CN115553755A - Dual-capacitor strain sensor, manufacturing method thereof and respiration monitoring belt - Google Patents
Dual-capacitor strain sensor, manufacturing method thereof and respiration monitoring belt Download PDFInfo
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Abstract
The invention provides a double-capacitor strain type sensor, a preparation method thereof and a respiration monitoring belt. The double-capacitor strain type sensor is of a laminated structure and sequentially comprises a first packaging layer, a first conducting layer, a first dielectric layer, a second conducting layer, a second dielectric layer, a third conducting layer and a second packaging layer from bottom to top; the first conducting layer and the second conducting layer form a capacitance sensing unit, and the third conducting layer and the second conducting layer form a sensing unit, namely, the sensing unit consists of two capacitance sensing units in the laminating direction and is a double-capacitance sensing unit; and each layer is composed of two units with the same structure, namely, the whole body is two symmetrical double-capacitor sensing units, so that the capacitance resolution under unit strain is greatly increased, the detection precision of the sensor is improved, and the sensor can be arranged on a breathing belt for breathing monitoring.
Description
Technical Field
The invention relates to a sensing technology and a wearable technology, in particular to a double-capacitor strain type sensor, a preparation method thereof and a respiration monitoring belt.
Background
The capacitive strain sensor is widely used for stress detection, the high-precision capacitive strain sensor is one of key factors for improving the stress detection, and the capacitive strain sensor has important significance for weak stress detection and stress detection under a high-noise background.
Respiration as one of the important physiological parameters of the human body can reflect the health condition of the human body. Respiratory monitoring is required in disease prevention and detection, exercise, breath training, and the like. The existing respiration monitoring method mainly comprises the following four steps: (1) The flow type respiration monitoring mask worn in the mouth and the nose has the defects of inconvenient portability and unsuitability for long-term wearing; (2) The gyroscope or the planar film pressure sensor is placed in a planar environment such as a bed and the like when in use, and the breath is monitored through the vibration generated by the breath, so that the gyroscope or the planar film pressure sensor has the defects of incapability of wearing and long-time use; (3) The resistance type strain sensor is placed on the chest or the abdomen when in use, and can be worn for a long time by monitoring respiration through measuring tensile strain generated by the respiration, but the linearity of the resistance type strain sensor is poor, and the resolution ratio under small strain is low, so the signal-to-noise ratio is low; (4) The inductive strain sensor is placed on the chest or the abdomen during use, respiration is monitored by measuring tensile strain generated by respiration, the inductive strain sensor is simple to prepare and comfortable to wear, but electronic monitoring equipment of the inductive strain sensor is large, the respiratory signal-to-noise ratio is low, the requirement on a use scene is high, and the inductive strain sensor cannot be worn and used for a long time. Therefore, the intelligent respiration monitor which has high signal-to-noise ratio and can be worn for a long time has good application prospect.
Disclosure of Invention
In view of the above technical situation, the present invention provides a strain gauge sensor with dual capacitors, which has high detection accuracy.
The technical scheme provided by the invention is as follows: a dual-capacitor strain sensor is shown in fig. 1 and 2, which is a laminated structure and sequentially comprises a first packaging layer 11, a first conducting layer 21, a first dielectric layer 31, a second conducting layer 22, a second dielectric layer 32, a third conducting layer 23 and a second packaging layer 12 from bottom to top;
the first conductive layer 21 is composed of two first conductive units with the same structure, which are called a first conductive unit a and a first conductive unit B, and a distance exists between the first conductive unit a and the first conductive unit B to form symmetrical distribution; moreover, the first conductive unit is composed of a first conductor 210 and a first protruding structure 211;
the second conductive layer 22 is composed of two second conductive units with the same structure, which are called a second conductive unit a and a second conductive unit B, and a distance exists between the second conductive unit a and the second conductive unit B to form symmetrical distribution; and, the second conductive unit is composed of a second conductive body 220 and a second protrusion structure 221;
the third conductive layer 23 is composed of two third conductive units with the same structure, which are called a third conductive unit a and a third conductive unit B, and a distance exists between the third conductive unit a and the third conductive unit B to form symmetrical distribution; and, the third conductive unit is composed of a third conductor 230 and a third protrusion structure 231;
