CN113063826B - Wearable perspiration rate sensor and assembling method thereof - Google Patents
Wearable perspiration rate sensor and assembling method thereof Download PDFInfo
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- CN113063826B CN113063826B CN202110292339.3A CN202110292339A CN113063826B CN 113063826 B CN113063826 B CN 113063826B CN 202110292339 A CN202110292339 A CN 202110292339A CN 113063826 B CN113063826 B CN 113063826B
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- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/048—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance for determining moisture content of the material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
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Abstract
The invention relates to a wearable perspiration rate sensor and an assembly method thereof, the sensor comprises a plurality of layers of fabrics, each layer of fabric is provided with an electrode, the fabrics and the electrodes are arranged at intervals, the fabrics are used as a substrate and a humidity sensitive medium of the electrodes, each layer of fabrics and the electrodes form a humidity sensor, the capacitance value or the resistance value output by the humidity sensor according to the change of the humidity is also changed, and the capacitance value or the resistance value and the response time of the humidity sensor are compared to obtain the perspiration rate and the change rate of the perspiration rate; the assembling method comprises the following steps: selecting hollow fibers with hygroscopicity to prepare a fabric, and performing lamination treatment and planarization treatment on the fabric; processing an electrode on the surface of the flattened fabric by adopting an ink-jet printing process; and carrying out environment test on the electrode, and calibrating the electrical characteristics of the electrode in different humidity environments. The fabric is used as the substrate, is more suitable for being applied to the body surface of a human body, is more suitable for wearing, and can monitor the change of the human perspiration rate in real time.
Description
Technical Field
The invention relates to the technical field of humidity sensors, in particular to a wearable perspiration rate sensor and an assembly method thereof.
Background
The human body perspiration rate reflects the sweat amount discharged by a unit skin area of a human body in unit time, and can cooperate with the body temperature to reflect the health parameters of the human body such as the body temperature regulation state, the moisture indication and the like in real time. The perspiration rate sensor generally adopts a humidity sensor as a basic detection unit, and the body temperature sensor is generally realized by various temperature sensors.
Based on the detection data of the perspiration rate and the body temperature of the human body, the real-time analysis and judgment can be carried out on the health condition, and early warning is provided when the health indication is reduced. For example, the method can be used for analyzing the physical indexes of athletes in the sports training process so as to achieve the optimal training effect; the body state monitoring system can also be used for monitoring and analyzing the body state of workers in a high-temperature environment in real time, so that early warning is timely carried out when the physical health indication is reduced, and the physical health of the workers is ensured.
The existing human body perspiration rate detection scheme mainly comprises a weight difference method, a patch sweat absorption method, a ventilating sweat sac method and the like, the defects of complex analysis method, poor detection accuracy, incapability of realizing real-time detection and the like exist universally, the real-time test analysis of human body health states and physiological indexes through perspiration rate detection is severely restricted, and the application of the real-time test analysis to people with high perspiration rates, such as athletes or workers in high-temperature environments, is difficult to carry out in practical scenes.
The humidity sensor in the prior art usually uses silicon and gallium arsenide as a hard substrate, is not bendable and has poor adhesiveness, and is not suitable for flexible human skin surface detection. In the case of moisture sensitive media, ceramic-like materials are also not applicable in flexible, bendable scenes. Another big problem is that the substrate and the humidity sensitive medium layer of the existing humidity sensor are independent, the structure is complex and relatively thick, the existing humidity sensor cannot be effectively attached to the daily wearable wrist protection fabric, and the existing humidity sensor is not feasible.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the problems that the sensor in the prior art is incompatible with fabric and cannot be applied to the health monitoring field, and provide a wearable perspiration rate sensor combining fabric and an electronic device.
In order to solve the technical problem, the invention provides a wearable perspiration rate sensor which comprises a plurality of layers of fabrics, wherein each layer of fabric is provided with an electrode, the fabrics and the electrodes are arranged at intervals, the fabrics are used as a substrate and a humidity sensitive medium of the electrodes, each layer of fabrics and the electrodes form a humidity sensor, capacitance values or resistance values output by the humidity sensors according to the change of humidity are also changed, the capacitance values or the resistance values and the response time of the two humidity sensors are compared to obtain the perspiration rate, and the capacitance values or the resistance values and the response time of the three humidity sensors are compared to obtain the change rate of the perspiration rate.
