A sensor system based on friction nanogenerator and its control method

Abstract

The embodiment of the present invention provides a sensor system based on a friction nanogenerator and a control method thereof. The sensor system includes: a coil spring sensor device and a data processing circuit; the coil spring sensor device is used to convert mechanical energy into electrical energy and provide a measurement signal for the data processing circuit; the data processing circuit is used to collect the alternating current signal output by the coil spring sensor device in real time, and analyze the alternating current signal to obtain mechanical motion information; the mechanical motion information is sent to an external device, and the mechanical energy collected in the coil spring sensor can be converted into electrical energy to power the data processing circuit. At the same time, the coil spring sensor is modified so that it can respond to external mechanical motion while supplying power, thereby realizing a special correspondence between the alternating current signal and the mechanical motion, and can provide sensing functions for daily wearable devices while utilizing the mechanical energy provided by the wearing behavior itself for power supply.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of sensor technology, and specifically to a sensor system based on a friction nanogenerator and a control method thereof. Background Art

[0002] In recent years, with the rapid development of electronic devices, miniaturization, intelligence, wearability and multi-function have become the development trend of future electronic devices. More and more wearable products, smart medical and monitoring sensor devices are entering the market. They are quietly changing people's production and lifestyles, and at the same time they have created considerable market value and continuously promoted the development and progress of society. At present, many small electronic sensor devices on the market have many defects in terms of battery life, accuracy, convenience, wearability, etc. In the future, people will devote more energy to the research of multifunctional integration of sensor devices and their systems.

[0003] Moreover, mechanical energy is widely used in daily life and exists in various forms. Although mechanical energy is everywhere, it is often ignored by people because there is no effective means to collect and utilize it, resulting in energy waste. If we can efficiently collect and utilize various forms of mechanical energy that are widely used in people's production and life to solve the widespread energy shortage problem in the world, it will inevitably greatly improve people's living environment, and at the same time promote mankind to move towards a green, clean, environmentally friendly and sustainable development path, benefiting all mankind.

[0004] Therefore, how to provide a sensor system that can provide sensing functions for daily wearable devices while utilizing the mechanical energy provided by the wearing behavior itself for power supply is a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0005] To this end, an embodiment of the present invention provides a sensing system based on a friction nanogenerator and a control method thereof, which can provide sensing functions for daily wearable devices while utilizing the mechanical energy provided by the wearing behavior itself for power supply.

[0006] In order to achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides a sensing system based on a triboelectric nanogenerator, comprising:

[0008] Coil spring sensor device, data processing circuit;

[0009] The coil spring sensor device is used to convert mechanical energy into electrical energy to provide a measurement signal for the data processing circuit;

[0010] The data processing circuit is used to collect the AC signal output by the coil spring sensor in real time, analyze the AC signal to obtain mechanical motion information, and send the mechanical motion information to an external device.

[0011] Preferably, the coil spring sensor device comprises: a coil spring housing assembly, a rotating disk assembly;

[0012] The coil spring housing assembly includes a support shaft seat, a coil spring wall and a cover;

[0013] The rotating disk assembly comprises: a rope member, a rotating disk, and an energy storage and rebound part; the first end of the rope member is fixed to the upper part of the rotating disk, and the second end of the rope member is used to connect the object to be measured; the rotating disk is connected to the energy storage and rebound part;

[0014] When the second end of the rope member is pulled, the rotating disk rotates and rubs against the coil spring wall to form an AC signal; the energy storage and resilience component stores energy; when the second end of the rope member is relaxed, the energy storage and resilience component releases energy to push the rotating disk to rotate back to its original position.

[0015] Preferably, the data processing circuit comprises:

[0016] A signal amplification and filtering circuit, used for amplifying and filtering the AC signal output by the coil spring sensor;

[0017] Multi-channel synchronous data acquisition module, used to collect amplified and filtered AC signals;

[0018] A microprocessor module, used for analyzing the AC signal to obtain the tensile displacement, direction and linear speed of the rope member;

[0019] The communication transmission module is used to remotely transmit the stretching displacement, direction, and linear speed in real time.