the first dielectric layer 31 is composed of a first dielectric unit a and a first dielectric unit B, the first dielectric unit a completely covers the first conductor 210 of the first conductor a and does not completely cover the first protruding structure 211 of the first conductor a; the first dielectric unit B completely covers the first conductor 210 of the first conductor B and does not completely cover the first protruding structure 211 of the first conductor B;
the second dielectric layer 32 is composed of a second dielectric unit a and a second dielectric unit B, the second dielectric unit a completely covers the second conductor 220 of the second conductor a without completely covering the second protruding structure 221 of the second conductor a, and does not completely cover the first protruding structure 221 of the first conductor a; the second dielectric unit B completely covers the second conductor 220 of the second conductor B without completely covering the second protruding structure 221 of the second conductor B and without completely covering the first protruding structure 221 of the first conductor B;
after the layers are laminated, the first protruding structure 211 of the first conductive unit A and the second protruding structure 221 of the second conductive unit A have no laminated contact part; a laminated contact part exists between the first protruding structure 211 of the first conductive unit a and the third protruding structure 231 of the third conductive unit a, and is referred to as a contact part a; the first protrusion structure 211 of the first conductive unit B has no lamination contact portion with the second protrusion structure 221 of the second conductive unit B; a laminated contact part exists between the first protruding structure 211 of the first conductive unit B and the third protruding structure 231 of the third conductive unit B, and is referred to as a contact part B; the contact portion a and the contact portion B communicate through the first electrode 41; the second protrusion structure 221 of the second conductive unit a and the second protrusion structure 221 of the second conductive unit B are in communication through the second electrode 42.
Preferably, the first electrode 41 is provided with a first terminal 410 for connecting a first electrode lead; the second electrode 42 is provided with a second terminal 420 for connection to a second electrode lead; the second package layer 12 is provided with a first wiring hole 121 and a second wiring hole 122 for the first electrode lead and the second electrode lead to pass through respectively.
Preferably, the first sealing layer has elasticity, and is further preferably made of a material having high elasticity and a small value of tensile force, such as fiber cloth or elastic silicone rubber.
Preferably, the second sealing layer has elasticity, and is more preferably made of a material having high elasticity and a small value of tensile force, such as fiber cloth or elastic silicone rubber.
Preferably, the first conductive layer, the second conductive layer, and the third conductive layer each have elasticity, and more preferably, are made of a material such as liquid metal paste, elastic metal fiber cloth, elastic conductive silicone rubber, elastic conductive ionic liquid, or mixed paste of elastic metal and elastomer.
Preferably, the first electrode and the second electrode have elasticity, and are further preferably made of a material such as elastic metal fiber cloth or elastic conductive silicone rubber.
Preferably, the first dielectric layer and the second dielectric layer have elasticity, and more preferably, are made of a material such as fiber cloth, elastic silicone rubber material, TPU, TPR, and TPE.
Preferably, a zinc sulfide copper-doped thin film is arranged in the second packaging layer, and the zinc sulfide copper-doped thin film is used for introducing defects into zinc sulfide crystal lattices and is used as a light-emitting center, and has a function of changing color when being subjected to tensile strain. When the second packaging layer is not subjected to tensile strain, the zinc sulfide copper-doped film is colorless, and when the second packaging layer is subjected to tensile strain, the zinc sulfide copper-doped film changes color along with the tensile strain, so that the second packaging layer is changed into blue-green, and the blue-green brightness is enhanced along with the increase of the tensile strain.
The preparation method of the zinc sulfide copper-doped film is not limited and comprises the methods of coating, screen printing, template printing, transferring and the like.
Preferably, the dual-capacitor strain gauge sensor further comprises a data acquisition unit, a data processing unit, a data transmission unit and a battery unit. The data acquisition unit is used for acquiring capacitance values; the data processing unit is used for processing the collected capacitance value so as to obtain a stress value; the data transmission unit is used for transmitting data signals and can be wired transmission or wireless transmission. Preferably, the data acquisition unit, the data processing unit, the data transmission unit and the battery unit are integrated in a control box, and the first electrode lead and the second electrode lead are connected with the control box.
