stretchable flexible sensor and deformation detection method thereof
阅读说明：本技术 一种可拉伸柔性传感器及其形变检测方法 (stretchable flexible sensor and deformation detection method thereof ) 是由 胡镇邦 于 2019-05-17 设计创作，主要内容包括：本发明公开了一种可拉伸柔性传感器的形变检测方法,包括以下步骤：(1)将可拉伸柔性传感器设置于可穿戴物品中供使用者穿着、并设置一检测电路；(2)启动检测电路,其对进行集成于可穿戴物品中的传感器形变时的电容、电阻、电感变化所引起的变化进行感知和检测；(3)检测电路对传感器进行充电,当检测电路感测到传感器发生形变时,通过将传感器的电信号与参考电压进行比较输出对应于可拉伸柔性传感器产生形变的波形信号,对信号进行整形和量化,对传感器进行放电完成对使用者运动状态数据的感知和采集。本发明还公开了可拉伸柔性传感器,其包括两电极层以及一电介质层,相邻的两电极相互连接且构成Z字形设置于可拉伸弹性织物上。(The invention discloses a deformation detection method of stretchable flexible sensors, which comprises the following steps of (1) arranging the stretchable flexible sensors in a wearable article for a user to wear and arranging detection circuits, (2) starting the detection circuits, sensing and detecting changes caused by changes of capacitance, resistance and inductance when the sensors integrated in the wearable article deform, (3) charging the sensors by the detection circuits, comparing electric signals of the sensors with reference voltage when the detection circuits sense that the sensors deform, outputting waveform signals corresponding to the stretchable flexible sensors to deform, shaping and quantifying the signals, and discharging the sensors to finish sensing and collecting motion state data of the user.)
1, A method for detecting deformation of stretchable flexible sensor, comprising the steps of:
(1) disposing a stretchable flexible sensor in a wearable article for wearing by a user; a detection circuit of the stretchable flexible sensor is arranged, and the detection circuit is connected with the stretchable flexible sensor in the wearable article;
(2) a start detection circuit which senses the change of the waveform of the charge and discharge signal in the detection circuit caused by the change of capacitance and/or resistance and inductance when the stretchable flexible sensor integrated in the wearable article deforms;
(3) the detection circuit charges the sensor, when the detection circuit senses that the stretchable flexible sensor deforms, the detection circuit compares the electric signal of the sensor with the reference voltage to output a waveform signal which corresponds to the stretchable flexible sensor and deforms, then the signal is shaped and quantized, and finally the sensor is discharged to complete the whole measurement period, so that the sensing and the acquisition of the motion state data of a user are completed.
2. The method for detecting deformation of a stretchable flexible sensor according to claim 1, wherein the detection circuit of the stretchable flexible sensor comprises: the device comprises a direct current constant current source, a voltage comparator, an analog multiplexer, a clock generator, a switch circuit and a logic control circuit; the logic control circuit comprises a charge and discharge control logic circuit, a register and a counter.
3. The deformation detecting method of stretchable flexible sensor according to claim 2, wherein the analog multiplexer is connected to the stretchable flexible sensor in the wearable article, and further connected to the dc constant current source through the switch circuit S1 and to the low potential terminal of the power source through the switch circuit S2, the analog multiplexer is further connected to the voltage comparator, the switch circuit S1 and the switch circuit S2 are respectively connected to the charge and discharge control logic, the charge and discharge control logic is connected to the clock generator, the clock generator is further connected to the register and the counter, and the voltage comparator is respectively connected to the register and the counter; the DC constant current power supply provides power for the detection circuit, and the clock generator provides a clock turnover signal for the logic control circuit.