[0020] Preferably, the outer side of the rotating disk and the inner side of the coil spring wall are both attached with corresponding grating friction surfaces with fine groove structures of different shapes;

[0021] The energy storage and resilience components include different types of springs.

[0022] Preferably, the rotating disk comprises: a first substrate layer and a free electrode layer which are sequentially attached to each other;

[0023] The coil spring wall comprises: a second substrate layer, a sensing electrode layer, and a friction layer which are sequentially attached to each other;

[0024] The rotating disk rotates synchronously with the extension and tension of the rope member, and the coil spring wall is fixedly arranged.

[0025] Preferably, the free electrode layer comprises: a strip-shaped conductive grid array having a fine channel structure, each group of strip-shaped conductive grid arrays is concentrically attached to the outer side of the rotating disk with equal arc and height;

[0026] The sensing electrode layer comprises: a separated array of interdigital sensing electrodes having a fine channel structure and a preset design shape; each group of interdigital sensing electrodes of a special shape is concentrically attached to the inner side of the coil spring wall with equal arcs and heights;

[0027] A friction layer is fixedly disposed on the upper surface of the sensing electrode layer. The friction layer is in physical contact with the free electrode layer and can generate friction charges with opposite electrical properties through friction.

[0028] Preferably, each group of preset-shaped interdigitated sensing electrode arrays in the sensing electrode layer corresponds one-to-one to each group of strip-shaped conductive grid arrays;

[0029] When the free electrode layer and the friction layer rotate relative to each other, the interdigitated sensing electrodes will induce a constantly changing induced charge; two interdigitated sensing electrodes of a preset shape are led out through wires, and the alternating current signal is processed and analyzed through a data processing circuit.

[0030] Preferably, the data processing circuit is used to determine the stretching direction of the rope member in the coil spring sensor device based on the difference of the output AC signal within a time period; after collecting the amplified and filtered AC signal, the stretching displacement of the rope member can be calculated by counting the peaks and troughs of the output waveform; the linear velocity can be obtained by dividing the calculated total displacement of the rope member by the time span required for the voltage signal to change.

[0031] Preferably, the AC signal includes peaks, troughs and a signal waveform diagram at output.

[0032] In a second aspect, an embodiment of the present invention provides a control method for a sensor system based on a friction nanogenerator, which is applied to a sensor system based on a friction nanogenerator as described in any one of the first aspects above, comprising:

[0033] Collecting the alternating current signal output by the coil spring sensor in real time;

[0034] Analyzing the AC signal to obtain mechanical motion information;

[0035] The mechanical motion information is sent to an external device.

[0036] The embodiment of the present invention provides a sensor system based on a friction nanogenerator, including: a coil spring sensor device and a data processing circuit; the coil spring sensor device is used to convert mechanical energy into electrical energy and provide a measurement signal for the data processing circuit; the data processing circuit is used to collect the AC signal output by the coil spring sensor device in real time, and analyze the AC signal to obtain mechanical motion information; and send the mechanical motion information to an external device. The sensor system provided by the embodiment of the present invention can use the mechanical energy collected in the coil spring sensor to convert it into electrical energy to power the data processing circuit, and at the same time, the coil spring sensor is modified so that it can respond to external mechanical motion while supplying power, thereby realizing a special correspondence between AC signals and mechanical motion, and can provide sensing functions for daily wearable devices while using the mechanical energy provided by the wearing behavior itself for power supply.

[0037] The embodiments of the present invention provide a sensing system based on a friction nanogenerator and a control method thereof, which have the same beneficial effects as mentioned above and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0039] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0040] Figure 1 A schematic diagram of the structure of a sensor system based on a friction nanogenerator provided in an embodiment of the present invention;

[0041] Figure 2 A schematic diagram of the structure of a coil spring sensor device in a sensing system based on a friction nanogenerator provided by an embodiment of the present invention;

[0042] Figure 3 A schematic diagram of the contact layer structure of a rotor and a stator in a sensing system based on a friction nanogenerator provided in an embodiment of the present invention;

[0043] Figure 4A schematic diagram of the working principle of the contact layer between the rotor and the stator in a short-circuit state in a sensing system based on a friction nanogenerator provided by an embodiment of the present invention;

[0044] Figure 5 Schematic diagram of stator (a) and rotor (b) conductive electrodes in a sensing system based on a triboelectric nanogenerator provided in an embodiment of the present invention;

[0045] Figure 6 A flow chart of a method for controlling a sensor system based on a friction nanogenerator provided in an embodiment of the present invention.

