Self-driven respiration sensor based on composite sensor

Abstract

The invention discloses a self-driven respiration sensor based on a composite sensor, and relates to the technical field of respiration sensors, the self-driven respiration sensor comprises a body, two ends of the body are provided with communicated air vents, and an air flow channel for air circulation is formed between the two air vents in the body; the body comprises a friction nano-generator sensor and a piezoelectric nano-generator sensor and is used for collecting vibration frequency, duration time and breathing frequency information of airflow; by compounding the two sensors, airflow information collected by the sensors can be enriched, electric signals of different breathing intensities and breathing modes can be fully collected, subsequent signal analysis is facilitated, the accuracy of the sensors is improved, and meanwhile, by combining an existing advanced self-driven sensing technology, the low power consumption and the high reliability of the airflow sensor are achieved. The device can be used without an external power supply.

Description

Technical Field

[0001] The present application relates to the technical field of respiratory sensors, and in particular to a self-driven respiratory sensor based on a composite sensor. Background Art

[0002] At present, sensors that monitor human breathing are divided into two types: direct monitoring (collecting airflow information through the mouth and nose) and indirect monitoring (by monitoring changes in the chest and abdominal cavity contours). In existing direct monitoring breathing sensors, a turbofan structure is generally used to convert the airflow generated by breathing into a readable electrical signal. This type of sensor relies on the rotation of the fan blades to collect airflow information from breathing. When the wind speed and wind direction suddenly change, due to the rotational inertia of the fan blades, there will be a delay in the sensing time, making the data inaccurate. At the same time, existing respiratory sensors are usually active devices that require an external power supply to work properly, which limits the service life and scope of use of the sensor and increases the overall size and power consumption of the sensor. Summary of the invention

[0003] In order to solve the above problems, the present application provides a self-driven breathing sensor based on a composite sensor. The two sensors enrich the airflow information collected by the sensor, which is beneficial to subsequent signal analysis, improves the accuracy of the sensor, and can be used without an external power supply. The technical solution is as follows:

[0004] The present application provides a self-driven breathing sensor based on a composite sensor, comprising a main body, with interconnected vents at both ends of the main body, and an air flow channel for gas circulation formed between the two vents inside the main body; the main body comprises a friction nanogenerator sensor and a piezoelectric nanogenerator sensor, which are used to collect the vibration frequency, duration and breathing frequency information of the airflow.

[0005] For example, in the self-driven breathing sensor based on the composite sensor provided in one embodiment, the main body includes a first friction layer, a second friction layer and a packaging structure, the first friction layer includes two independent substrates, the two substrates are located in the same plane and there is a gap between them, so that the airflows in opposite directions generated during inhalation and exhalation drive different substrates to deform and swing; the second friction layer is attached to the surface of the first friction layer; the packaging structure includes a first packaging layer and a second packaging layer, the first packaging layer is located on the surface of the second friction layer away from the first friction layer, and the second packaging layer is located on the surface of the first friction layer away from the second friction layer.

[0006] For example, in the self-driven breathing sensor based on the composite sensor provided in one embodiment, one of the substrates and the second friction layer constitutes a friction nanogenerator sensor, and the other substrate constitutes a piezoelectric nanogenerator sensor.

[0007] For example, in the self-driven breathing sensor based on the composite sensor provided in one embodiment, the two substrates have the same size and are arranged flat and spaced apart along the gas flow direction to form the first friction layer.

[0008] For example, in the self-driven breathing sensor based on the composite sensor provided in one embodiment, the first friction layer is a flexible polyvinylidene fluoride layer, and the two substrates are flexible polyvinylidene fluoride substrates.

[0009] For example, in the self-driven breathing sensor based on the composite sensor provided in one embodiment, the second friction layer is a polytetrafluoroethylene film.

[0010] For example, in the self-driven breathing sensor based on the composite sensor provided in one embodiment, the first packaging layer and the second packaging layer are polyethylene terephthalate cover plates.

[0011] For example, in the self-driven breathing sensor based on the composite sensor provided in one embodiment, the body also includes a supporting structure, the supporting structure includes a first supporting layer and a second supporting layer, the first supporting layer is located between the second friction layer and the first packaging layer, and the second supporting layer is located between the first friction layer and the second packaging layer.

[0012] For example, in the self-driven breathing sensor based on the composite sensor provided in one embodiment, the first supporting layer and the second supporting layer are polylactic acid frames.

[0013] For example, in the self-driven breathing sensor based on the composite sensor provided in one embodiment, corresponding vents are provided at both ends of the polylactic acid frame, and the space enclosed by the polylactic acid frame is the airflow channel.

