Sweat sensor and sweat sensing system

Abstract

A sweat sensor is provided, which includes: a sweat-conducting electrode layer including an insulating layer, a conductive electrode disposed in the insulating layer, and a first through-hole that penetrates the insulating layer and the conductive electrode; an adhesive layer disposed on the insulating layer and having a second through-hole communicating with the first through-hole; and a water-absorbing diffusion layer disposed on the adhesive layer and covering the second through-hole. A sweat sensing system having a plurality of such sweat sensors is also provided. The sweat sensor of the present invention can simultaneously perform real-time continuous detection of the sweating amount and the electrolyte concentration, and can avoid interference with the electrolyte concentration detection caused by the mixing of old and new sweat.

Description

Technical Field

[0001] The present invention belongs to the technical field of sensors, and more specifically, relates to a sweat sensor and a sweat sensing system. Background Art

[0002] During human movement, abnormal changes in the composition of sweat are related to blood concentration levels and can directly indicate the health status of the human body. For example, Na + is the most abundant electrolyte in human sweat and is an important basis for sweat secretion. Its concentration can reflect different types of water-salt metabolism disorders in the human body. For example, athletes, soldiers, workers, etc. may experience severe dehydration and develop hypernatremia when working in extreme environments (such as intense exercise, overheated fire fighting, etc.). The Na + concentrations in their sweat and blood are far higher than the normal values. If the water and electrolytes are not judged and replenished in time, it is very likely to cause serious physiological threats and even death.

[0003] Currently, traditional sweat sensors cannot simultaneously perform real-time continuous detection of sweat volume and electrolyte concentration, and cannot avoid the interference caused by the mixing of new and old sweat to the detection of electrolyte concentration. Summary of the Invention

[0004] To solve the above technical problems existing in the prior art, the present invention provides a sweat sensor and a sweat sensing system that can simultaneously perform real-time continuous detection of sweat volume and electrolyte concentration, and can avoid the interference caused by the mixing of new and old sweat to the detection of electrolyte concentration.

[0005] The sweat sensor provided by one aspect of the embodiments of the present invention includes: a sweat guiding electrode layer, including an insulating layer, a conductive electrode disposed within the insulating layer, and a first through hole that penetrates the insulating layer and the conductive electrode; an adhesive layer disposed on the insulating layer and having a second through hole communicating with the first through hole; and a water absorption and diffusion layer disposed on the adhesive layer and covering the second through hole.

[0006] In an example of the sweat sensor provided in the above aspect, the central axis of the first through hole coincides with the central axis of the second through hole.

[0007] In an example of the sweat sensor provided in the above aspect, the conductive electrode includes a first electrode and a second electrode. The first electrode and the second electrode are located in the same plane, and the central axis of the electrode through hole of the first electrode, the central axis of the electrode through hole of the second electrode, and the central axis of the first through hole coincide.

[0008] In an example of the sweat sensor provided in the above aspect, the conductive electrode includes a first electrode and a second electrode. The first electrode and the second electrode are located in different planes, and the central axis of the electrode through-hole of the first electrode, the central axis of the electrode through-hole of the second electrode, and the central axis of the first through-hole coincide.

[0009] In an example of the sweat sensor provided in the above aspect, the sweat sensor further includes: a contact layer disposed on the surface of the insulating layer facing away from the adhesive layer, and a third through-hole communicating with the first through-hole is provided in the contact layer.

[0010] In an example of the sweat sensor provided in the above aspect, the central axis of the first through-hole coincides with the central axis of the third through-hole.

[0011] In an example of the sweat sensor provided in the above aspect, the material of the insulating layer and / or the contact layer is polydimethylsiloxane, silicone rubber or thermoplastic polyester.

[0012] In an example of the sweat sensor provided in the above aspect, when the sweat sensor is used to detect sweat, a conductance square wave curve is obtained according to the conductance value of the sweat passing through the first through-hole recorded by the conductive electrode, and the total concentration of sweat electrolytes and the total amount of sweat are simultaneously obtained through the conductance square wave curve; wherein, the amplitude of the conductance square wave curve is correlated with the total concentration of sweat electrolytes in the through-hole in real time, and the volume of the sweat passing through the through-hole and the sweating rate are correlated with the time difference between the conductance square waves in the conductance square wave curve.

