CN109730679B - Wearable respiration detection device and respiration measurement method - Google Patents
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- CN109730679B CN109730679B CN201811523766.2A CN201811523766A CN109730679B CN 109730679 B CN109730679 B CN 109730679B CN 201811523766 A CN201811523766 A CN 201811523766A CN 109730679 B CN109730679 B CN 109730679B
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Abstract
The invention provides a wearable breath detection device and a breath measurement method, and relates to the field of intelligent wearable equipment. The device comprises a close-fitting garment body, a respiration sensor and a signal processor. The breathing sensor is fixed at the part of the garment body corresponding to the chest cavity and comprises a strain sensor and electrode materials fixed at two ends of the strain sensor; the strain sensor comprises a conductive inner core and an elastic packaging layer. And the signal processor is fixed on the garment body and used for converting the signals output by the breathing sensor into visual data. The device has high fit degree with human body, simple structure and high sensitivity. The invention provides a respiration measuring method which is simple and effective and can detect and obtain the respiration frequency and amplitude information of a measured person in real time.
Description
Technical Field
The invention relates to the field of intelligent wearable equipment, in particular to a wearable breath detection device and a breath measurement method.
Background
At present, a sensor for testing a respiratory signal mainly comprises a breathing mask type sensor or a waistband type sensor made of hard materials, which is not in accordance with human body aesthetic engineering, has large volume and inconvenient carrying and cannot realize real-time monitoring. Therefore, an intelligent garment capable of directly detecting a respiratory signal is needed, and the intelligent garment is convenient to carry, practical and effective.
The published wearable sensor fabrics or belts for detecting respiratory signals are mainly based on sheet-like materials. For example, CN 107997768A and CN 205568948U disclose methods of converting a pressure signal generated by respiration into an electric signal by a piezoelectric sheet, and the sensing sensitivity is not high. And an additional strain gauge needs to be introduced, so that the structure is complex and the flexibility is lacked.
Therefore, the flexible and wearable breath detection device is used for detecting and reflecting the breath signals of the human body in different states in real time, and has great research and practical values.
Disclosure of Invention
The invention aims to provide a wearable breath detection device which is high in fit degree with a human body, simple in structure and high in sensitivity.
Another objective of the present invention is to provide a respiration measuring method, which uses a flexible attachable respiration sensor as a measuring unit, the resistance of which changes with the change of the respiration process, and the resistance signal of which is easy to collect and process, and can detect and obtain the respiration frequency and amplitude information of the person to be measured in real time.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The invention provides a wearable breath detection device, comprising:
a close-fitting garment body;
the breathing sensor is fixed at the part of the garment body corresponding to the chest cavity of a human body and comprises a strain sensor and electrode materials fixed at the two ends of the strain sensor; the strain sensor comprises a conductive inner core and an elastic packaging layer for packaging the conductive inner core;
the signal processor is fixed on the garment body, comprises a signal acquisition module, a signal processing module, a wireless signal transmission module, a power supply module and a signal display module which are sequentially connected, and is used for converting the signals output by the respiration sensor into visual data; wherein, the signal acquisition module is connected with the respiration sensor.
Further, the strain sensor is in a yarn shape, the diameter of the strain sensor is 0.1-10 mm, and the length of the strain sensor is 0.1-20 cm.
Furthermore, the breathing sensors are arranged along the circumferential direction of the human body and are fixed at the part of the clothing body corresponding to the chest cavity of the human body.
Further, the strain sensor is prepared according to the following steps:
s1, preparing cotton yarns;
s2, soaking the cotton yarn graphene oxide solution for 20-40 min, drying, and repeating the soaking and drying steps for 2-5 times to obtain a prefabricated inner core;
s3, carbonizing the prefabricated inner core to obtain the conductive inner core;
s4, fixing the electrode materials at two ends of the conductive inner core by using conductive adhesive, and then coating PDMS on the surface of the conductive inner core to form the elastic packaging layer to obtain a prefabricated sensor;
and S5, stretching the prefabricated sensor at a speed of 0.1-2 mm/S, wherein the stretching length is 3-8 mm, and obtaining the strain sensor.
Further, the cotton yarn is formed by twisting a plurality of hydrophilic single-strand cotton yarns obtained after plasma treatment for 20-40 min.
Further, in step S3, the carbonization step is: heating to 650-950 ℃ at a rate of 1-10 ℃/min for 25-45 min.