[0014] The beneficial effects brought about by a self-driven breathing sensor based on a composite sensor provided in some embodiments of the present application are as follows: the present application combines two sensors, namely a friction nanogenerator sensor and a piezoelectric nanogenerator sensor, which can enrich the airflow information collected by the sensor and can fully collect electrical signals of different breathing intensities and breathing methods, which is beneficial to subsequent signal analysis and improves the accuracy of the sensor. It has the advantages of low power consumption, high sensitivity, high stability and low cost in collecting airflow information. At the same time, combined with the existing advanced self-driven sensing technology, the airflow sensor can achieve low power consumption and can be used without an external power supply. It has the advantages of simple structure, compact size, stable performance and accurate sensing. It can be integrated into wearable electronic devices and therefore has broad application potential in the field of sensing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic diagram of the overall structure of the self-driven breathing sensor based on the composite sensor of the present application;

[0017] Figure 2 This is an exploded diagram of the self-driven breathing sensor based on the composite sensor of the present application. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] The present application provides a self-driven breathing sensor based on a composite sensor, such as Figure 1-2 As shown, it includes a main body 100, at both ends of which are provided with interconnected vents A, and an air flow channel S for gas circulation is formed between the two vents inside the main body 100; the main body includes a friction nanogenerator sensor and a piezoelectric nanogenerator sensor, which are used to collect the vibration frequency, duration and breathing frequency information of the airflow.

[0021] The self-driven respiratory sensor based on the composite sensor of the present application is a composite sensor that collects respiratory airflow information through two sensors. At the same time, it combines the existing advanced self-driven sensing technology to achieve low power consumption of the airflow sensor.

[0022] The present application combines two sensors, a friction nanogenerator sensor and a piezoelectric nanogenerator sensor, which can enrich the airflow information collected by the sensor. Among them, the friction nanogenerator sensor is a mechanical sensor made using the triboelectric effect and electrostatic induction. When the inner surfaces of the materials of the two friction layers come into contact, the charge is transferred, so that the inner surface of one friction layer is positively charged and the inner surface of the other friction layer is negatively charged. Subsequently, the two inner surfaces with opposite charges are separated under the action of an external force, and an electric field is generated between the two surfaces, thereby forming an electric potential difference between the electrodes, which promotes the flow of electrons in the external circuit; the piezoelectric nanogenerator sensor is another mechanical sensor that generates an internal potential in a piezoelectric material under stress. The centers of positive and negative charges of piezoelectric materials overlap when they are not subject to external forces. When subjected to external stress, the centers of positive and negative charges inside the material will be offset and form a dipole moment. The superposition of the dipole moment forms a piezoelectric potential on the surface of the material and drives the flow of electrons in the external circuit.

[0023] The self-driven breathing sensor based on the composite sensor of the present application is a signal conversion device that does not require an external power supply. It converts the collected mechanical energy signal into electrical energy or electrical signal, so it can be used without an external power supply. The power generation principle is a friction electric nanogenerator sensor and a piezoelectric nanogenerator sensor.

[0024] The self-driven breathing sensor based on the composite sensor of the present application has a smaller size and stronger environmental adaptability, and can be integrated into wearable electronic devices, so it has broad application potential in the field of sensing.

[0025] For example, in the self-driven breathing sensor based on the composite sensor provided in one embodiment, Figure 2 As shown, the body 100 includes:

[0026] The first friction layer 110 includes two independent substrates 111, the two substrates 111 are located in the same plane and there is a gap 112 between them, so that the airflows in opposite directions generated during inhalation and exhalation drive the different substrates 111 to deform and swing; specifically, the first friction layer 110 is a flexible polyvinylidene fluoride layer, the two substrates 111 are flexible polyvinylidene fluoride substrates, the two substrates 111 have exactly the same specifications and sizes, and are laid flat and spaced apart along the gas flow direction to form the first friction layer 110;

[0027] A second friction layer 120, wherein the second friction layer 120 is a polytetrafluoroethylene film, and the second friction layer 120 is coated on the surface of the first friction layer 110;

[0028] A packaging structure 130, wherein the packaging structure 130 comprises a first packaging layer 131 and a second packaging layer 132, wherein the first packaging layer 131 is located on a surface of the second friction layer 120 away from the first friction layer 110, and the second packaging layer 132 is located on a surface of the first friction layer 110 away from the second friction layer 120;

[0029] The support structure 140 includes a first support layer 141 and a second support layer 142 . The first support layer 141 is located between the second friction layer 120 and the first encapsulation layer 131 , and the second support layer 142 is located between the first friction layer 110 and the second encapsulation layer 132 .

[0030] One of the substrates 111 and the second friction layer 120 constitutes a friction nanogenerator sensor, and the other substrate 111 constitutes a piezoelectric nanogenerator sensor.

[0031] The present application combines a friction nanogenerator sensor and a piezoelectric nanogenerator sensor to respectively collect different information of airflow, and can fully collect electrical signals of different breathing intensities and breathing methods. Specifically, the friction nanogenerator sensor is more advantageous in collecting the vibration frequency information of the airflow, and the piezoelectric nanogenerator sensor is more advantageous in collecting the duration of the airflow, breathing frequency and other information. The setting of the two sensors increases the collected airflow information, is beneficial to subsequent signal analysis, improves the accuracy of the sensor, and has the advantages of low power consumption, high sensitivity, high stability and low cost in collecting airflow information.