The invention also provides a preparation method of the double-capacitor strain sensor, which comprises the following steps:
(1) Preparing a first conductive layer on the surface of the first packaging layer;
(2) Covering a first dielectric layer on the surface of the first conductive layer;
(3) Preparing a second conductive layer on the surface of the first dielectric layer;
(4) Covering a second dielectric layer on the surface of the second conductive layer;
(5) Preparing a third conducting layer on the surface of the second dielectric layer;
(6) The contact portion a communicates with the contact portion B through the first electrode 41; the second protrusion structure 221 of the second conductive unit a and the second protrusion structure 221 of the second conductive unit B communicate through the second electrode 42.
Preferably, in the step (1), the first conductive layer is prepared by a method of stencil printing, screen printing, coating, transfer preparation, or the like.
Preferably, in the step (3), the second conductive layer is prepared by a method of stencil printing, screen printing, coating, transfer preparation, or the like.
Preferably, in the step (5), the third conductive layer is prepared by stencil printing, screen printing, coating, transfer preparation, or the like.
Compared with the prior art, the invention has the following beneficial effects:
(1) In the invention, the capacitive strain sensor is of a laminated structure, a first conductive layer and a second conductive layer form a capacitive sensing unit, and a third conductive layer and the second conductive layer form a sensing unit, namely, the capacitive strain sensor consists of two capacitive sensing units in the laminating direction and is a double-capacitive sensing unit; and each layer is composed of two units with the same structure, namely, the whole body is two symmetrical double-capacitor sensing units, so that the capacitance resolution under unit strain is greatly increased, and the detection precision of the sensor is improved.
(2) According to the preparation method of the double-capacitor strain sensor, the first conducting layer, the second conducting layer and the conducting layer are respectively provided with the protruding structures, and the arrangement positions of the protruding structures and the coverage degree of the dielectric layer on the protruding structures are controlled, so that the first conducting layer and the second conducting layer form conducting insulation and form conducting connection with the third conducting layer, and therefore the double-capacitor structure in the stacking direction is achieved; and the first electrode and the second electrode are arranged to connect the sensing units with symmetrical layer directions, and the method is simple and easy to operate, can be used for large-scale production, and has a good application prospect.
(3) The double-capacitor strain type sensor has high precision, can be used for detecting tensile strain under small stress or weak stress, has good application prospect, for example, can be used for respiration monitoring, and can further improve the signal-to-noise ratio of the acquired signal due to the high linearity and high resolution under the small stress of the capacitor sensor and the adoption of a double-capacitor mode, so that the respiration waveform can be accurately identified, the respiration frequency can be obtained through calculation, and the error is low.
As an implementation mode, the invention provides a respiration monitoring belt which comprises an elastic belt, a double-capacitor strain type sensor and a control unit, wherein the double-capacitor strain type sensor is arranged on the elastic belt, and the control unit comprises a data acquisition unit, a data processing unit, a data transmission unit and a battery unit.
The method for monitoring the respiration by using the respiration monitoring belt comprises the following steps:
(1) Arrange the thorax position or the belly position of waiting to detect the body in with breathing monitoring area, adjust elastic webbing length and make two electric capacity strain sensor hug closely in waiting to detect the body respiratory wave form and respiratory frequency through two electric capacity strain sensor: when the patient exhales, the chest cavity is closed, the stretching of the sensor is reduced, and the capacitance change value is gradually reduced to a wave trough; when inhaling, the chest is opened, the sensor is stretched and increased, and the capacitance change value is gradually increased to the peak. Therefore, every time a peak-trough is detected, the breath is taken; the original respiration signal is mixed with interference signals such as heart rate, limb movement and the like, the original respiration signal is transformed into a frequency domain signal through FFT (Fourier transform), and the frequency value corresponding to the maximum amplitude in the frequency domain signal is the respiration frequency value because the amplitude corresponding to the real respiration signal in the original respiration signal is the maximum.
In order to visualize the tensile strain, a zinc sulfide copper doped film is preferably provided on the second sensing layer. In an initial state, the sensor is not stretched, the zinc sulfide copper-doped film is colorless, and the respiration monitoring belt is in the original color of the material of the second packaging layer; when breathing in, the stretching of the sensor is increased, the capacitance change value is increased and gradually increased to a wave crest along with the increase of the breathing amplitude (namely, the amplitude of chest expansion caused by different breathing amplitudes such as deep breathing, shallow breathing and the like), the stretching of the zinc sulfide copper-doped film is increased along with the increase of the breathing amplitude, and the blue-green light is presented, so that the breathing monitoring belt is blue-green and is brighter along with the larger breathing amplitude; when exhaling, the sensor is stretched and is dwindled, and the capacitance variation value reduces to the trough along with the expiration range (promptly, the different expiration ranges such as deep expiration, shallow expiration lead to the range that the thorax contracts) increase and reduce gradually, the drawing that the zinc sulfide dopes the copper film and receives reduces thereupon, and along with the expiration range increase bluish green is bright dim until disappearance and resumes colorless, makes the bluish green of breathing monitoring area bright dim until disappearance and resume to the second packaging layer material original color.