In one embodiment of the invention, the plurality of electrodes arranged on different layers of the fabric are distributed at different positions of the fabric, and the longitudinal projections of the plurality of layers of electrodes do not overlap.
In one embodiment of the invention, the electrodes are interdigitated electrodes that are sprayed onto the fabric using an ink jet printing process.
In one embodiment of the invention, a temperature sensor is also arranged on the inner wall of the fabric located at the innermost layer.
In one embodiment of the invention, a protective layer is provided on the temperature sensor and the electrode located on the outermost layer.
In order to solve the technical problem, the invention also provides an assembly method of the wearable perspiration rate sensor, which comprises the following steps: selecting hollow fibers with hygroscopicity to prepare fabrics, performing lamination treatment on the fabrics, and performing flattening treatment on the surface of each layer of the fabrics; processing an electrode on the surface of the flattened fabric by adopting an ink-jet printing process, and immediately carrying out curing and sintering after ink-jet is finished; and carrying out environment test on the electrode, testing the capacitance value or the resistance value of the electrode in different environments, and calibrating the electrical characteristics of the electrode in different humidity environments.
In one embodiment of the present invention, the step of performing environmental testing on the electrode is: fixing a humidity sensor consisting of fabric and electrodes on a measuring plate, and placing the humidity sensor into a humidity cavity; the capacitance or resistance value of the electrode in the humidity sensor can be read in real time by connecting the lead wire of the electrode pin to the LCR meter; setting the variation range of the humidity value of the cavity from 10% to 90%, and setting a plurality of sampling points to measure and calibrate the electrical characteristic response of each electrode from low humidity to high humidity; the sensor is placed in an environment humidity of 40%, the bottom of the sensor is in contact with a high-humidity environment of 70-90%, and a plurality of sampling points are arranged to simulate the sweating condition of the body surface.
In one embodiment of the invention, the humidity sensor is subjected to constant-temperature drying treatment before the electrode is subjected to the environmental test, and each drying treatment and environmental test time are kept for more than half an hour.
In one embodiment of the invention, a temperature sensor is applied to the bottom layer of the fabric, the temperature sensor is a temperature-sensitive resistor, and the temperature-sensitive resistor is subjected to an environmental test, and the steps comprise: fixing a sensor on a measuring plate, and putting the sensor into a constant-temperature drying box; a wiring is directly led out from a pin of the temperature-sensitive resistor and connected to the LCR meter, so that the resistance value of the temperature-sensitive resistor can be read in real time; the temperature variation range of the box body of the incubator is from 30 ℃ to 42 ℃, and a plurality of sampling points are arranged to measure the electrical characteristic response of the temperature-sensitive resistor in the body temperature range.
In one embodiment of the invention, a protective layer is applied over the temperature sensor and the electrode located on the outermost layer.
Compared with the prior art, the technical scheme of the invention has the following advantages:
the wearable perspiration rate sensor is characterized in that the fabric and the electrodes are arranged at intervals, the fabric is used as a substrate and a humidity sensitive medium of the electrodes, each layer of the fabric and the electrodes form a humidity sensor, and the perspiration rate and the change rate of the perspiration rate are obtained by comparing capacitance values or resistance values and response time in a plurality of humidity sensors, so that the perspiration rate index of a human body is monitored.
According to the assembling method of the wearable perspiration rate sensor, the electrodes are integrated on the fabric through the ink-jet printing process, and compared with a silicon substrate, a gallium arsenide substrate and a ceramic substrate in the prior art, the wearable perspiration rate sensor is more suitable for being applied to the surface of a human body and worn for use by taking the fabric as the substrate, and can monitor the change of the perspiration rate of the human body in real time; and before the electrode is used, the environment test is carried out on the electrode, the capacitance value or the resistance value of the electrode under different environments is tested, so that the electrical characteristic response of the calibration electrode from low humidity to high humidity is measured, and the capacitance value or the resistance value is converted into a corresponding humidity value.
Drawings
In order that the present disclosure may be more readily understood, a more particular description of the disclosure will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings
FIG. 1 is a schematic structural view of a wearable perspiration rate sensor of the present invention;
fig. 2 is a flow chart of a method of assembling the wearable perspiration rate sensor of the present invention.
Description reference numbers indicate: 1. a fabric; 2. an electrode; 3. a temperature sensor; 4. and a protective layer.