Further, the electrode material is a metal conductive wire or an electrode yarn; the electrode yarn is made by coating a metal coating on the surface of the support yarn.
Further, still include the holder, the holder includes the clamping piece and sets up the peripheral viscose layer of clamping piece, the viscose layer with clothing body bonds in order to with signal processor fixes the clamping piece with between the clothing body.
Further, the close-fitting garment body is a vest, a men close-fitting sports garment, a women bra or a close-fitting sports garment.
The invention also provides a respiration measurement method, which uses the wearable respiration detection device to carry out respiration measurement and comprises the following steps:
s1, acquiring a real-time voltage value of the respiration sensor, processing to obtain a real-time resistance value, and comparing the real-time resistance value with a preset reference resistance value to obtain a real-time resistance change rate;
s2, according to the resistance change rate and the respiration time, taking the respiration time as a horizontal axis and taking the resistance change rate as a vertical axis, obtaining a respiration curve of the respiration sensor, wherein the respiration curve is provided with a plurality of resistance change rate wave peak values and wave trough values, two adjacent wave trough values represent single respiration, and a time interval T between two adjacent wave trough values is the single respiration time;
s3, acquiring a respiratory frequency f according to the respiratory curve, wherein the respiratory frequency is 1/T;
s4, judging the breathing state in real time according to a preset normal breathing value, judging normal breathing when the wave peak value in a single breathing time is between 95% and 105% of the normal breathing value, judging deep breathing if the wave peak value is higher than 105% of the normal breathing value, and judging shallow breathing if the wave peak value is lower than 95% of the normal breathing value;
and S5, calculating the normal respiration frequency, the deep respiration frequency and the shallow respiration frequency in unit time, and judging the state of the human body.
The wearable breath detection device and the breath measurement method provided by the embodiment of the invention have the beneficial effects that:
the invention provides a wearable respiration detection device, which can detect thoracic cavity changes caused by respiration in real time to obtain information such as respiration depth, respiration frequency and the like. In addition, the sensor in the device is a strain sensor, has good flexibility and sensitivity, is bending-resistant, can be detached and recycled at any time, has simple preparation process, and has high sensitivity while having flexibility. When the strain sensor is prepared into a yarn shape, the strain sensor accords with the processing conditions of the existing textile processing equipment, can be woven into close-fitting clothes by a textile weaving method, does not generate strong foreign body sensation, is good in fit with the face of a human body, high in comfort level and good in biocompatibility, and measured data are more accurate. The invention also provides a respiration measuring method, the wearable respiration detecting device is used for respiration measurement, the detection method is simple and effective, the flexible attachable strain sensor is used as a measuring unit, the resistance of the flexible attachable strain sensor changes along with the change of the respiration process, and the respiration frequency and amplitude information of a measured person can be detected and obtained in real time by acquiring and processing resistance signals.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a wearable breath detection device provided in embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a wearable breath detection device provided in embodiment 2 of the present invention;
FIG. 3 is a block diagram of a signal processor provided by the present invention;
fig. 4 is a breathing curve obtained by normal breathing and deep breathing of the wearable breathing detection device provided in embodiment 1 of the present invention when the wearable breathing detection device is worn by a human body.
Icon: 1-a respiration sensor; 2-electrode material; 3-a signal processor; 4-a garment body; 31-a signal acquisition module; 32-a signal processing module; 321-a filtering unit; 322-a signal amplification unit; 323-a signal processing unit; 33-a wireless signal transmission module; 34-signal display module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The following describes a wearable respiration detection device and a respiration measurement method according to embodiments of the present invention.
As shown in fig. 1 and 2, the invention provides a wearable respiration detection device, which comprises a close-fitting garment body 4, a respiration sensor 1 and a signal processor 3.
The close-fitting garment body 4 can be a vest, a close-fitting sportswear for men, a bra for women or a close-fitting sportswear, and the close-fitting sportswear can be attached to the chest of a human body as long as the garment body 4 has elasticity.
The breathing sensor 1 is fixed on the part, corresponding to the chest cavity of a human body, of the garment body 4, and the breathing sensor 1 comprises a strain sensor and electrode materials 2 fixed at two ends of the strain sensor. The strain sensor comprises a conductive inner core and an elastic packaging layer for packaging the conductive inner core. The respiration sensor 1 with the structure can obtain the respiration information of the human body according to the resistance change of the strain sensor caused by the expansion radian change of the thoracic cavity caused by the respiration of the human body, and the respiration sensor 1 has high sensitivity.