The respiration monitoring belt can be used for detecting the respiration waveform and the respiration frequency of a detected body, can be used for deep respiration training and length measurement, such as measurement of chest circumference, waist circumference and hip circumference, or diameter measurement of other materials.
Drawings
Fig. 1 is a schematic diagram of an explosive structure of layers of a dual capacitance strain gauge sensor according to the present invention.
Fig. 2 is a schematic view of the layers of fig. 1 after lamination.
Fig. 3 is a schematic top view of a process for manufacturing a dual-capacitor strain gauge sensor in example 1 of the present invention.
Fig. 4 is a functional structure diagram of a control box of a dual-capacitor strain sensor in embodiment 1 of the present invention.
Fig. 5 is a schematic structural view of a respiration monitoring band in embodiment 1 of the present invention.
Fig. 6 is a respiratory rate monitoring chart of the respiratory monitoring band in embodiment 1 of the present invention.
Fig. 7 is a breath-hold breath training diagram of the breath monitoring band in example 2 of the present invention.
Fig. 8 is a graph showing the relationship between the capacitance of the dual-capacitance strain gauge sensor and the change in the length of the respiration monitoring band in embodiment 3 of the present invention.
The reference numerals in fig. 1 and 3 are: the first package layer 11, the second package layer 12, the first conductive layer 21, the second conductive layer 22, the third conductive layer 23, the first dielectric layer 31, the second dielectric layer 32, the first electrode 41, the second electrode 42, the first wiring hole 121, the second wiring hole 122, the first conductor 210, the first protrusion structure 211, the second conductor 220, the second protrusion structure 221, the third conductor 230, the third protrusion structure 231, the first terminal 410, and the second terminal 420.
The reference numerals in fig. 5 are: the sensor comprises an elastic belt 1, a double-capacitance strain type sensor 3, a control box 4 and a length adjusting buckle 5.
Detailed Description
The invention will be described in further detail below with reference to the accompanying drawings and examples, which are intended to facilitate the understanding of the invention and are not intended to limit the invention in any way.
Example 1:
in this embodiment, the dual-capacitor strain sensor is a stacked structure, and includes, from bottom to top, a first package layer 11, a first conductive layer 21, a first dielectric layer 31, a second conductive layer 22, a second dielectric layer 32, a third conductive layer 23, and a second package layer 12, as shown in fig. 3, the preparation method is as follows:
(1) Cutting the elastic fiber cloth into the size required by the first packaging layer 11 to obtain the first packaging layer 11;
(2) As shown in fig. 3 (a), a liquid metal paste is selected to be coated on the surface of the first encapsulation layer 11 by a dispenser to prepare a first conductive layer 21; the first conductive layer 21 is composed of two first conductive units with the same structure, which are called a first conductive unit a and a first conductive unit B, and a distance exists between the first conductive unit a and the first conductive unit B to form axisymmetric distribution; and, the first conductive unit is composed of a first conductor 210 and a first protrusion structure 211;
(3) As shown in fig. 3 (b), a TPU film is coated on the surface of the first conductive layer 21 as a first dielectric layer 31; the first dielectric layer is composed of a first dielectric unit a and a first dielectric unit B, the first dielectric unit a completely covers the first conductor 210 of the first conductor a and does not completely cover the first protruding structure 211 of the first conductor a; the first dielectric unit B completely covers the first conductor 210 of the first conductor B without completely covering the first protruding structure 211 of the first conductor B;