[0046] The accompanying drawings are marked as follows: coil spring sensor device 100, support shaft seat 110, coil spring wall 130 (stator 130), cover 150, rotating disk 120 (rotor 120), rope member 123, energy storage rebound component 124, first through hole 151, second through hole 111, first base layer 121, free electrode layer 122, second base layer 131, sensing electrode layer 132, friction layer 133, free end electrode 1221, sensing end electrode 1321, sensing end electrode 1321, signal amplification and filtering circuit 200, multi-channel synchronous data processing circuit 300, microprocessor module 400, communication module 500, mobile terminal 600. DETAILED DESCRIPTION

[0047] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 1 A schematic diagram of the structure of a sensor system based on a friction nanogenerator provided in an embodiment of the present invention; Figure 2 A schematic diagram of the structure of a coil spring sensor device in a sensing system based on a friction nanogenerator provided by an embodiment of the present invention; Figure 3 A schematic diagram of the contact layer structure of a rotor and a stator in a sensing system based on a friction nanogenerator provided in an embodiment of the present invention; Figure 4 A schematic diagram of the working principle of the contact layer between the rotor and the stator in a short-circuit state in a sensing system based on a friction nanogenerator provided by an embodiment of the present invention; Figure 5Schematic diagram of stator (a) and rotor (b) conductive electrodes in a sensing system based on a friction nanogenerator provided in an embodiment of the present invention.

[0049] In a specific embodiment of the present invention, the present invention provides a sensor system based on a friction nanogenerator, including: a coil spring sensor device 100, a data processing circuit; the coil spring sensor device 100 is used to convert mechanical energy into electrical energy and provide a measurement signal for the data processing circuit; the data processing circuit is used to collect the AC signal output by the coil spring sensor device in real time, and analyze the AC signal to obtain mechanical motion information; the mechanical motion information is sent to an external device. For example, the external device can be set to a mobile terminal 600, of course, it can also be other receiving and display devices.

[0050] Specifically, the coil spring sensor device 100 includes: a coil spring housing assembly, a rotating disk assembly; the coil spring housing assembly includes a support shaft seat, a coil spring wall and a cover; the rotating disk assembly includes: a rope member, a rotating disk, and an energy storage and rebound part; the first end of the rope member is fixed to the upper part of the rotating disk, and the second end of the rope member is used to connect the object to be measured; the rotating disk is connected to the energy storage and rebound part; when the second end of the rope member is pulled, the rotating disk rotates and rubs against the coil spring wall to form an AC signal; the energy storage and rebound part stores energy; when the second end of the rope member is relaxed, the energy storage and rebound part releases energy to push the rotating disk to rotate back to its original position.

[0051] Specifically, the coil spring housing assembly includes a support shaft seat 110, a coil spring wall (referred to as a stator unless otherwise specified) 130 and a cover 150; a rotating disk (referred to as a rotor unless otherwise specified) 120 includes a rope member 123 and an energy storage rebound member 124 tied to and wound around the upper part of the rotating disk 120, wherein the second through hole 151 on the cover 150 and the first through hole 111 on the support shaft seat are used to lead out the electrode wire.

[0052] Preferably, the data processing circuit includes: a signal amplification and filtering circuit 200, used to amplify and filter the AC signal output by the coil spring sensor; a multi-channel synchronous data acquisition module 300, used to collect the amplified and filtered AC signal; a microprocessor module 400, used to obtain the tensile displacement, direction, and linear speed of the rope member according to the analysis of the AC signal; a communication transmission module 500, used to remotely transmit the tensile displacement, direction, and linear speed in real time.