It is understood that the shape of the respiration sensor 1 changes with the shape of the conductive core of the strain sensor, and if the conductive core of the strain sensor is a sheet or a film, the respiration sensor 1 is prepared to be a flexible sheet or a film. If the conductive core of the strain sensor is in the shape of a yarn, the respiration sensor 1 prepared and formed is also in the shape of a yarn. The respiration sensor 1 may also be a bar shape, and its shape is not fixed as long as it satisfies the above-described structure.
Further, in a preferred embodiment of the present invention, the strain sensor is in the shape of a yarn, and the strain sensor has a diameter of 0.1mm to 10mm and a length of 0.1cm to 20 cm. The strain sensor in the shape is small in diameter and good in flexibility, can be used as a single yarn unit of a fabric, can be easily woven into a textile, cannot generate foreign body sensation, is high in comfort level and good in biocompatibility, can be pasted on the chest part of a human body more easily, and measured respiratory data are more accurate.
Furthermore, the respiration sensors 1 are arranged along the circumference of the human body and fixed at the part of the clothing body 4 corresponding to the chest cavity of the human body. When a person breathes, the chest cavity expands, the breathing sensor 1 arranged in the circumferential direction can be stretched, and the resistance change is more obvious.
Further, the strain sensor is prepared according to the following steps:
s1, preparing cotton yarns.
Further, the cotton yarn is formed by twisting a plurality of hydrophilic single-strand cotton yarns obtained after plasma treatment for 20-40 min. More preferably, each of the commercially available single-strand cotton yarns is first subjected to a plasma treatment for 40min to obtain hydrophilic single-strand cotton yarns. The hydrophilic single-strand cotton yarn can better adsorb the conductive material coated on the surface of the hydrophilic single-strand cotton yarn, so that the conductive material is prevented from falling off. And twisting a plurality of hydrophilic single-strand cotton yarns to form the cotton yarns.
Furthermore, the cotton yarn is formed by twisting 2-10 hydrophilic single-strand cotton yarns obtained after plasma treatment for 20-40 min, and the prepared cotton yarn is ensured to be moderate in diameter.
S2, soaking the cotton yarn in the graphene oxide solution for 20-40 min, drying, and repeating the soaking-drying steps for 2-5 times to obtain the prefabricated inner core. And through multiple dipping-drying steps, the graphene oxide layers with the multilevel structures can be assembled on the surface of the cotton yarn layer by layer.
Further, the drying temperature was 60 ℃.
In a preferred embodiment of the present invention, the step of preparing graphene oxide comprises: adding sodium nitrate into concentrated sulfuric acid, magnetically stirring for 5min, adding 4g of graphite powder, and magnetically stirring for 30min to obtain a mixed solution. Slowly adding potassium permanganate into the mixed solution, stirring for 1.5h in an ice-water bath, and then naturally reacting for 12h at 35 ℃. Then adding ice water, controlling the temperature at about 45 ℃, and adding deionized water after magnetically stirring for 1.5 h. Finally, dropwise adding hydrogen peroxide until the solution is golden yellow. And (4) centrifuging and washing until the pH value of the solution is neutral to obtain a graphene oxide solution.
Further, the concentration of the graphene oxide solution is 4-8 mg/mL. More preferably, the concentration of the graphene oxide solution is 6mg/mL, the graphene oxide solution is too high in concentration and is not easy to attach to the surface of cotton yarn, and the conductivity is affected due to too low concentration.
And S3, carbonizing the prefabricated inner core to obtain the conductive inner core. The cotton yarn loaded with the graphene oxide is subjected to reduction of the graphene oxide and high-temperature carbonization of cellulose under a high-temperature condition, and the two reactions can be simultaneously carried out at a high temperature, so that the preparation process is simplified. Meanwhile, the cotton yarn becomes conductive amorphous carbon after carbonization treatment, and the reduced graphene also has conductivity, so that the conductivity of the strain sensor is further enhanced.
Further, in step S3, the carbonization step is: heating to 650-950 ℃ at a rate of 1-10 ℃/min for 25-45 min.