(4) As shown in fig. 3 (c), a liquid metal paste is selected to be coated on the surface of the first dielectric layer 31 by a dispenser to prepare the second conductive layer 22; the second conductive layer 22 is composed of two second conductive units with the same structure, which are called a second conductive unit a and a second conductive unit B, and a distance exists between the second conductive unit a and the second conductive unit B to form axisymmetric distribution; the second conductive unit is composed of a second conductive body 220 and a second protruding structure 221; moreover, the second protruding structure 221 of the second conductive unit a has no lamination contact part with the first protruding structure 211 of the first conductive unit a, and the second protruding structure 221 of the second conductive unit B has no lamination contact part with the first protruding structure 211 of the first conductive unit B;
(5) As shown in fig. 3 (d), a TPU film is coated on the surface of the second conductive layer 22 as a second dielectric layer 32; the second dielectric layer is composed of a second dielectric unit a and a second dielectric unit B, the second dielectric unit a completely covers the second conductor 220 of the second conductor a without completely covering the second protruding structure 221 of the second conductor a, and does not completely cover the first protruding structure 221 of the first conductor a; the second dielectric unit B completely covers the second conductor 220 of the second conductor B without completely covering the second protruding structure 221 of the second conductor B and without completely covering the first protruding structure 221 of the first conductor B;
(6) As shown in fig. 3 (e), a liquid metal paste is selected to be coated on the surface of the second dielectric layer 22 by a stencil printing dispenser to prepare a third conductive layer 23; the third conductive layer 23 is composed of two third conductive units with the same structure, which are called a third conductive unit a and a third conductive unit B, and a distance exists between the third conductive unit a and the third conductive unit B to form axisymmetric distribution; the third conductive unit is composed of a third conductor 230 and a third protruding structure 231; moreover, the third protruding structure 231 of the third conductive unit a and the first protruding structure 211 of the first conductive unit a have a laminated contact portion, which is referred to as contact portion a, and the third protruding structure 231 of the third conductive unit B and the first protruding structure 211 of the first conductive unit B have a laminated contact portion, which is referred to as contact portion B;
(7) As shown in fig. 3 (f), elastic conductive silicone rubber is applied between the contact portion a and the contact portion B as a first electrode 41 for communicating the contact portion a and the contact portion B; elastic conductive silicon rubber is coated between the second protruding structure 221 of the second conductive unit A and the second protruding structure 221 of the second conductive unit B to serve as a second electrode 42, and the second protruding structure 221 of the second conductive unit A is communicated with the second protruding structure 221 of the second conductive unit B;
also, the first electrode 41 is provided with a first terminal 410 for connection to a first electrode lead; the second electrode 42 is provided with a second terminal 420 for connection to a second electrode lead;
(8) Coating a zinc sulfide copper-doped film on the surface of elastic fiber cloth, then cutting the elastic fiber cloth into a size required by the second packaging layer 12, and arranging two small holes in the middle as a first wiring hole 121 and a second wiring hole 122 to obtain the second packaging layer 12; the first electrode lead is led out from the first wiring hole 121, the second electrode lead is led out from the second wiring hole 122, and then the first electrode lead and the second electrode lead are connected with the control box in a conductive manner by welding, as shown in fig. 4, the control box comprises a data acquisition unit, a central computing processing unit, a wireless transmission unit and a battery unit. The data acquisition unit is used for acquiring capacitance values; the central computing and processing unit is used for processing the collected capacitance value so as to obtain a stress value; the wireless sending unit is used for wirelessly transmitting the data signal.
This two electric capacity strain gauge sensors can be applied to breathing monitoring area that changeable colour is adjustable, as shown in fig. 5, breathing monitoring area includes elastic webbing 1, sets up this two electric capacity strain gauge sensors 3 on elastic webbing 1, carries out length control through setting up length adjustment buckle 5. The control box 4 is disposed above the second encapsulation layer.