[0053] Preferably, the outer side of the rotating disk 120 and the inner side of the coil spring wall 130 are both attached with corresponding grating friction surfaces with fine groove structures of different shapes; the energy storage and rebound components include different types of spring springs. The rotating disk 120 includes: a first base layer and a free electrode layer that are sequentially attached; the coil spring wall 130 includes: a second base layer, an induction electrode layer, and a friction layer that are sequentially attached; the rotating disk rotates synchronously with the extension and tension of the rope member, and the coil spring wall is fixedly arranged.

[0054] Preferably, the free electrode layer 122 comprises: a strip-shaped conductive grid array with a fine channel structure, each group of strip-shaped conductive grid arrays is concentrically attached to the outer side of the rotating disk with equal arcs and equal heights; the sensing electrode layer 132 comprises: a separated array of interdigital sensing electrodes with a fine channel structure and a preset design shape; each group of interdigital sensing electrodes of special shape is concentrically attached to the inner side of the coil spring wall with equal arcs and equal heights; a friction layer is fixedly arranged on the upper surface of the sensing electrode layer, and the friction layer is in physical contact with the free electrode layer and can generate friction charges with opposite electrical properties through friction.

[0055] Preferably, each group of preset-shaped interdigitated sensing electrode arrays in the sensing electrode layer 132 corresponds one-to-one to each group of strip-shaped conductive grid arrays; when the free electrode layer 122 and the friction layer rotate relative to each other, continuously changing induced charges will be induced on the interdigitated sensing electrodes; two preset-shaped interdigitated sensing electrodes are led out through wires, and the alternating current signal is processed and analyzed through a data processing circuit.

[0056] Furthermore, if Figure 3 The figure shows a schematic diagram of the contact layer structure of the rotor and the stator in a sensing system based on a friction nanogenerator. The rotor 120 includes: a first substrate layer 121 and a free electrode layer 122 which are bonded to each other in sequence. The stator 130 includes: a second substrate layer 131, a sensing electrode layer 132, and a friction layer 133 which are bonded to each other in sequence. The first substrate layer 121 and the second substrate layer 131 can be polymers, such as polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), etc. In this example 1, the substrate layer uses PMMA material.

[0057] Furthermore, in this embodiment, the thickness of the friction layer Kapton (polyimide) film is preferably 35 μm, and the friction layer surface of the polyimide film layer is etched to form a nanorod morphology. The friction charge generated by the friction process between the Kapton (polyimide) film and the conductive electrode metal copper and the change in the spatial position of the electrostatic induced charge realize direct sensing of the rotational motion. Of course, the conductive electrode material can be any one of the conductive materials formed by metals, metal alloys, metal oxides (such as indium oxide), etc. The friction layer material can be a material with strong electron-acquiring ability such as: KAPTON, FEP, PFA, PTFE. The use of Kapton material in the friction layer of this example is only an example. When the surfaces of two rotating layers in contact with each other carry equal and opposite friction charges due to their different electron-acquiring abilities during the friction process, when one layer rotates relative to the other layer, the spatial position of the friction charge will also change accordingly, thereby causing the number of induced charges on the positive and negative electrodes induced by the friction charge to change, and finally generating an alternating electrical signal.

[0058] Furthermore, if Figure 4 The figure shows a schematic diagram of the working principle of the stator and rotor contact layers in a short-circuit state in a sensing system based on a friction nanogenerator. During the rotational friction process, the free-end electrode 1221 carries a positive charge and the friction layer 133 carries a negative charge. As the position of the free-end electrode 1221 changes, the induced charge generated by the two induction-end electrodes 1321 below the friction layer 133 also changes, and the potential difference between the two adjacent induction-end electrodes 1321 presents an alternating electrical signal. The appearance of these alternating electrical signal characteristic points (peaks, troughs) and output waveforms is only related to the spatial position of the free-end electrode 1221 with friction charges on the surface. Therefore, by collecting these characteristic points and the output signal waveform within a cycle and performing calculation and analysis, the tensile displacement, direction, and tensile linear velocity of the rope member in the coil spring can be directly sensed.