[0013] A sweat sensing system provided according to another aspect of the present invention includes: a sweat guiding electrode layer including an insulating layer, a plurality of conductive electrodes disposed in the insulating layer, and a plurality of first through-holes, each first through-hole penetrating through the insulating layer and a corresponding one of the conductive electrodes; an adhesive layer disposed on the insulating layer and having a plurality of second through-holes, the second through-holes being in one-to-one correspondence and communication with the first through-holes; and a water absorption and diffusion layer disposed on the adhesive layer and covering the plurality of second through-holes.

[0014] In an example of the sweat sensing system provided in the above aspect, each conductive electrode includes a first electrode and a second electrode. The first electrode and the second electrode of each conductive electrode are located in different planes, and the first electrodes of each conductive electrode are located in the same plane, the second electrodes of each conductive electrode are located in the same plane. The central axis of the electrode through-hole of the first electrode of each conductive electrode, the central axis of the electrode through-hole of the second electrode, and the central axis of the corresponding first through-hole coincide; the plurality of conductive electrodes are arranged in an array, the first electrodes of the conductive electrodes in the same column are connected together, and the second electrodes of the conductive electrodes in the same row are connected together.

[0015] In an example of the sweat sensing system provided in the above - mentioned other aspect, the sweat sensing system further includes: a contact layer disposed on the surface of the insulating layer facing away from the adhesive layer, and the contact layer has a plurality of third through - holes, and the third through - holes are in one - to - one correspondence and communication with the first through - holes.

[0016] Advantageous effects: The sweat sensor of the present invention can simultaneously perform real - time continuous detection of the sweating amount and electrolyte concentration, and can avoid the interference caused by the mixing of new and old sweat to the electrolyte concentration detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Through the following description in conjunction with the drawings, the above - mentioned and other aspects, features, and advantages of the embodiments of the present invention will become clearer. In the drawings:

[0018] Figure 1 is a schematic structural diagram of a sweat sensor according to the first embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of the state of a wearable device having a sweat sensor according to the first embodiment of the present invention placed on the surface of the human skin;

[0020] Figure 3 is a schematic diagram of the detection principle of a conductance square - wave curve and a conductance square - wave curve graph obtained by a sweat sensor according to an embodiment of the present invention under a micro - injection pump test;

[0021] Figure 4 is a schematic structural diagram of a sweat sensor according to the second embodiment of the present invention;

[0022] Figure 5 is a schematic structural diagram of a sweat sensor according to the third embodiment of the present invention;

[0023] Figure 6 is a schematic structural diagram of a sweat sensing system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention can be implemented in many different forms, and the present invention should not be construed as being limited to the specific embodiments set forth herein. On the contrary, these embodiments are provided to explain the principles of the present invention and its practical applications, so that other technical personnel in the art can understand various embodiments of the present invention and various modifications suitable for specific intended applications.

[0025] As used herein, the term "comprising" and its variants denote open-ended terms meaning "including but not limited to". Terms such as "based on", "according to" etc. mean "at least partially based on", "at least partially according to". The term "one embodiment" and "an embodiment" mean "at least one embodiment". The term "another embodiment" means "at least one other embodiment". Terms such as "first", "second" etc. may refer to different or the same objects. Other definitions may be included below, whether explicit or implicit. Unless explicitly specified in the context, the definition of a term is consistent throughout the specification.

[0026] Figure 1 is a schematic structural diagram of a sweat sensor according to a first embodiment of the present invention. Among them, in Figure 1 (B) shows a top view of the sweat sensor according to the first embodiment of the present invention. Note that in Figure (B), in order to clearly show the electrode structure, the adhesive layer 3 and the water absorption and diffusion layer 4 are not shown; (A) shows a sectional view of the sweat sensor according to the first embodiment of the present invention taken along the line a-a' in Figure (B). Of course, the human skin system is additionally shown in Figure (A).

[0027] Referring to Figure 1 , the sweat sensor according to the first embodiment of the present invention includes a sweat guiding electrode layer 2, an adhesive layer 3 and a water absorption and diffusion layer 4.

[0028] Specifically, the sweat guiding electrode layer 2 includes an insulating layer 21, a conductive electrode (not labeled) disposed in the insulating layer 21, and a first through hole (not labeled), wherein the first through hole penetrates the insulating layer 21 and the conductive electrode. In one example, the conductive electrode includes a first electrode 221 and a second electrode 222, wherein the first electrode 221 and the second electrode 222 are located in the same plane, and the central axis of the electrode through hole (not labeled) of the first electrode 221, the central axis of the electrode through hole (not labeled) of the second electrode 222, and the central axis of the first through hole coincide.