4. The deformation sensing method of a stretchable flexible sensor according to claim 3, wherein the step (3) further comprises the steps of:
(31) the logic control circuit closes the switch circuit S1, opens the switch circuit S2 to charge the sensor, when the detection circuit senses that the stretchable flexible sensor deforms, the electric signal of the sensor is sent to the end of the voltage comparator through the analog multiplexer, the waveform signal corresponding to the stretchable flexible sensor deforming is output by comparing the electric signal with the reference voltage of the other end of the voltage comparator, then the logic circuit shapes and quantizes the signal, and finally the switch circuit S1 is opened, and the switch circuit S2 is closed to discharge the sensor to complete the whole measurement period.
5. The deformation sensing method of a stretchable flexible sensor according to claim 4, wherein the step (31) further comprises the steps of:
(311) the logic control circuit precharges the sensor to a preset voltage by closing the switch circuit S1, and discharges the sensor through closing the switch circuit S2 to simultaneously measure the discharge waveform of the sensor.
A stretchable flexible sensor in for carrying out the method of any of claims 1-5, wherein the sensor is disposed in a wearable article to be worn by a user, the sensor comprises an electrode dielectric structure comprising two electrode layers and a dielectric layer separating the two electrode layers and providing capacitance on the electrode layers, the electrode layers comprising or more electrodes, the dielectric layer comprising or more dielectrics, adjacent electrodes are connected to each other and disposed in a zigzag pattern on the stretchable elastic fabric, and when the sensor is elastically deformed by stretching, the capacitance and/or resistance, inductance of the electrode dielectric structure changes to cause corresponding changes in charge and discharge signal waveforms.
7. A stretchable flexible sensor according to claim 6,
the stretchable elastic fabric further comprises or multi-layer superposed electrode dielectric structures, wherein each superposed electrode dielectric structure comprises electrode layers and dielectric layers, the electrode layers are arranged on the electrode dielectric structures or superposed on the superposed electrode dielectric structures, the dielectric layers in the superposed electrode dielectric structures are connected with the electrode layers on the electrode dielectric structures or the superposed electrode dielectric structures, each electrode layer comprises or more electrodes, each dielectric layer comprises or more dielectrics, and two adjacent electrodes are connected with each other and arranged on the stretchable elastic fabric in a Z shape.
8. A stretchable flexible sensor according to claim 6, wherein the electrodes and dielectric are made of a flexible stretchable fabric.
9. A stretchable flexible sensor according to claim 6, characterised in that the conductive component of the electrodes is a network of discrete but interconnected conductive particles interspersed between fabric fibres or or more of conductive yarns, conductive fibres, conductive polymers.
10. A stretchable flexible sensor according to claim 6, wherein the dielectric is a microparticle or a high dielectric constant nanoparticle or a conductive material.
Technical Field
The invention relates to the technical field of flexible sensor detection, in particular to stretchable flexible sensors and a deformation detection method thereof.
Background
The digital acquisition and analysis of the large-amplitude human motion has -wide application value in the industries of motion, health and fitness, medical treatment, human-computer interface and entertainment.
At present, rigid materials are mostly adopted and have the characteristics of high hardness, low strain capacity and the like in schemes for adapting human body movement measurement based on strain sensors and other non-flexible sensors mainly applied to other industries such as motor, mechanical manufacturing and the like. This is a significant mismatch with the need to measure human motion, which typically requires sensors with low stiffness and high strain characteristics to reduce the wearer's perception of obstruction in the motion. This also increases the cost and complexity of the measurement system.
On the other hand , solutions based on structural optics and machine vision analysis have become increasingly popular with the rapid development of artificial intelligence in the image and vision processing field in recent years, but such solutions typically require expensive camera settings and complex optical structure designs and are implemented in conjunction with a large number of human body modeling algorithms, which make visual solutions significantly deficient in recognition range, real-time, cost, and even recognition rate of specific angular positions, and present a significant privacy risk, and also solutions based on inertial sensors, when used alone or in small numbers, avoid the sensor based in part on rigid deformation from coupling to the obstructive sensation of soft and flexible structures like the human body and provide excellent feedback on dynamic movements, but still do not completely solve the problem of wearing comfort when performing multi-point monitoring covering 3D of the whole body and do not give good approximation of slow movements or static positions.