The method for monitoring the respiration by using the respiration monitoring belt comprises the following steps:
arrange the thorax position or the belly position of human body in with breathing monitoring area, adjust elastic webbing length and make two electric capacity strain type sensors hug closely in the health, open the switch of control box, connect cell-phone APP or computer bluetooth, connect successful back, click and send data button, cell-phone APP or computer receive the waveform and the respiratory frequency of the breathing that detect through electric capacity strain type sensor:
in an initial state, the sensor is not stretched, the zinc sulfide copper-doped film is colorless, and the respiration monitoring belt is in the original color of the material of the second packaging layer; when the breathing is performed, the chest is opened, the stretching of the sensor is increased, the capacitance change value is increased, and gradually increases to a wave crest along with the increase of the breathing amplitude, the stretching of the zinc sulfide copper-doped film is increased along with the increase of the breathing amplitude, and the zinc sulfide copper-doped film presents blue-green light, so that the breathing monitoring belt is blue-green and the blue-green light is brighter along with the increase of the breathing amplitude; when exhaling, the sensor is tensile to be dwindled, and the capacitance variation value reduces to along with exhaling the range increase and reduce gradually to the trough, the tensile that zinc sulfide copper-doped film received reduces thereupon, and along with exhaling the range increase blue-green is bright to become dark until disappearing and resume colourless, make the blue-green of breathing monitoring area bright dim until disappearing and resume to second packaging layer material original color. Therefore, every time a peak-trough is detected, the breath is taken; the original respiration signal is mixed with interference signals such as heart rate, limb movement and the like, the original respiration signal is transformed through FFT (Fourier transform), a time domain signal is converted into a frequency domain signal, and the frequency value corresponding to the maximum amplitude in the frequency domain signal is the respiration frequency value because the amplitude corresponding to the real respiration signal in the original respiration signal is the maximum. Fig. 6 is a signal acquired when the respiration monitoring band monitors respiration.
Example 2:
in this embodiment, the structure of the dual-capacitance strain gauge sensor is the same as that of embodiment 1.
In this embodiment, a method for manufacturing a dual-capacitor strain gauge sensor is substantially the same as that in embodiment 1, except for the following steps:
(1) Preparing a first packaging layer 11 by taking elastic conductive silicone rubber slurry and performing screen printing;
(2) Selecting elastic conductive silicone rubber slurry, and preparing a first conductive layer 21 on the surface of the first packaging layer 11 through screen printing;
(3) Screen printing elastic silicon rubber on the surface of the first conductive layer 21 to serve as a first dielectric layer 31;
(4) Selecting elastic conductive silicone rubber slurry, and preparing a second conductive layer 22 and a first conductive electrode on the surface of the first dielectric layer 31 through screen printing;
(5) Screen printing elastic silicon rubber on the surface of the second conductive layer 22 to serve as a second dielectric layer 32;
(6) Selecting elastic conductive silicone rubber slurry, and preparing a third conductive layer 23 on the surface of the second dielectric layer 22 through screen printing;
(7) Selecting elastic conductive silicone rubber slurry between the contact part A and the contact part B, and preparing a first electrode 41 by screen printing; selecting elastic conductive silicon rubber paste between the second protruding structure 221 of the second conductive unit A and the second protruding structure 221 of the second conductive unit B, and preparing a second electrode 42 through screen printing;
(8) Elastic silicon rubber is screen-printed on the surface of the third conducting layer 23 to serve as the second packaging layer 12, and a zinc sulfide copper-doped film is screen-printed on the surface of the second packaging layer 12.
The double-capacitor strain sensor can be applied to a breathing monitoring belt with adjustable color change, and the structure of the breathing monitoring belt is the same as that of the breathing monitoring belt in the embodiment 1. In contrast, in this embodiment, the respiration monitoring zone is used for deep breathing training, for example, holding a breath for more than 20 seconds after a deep inhalation. Generally, a human body can hardly keep breath holding for more than 20 seconds continuously and stably without training, the respiratory monitoring belt is used for assisting in carrying out strict training, the deep breathing lung is filled with air, the heart leaves the chest wall, and the actual lung volume and the chest shape of the deep breathing breath holding at each time can be kept consistent or as close as possible. The training can be used for breast cancer patients to ensure that the radioactive rays accurately hit the tumor target and minimize the radiation dose to the heart. The specific use method is as follows:
placing a respiration monitoring belt at the position of the chest or the abdomen of a human body, adjusting the length of an elastic belt to enable a double-capacitor strain type sensor to be tightly attached to the body, opening a switch of a control box, connecting a mobile phone APP or a computer Bluetooth, and clicking a data sending button after successful connection; cell-phone APP or computer receive the wave form of the breathing that detects through two electric capacity strain transducer, carry out the deep breathing training of "breathing in deeply-holding breath 20 seconds-exhaling deeply" through the APP suggestion, the colour change in the monitoring zone of breathing among the training process does: primary color-cyan-primary color, the cyan brightness remained unchanged for a period of 20 seconds of breath holding. Fig. 7 is a signal monitoring diagram in deep breathing training using the respiration monitoring band.