More preferably, the temperature is increased to 800 ℃ at the speed of 5 ℃/min for processing for 30min, the temperature is uniformly increased, the problems that the cotton yarn is not easy to break or carbonized unevenly and the like due to the excessively high temperature increase speed in the carbonization process are ensured, the prepared conductive inner core is more uniform in texture, and the conductivity is better.
And S4, fixing the electrode material 2 at two ends of the conductive inner core by using conductive adhesive, and then coating PDMS on the conductive inner core to form the elastic packaging layer to obtain the prefabricated sensor. The elastic packaging layer can further prevent the conductive yarns from loosening on the sensor, and can also fix the shape of the conductive inner core and prevent the conductive inner core from falling off.
Further, the electrode material 2 is a metal conductive wire or an electrode yarn; the electrode yarn is made by coating a metal coating on the surface of a support yarn.
Further, the conductive yarn comprises a base yarn and a metal coating wrapping the surface of the base yarn. The base yarn is artificial fiber or natural fiber, such as terylene, silk fibroin fiber, and the like. It can be understood that the material of the metal conductive wire and the metal coating may be gold, silver, copper or other conductive metals, and the metal coating may be coated on the surface of the base yarn by evaporation or sputtering.
It can be understood that the electrode material 2 needs to be fixed at both ends of the conductive core by glue with conductivity, and errors caused by resistance at the connection position are reduced. The conductive adhesive can be one of silver conductive adhesive, gold conductive adhesive, copper conductive adhesive and carbon conductive adhesive. In the preferred embodiment of the present invention, conductive silver paste in silver conductive paste is selected as the conductive paste, and the electrode material 2 is fixedly connected to two ends of the conductive core through the conductive paste.
And S5, stretching the prefabricated sensor at a speed of 0.1-2 mm/S, wherein the stretching length is 3-8 mm, and obtaining the strain sensor. The stretching step can separate the graphene layer-level structure piled on the surface from the winding structure of the carbonized cotton yarn in a stretching state, so that the prepared strain sensor is separated or attached to the winding structure of the graphene layer-level structure and the carbonized cotton yarn in the middle of the chest expansion or stretching process, and the resistance of the strain sensor is increased or reduced.
More preferably, the prefabricated sensor is stretched at a speed of 0.5-1.5 mm/s, and the stretching length is 5 mm. The stretching speed is not too fast, the stretching length is not too long, otherwise, the structure of the conductive inner core is damaged, and the conductivity and the sensitivity of the prepared strain sensor are influenced.
The signal processor 3 is fixed on the garment body 4, comprises a signal acquisition module 31, a signal processing module 32, a wireless signal transmission module 33, a power supply module and a signal display module 34 which are sequentially connected, and is used for converting the signals output by the respiration sensor 1 into visual data; wherein, the signal acquisition module 31 is connected with the respiration sensor 1.
The electrode material 2, the signal acquisition module 31, the signal processing module 32, the wireless signal transmission module 33 and the power supply module of the respiration sensor 1 are welded with the connecting line on the circuit board to form the circuit board with the respiration detection function. The signal display module 34 is wirelessly connected to the wireless signal transmission module 33. The power module provides power for the whole circuit, as shown in fig. 3, when the respiration sensor 1 senses chest expansion or contraction, the resistance of the strain sensor changes, so that the circuit generates different voltage change signals, and the signal acquisition module 31 connected with the respiration sensor 1 acquires the voltage change signals and transmits the voltage change signals to the signal processing module 32. The signal processing module 32 includes a filtering unit 321, a signal amplifying unit 322, and a signal processing unit 323. The filtering unit 321 removes the interference signal from the voltage variation signal and then enters the signal amplifying unit 322. Since the voltage variation signal is small, the voltage variation signal needs to be amplified by the signal amplification unit 322 before entering the signal processing unit 323 for data analysis and processing. The amplified voltage variation signal is analyzed and processed by the signal processing unit 323 to obtain related respiration data, such as a real-time resistance value and a respiration curve. The respiration data is then transmitted wirelessly to the signal display module 34 via the wireless signal transmission module 33. The signal display module 34 receives the breathing data sent by the wireless signal transmission module 33, and then displays the breathing data on a terminal carrier, wherein the terminal can be a personal computer or a mobile phone, so that the breathing information can be displayed in real time.
It is understood that the power module may be a lithium battery, and the wireless signal transmission module 33 may be a CC2541 main control bluetooth chip, and may transmit the breathing data to the terminal of the signal display module 34 through a bluetooth connection. The signal acquisition module 31 and the signal processing module 32 are both in the prior art, and are not described herein.