In recent years, sensors based on flexible conductive polymer type, which are excellent in matching with mechanical properties of human body and stretchable fabric, have become a new choice for application in the field of wearing, and such sensors are classified into resistive and capacitive sensors according to sensing types, wherein resistive sensors have characteristics of simple manufacturing process, low cost, etc., but are more sensitive to environmental parameters (such as temperature and humidity), and have disadvantages of drift of output values thereof due to time, strain rate and number of operation cycles.
Disclosure of Invention
The present invention aims to provide deformation detection methods for stretchable flexible sensors and flexible sensors thereof, which are applied to detection of deformation of flexible sensors disposed on wearable devices, and sense and monitor human body movement status of users by detecting flexible sensors disposed on wearable devices and deformation data thereof.
The invention particularly discloses a unique deformation detection circuit and a detection method, which are used for sensing a flexible sensor arranged on wearable equipment, wherein the detection circuit can be composed of discrete devices or integrated circuits, and can be integrated on the wearable equipment to meet the requirement of sensing the deformation of the flexible sensor at any time, so that the sensing of the deformation of the flexible sensor arranged on the wearable equipment is realized, and the real-time motion parameters of a human body are further monitored.
In order to achieve the purpose, the invention adopts the technical scheme that:
A method for detecting deformation of a stretchable flexible sensor, comprising the following steps:
(1) disposing a stretchable flexible sensor in a wearable article for wearing by a user; a detection circuit of the stretchable flexible sensor is arranged, and the detection circuit is connected with the stretchable flexible sensor in the wearable article;
(2) a start detection circuit which senses the change of the waveform of the charge and discharge signal in the detection circuit caused by the change of capacitance and/or resistance and inductance when the stretchable flexible sensor integrated in the wearable article deforms;
(3) the detection circuit charges the sensor, when the detection circuit senses that the stretchable flexible sensor deforms, the detection circuit compares the electric signal of the sensor with the reference voltage to output a waveform signal which corresponds to the stretchable flexible sensor and deforms, then the signal is shaped and quantized, and finally the sensor is discharged to complete the whole measurement period, so that the sensing of the motion state of a user and the data acquisition are completed.
(4) And (4) repeating the step (3) to finish the sensing of the motion state of the user and the data acquisition in a plurality of measurement periods.
As a further improvement of , the detection circuit of the stretchable flexible sensor comprises a direct current constant current source, a voltage comparator, an analog multiplexer, a clock generator, a switch circuit and a logic control circuit, wherein the logic control circuit comprises a charge and discharge control logic circuit, a register and a counter.
As a further improvement of , the analog multiplexer is connected with a stretchable flexible sensor in a wearable article, and is connected with a direct current constant current source through a switch circuit S1 and connected with a low potential end of a power supply through a switch circuit S2, the analog multiplexer is also connected with a voltage comparator, the switch circuit S1 and the switch circuit S2 are respectively connected with a charge and discharge control logic circuit, the charge and discharge control logic circuit is connected with a clock generator, the clock generator is also respectively connected with a register and a counter, the voltage comparator is respectively connected with the register and the counter, the direct current constant current power supply provides power for a detection circuit, and the clock generator provides a clock turnover signal for the logic control circuit.
As a further improvement of , the step (3) further comprises the steps of:
(31) the logic control circuit closes the switch circuit S1, opens the switch circuit S2 to charge the sensor, when the detection circuit senses that the stretchable flexible sensor deforms, the electric signal of the sensor is sent to the end of the voltage comparator through the analog multiplexer, the waveform signal corresponding to the stretchable flexible sensor deforming is output by comparing the electric signal with the reference voltage of the other end of the voltage comparator, then the logic circuit shapes and quantizes the signal, and finally the whole measurement period is completed by opening the switch circuit S1 and closing the switch circuit S2 to discharge the sensor.