Example 3:
in this embodiment, the color-variable adjustable respiration monitoring band structure is the same as the respiration monitoring band in embodiment 1. In contrast, in the present embodiment, the respiration monitoring band is used for the chest circumference measurement, and the method is as follows:
the respiration monitoring belt is worn in front of the chest, the adjusting control box is positioned right in front of the human body, and the length of the elastic belt is adjusted to enable the double-capacitor strain type sensor to be tightly attached to the body; the switch of the control box is opened, the mobile phone APP or the computer Bluetooth are connected, after the connection is successful, the chest circumference mode is selected, and the data sending button is clicked.
BreathingWhen the monitoring belt is stretched, the dual-capacitor strain sensor is stretched to generate capacitance change. The relation curve of the measured capacitance value and the length change of the respiration monitoring band when the double-capacitance strain type sensor leaves the factory, the length change of the respiration monitoring band = (the length L of the respiration monitoring band after being stretched-the initial length L of the respiration monitoring band) 0 ) Initial length L of respiratory monitoring zone 0 . In the present embodiment, as shown in fig. 8, the capacitance value of the dual-capacitance strain gauge sensor increases linearly.
Cell-phone APP or computer bluetooth receive the capacitance value that detects through two capacitance strain gauge sensors and be C, obtain the length change of breathing monitoring area according to figure 8, then breathe the actual length (being the chest circumference) in monitoring area and be: initial length L of respiration monitoring band 0 +L 0 X length change of the respiration monitoring band.
In addition, the respiration monitoring belt can also be used for waistline, hip circumference and the like, and the measuring method is the same as that of the above.
The above embodiments are described in detail to explain the technical solutions and advantages of the present invention, and it should be understood that the above embodiments are only specific examples of the present invention and are not intended to limit the present invention, and any modifications and improvements made within the scope of the principles of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A double-capacitor strain sensor is of a laminated structure and sequentially comprises a first packaging layer (11), a first conducting layer (21), a first dielectric layer (31), a second conducting layer (22), a second dielectric layer (32), a third conducting layer (23) and a second packaging layer (12) from bottom to top; the method is characterized in that:
the first conducting layer (21) consists of two first conducting units with the same structure, namely a first conducting unit A and a first conducting unit B, and a distance exists between the first conducting unit A and the first conducting unit B to form symmetrical distribution; the first conductive unit is composed of a first conductor (210) and a first protruding structure (211);
the second conducting layer (22) consists of two second conducting units with the same structure, namely a second conducting unit A and a second conducting unit B, and the second conducting units A and the second conducting units B are spaced to form symmetrical distribution; and the second conductive unit is composed of a second conductive body (220) and a second protruding structure 221;
the third conducting layer (23) consists of two third conducting units with the same structure, namely a third conducting unit A and a third conducting unit B, and a distance exists between the third conducting unit A and the third conducting unit B to form symmetrical distribution; the third conductive unit is composed of a third conductor (230) and a third protruding structure (231);
the first dielectric layer consists of a first dielectric unit A and a first dielectric unit B, the first dielectric unit A completely covers a first conductor (210) of the first conductor A and does not completely cover a first protruding structure (211) of the first conductor A; the first dielectric unit B completely covers the first conductor (210) of the first conductor B and does not completely cover the first protruding structure (211) of the first conductor B;
the second dielectric layer is composed of a second dielectric unit A and a second dielectric unit B, the second dielectric unit A completely covers the second conductor (220) of the second conductor A, but not completely covers the second protruding structure (221) of the second conductor A, and not completely covers the first protruding structure (221) of the first conductor A; the second dielectric unit B completely covers the second conductor (220) of the second conductor B without completely covering the second protruding structure (221) of the second conductor B and without completely covering the first protruding structure (221) of the first conductor B;
after the layers are laminated, the first protruding structure (211) of the first conductive unit A and the second protruding structure (221) of the second conductive unit A are not provided with a laminated contact part; the first protruding structure 211 of the first conductive unit a) and the third protruding structure 231 of the third conductive unit a have a laminated contact portion, which is referred to as a contact portion a; the first protruding structure (211) of the first conductive unit B and the second protruding structure (221) of the second conductive unit B have no laminated contact part, and the first protruding structure (211) of the first conductive unit B and the third protruding structure (231) of the third conductive unit B have laminated contact parts which are called contact parts B; the contact portion A and the contact portion B are communicated through a first electrode (41); the second protruding structure (221) of the second conductive unit a and the second protruding structure (221) of the second conductive unit B are communicated through the second electrode (42).