Further, still include the holder, the holder includes the clamping piece and sets up the peripheral viscose layer of clamping piece, the viscose layer with dress body 4 bonds in order to with signal processor 3 fixes the clamping piece with between dress body 4. In the preferred embodiment of the present invention, the clamping member is made of cloth material, the adhesive layer on the periphery is a thermoplastic adhesive lining, the clamping member garment body 4 is bonded by a hot pressing method, the circuit board can be placed in the accommodating space formed by the clamping member and the garment body 4, and when the circuit board or the respiration sensor 1 is damaged, the circuit board can be repaired by detaching the clamping member or a new respiration sensor 1 is welded on the circuit board again.
The invention also provides a respiration measurement method, which uses the wearable respiration detection device to carry out respiration measurement and comprises the following steps:
s1, acquiring a real-time voltage value of the respiration sensor 1, processing to obtain a real-time resistance value, and comparing the real-time resistance value with a preset reference resistance value to obtain a real-time resistance change rate;
s2, acquiring a respiration curve of the respiration sensor 1 by taking the respiration time as a horizontal axis and the resistance change rate as a vertical axis according to the resistance change rate and the respiration time, wherein the respiration curve is provided with a plurality of resistance change rate wave peak values and wave trough values, two adjacent wave trough values represent single respiration, and a time interval T between two adjacent wave trough values is the single respiration time;
s3, acquiring a respiratory frequency f according to the respiratory curve, wherein the respiratory frequency is 1/T;
s4, judging the breathing state in real time according to a preset normal breathing value, judging normal breathing when the wave peak value in a single breathing time is between 95% and 105% of the normal breathing value, judging deep breathing if the wave peak value is higher than 105% of the normal breathing value, and judging shallow breathing if the wave peak value is lower than 95% of the normal breathing value;
and S5, calculating the normal respiration frequency, the deep respiration frequency and the shallow respiration frequency in unit time, and judging the state of the human body.
At first fix near the thorax of clothing body 4 through sewing thread through breathing sensor 1, the thorax can produce tension during breathing, and tension effect makes breathing sensor 1 to the tensile deformation in both ends, and the deformation in-process, the graphene layer grade structure of the electrically conductive inner core of strain sensor and the winding structure of carbonization cotton yarn separate under tensile state, and resistance grow makes the circuit produce different voltage signal to be gathered by signal acquisition module 31. The voltage signal is filtered by the low-pass filter, the filtered signal is amplified by the amplifier, and then the amplified signal is processed by the signal processing unit 323 to generate and output information such as respiratory frequency, respiratory amplitude and the like.
In practical process, the state of the tested person can be detected by the respiratory frequency and/or amplitude generated by the tested person in the process of movement. Before the measurement is performed on the testee, the respiration sensor 1 may be initially set based on the normal respiration state of each testee in the non-motion state, so that the accurate measurement can be performed for different users. After the movement of the testee starts, the real-time voltage value of the respiration sensor 1 can be obtained, the real-time resistance value is obtained through processing, and the real-time resistance value is compared with the preset reference resistance value to obtain the real-time resistance change rate. And then, acquiring a respiration curve of the respiration sensor 1 by taking the respiration time as a horizontal axis and the resistance change rate as a vertical axis, forming a plurality of resistance change rate wave peak values and wave trough values on the respiration curve, expressing single respiration by using two adjacent wave trough values, wherein the time interval T between the two adjacent wave trough values is the single respiration time, and the respiration frequency is 1/T. The breathing state can be judged in real time according to a preset normal breathing value. The normal respiration value has a fluctuation range, when the peak value in a single respiration time is between 95% and 105% of the normal respiration value, the normal respiration is judged, if the peak value is higher than the 105% of the normal respiration value, the deep respiration is judged, and if the peak value is lower than the 95% of the normal respiration value, the shallow respiration is judged. And calculating the normal respiration frequency, the deep respiration frequency and the shallow respiration frequency in unit time, and judging the state of the human body.