As a further improvement of , the step (31) further comprises the steps of:
(311) the logic control circuit firstly pre-charges the sensor to a preset voltage by closing the switch circuit S1, then discharges the sensor by closing the switch circuit S2, and simultaneously measures the discharge waveform of the sensor.
A stretchable flexible sensor for implementing the method comprises electrode dielectric structure including two electrode layers and dielectric layer for separating the two electrode layers and providing capacitance on the electrode layers, wherein the electrode layers include or more electrodes, the dielectric layer includes or more dielectrics, two adjacent electrodes are connected with each other and arranged on the stretchable elastic fabric in a zigzag manner, and when the stretchable elastic fabric is subjected to elastic stretching deformation, the capacitance and/or resistance and inductance change of the electrode dielectric structure can cause corresponding change of charge and discharge signal waveform.
As a further improvement of , the stretchable elastic fabric further comprises a or multi-layer superposed electrode dielectric structure, which comprises a electrode layer and a dielectric layer, and is arranged on the electrode dielectric structure or superposed on the superposed electrode dielectric structure, the dielectric layer in the superposed electrode dielectric structure is connected with the electrode layer on the electrode dielectric structure or the superposed electrode dielectric structure, the electrode layer comprises or more electrodes, the dielectric layer comprises or more dielectrics, and two adjacent electrodes are connected with each other and arranged on the stretchable elastic fabric in a zigzag manner.
As a further improvement of the present invention, the electrodes and dielectric are made of flexible stretchable fabric.
As a further improvement of the invention, the conductive component of the electrode is a network of discrete but interconnected conductive particles interspersed between fabric fibers or or more of conductive yarn, conductive fiber, conductive polymer.
As a further improvement of the present invention at , the dielectric is a microparticle or a high dielectric constant nanoparticle or a conductive material.
Compared with the prior art have the advantages that:
1. according to the deformation detection method of the stretchable flexible sensor and the sensor, the detection circuit is arranged, and data of the flexible sensor arranged on the wearable equipment during deformation are sensed and detected, so that the sensing of the motion state of a user and the data acquisition are completed. The detection circuit can be composed of discrete devices or integrated circuits, and can meet the requirements of sensing the flexible sensor at any time by integrating the detection circuit on the wearable equipment, and further monitoring the motion of the human body by sensing the flexible sensor arranged on the wearable equipment; the flexible sensor provided can realize the integration of the flexible sensor and the traditional fabric manufacturing process on the basis of low cost, has the characteristics of flexibility, high strain degree, low environmental sensitivity and the like, and is convenient to integrate into clothes and wearing equipment.
2. The stretchable flexible sensor provided by the invention is based on the performance of a capacitive sensor, the main components of the stretchable flexible sensor comprise electrodes and a dielectric medium, the electrodes and the dielectric medium are all made of stretchable fabric, and the stretchable flexible sensor can be formed by using the same traditional textile processing technology as that used in manufacturing, and has the advantages of small volume, high efficiency, good data accuracy, low cost, easiness in mass production and deduction.
3. The deformation detection method of the stretchable flexible sensor and the sensor provided by the invention adopt flexible and flexible circuits, are a great leap in the technical field of flexible sensors, and have the capability of overcoming the defects in the prior art, and the circuits provided in the deformation detection method of the stretchable flexible sensor and the sensor provided by the invention can be arranged on wearable equipment, can meet the requirements of easily putting on and taking off the circuits, can be directly applied to the acquisition of various motion data of human bodies, and are convenient to use and widely applied to .