[0032] For example, in the self-driven breathing sensor based on the composite sensor provided in an embodiment, the first packaging layer 131 and the second packaging layer 132 are polyethylene terephthalate cover plates, which are packaged as upper and lower cover plates.

[0033] For example, in the self-driven breathing sensor based on the composite sensor provided in one embodiment, Figure 2 As shown, the first supporting layer 141 and the second supporting layer 142 are polylactic acid frames, and the present application adopts the polylactic acid frames as supports.

[0034] For example, in the self-driven breathing sensor based on the composite sensor provided in one embodiment, Figure 2 As shown, corresponding vents A are provided at both ends of the polylactic acid frame, and the space enclosed by the polylactic acid frame is the airflow channel S.

[0035] When in use, the self-driven breathing sensor based on the composite sensor of the present application is placed in front of the mouth of the test subject, and one of the vents A is covered with the lips. During the test, the test subject breathes through the mouth. When the human body inhales gas, the flexible polyvinylidene fluoride substrate 111 will swing due to the breathing airflow, and the exhalation and inhalation will cause different substrates 111 to deform respectively, specifically: the last substrate 111 flowing through in the airflow direction will deform more. For example, when inhaling, the substrate 111 closer to the mouth will deform more; when exhaling, the substrate 111 farther from the mouth will deform more, and the flexible polyvinylidene fluoride substrate 111 will bend and deform to generate a piezoelectric signal, and another flexible polyvinylidene fluoride substrate 111 will rub against the polytetrafluoroethylene film, that is, the second friction layer 120, to generate a friction electric signal; when the human body inhales or exhales gas, the flexible polyvinylidene fluoride 103 will bend and deform to generate a piezoelectric signal, and another flexible polyvinylidene fluoride 103 will rub against the polytetrafluoroethylene film 102 to generate a friction electric signal. When the breathing intensity and breathing method are different, the collected signals are also different. The setting of the two sensors increases the collected airflow information and can fully collect the electrical signals of different breathing intensity and breathing methods, which is beneficial to subsequent signal analysis and improves the accuracy of the sensor.

[0036] The present application is beneficial to realizing the self-driving of the breathing sensor, and compared with the active sensor, it has the advantages of small size, simple mechanical structure and circuit structure, long service life, etc., and reduces the power consumption requirement of the whole instrument; the present application adopts a composite sensor, integrating the use of two different sensors, and enriching the collected sensor information; compared with the turbofan type breathing sensor, the present application has the advantages of low delay and no driving inertia.

[0037] Although the implementation scheme of the present application has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes, and it can be fully applicable to various fields suitable for the present application. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present application is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A self-driven breathing sensor based on a composite sensor, characterized in that: It includes a main body, with interconnected vents at both ends of the main body, and an air flow channel for gas circulation formed between the two vents inside the main body; the main body includes a friction nanogenerator sensor and a piezoelectric nanogenerator sensor, which are used to collect vibration frequency, duration and breathing frequency information of the airflow.

2. The self-driven breathing sensor based on the composite sensor according to claim 1, characterized in that: The body comprises: A first friction layer, wherein the first friction layer comprises two independent substrates, the two substrates are located in the same plane and there is a gap between them, so that the airflows in opposite directions generated during inhalation and exhalation drive the different substrates to deform and swing; A second friction layer, attached to the surface of the first friction layer; The packaging structure comprises a first packaging layer and a second packaging layer, wherein the first packaging layer is located on a surface of the second friction layer away from the first friction layer, and the second packaging layer is located on a surface of the first friction layer away from the second friction layer.

3. The self-driven breathing sensor based on the composite sensor according to claim 2, characterized in that: One of the substrates and the second friction layer constitutes a friction nanogenerator sensor, and the other substrate constitutes a piezoelectric nanogenerator sensor.

4. The self-driven breathing sensor based on the composite sensor according to claim 3, characterized in that: The two substrates have the same size and are arranged flat and spaced apart along the gas flow direction to form the first friction layer.

5. The self-driven breathing sensor based on the composite sensor according to claim 4, characterized in that: The first friction layer is a flexible polyvinylidene fluoride layer, and the two substrates are flexible polyvinylidene fluoride substrates.

6. The self-driven breathing sensor based on the composite sensor according to claim 5, characterized in that: The second friction layer is a polytetrafluoroethylene film.

7. The self-driven breathing sensor based on the composite sensor according to claim 6, characterized in that: The first encapsulation layer and the second encapsulation layer are polyethylene terephthalate cover plates.

8. The self-driven breathing sensor based on the composite sensor according to claim 7, characterized in that: The body further includes a supporting structure, wherein the supporting structure includes a first supporting layer and a second supporting layer, wherein the first supporting layer is located between the second friction layer and the first packaging layer, and the second supporting layer is located between the first friction layer and the second packaging layer.

9. The self-driven breathing sensor based on the composite sensor according to claim 8, characterized in that: The first supporting layer and the second supporting layer are polylactic acid frames.

10. The self-driven breathing sensor based on the composite sensor according to claim 9, characterized in that: Corresponding vents are provided at both ends of the polylactic acid frame, and the space enclosed by the polylactic acid frame is the airflow channel.

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