Compared with the traditional respiratory frequency detection technology, the technical scheme provided by the invention does not need a testee to wear a nose mask, a nose clip or a mouth piece, and is more in line with human ergonomics, and the discomfort and the tension of the testee in the measuring process are reduced; the respiratory frequency of the testee can be dynamically detected for a long time without limiting the activity of the testee; in addition, the respiration sensor 1 of the invention improves the measurement accuracy and can monitor signals in real time under the condition of movement; easy to carry, the safety has no hidden trouble, easy operation and high sensitivity.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The wearable breath detection device provided by the embodiment is manufactured according to the following steps:
(1) preparing a graphene oxide solution: 2g of sodium nitrate is added into 120ml of concentrated sulfuric acid, magnetic stirring is carried out for 5 minutes, 4g of graphite powder is added, and magnetic stirring is carried out for 30 minutes. Then 20g of potassium permanganate was slowly added and stirred in an ice-water bath for 1.5 h. The reaction system naturally reacts for 12h at the temperature of 35 ℃, 90ml of ice water is added, the temperature is controlled to be about 45 ℃, and 700ml of deionized water is added into a beaker after magnetic stirring is carried out for 1.5 h. Finally, dropwise adding hydrogen peroxide until the solution is golden yellow. And (4) centrifuging and washing until the pH value of the solution is neutral, so as to obtain a graphene oxide solution with the concentration of 6 mg/mL.
(2) Preparation of the respiration sensor 1:
1) preparing cotton yarns: commercially available single-strand cotton yarns with the thickness of 5 yarns and the length of 10cm are subjected to air plasma treatment for 40min under high power to obtain hydrophilic single-strand cotton yarns, and then the 5 hydrophilic single-strand cotton yarns are twisted to obtain the cotton yarns.
2) Preparing a prefabricated inner core: and (3) soaking the cotton yarn in the graphene oxide solution for 30min, drying at 60 ℃, and repeating the soaking-drying process for three times to obtain the prefabricated inner core.
3) Carbonizing: and (3) putting the prefabricated inner core into a tubular furnace for carbonization, wherein the temperature rise speed of the tubular furnace is 5 ℃/min, and treating for 30min at the temperature of 800 ℃ to obtain the conductive inner core.
4) And (3) packaging a strain sensor: fixing copper wires serving as electrode materials 2 at two ends of the conductive inner core by conductive silver paste, and then packaging the surface of the conductive inner core by adopting PDMS to obtain the prefabricated sensor.
5) Stretching: and (3) stretching the prefabricated sensor at the speed of 1mm/s, wherein the stretching length is 5mm, and thus obtaining the breathing sensor 1.
(3) Preparing a signal processing device circuit board: the electrode material 2 of the respiration sensor 1, the signal acquisition module 31, the signal processing module 32, the CC2541 main control Bluetooth chip and the lithium battery are welded on a connecting line of the same circuit board, and the CC2541 main control Bluetooth chip is connected with a computer serving as the signal display module 34 through Bluetooth.
(4) Preparation of the wearable breath detection device: as shown in fig. 1, a wearable breath detection device is obtained by sewing a respiration sensor 1 on the chest of a commercial sports tights by a flat knitting method using a polyester sewing yarn, placing a circuit board in an accommodating space formed by a clamping piece and the sports tights by a hot pressing method using a clamping piece at the waist position of the garment.
Fig. 4 is a breathing curve obtained by normal breathing and deep breathing of the wearable breathing detection device provided in embodiment 1 of the present invention when the wearable breathing detection device is worn by a human body. The graph shows the change of the breathing signal within 30s, and as can be seen from the graph, the wave peak value of the normal breathing resistance change rate is between 10 and 15, and the wave peak value of the deep breathing resistance change rate is about 30. And the average respiratory frequency can be obtained from the graph to be 2.5 s/time, and the wearable respiratory detection device provided by the invention is shown to detect in real time, obtain the respiratory frequency and amplitude information of the tested person and monitor the human body state in real time, and the respiratory information detection method is simple and effective, so that a solid foundation is laid for the application of the respiratory information detection device in future intelligent wearable equipment.
