deviation ΔGFA2, the amount of collected data is increased to 1.88 times the amount of initial collected data, wherein the second preset sensitivity deviation ΔGFA2 in this embodiment is 90;

[0134] When the sensitivity deviation is less than the second preset sensitivity deviation △GFA2 and greater than or equal to the first preset re-test sensitivity difference △GFA1, the number of collected data is increased to 1.57 times the number of initial collected data, wherein the first preset sensitivity deviation △GFA1=35;

[0135] When the sensitivity deviation is less than the first preset sensitivity deviation ΔGFA1, increasing the amount of collected data to 1.26 times the amount of initial collected data;

[0136] Please continue reading Figure 4 As shown, the process of adjusting the drying time of the elastic substrate sprayed with the conductive sensitive layer to a corresponding value based on the surface area of ​​the elastic substrate in the embodiment of the present invention includes:

[0137] calculating the surface area of ​​the elastic substrate;

[0138] Calculating the difference between the surface area of ​​the elastic substrate and the pre-stored preset surface area, and recording the obtained difference as the surface area difference;

[0139] When the surface area difference is greater than or equal to the second preset surface area difference ΔS2, the drying time is increased to 1.92 times the initial drying time, wherein the second preset surface area difference ΔS2 in this embodiment is 120 mm 2 ;

[0140] When the surface area difference is less than the second preset surface area difference △S2 and greater than or equal to the first preset surface area difference △S1, the drying time is increased to 1.65 times the initial drying time, wherein the first preset surface area difference △S1 = 50 mm 2 ;

[0141] When the surface area difference is less than the first preset surface area difference ΔS1, the drying time is increased to 1.39 times of the initial drying time.

[0142] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0143] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, 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 method for preparing a wearable flexible sensor, characterized in that: include: A new elastic polymer is selected as the flexible substrate surface; The traditional two-dimensional star-shaped unit cell for designing a structure with negative Poisson's ratio characteristics is a two-dimensional enhanced star-shaped unit cell; Printing the two-dimensional enhanced star-shaped unit cell of corresponding size onto the surface of the flexible substrate to prepare an elastic substrate; Spraying a conductive sensitive layer on the plane side of the elastic substrate, drying it, wiring and packaging it to prepare a flexible sensor; Performing a sensitivity test on the prepared flexible sensor to obtain a test sensitivity; Determining whether the manufactured flexible sensor is qualified based on the test sensitivity, and determining the reason for the failure based on the test sensitivity when the manufactured flexible sensor is determined to be unqualified; After the cause is determined, a corresponding treatment method is generated based on the determined cause; Generate a corresponding instruction based on the determined processing method, and transmit the instruction to the corresponding component so that the component re-fabricates the flexible sensor with the re-determined preparation parameters; When the manufactured flexible sensor is determined to be qualified, a qualified instruction is issued, and the manufacturing of the flexible sensor is completed.

2. The method for preparing a wearable flexible sensor according to claim 1, characterized in that: The process of determining whether the manufactured flexible sensor is qualified based on the sensitivity includes: Comparing the obtained test sensitivity with the pre-stored preset sensitivity; When the test sensitivity is greater than or equal to a second preset sensitivity, the flexible sensor is judged to be qualified and a qualified instruction is issued; When the test sensitivity is less than the second preset sensitivity and greater than or equal to the first preset sensitivity, the flexible sensor is determined to be unqualified, and whether the flexible sensor is qualified is re-determined based on the length of the elastic substrate of the manufactured flexible sensor; When the test sensitivity is less than the first preset sensitivity, the flexible sensor is determined to be unqualified, and the reason why the manufactured flexible sensor is unqualified is determined based on the sensitivity difference, wherein the sensitivity difference is the difference between the first preset sensitivity and the test sensitivity.

3. The method for preparing a wearable flexible sensor according to claim 2, characterized in that: The process of re-determining whether the flexible sensor is qualified based on the length of the elastic substrate of the manufactured flexible sensor comprises: Measuring the length of the elastic substrate, and recording the measured length as the test substrate length; Comparing the test substrate length with a pre-stored preset substrate length; When the test substrate length is less than or equal to the preset substrate length, the test tension of the flexible sensor is changed, and the test tension is reduced based on the substrate length difference, and the reduction amplitude of the test tension is proportional to the substrate length difference, and whether the flexible sensor is qualified is re-determined after reducing the test tension, wherein the substrate length difference is the difference between the preset substrate length and the test substrate length; When the test substrate length is greater than the preset substrate length, the manufactured flexible sensor is determined to be unqualified, and the reason why the manufactured flexible sensor is unqualified is determined based on the sensitivity difference.