[0029] In one example, the insulating layer 21 is mainly a flexible insulating polymer material, which may be polydimethylsiloxane, silicone rubber, thermoplastic polyester, etc. The thickness of the insulating layer 21 is between 0.1 mm and 2 mm.

[0030] The first electrode 221 and the second electrode 222 are embedded inside the insulating layer 21 and located in the middle part in the thickness direction. The first electrode 221 and the second electrode 222 can be thin-film electrodes with a certain thickness and width made of materials such as carbon nanotubes, graphene, carbon black, carbon fiber, etc., or can also be thin-film electrodes with a certain thickness and width made of other materials such as metals for conductivity testing like gold, platinum, copper, etc. The thickness of the first electrode 221 and the second electrode 222 is between 0.01 mm and 1 mm, and the width (line width) of the first electrode 221 and the second electrode 222 is less than the diameter of each through hole (such as the electrode through hole, the first through hole, etc.).

[0031] Here, no specific limitation is made on the embedding method of the first electrode 221 and the second electrode 222 in the insulating layer 21. For example, in one example, first, a layer of insulating layer 21 is prepared, and on this insulating layer 21, the first electrode 221 and the second electrode 222 located on the same horizontal plane are prepared by methods such as screen printing, and finally, another layer of insulating layer 21 is prepared on the layer of insulating layer 21, the first electrode 221, and the second electrode 222, and finally, the first electrode 221 and the second electrode 222 are embedded in the inner position of the insulating layer 21. In another example, first, a mold template in the shape of an electrode is prepared by mechanical processing, and then the prepolymer of the production material of the insulating layer 21 is poured into the mold template by the method of template replication. After curing and forming, it is peeled off to form a groove in the shape of an electrode. The first electrode 221 and the second electrode 222 are filled in the groove, and then another layer of insulating layer 21 is prepared on the first electrode 221 and the second electrode 222, and finally, the first electrode 221 and the second electrode 222 are embedded in the inner position of the insulating layer 21.

[0032] At the middle position between the insulating layer 21 and the first electrode 221 and the second electrode 222, a through hole 23 (which is composed of the first through hole, the electrode through hole, etc.) is prepared by methods such as laser cutting, the template method, or mechanical drilling. The diameter of the through hole 23 is between 0.5 mm and 2 mm; the effective test surfaces of the first electrode 221 and the second electrode 222 are exposed to the inner wall surface of the through hole 23. Preferably, the inner wall of the cylindrical through hole 23 and the surfaces of the first electrode 221 and the second electrode 222 exposed to the through hole exhibit hydrophobic properties. Therefore, hydrophobic materials can be selected through the properties of the material of the insulating layer 21 and the electrode material, or a hydrophobic through hole can be achieved by post-treatment methods, such as treating with a silane reagent.

[0033] The adhesive layer 3 is disposed on the insulating layer 21, and the adhesive layer 3 has a second through hole (not shown) communicating with the first through hole. That is, the through hole 23 penetrates through the insulating layer 21, the adhesive layer 3, and the first electrode 221 and the second electrode 222; wherein, the portion of the through hole 23 in the insulating layer 21 is defined as the first through hole, the portion of the through hole 23 in the adhesive layer 3 is defined as the second through hole, the portion of the through hole 23 in the first electrode 221 is defined as the electrode through hole of the first electrode 221, and the portion of the through hole 23 in the second electrode 222 is defined as the electrode through hole of the second electrode 222.

[0034] The adhesive layer 3 is a sticky thin film fixedly connecting the sweat guiding electrode layer 2 and the water absorption and diffusion layer 4, and includes an ultra-thin double-sided adhesive with a fixed thickness (thickness: 0.01 mm - 0.05 mm), a prepolymer of a viscoelastic polymer, etc. In one example, the adhesive layer 3 prepares a second through hole having the same size as the first through hole at the overlapping position of the first through hole of the sweat guiding electrode layer 2 by means of laser cutting, a template method, or mechanical punching, so that sweat flows through the first through hole and the second through hole. Further, the central axis of the first through hole coincides with the central axis of the second through hole.