Example 2
The present embodiment provides a female respiration detection device, which is different from embodiment 1 in that:
step (4), preparation of the wearable breath detection device: as shown in fig. 2, a terylene sewing yarn is adopted, the respiration sensor 1 is sewn at the chest position of the commercially available women sports underwear by adopting a flat needle method, and the circuit board is placed in the accommodating space formed by the clamping piece and the sports underwear by adopting a hot pressing method through the clamping piece at the middle position of the tight belt, so that the wearable respiration detection device can be obtained.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (8)
1. A wearable breath detection device, comprising:
a close-fitting garment body;
the breathing sensor is fixed at the part of the garment body corresponding to the chest cavity of a human body and comprises a strain sensor and electrode materials fixed at the two ends of the strain sensor; the strain sensor comprises a conductive inner core and an elastic packaging layer for packaging the conductive inner core;
the signal processor is fixed on the garment body, comprises a signal acquisition module, a signal processing module, a wireless signal transmission module, a power supply module and a signal display module which are sequentially connected, and is used for converting the signals output by the respiration sensor into visual data; the signal acquisition module is connected with the respiration sensor;
wherein the strain sensor is prepared according to the following steps:
s1, preparing cotton yarns; the cotton yarn is formed by twisting a plurality of hydrophilic single-stranded cotton yarns obtained after plasma treatment for 20-40 min;
s2, soaking the cotton yarn in the graphene oxide solution for 20-40 min, drying, and repeating the soaking and drying steps for 2-5 times to obtain a prefabricated inner core;
s3, carbonizing the prefabricated inner core to obtain the conductive inner core;
s4, fixing the electrode materials at two ends of the conductive inner core by using conductive adhesive, and then coating PDMS on the surface of the conductive inner core to form the elastic packaging layer to obtain a prefabricated sensor;
and S5, stretching the prefabricated sensor at a speed of 0.1-2 mm/S, wherein the stretching length is 3-8 mm, and obtaining the strain sensor.
2. The wearable breath detection device of claim 1, wherein the strain sensor is in the shape of a yarn, the strain sensor having a diameter of 0.1mm to 10mm and a length of 0.1cm to 20 cm.
3. The wearable respiration detection device of claim 2, wherein the respiration sensors are arranged along the circumference of the human body and are fixed on the part of the garment body corresponding to the chest cavity of the human body.
4. Wearable respiration detection apparatus according to claim 1, wherein in step S3, the carbonization process step is: heating to 650-950 ℃ at a rate of 1-10 ℃/min for 25-45 min.
5. A wearable breath detection device according to claim 1, wherein the electrode material is a metallic conductive wire or electrode yarn; the electrode yarn is made by coating a metal coating on the surface of the support yarn.
6. The wearable breath detection device of claim 1, further comprising a clamp comprising a clip and a layer of adhesive disposed around a periphery of the clip, the layer of adhesive bonded to the garment body to secure the signal processor between the clip and the garment body.
7. The wearable breath detection device of claim 1, wherein the close-fitting garment body is a vest, a close-fitting men's sports garment, a women's bra, or a women's close-fitting sports garment.
8. A respiration measurement method, wherein the respiration measurement is performed using the wearable respiration detection device according to any one of claims 1 to 7, and comprising the steps of:
s1, acquiring a real-time voltage value of the respiration sensor, processing to obtain a real-time resistance value, and comparing the real-time resistance value with a preset reference resistance value to obtain a real-time resistance change rate;
s2, according to the resistance change rate and the respiration time, taking the respiration time as a horizontal axis and taking the resistance change rate as a vertical axis, obtaining a respiration curve of the respiration sensor, wherein the respiration curve is provided with a plurality of resistance change rate wave peak values and wave trough values, two adjacent wave trough values represent single respiration, and a time interval T between two adjacent wave trough values is the single respiration time;
and S3, acquiring the respiratory frequency f according to the respiratory curve, wherein the respiratory frequency is 1/T.
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| CN107951473A (en) * | 2017-11-30 | 2018-04-24 | 中国科学院重庆绿色智能技术研究院 | Human Physiology information data vest and production method based on graphene flexible sensor |
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| CN105640522A (en) * | 2016-03-29 | 2016-06-08 | 苏州大学 | Wearable intelligent garment capable of monitoring physiological sign parameters of human body in real time |
| CN107720685B (en) * | 2017-06-15 | 2020-03-10 | 苏州大学 | Carbon/graphene flexible strain sensor and preparation method thereof |
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| CN106894133A (en) * | 2017-03-03 | 2017-06-27 | 东华大学 | A kind of stretchable multi-dimensional force sensing yarn of resistance-type |
| CN107951473A (en) * | 2017-11-30 | 2018-04-24 | 中国科学院重庆绿色智能技术研究院 | Human Physiology information data vest and production method based on graphene flexible sensor |
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