Detailed Description
The present invention is further described below in conjunction with the drawings and the embodiments so that those skilled in the art can better understand the present invention and can carry out the present invention, but the embodiments are not to be construed as limiting the present invention.
Referring to fig. 1, the wearable perspiration rate sensor disclosed by the invention comprises a plurality of layers of fabrics 1, wherein the fabrics 1 are made of hygroscopic hollow fibers, each layer of the fabrics 1 is provided with an electrode 2, the fabrics 1 and the electrodes 2 are arranged at intervals, the fabrics 1 are used as substrates and humidity-sensitive media of the electrodes 2, each layer of the fabrics 1 and the electrodes 2 form a humidity sensor, capacitance values or resistance values output by the humidity sensors according to the change of humidity are also changed, the capacitance values or resistance values and response times of the two humidity sensors are compared to obtain the perspiration rate, and the capacitance values or resistance values and response times of the three humidity sensors are compared to obtain the change rate of the perspiration rate.
In the embodiment, three layers of fabrics 1 are arranged, the three layers of fabrics 1 are arranged in a laminated manner, an electrode 2 is arranged at different positions of each layer of fabric 1, and longitudinal projections of the three electrodes 2 are not overlapped, so that the fabrics 1 and the electrodes 2 form three humidity sensors which are respectively positioned at different positions and different heights, and three dimensions of perspiration discharge, perspiration rate and change rate of the perspiration rate are represented by multi-domain humidity sensing; compared with a sensor made of traditional ceramics and high polymer materials, the fabric 1 is used as a substrate and a humidity sensitive medium in the embodiment, so that the practical application is enriched, the fabric can be used as a part of clothes or wristbands to absorb sweat, and the sensor is suitable for real-time monitoring of human body wearing.
In this embodiment, after the fabric 1 at the bottom layer contacts the high humidity environment, the capacitance or resistance of the electrode 2 on the fabric 1 at the bottom layer changes earliest and is the largest, the resistance is the smallest, the electrode 2 on the middle fabric 1 changes 2 times later, the capacitance or resistance of the electrode 2 on the fabric 1 at the upper layer changes the latest and is the smallest, and the resistance is the largest; calibrating according to the capacitance value or the resistance value of a single electrode 2 to obtain the perspiration amount, obtaining different vapor pressure gradients of the bottommost fabric 1, the middle fabric 1 and the topmost fabric 1 according to the difference of the capacitance values or the resistance values of the electrodes 2 so as to obtain the perspiration rate, and obtaining the change rate of the perspiration rate according to two sets of perspiration rate data obtained by the three electrodes 2.
In this embodiment, the electrode 2 is an interdigital electrode, and the interdigital electrode is sprayed on the fabric 1 by using an ink jet printing process.
Specifically, in the process of detecting the human perspiration rate, the human perspiration rate and the body temperature can cooperate to reflect health parameters such as the human body temperature regulation state and the moisture indication in real time, and the health condition can be analyzed and judged in real time based on the detection data of the perspiration rate and the human body temperature, so that, referring to fig. 1, in the embodiment, the temperature sensor 3 is further arranged on the inner wall of the innermost fabric 1, the temperature sensor 3 is a temperature-sensitive electrode, compared with a traditional thermometer or a temperature measuring gun, the temperature sensor 3 of the embodiment is arranged on the inner surface of the fabric 1, the skin surface temperature can be detected in a non-sensitive manner in real time, and the actual influence of the body surface temperature on the perspiration rate can be analyzed by combining the perspiration rate data.
Specifically, in order to protect the electrode 2 and the temperature sensor 3 arranged in the fabric 1 and prevent drift of electrical parameters, the protective layer 4 is applied on the temperature sensor 3 and the electrode 2 positioned on the outermost layer, so that the absorption rate and the transmittance of the fabric 1 to water vapor are not affected while the electrode 2 is protected.
Referring to fig. 2, the method for assembling the wearable perspiration rate sensor according to the present invention includes: selecting hollow fibers with hygroscopicity to prepare a fabric 1, carrying out lamination treatment on the fabric 1, and carrying out flattening treatment on the surface of each layer of fabric 1; processing an electrode 2 on the surface of the flattened fabric 1 by adopting an ink-jet printing process, immediately carrying out curing sintering after ink-jet is finished, and maintaining the accuracy of the electrode 2; and carrying out environment test on the electrode 2, testing capacitance values or resistance values of the electrode 2 in different environments, and calibrating electrical characteristics of the electrode 2 in different humidity environments.