[0059] Preferably, the data processing circuit is used to determine the stretching direction of the rope member in the coil spring sensor device according to the difference of the output AC signal within a time period; after collecting the amplified and filtered AC signal, the stretching displacement of the rope member can be calculated by counting the peaks and troughs of the output waveform; the linear speed can be obtained by dividing the calculated total displacement of the rope member by the time span required for the voltage signal to change. The AC signal characteristics include peaks, troughs and the output signal waveform.

[0060] Furthermore, since the arc length spacing L between two adjacent sensing end electrodes 1321 on the sensing electrode layer 132 is a certain given value, by counting the peaks (or troughs) of the output waveform, the total number n of the calculated peaks (or troughs) is subtracted by 1, and then (n-1) is multiplied by the arc length spacing L between two adjacent sensing electrodes to obtain the stretching displacement of the rope member. Furthermore, the linear velocity of the rope member stretching can be obtained by dividing the calculated total displacement of the rope member stretching by the time span required for the voltage signal to change. Furthermore, the free electrode layer 122 attached to the outer wall of the rotor 120 is composed of a strip-shaped conductive grid array with a fine channel structure, and each group of strip-shaped conductive grids are concentrically distributed on the same circumference with equal arcs and heights. The sensing electrode 132 attached to the inner side of the stator 130 is composed of a separate interdigital sensing electrode array with fine grooves and a specially designed shape. Each group of interdigital sensing electrodes of a specially designed shape is concentrically distributed with equal arcs and heights on the same circumference line with the same center as the rotor electrode array but with different radii. The upper and lower conductive electrodes of the interdigital sensing electrode array with a specially designed shape are separated and not connected.

[0061] Furthermore, the interdigital sensing electrode array with a specially designed shape on the stator 130 can be in many shapes such as an equilateral triangle shape or a semi-ellipse shape. The conductive electrode array with a special type of shape is designed to identify the stretching direction of the rope member 123 in the coil spring sensor structure (that is, the rotation direction of the rotor relative to the stator) according to the output AC signal waveform. Furthermore, each group of interdigital sensing electrode arrays with a special shape in the sensing electrode layer on the stator 130 corresponds to each group of long strip-shaped conductive grid arrays, that is, each strip-shaped free electrode corresponds to two adjacent interdigital sensing electrodes with a special shape.

[0062] Furthermore, the number of free-end electrodes 1221 and the number of sensing-end electrodes 1321 on the rotor 120 and the stator 130 respectively directly affect the measurement accuracy of the sensing system. At the same time, the number of free-end electrodes 1221 and the number of sensing-end electrodes 1321 as well as the spacing between two adjacent conductive electrodes can be manually set according to the measurement accuracy requirements. In this embodiment 1, the number of free-end electrodes 1221 is 30, and the number of sensing-end electrodes 1321 is 60.

[0063] Furthermore, when the rope member 123 is subjected to external tensile force, the energy storage rebound component 124 (a spiral inner hook and outer clamp spring is used in this example) will produce elastic deformation, which can cause the stator 130 to slip relative to the rotor 120, thereby causing a friction electrification effect. At the same time, because the design shape of the conductive electrode in the free electrode layer 122 on the rotor 120 is different from the design shape of the electrode in the induction electrode layer on the stator 130, when the rotor 120 rotates clockwise or counterclockwise relative to the stator 130, the waveform of the generated alternating current signal within one cycle is symmetrically distributed about the time axis. According to the set program, the signal can pass through the phase detection circuit in the microprocessor module 400 to complete the judgment of the relative rotation direction of the rotor 120 (that is, the tensile direction of the rope member in the coil spring).

[0064] Furthermore, the interdigital sensing electrodes that are not connected to each other are led out through wires and amplified by the signal amplification and filtering circuit 200, and then the data is collected by the multi-channel synchronous data processing circuit 300 and sent to the microprocessor module 400 for processing and analysis.