[0035] The water absorption and diffusion layer 4 is disposed on the adhesive layer 3 and covers the second through hole. In one example, the water absorption and diffusion layer 4 is a hydrophilic material thin film, including but not limited to water absorption materials such as clothing fabrics, paper-based cellulose thin films, gels, etc. In this embodiment, the water absorption and diffusion layer 4 can use the clothing itself as the water absorption layer. Preferably, breathable and sweat-permeable sports compression clothing, wrist guards, palm guards, elbow guards, sweat bands, etc. are used as the water absorption layer. The thickness of the water absorption and diffusion layer 4 is not limited. The water absorption and diffusion layer 4 and the sweat guiding electrode layer 2 form an integrated sweat sensor through the adhesive layer 3.

[0036] Figure 2 is a schematic diagram of a state where a wearable device having a sweat sensor according to the first embodiment of the present invention is placed on the human skin surface. Refer to Figure 2 , the sweat sensor according to the first embodiment of the present invention is wrapped and fixed by an elastic fabric or a strip made of an elastomeric material to form a wearable device; and the wearable device can be integrated and compatible with fabrics such as sports compression clothing, wrist guards, palm guards, elbow guards, sweat bands, etc. to form an elastic water absorption and fixing strip device 41.

[0037] When the sweat sensor according to the embodiment of the present invention is disposed on the human skin 1, the sweat glands 14 in the subcutaneous skin 12 secrete sweat 13. When the sweat 13 is secreted from the sweat glands 14, it has a certain pressure, and the maximum can reach 70000 N / m² -2, sufficient to pump the sweat 14 into the through-hole 23 and be quickly absorbed by the water-absorbing diffusion layer 4; when the sweat 13 passes through the inner wall of the through-hole 23, the parallel electrodes (i.e., the first electrode 221 and the second electrode 222) exposed in the through-hole 23 will record the conductance values of the sweat liquid or sweat droplets passing through in real time. As Figure 3 Figure (A) in Figure 3 is a schematic diagram of the detection principle of the conductance square-wave curve. Among them, ΔT1 represents the duration of the first conductance square wave, and ΔT2 represents the duration of the second conductance square wave; and Figure (B) in Figure 3 is a conductance square-wave curve graph obtained by the sweat sensor according to the embodiment of the present invention under a micro-injection pump test.

[0038] Referring to Figure 3 , the height or amplitude of the conductance square-wave curve is correlated with the total concentration of sweat electrolytes in the through-hole 23 in real time, and the volume of the sweat droplets passing through the through-hole 23 and the sweating rate are correlated with the time difference between the appearances of the next conductance square-wave curves; therefore, the sweat sensor proposed according to the embodiment of the present invention can successfully distinguish the sweat electrolyte concentration and the sweating amount through a real-time continuous conductance square-wave curve; and at the same time has the advantage of not being interfered by the mixing of new and old sweat and affecting its accuracy.

[0039] Figure 4 Figure Figure 4 is a schematic structural diagram of the sweat sensor according to the second embodiment of the present invention. Among them, in Figure 4 Figure Figure 4 , Figure (B) shows a top view of the sweat sensor according to the second embodiment of the present invention. Note that in Figure (B), in order to clearly show the electrode structure, the adhesive layer 3 and the water-absorbing diffusion layer 4 are not shown; Figure (A) shows a sectional view of the sweat sensor according to the second embodiment of the present invention cut along the a-a' line in Figure (B). Of course, the human skin system is additionally shown in Figure (A); Figure (C) shows a schematic structural diagram of the first electrode and the second electrode in the sweat sensor according to the second embodiment of the present invention.

[0040] Referring to Figure 4 , different from Figure 1 the structure of the sweat sensor of the first embodiment shown in Figure 1 is that the first electrode 221 and the second electrode 222 are not in the same plane. For example, the second electrode 222 is above the first electrode 221, so the electrode through-holes of the second electrode 222 and the first electrode 221 overlap up and down.

[0041] Figure 5 Figure Figure 5 is a schematic structural diagram of the sweat sensor according to the third embodiment of the present invention. Among them, in Figure 5Among them, (B) shows a top view of the sweat sensor according to the third embodiment of the present invention. Note that in Figure (B), in order to clearly show the electrode structure, the adhesive layer 3 and the water absorption and diffusion layer 4 are not shown; (A) shows a sectional view of the sweat sensor according to the third embodiment of the present invention cut along the line a-a' in Figure (B). Of course, the human skin system is additionally shown in Figure (A).