In this embodiment, the laminated fabric 1 cannot be directly processed by the electrode 2, so that the surface of the fabric 1 is subjected to planarization treatment, which comprises the following steps: through the fabric 1 pressing process, the fabric is placed on a printing table of a small-sized pressing machine for 5 to 10 seconds, and the set temperature is 120 ℃ to 140 ℃.
In this embodiment, an LCR meter (digital bridge) is used to measure the capacitance or resistance of the electrode 2 in the humidity sensor, and the step of performing the environmental test on the electrode 2 is as follows: fixing a humidity sensor consisting of the fabric 1 and the electrode 2 on a measuring plate, and putting the measuring plate into a humidity cavity; the capacitance or resistance value of the electrode 2 in the humidity sensor can be read in real time by leading out a wiring from a pin of the electrode 2 and connecting the wiring to an LCR meter; setting the variation range of the humidity value of the cavity from 10% to 90%, setting a sampling point at every 10% interval, and setting 9 sampling points in total so as to measure and calibrate the electrical characteristic response of each electrode 2 from low humidity to high humidity; the sensor is placed in an environment humidity of 40%, the bottom of the sensor is in contact with a high-humidity environment of 70-90%, and a plurality of sampling points are arranged to simulate the sweating condition of the body surface.
Specifically, before the electrode 2 is subjected to the environmental test, the humidity sensor is subjected to constant-temperature drying treatment, so that the initial humidity of the fabric 1 is very low, and the drying treatment and the environmental test time are kept for more than half an hour each time, so that the water absorption and dehydration processes of the sensor are complete.
Specifically, in the process of detecting the human perspiration rate, health parameters such as the human body temperature regulation state and the moisture indication can be reflected in real time in cooperation with the body temperature, and the health condition can be analyzed and judged in real time based on the detection data of the perspiration rate and the human body temperature, in the embodiment, a temperature sensor 3 is attached to the bottom layer of a fabric 1, the temperature sensor 3 is a temperature-sensitive resistor, the temperature sensor 3 is subjected to environment test, the resistance value of the temperature-sensitive resistor is measured by adopting an LCR meter (digital bridge), and the method comprises the following steps: fixing a temperature-sensitive resistor on a measuring plate, and putting the measuring plate into a constant-temperature drying box; a wiring is directly led out from a pin of the temperature-sensitive resistor and connected to the LCR meter, so that the resistance value of the temperature-sensitive resistor can be read in real time; the temperature variation range of the box body of the incubator is from 30 ℃ to 42 ℃, one sampling point is arranged at the interval of 1 ℃, and 13 sampling points are arranged in total to measure the electrical characteristic response of the temperature sensitive resistor in the body temperature range.
Specifically, in the present embodiment, in order to protect the electrodes 2 and the temperature sensors 3 disposed in the fabric 1 and prevent the drift of the electrical parameters, the protective layer 4 is applied on the temperature sensors 3 and the electrodes 2 located on the outermost layer, so as to protect the electrodes 2 and the temperature sensors 3 without affecting the absorption rate and the transmittance of the fabric 1 to moisture.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Various other modifications and alterations will occur to those skilled in the art upon reading the foregoing description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the invention.
Claims (10)
1. A wearable perspiration rate sensor, its characterized in that: the perspiration speed measuring device comprises a plurality of layers of fabrics, wherein each layer of fabric is provided with an electrode, the fabrics and the electrodes are arranged at intervals, the fabrics are used as a substrate and a humidity sensitive medium of the electrodes, each layer of fabric and the electrodes form a humidity sensor, capacitance values or resistance values of the electrodes in the humidity sensors are changed according to humidity changes, the capacitance values or the resistance values and response time of the two humidity sensors are compared to obtain the perspiration speed, and the capacitance values or the resistance values and the response time of the three humidity sensors are compared to obtain the change rate of the perspiration speed.
2. The wearable perspiration rate sensor according to claim 1, wherein: the plurality of electrodes arranged on different layers of fabrics are distributed at different positions of the fabrics, and longitudinal projections of the multi-layer electrodes are not overlapped.
3. The wearable perspiration rate sensor according to claim 1, wherein: the electrode is an interdigital electrode, and the interdigital electrode is sprayed on the fabric by adopting an ink-jet printing process.
4. The wearable perspiration rate sensor of claim 1, wherein: and a temperature sensor is also arranged on the inner wall of the fabric positioned on the innermost layer.