To more clearly illustrate the structural features and effects of the present invention, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic circuit diagram of a stretchable flexible sensor detection circuit in the present invention;
FIG. 2 is a schematic diagram of a layer structure of a stretchable flexible sensor provided by the present invention;
FIG. 3 is a schematic view of the combined structure of the stretchable flexible sensor provided by the present invention;
FIG. 4 is a schematic view of a stacked stretchable flexible sensor according to the present invention;
FIG. 5 is a schematic view of the stretchable flexible sensor provided by the present invention in a stretched configuration;
FIG. 6 is a schematic view of the stretchable flexible sensor according to the present invention in a stretched state after being stacked;
FIG. 7 is a schematic structural diagram of a stretchable flexible sensor structure layered connection detection circuit provided by the present invention;
FIG. 8 is a schematic diagram of a stretchable flexible sensor connection detection circuit provided by the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only partial embodiments of of the present invention, rather than all embodiments.
Referring to fig. 1 to 8, the deformation detecting method of the stretchable flexible sensor provided in this embodiment includes the following steps:
(1) disposing a stretchable flexible sensor in a wearable article for wearing by a user; a detection circuit of the stretchable flexible sensor is arranged, and the detection circuit is connected with the stretchable flexible sensor in the wearable article;
(2) a start detection circuit which senses the change of the waveform of the charge and discharge signal in the detection circuit caused by the change of capacitance and/or resistance and inductance when the stretchable flexible sensor integrated in the wearable article deforms;
(3) the detection circuit charges the sensor, when the detection circuit senses that the stretchable flexible sensor deforms, the detection circuit compares the electric signal of the sensor with the reference voltage to output a waveform signal which corresponds to the stretchable flexible sensor and deforms, then the signal is shaped and quantized, and finally the sensor is discharged to complete the whole measurement period, so that the sensing of the motion state of a user and the data acquisition are completed.
(4) And (4) repeating the step (3) to finish the sensing of the motion state of the user and the data acquisition in a plurality of measurement periods.
Referring to fig. 1, in the deformation detection method of the stretchable flexible sensor provided in this embodiment, the detection circuit of the stretchable flexible sensor includes: the device comprises a direct current constant current source, a voltage comparator, an analog multiplexer, a clock generator, a switch circuit and a logic control circuit; the logic control circuit comprises a charge and discharge control logic circuit, a register and a counter.
The analog multiplexer in the circuit is connected with the stretchable flexible sensor in the wearable article, in addition, the analog multiplexer is connected with a direct current constant current source through a switch circuit S1 and is connected with a low potential end of a power supply through a switch circuit S2, the analog multiplexer is also connected with a voltage comparator, the switch circuit S1 and the switch circuit S2 are respectively connected with a charge and discharge control logic circuit, the charge and discharge control logic circuit is connected with a clock generator, the clock generator is also respectively connected with a register and a counter, and the voltage comparator is respectively connected with the register and the counter; the DC constant current power supply provides power for the detection circuit, and the clock generator provides a clock turnover signal for the logic control circuit.
In the deformation detection method of the stretchable flexible sensor in this embodiment, the step (3) further includes the following steps:
(31) the logic control circuit closes the switch circuit S1, opens the switch circuit S2 to charge the sensor, when the detection circuit senses that the stretchable flexible sensor deforms, the electric signal of the sensor is sent to the end of the voltage comparator through the analog multiplexer, the waveform signal corresponding to the stretchable flexible sensor deforming is output by comparing the electric signal with the reference voltage of the other end of the voltage comparator, then the logic circuit shapes and quantizes the signal, and finally the whole measurement period is completed by opening the switch circuit S1 and closing the switch circuit S2 to discharge the sensor.
In the method for detecting deformation of a stretchable flexible sensor in this embodiment, the step (31) further includes the steps of:
(311) the logic control circuit firstly pre-charges the sensor to a preset voltage by closing the switch circuit S1, then discharges the sensor by closing the switch circuit S2, and simultaneously measures the discharge waveform of the sensor.