4. The method for preparing a wearable flexible sensor according to claim 2, characterized in that: The process of determining the reason why the manufactured flexible sensor is unqualified based on the sensitivity difference includes: Comparing the obtained sensitivity difference with a pre-stored preset sensitivity difference, and determining the cause based on the comparison result; When the sensitivity difference is less than or equal to a first preset sensitivity difference, it is determined that the reason why the manufactured flexible sensor is unqualified is that the size of the two-dimensional enhanced star-shaped unit cell in the flexible sensor does not meet the standard, and the size of the two-dimensional enhanced star-shaped unit cell is determined based on the longitudinal shortening amount of the flexible sensor; When the sensitivity difference is greater than the first preset sensitivity difference and less than or equal to the second preset sensitivity difference, it is determined that the reason why the manufactured flexible sensor is unqualified is that the number of data collected during the sensitivity test of the flexible sensor does not meet the standard, and the number of data collected during the sensitivity test of the flexible sensor is corrected based on the sensitivity deviation, wherein the sensitivity deviation is the difference between the sensitivity difference and the first preset sensitivity difference; When the sensitivity difference is greater than the second preset sensitivity difference, it is determined that the reason why the flexible sensor is unqualified is that the drying time of the planar side of the elastic substrate in the flexible sensor after spraying the conductive sensitive layer does not meet the standard, and the drying time for the elastic substrate sprayed with the conductive sensitive layer is adjusted to a corresponding value based on the surface area of ​​the elastic substrate.

5. The method for preparing a wearable flexible sensor according to claim 4, characterized in that: The process of adjusting the size of the two-dimensional enhanced star-shaped unit cell comprises: Obtaining the longitudinal shortening amount of the flexible sensor during the test; Calculating the difference between the pre-stored preset longitudinal shortening amount and the longitudinal shortening amount, and recording the obtained difference as the longitudinal shortening amount difference; Increasing the cell size based on the longitudinal shortening difference, wherein the increase in the cell size is proportional to the longitudinal shortening difference; After the cell size is increased, the crossbar length of the two-dimensional enhanced star-shaped unit cell is re-determined based on the proportional relationship.

6. The method for preparing a wearable flexible sensor according to claim 5, characterized in that: The process of re-determining the crossbar length of the two-dimensional enhanced star-shaped unit cell based on the proportional relationship after the cell size increases includes: Determining the proportional relationship between the cell size and the crossbar length; Re-determining the length of the crossbar based on the proportional relationship, and re-preparing the flexible sensor and re-testing the sensitivity after adjusting the length of the crossbar; Whether the remanufactured flexible sensor is qualified is determined based on the retested sensitivity, and when the remanufactured flexible sensor is determined to be unqualified, the outer cell wall thickness of the two-dimensional enhanced star-shaped unit cell is adjusted based on the retested sensitivity.

7. The method for preparing a wearable flexible sensor according to claim 6, characterized in that: The process of adjusting the outer cell wall thickness based on the retested sensitivity includes: Calculating the difference between the preset sensitivity and the retested sensitivity, and recording the obtained difference as the retested sensitivity difference; The outer cell wall thickness is reduced based on the remeasurement sensitivity difference, and the reduction range of the outer cell wall thickness is proportional to the remeasurement sensitivity difference. After the outer cell wall thickness is reduced, the inner cell wall thickness of the two-dimensional enhanced star-shaped unit cell is re-determined based on the proportional relationship.

8. The method for preparing a wearable flexible sensor according to claim 7, characterized in that: The process of re-determining the inner cell wall thickness of the two-dimensional enhanced star-shaped unit cell based on the proportional relationship includes: Determining a proportional relationship between the thickness of the outer cell wall and the thickness of the inner cell wall; The inner cell wall thickness is re-determined based on the proportional relationship.

9. The method for preparing a wearable flexible sensor according to claim 4, characterized in that: The process of correcting the amount of data collected during the sensitivity test of the flexible sensor based on the sensitivity deviation includes: comparing the sensitivity deviation with a pre-stored preset sensitivity deviation; The amount of data collected during the sensitivity test is increased based on the sensitivity deviation, and the increase in the amount of data collected is proportional to the sensitivity deviation.

10. The method for preparing a wearable flexible sensor according to claim 4, characterized in that: The process of adjusting the drying time of the elastic substrate sprayed with the conductive sensitive layer to a corresponding value based on the surface area of ​​the elastic substrate comprises: calculating the surface area of ​​the elastic substrate; Calculating the difference between the surface area of ​​the elastic substrate and the pre-stored preset surface area, and recording the obtained difference as the surface area difference; The drying time is increased based on the surface area difference, and the increase in the drying time is proportional to the surface area difference.

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