5. The wearable perspiration rate sensor of claim 4, wherein: and a protective layer is arranged on the temperature sensor and the electrode positioned on the outermost layer.
6. An assembly method of a wearable perspiration rate sensor is characterized in that: the method comprises the following steps: selecting hollow fibers with hygroscopicity to prepare fabrics, carrying out lamination treatment on the fabrics, arranging electrodes on each layer of the fabrics at intervals, taking the fabrics as substrates and humidity-sensitive media of the electrodes, forming a humidity sensor by each layer of the fabrics and the electrodes, and carrying out flattening treatment on the surface of each layer of the fabrics; processing an electrode on the surface of the flattened fabric by adopting an ink-jet printing process, and immediately carrying out curing and sintering after ink-jet is finished; and carrying out environment test on the electrode, testing the capacitance value or the resistance value of the electrode in different environments, and calibrating the electrical characteristics of the electrode in different humidity environments.
7. The method of assembling a wearable perspiration rate sensor according to claim 6, wherein: the environmental test of the electrode comprises the following steps: fixing a humidity sensor consisting of fabric and electrodes on a measuring plate, and placing the humidity sensor into a humidity cavity; the capacitance value or the resistance value of the electrode in the humidity sensor can be read in real time by leading out a wiring from the electrode pin and connecting the wiring to the LCR meter; setting the variation range of the cavity humidity value from 10% to 90%, and setting a plurality of sampling points to measure and calibrate the electrical characteristic response of each electrode from low humidity to high humidity; the sensor is placed in an environment humidity of 40%, the bottom of the sensor is in contact with a high-humidity environment of 70-90%, and a plurality of sampling points are arranged to simulate the sweating condition of the body surface.
8. The method of assembling a wearable perspiration rate sensor according to claim 6, wherein: before the electrode is subjected to the environmental test, the humidity sensor is subjected to constant-temperature drying treatment, and the drying treatment and the environmental test time are kept for more than half an hour each time.
9. The method of assembling a wearable perspiration rate sensor according to claim 7, wherein: applying a temperature sensor on the bottom layer of the fabric, wherein the temperature sensor is a temperature-sensitive resistor, and carrying out environmental test on the temperature-sensitive resistor, and the method comprises the following steps: fixing a sensor on a measuring plate, and putting the sensor into a constant-temperature drying box; a wiring is directly led out from a pin of the temperature-sensitive resistor and connected to the LCR meter, so that the resistance value of the temperature-sensitive resistor can be read in real time; the temperature variation range of the box body of the constant temperature box is from 30 ℃ to 42 ℃, and a plurality of sampling points are arranged to measure the electrical characteristic response of the temperature-sensitive resistor in the body temperature range.
10. The method of assembling a wearable perspiration rate sensor according to claim 9, wherein: and applying a protective layer on the temperature sensor and the electrode positioned on the outermost layer.
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| CN115956905B (en) * | 2023-01-04 | 2023-08-11 | 广州智而康网络科技有限公司 | System for monitoring child health based on Internet of things and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH053857A (en) * | 1991-06-25 | 1993-01-14 | Matsushita Electric Ind Co Ltd | Perspiration sensor |
| WO2015058064A1 (en) * | 2013-10-18 | 2015-04-23 | University Of Cincinnati | Sweat sensing with chronological assurance |
| CN105361853A (en) * | 2014-09-02 | 2016-03-02 | 鸿富锦精密工业（深圳）有限公司 | Wearable device for monitoring human perspiration conditions |
| CN107607594A (en) * | 2017-09-07 | 2018-01-19 | 王琮 | Compound humidity-sensitive material and transducer production method for capacitance type humidity sensor |
| CN109975365A (en) * | 2019-03-12 | 2019-07-05 | 复旦大学 | A kind of wearable liquid sensor and preparation method thereof |
| CN110412487B (en) * | 2019-07-31 | 2021-04-20 | 电子科技大学 | Fabric-type flexible composite sensor and manufacturing method thereof |
| CN110542707A (en) * | 2019-09-29 | 2019-12-06 | 宁波宝贝第一母婴用品有限公司 | Fabric sensor and child safety seat |
| CN110940708A (en) * | 2019-12-16 | 2020-03-31 | 中国科学院半导体研究所 | Humidity sensor, preparation method thereof, wearable humidity sensing system and application |
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