[0042] Referring to Figure 5 , and Figure 1 the difference in the structure of the sweat sensor of the first embodiment shown is that: the sweat sensor according to the third embodiment of the present invention further includes a contact layer 24, which is disposed on the surface of the insulating layer 21 facing away from the adhesive layer 3, and the contact layer 24 has a third through hole (not shown) communicating with the first through hole. Further, the central axis of the first through hole coincides with the central axis of the third through hole, that is to say, the through hole 23 penetrates the contact layer 24.

[0043] The contact layer 24 has two functions: First, it is convenient to adjust the thickness of the sweat guiding electrode layer 2; Second, when the hardness of the insulating layer 21 is not suitable for direct contact with the skin, good contact and attachment with the skin can be achieved through the contact layer 24. The material of the contact layer 24 includes but is not limited to polydimethylsiloxane, silicone rubber, thermoplastic polyester, etc. The tight combination of the contact layer 24 and the insulating layer 21 can be achieved through common cross-linking bonding and other technologies.

[0044] Figure 6 is a schematic structural diagram of a sweat sensing system according to an embodiment of the present invention. For the convenience of description and introduction, Figure 6 only the conductive electrodes and the insulating layer are shown.

[0045] Referring to Figure 6 , the sweat sensing system according to the embodiment of the present invention includes a plurality of Figure 4 sweat sensors shown according to the second embodiment of the present invention, and a plurality of the sweat sensors are arranged in an array.

[0046] In this case, the insulating layers 21, adhesive layers 3, water absorption and diffusion layers 4 and / or contact layers 24 (if provided) of each sweat sensor are integrated; that is to say, a plurality of conductive electrodes are disposed in one insulating layer 21, one adhesive layer 3 and one water absorption and diffusion layer 4 are laminated on one insulating layer 21 in sequence, and one contact layer 24 is disposed on the surface of one insulating layer 21 facing away from one adhesive layer 3.

[0047] Of course, each through hole 23 also penetrates one adhesive layer 3 to form a plurality of second through holes, and also penetrates one contact layer 24 to form a plurality of third through holes. That is to say, the first through holes (including each electrode through hole), the second through holes and the third through holes correspond to each other and are connected.

[0048] In the case where multiple sweat sensor arrays are distributed, the first electrodes of the respective conductive electrodes are located in the same plane, while the second electrodes of the respective conductive electrodes are located in the same plane, and the first electrodes and the second electrodes are located in different planes. Therefore, all the first electrodes of the conductive electrodes in each column are connected together and connected to the column conductive terminal, and all the second electrodes of the conductive electrodes in each row are connected together and connected to the row conductive terminal. For example, in Figure 6 , all the first electrodes of the conductive electrodes in the first column are connected together and connected to the column conductive terminal 223, all the first electrodes of the conductive electrodes in the second column are connected together and connected to the column conductive terminal 224, and all the first electrodes of the conductive electrodes in the third column are connected together and connected to the column conductive terminal 225; all the second electrodes of the conductive electrodes in the first row are connected together and connected to the row conductive terminal 226, all the second electrodes of the conductive electrodes in the second row are connected together and connected to the row conductive terminal 227, and all the second electrodes of the conductive electrodes in the third row are connected together and connected to the row conductive terminal 228.

[0049] As provided above, the sweat sensing system can obtain data of multiple sampling points by arranging multiple conductive electrodes in an array, further improving the accuracy of analyzing the sweat output per unit area and the sweat electrolyte concentration.

[0050] The specific embodiments of the present invention have been described above. Other embodiments are within the scope of the appended claims.

[0051] The terms "exemplary", "example", etc. used throughout this specification mean "serving as an example, instance, or illustration", and do not mean "preferred" or "advantageous" over other embodiments. For the purpose of providing an understanding of the described technology, the detailed description includes specific details. However, these technologies can be implemented without these specific details. In some instances, well-known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described embodiments.

[0052] The optional embodiments of the embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.

[0053] The foregoing description of the content of this specification is provided to enable any ordinary person skilled in the art to implement or use the content of this specification. Various modifications to the content of this specification will be apparent to those of ordinary skill in the art, and the general principles defined herein can also be applied to other variations without departing from the scope of protection of the content of this specification. Therefore, the content of this specification is not limited to the examples and designs described herein, but is consistent with the broadest scope that conforms to the principles and novel features disclosed herein.