Referring to fig. 2, 3 and , the stretchable flexible sensor for implementing the method comprises a electrode dielectric structure, wherein the electrode dielectric structure comprises a two-electrode-
Referring to fig. 4, the stretchable flexible sensor in this embodiment further includes layers or multiple layers of stacked electrode dielectric structures, the electrode dielectric structures on the sensor can be stacked by the stacked electrode dielectric structures, including
The stretchable sensor structure is made up of at least three layers of stretchable fabric that can make up electrode dielectric structures that can be stacked by stacking electrode dielectric structures that are disposed outside the electrode dielectric structures, the inner dielectric layer of the electrode dielectric structures that is disposed in the middle layer being a non-conductive dielectric fabric, both layers outside the dielectric fabric being conductive fabrics, the conductive fabrics or conductive polymer materials on both layers on the outer layer forming a zigzag pattern and attached to the elastic fabric, the fabric structure comprising stretchable or non-stretchable fibers or a combination of both that can be woven or knitted in fabric form in a stretched manner in or more directions, see fig. 7 and 8.
When the three layers of stretchable fabric are combined at , the three layers form a capacitor with the conductive fabric acting as an electrode and the non-conductive fabric acting as a dielectric, and when the stretchable fabric is deformed, the capacitance and/or resistance of the electrode sum will change with the geometry of the sensor, wherein the capacitance of the capacitor depends on the thickness separating the electrode fabric and the non-conductive fabric and the thickness of the overlapping area of the electrodes of the conductive fabric, and the inductance of the capacitor depends on the angular spacing of the zigzag structures in the electrode fabric.
Referring to fig. 3 and 4, the stretchable flexible sensor is in an unstretched state, and referring to fig. 5 and 6, the stretchable flexible sensor is in a stretched state; the above figures show how a stretchable flexible sensor structure can be used in a stretch sensing configuration, where the area of the stretchable flexible sensor and/or the separation of the electrodes changes when the stretchable flexible sensor is stretched and contracted, which results in a change in the sensor capacitance. The inductance of the electrodes may also change as they extend and contract.
In the stretchable flexible sensor in the embodiment, the electrodes and the dielectric are made of flexible stretchable fabric.
In the stretchable flexible sensor of this embodiment, the conductive component of the electrode is a network of discrete but interconnected conductive particles interspersed between fabric fibers or or more of conductive yarns, conductive fibers, conductive polymers.
In the stretchable flexible sensor of the present embodiment, the dielectric is a microparticle or a nanoparticle with a high dielectric constant or a conductive material.
The strain detection method and the strain detection sensor of the stretchable flexible sensor in the embodiment have the key design points that:
1. according to the deformation detection method and the sensor of the stretchable flexible sensor, the sensing and data acquisition of the motion state of a user are completed through sensing and monitoring the deformation data of the flexible sensor arranged on the wearable device, and the sensor is convenient and efficient. The detection circuit can be composed of discrete devices or integrated circuits, and can meet the requirements of sensing the flexible sensor at any time by integrating the detection circuit on the wearable equipment, and further monitoring the motion of the human body by sensing the flexible sensor arranged on the wearable equipment; the flexible sensor provided can realize the integration of the flexible sensor and the traditional fabric manufacturing process on the basis of low cost, has the characteristics of flexibility, high strain degree, low environmental sensitivity and the like, and is convenient to integrate into clothes and wearing equipment.
2. The stretchable flexible sensor provided in the present embodiment is based on the performance of a capacitive sensor, whose main components, including electrodes and dielectric, are made of stretchable fabric, and can be formed using the same conventional textile processing techniques as used in manufacturing, compact, reliable in operation, low in cost, easy to use, and easy to push .
3. The deformation detection method of the stretchable flexible sensor and the sensor provided by the invention adopt flexible and flexible circuits, are a great leap in the technical field of flexible sensors, and have the capability of overcoming the defects in the prior art, and the circuits provided by the deformation detection method of the stretchable flexible sensor and the sensor provided by the invention can be arranged on wearable equipment, can meet the requirements of easily putting on and taking off the circuits, can be directly applied to the detection of various human motion data, and has application .
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
- 上一篇：一种医用注射器针头装配设备
- 下一篇：一种便携式自供能水凝胶应变传感器的制备方法