2. The dual capacitor strain gauge sensor of claim 1, wherein: the first electrode (41) is provided with a first terminal (410) for connecting a first electrode lead; the second electrode (42) is provided with a second terminal (420) used for connecting a second electrode lead, and the second packaging layer (12) is provided with a first wiring hole (121) and a second wiring hole (122) respectively used for the first electrode lead and the second electrode lead to penetrate out.
3. The dual capacitor strain gauge sensor of claim 1, wherein: the first packaging layer has elasticity and is preferably made of fiber cloth and elastic silicone rubber.
4. The dual capacitor strain gauge sensor of claim 1, wherein: the second packaging layer has elasticity, and is preferably made of one or two materials of fiber cloth and elastic silicon rubber.
5. The dual capacitor strain gauge sensor of claim 1, wherein: the first conducting layer, the second conducting layer and the third conducting layer are respectively elastic and preferably made of one or more of liquid metal slurry, elastic metal fiber cloth, elastic conductive silicone rubber, elastic conductive ionic liquid and mixed slurry of elastic metal and an elastomer.
6. The dual capacitor strain gauge sensor of claim 1, wherein: the first electrode and the second electrode respectively have elasticity, and are preferably made of one or two materials of elastic metal fiber cloth and elastic conductive silicon rubber.
7. The dual capacitor strain gauge sensor of claim 1, wherein: the first dielectric layer and the second dielectric layer are respectively elastic, and preferably made of one or more of fiber cloth, elastic silicone rubber material, TPU, TPR and TPE material.
8. The dual capacitor strain gauge sensor of claim 1, wherein: and a zinc sulfide copper-doped film is arranged in the second packaging layer.
9. The dual capacitor strain gauge sensor of claim 1, wherein: the double-capacitor strain sensor also comprises a data acquisition unit, a data processing unit, a data transmission unit and a battery unit;
preferably, the data acquisition unit, the data processing unit, the data transmission unit and the battery unit are integrated in a control box, and the first electrode lead and the second electrode lead are connected with the control box.
10. The method for manufacturing a dual-capacitor strain gauge sensor as defined in any of claims 1 to 9, wherein: the method comprises the following steps:
(1) Preparing a first conductive layer on the surface of the first packaging layer;
(2) Covering a first dielectric layer on the surface of the first conductive layer;
(3) Preparing a second conductive layer on the surface of the first dielectric layer;
(4) Covering a second dielectric layer on the surface of the second conductive layer;
(5) Preparing a third conductive layer on the surface of the second dielectric layer;
(6) The contact portion A and the contact portion B are communicated through a first electrode (41); the second protruding structure (221) of the second conductive unit a and the second protruding structure (221) of the second conductive unit B are communicated through the second electrode (42).
11. The method of manufacturing a dual-capacitor strain gauge sensor as defined in claim 10, wherein: in the step (1), the preparation method of the first conductive layer comprises one or more of template printing, screen printing, coating of a dispenser and transfer preparation;
preferably, in the step (3), the preparation method of the second conductive layer includes one or more of stencil printing, screen printing, dispenser coating and transfer preparation;
preferably, in the step (5), the preparation method of the third conductive layer includes one or more of stencil printing, screen printing, dispenser coating and transfer preparation.
12. A respiration monitoring belt comprising an elastic belt, a control unit, and the dual-capacitor strain gauge sensor of any one of claims 1 to 9 disposed on the elastic belt, the control unit comprising a data acquisition unit, a data processing unit, a data transmission unit, and a battery unit.
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Effective date of registration: 20240219 Address after: No. 189 Guangming Road, Zhuangshi street, Zhenhai District, Ningbo City, Zhejiang Province Patentee after: Ningbo Renhe Technology Co.,Ltd. Country or region after: China Patentee after: NINGBO INSTITUTE OF MATERIALS TECHNOLOGY & ENGINEERING, CHINESE ACADEMY OF SCIENCES Address before: 315201 no.1818 Zhongguan West Road, Zhenhai District, Ningbo City, Zhejiang Province Patentee before: Ningbo Renhe Technology Co.,Ltd. Country or region before: China |