Claims

1. A sweat sensor, characterized in that, The sweat sensor includes: A sweat guiding electrode layer, including an insulating layer, a conductive electrode disposed within the insulating layer, and a first through-hole that penetrates through the insulating layer and the conductive electrode; An adhesive layer disposed on the insulating layer and having a second through-hole communicating with the first through-hole; A water-absorbing diffusion layer disposed on the adhesive layer and covering the second through-hole; Wherein, the inner walls of the first through-hole and the second through-hole and the surface of the conductive electrode exposed to the first through-hole present a hydrophobic state; Wherein, when using the sweat sensor to detect sweat, a conductance square wave curve is obtained according to the conductance value of the sweat passing through the first through-hole recorded by the conductive electrode, and the total concentration of sweat electrolytes and the total amount of sweat are simultaneously obtained through the conductance square wave curve; wherein, the amplitude of the conductance square wave curve is correlated with the total concentration of sweat electrolytes in real time within the through-hole, and the volume of sweat passing through the through-hole and the sweating rate are correlated with the time difference between the conductance square waves in the conductance square wave curve.

2. The sweat sensor according to claim 1, characterized in that, The central axis of the first through-hole coincides with the central axis of the second through-hole.

3. The sweat sensor according to claim 1 or 2, characterized in that, The conductive electrode includes a first electrode and a second electrode. The first electrode and the second electrode are located in the same plane, and the central axis of the electrode through-hole of the first electrode, the central axis of the electrode through-hole of the second electrode, and the central axis of the first through-hole coincide.

4. The sweat sensor according to claim 1 or 2, characterized in that, The conductive electrode includes a first electrode and a second electrode. The first electrode and the second electrode are located in different planes, and the central axis of the electrode through-hole of the first electrode, the central axis of the electrode through-hole of the second electrode, and the central axis of the first through-hole coincide.

5. The sweat sensor according to claim 1, characterized in that, The sweat sensor further includes: a contact layer disposed on the surface of the insulating layer facing away from the adhesive layer, and the contact layer has a third through-hole communicating with the first through-hole.

6. The sweat sensor according to claim 5, characterized in that, The central axis of the first through-hole coincides with the central axis of the third through-hole.

7. A sweat sensing system, characterized in that, The sweat sensing system includes: A sweat guiding electrode layer, including an insulating layer, a plurality of conductive electrodes disposed within the insulating layer, and a plurality of first through-holes, each first through-hole penetrating through the insulating layer and a corresponding one of the conductive electrodes; An adhesive layer disposed on the insulating layer and having a plurality of second through-holes, the second through-holes communicating with the first through-holes in a one-to-one correspondence; A water-absorbing diffusion layer disposed on the adhesive layer and covering the plurality of second through-holes; Wherein, the inner walls of the first through-hole and the second through-hole and the surface of the conductive electrode exposed to the first through-hole present a hydrophobic state; When using the sweat sensor to detect sweat, a conductance square wave curve is obtained according to the conductance value of the sweat passing through the first through-hole recorded by the conductive electrode, and the total concentration of sweat electrolytes and the total amount of sweat are simultaneously obtained through the conductance square wave curve; wherein, the amplitude of the conductance square wave curve is correlated with the total concentration of sweat electrolytes in real time within the through-hole, and the volume of sweat passing through the through-hole and the sweating rate are correlated with the time difference between the conductance square waves in the conductance square wave curve.

8. The sweat sensing system according to claim 7, characterized in that, Each conductive electrode includes a first electrode and a second electrode. The first electrode and the second electrode of each conductive electrode are located in different planes. The first electrodes of all the conductive electrodes are located in the same plane, and the second electrodes of all the conductive electrodes are located in the same plane. The central axis of the electrode through-hole of the first electrode of each conductive electrode, the central axis of the electrode through-hole of the second electrode, and the central axis of the corresponding first through-hole coincide; The multiple conductive electrodes are arranged in an array. The first electrodes of the conductive electrodes in the same column are connected together, and the second electrodes of the conductive electrodes in the same row are connected together.

9. The sweat sensing system according to claim 7 or 8, characterized in that, The sweat sensing system further includes: a contact layer disposed on the surface of the insulating layer facing away from the adhesive layer. The contact layer has a plurality of third through-holes, and the third through-holes communicate with the first through-holes in a one-to-one correspondence.

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