[0065] Furthermore, the information such as the rope stretching displacement, direction and stretching linear velocity can be written into the storage unit of the microprocessor in real time, so unless the reset key is pressed during the interval between two rotations, the initial state of the next rotation will still be the initial state before the reset.

[0066] Furthermore, the system also includes a communication module 500 for remotely transmitting the obtained information such as the stretching displacement, direction and stretching linear speed. The communication module 500 uses a low-power Bluetooth module (version 4.0 or above protocol). Figure 1 As shown, the Bluetooth module 500, of course, other communication modules may also be used, such as a WiFi module or other wired or wireless communication module.

[0067] An embodiment of the present invention provides a sensing system based on a friction nanogenerator, which can utilize the mechanical energy collected in a coil spring sensor to convert into electrical energy to power a data processing circuit. At the same time, the coil spring sensor is modified so that it can respond to external mechanical movement while supplying power, thereby achieving a special correspondence between AC signals and mechanical movement. It can provide sensing functions for daily wearable devices while utilizing the mechanical energy provided by the wearing behavior itself for power supply.

[0068] Please refer to Figure 6 , Figure 6 A flow chart of a method for controlling a sensor system based on a friction nanogenerator provided in an embodiment of the present invention.

[0069] An embodiment of the present invention provides a control method for a sensor system based on a friction nanogenerator, which is applied to a sensor system based on a friction nanogenerator as described in any embodiment of the first aspect above, comprising:

[0070] Step S11: collecting the AC signal output by the coil spring sensor in real time;

[0071] Step S12: Analyze the AC signal to obtain mechanical motion information;

[0072] Step S13: sending the mechanical motion information to an external device.

[0073] Specifically, corresponding to the above embodiment, this embodiment proposes a control method of a sensor system based on a friction nanogenerator.

[0074] like Figure 6 The flowchart of a control method of a sensor system based on a friction nanogenerator is shown, and the process includes: the rope member 123 tied to the rotor 120 is subjected to an external force, which causes the spring spring 124 in the coil spring sensor to produce elastic deformation and drive the rotor 120 to rotate relative to the stator 130, thereby generating an AC signal. The generated AC signal is amplified and filtered, and then the processed signal is collected and sent to the microprocessor module 400 for calculation and processing. The displacement, direction and linear velocity of the rope member are obtained by calculating and analyzing the characteristic points of the signal (including the peaks or troughs) and the waveform diagram in a single cycle.

[0075] This embodiment provides a method for controlling a sensor system based on a friction nanogenerator. The specific contents of each step have been described in detail in the above embodiments and will not be repeated here.

[0076] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, these modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A sensing system based on a friction nanogenerator, characterized in that: include: Coil spring sensor device, data processing circuit; The coil spring sensor device is used to convert mechanical energy into electrical energy to provide a measurement signal for the data processing circuit; The data processing circuit is used to collect the AC signal output by the coil spring sensor in real time and analyze the AC signal to obtain mechanical motion information; sending the mechanical motion information to an external device; The coil spring sensor device comprises: a coil spring housing component, a rotating disk component; the coil spring housing component comprises a support shaft seat, a coil spring wall and a cover; the rotating disk component comprises: a rope member, a rotating disk, and an energy storage and resilience component; the first end of the rope member is fixed to the upper part of the rotating disk, and the second end of the rope member is used to connect the object to be measured; the rotating disk is connected to the energy storage and resilience component; when the second end of the rope member is pulled, the rotating disk rotates and rubs against the coil spring wall to form an AC signal; the energy storage and resilience component stores energy; when the second end of the rope member is relaxed, the energy storage and resilience component releases energy to push the rotating disk to rotate back to its original position; The data processing circuit includes: a signal amplification and filtering circuit, which is used to amplify and filter the AC signal output by the coil spring sensor; a multi-channel synchronous data acquisition module, which is used to collect the amplified and filtered AC signal; a microprocessor module, which is used to analyze the AC signal to obtain the tensile displacement, direction, and linear speed of the rope member; and a communication transmission module, which is used to remotely transmit the tensile displacement, direction, and linear speed in real time. The outer side of the rotating disk and the inner side of the coil spring wall are both attached with corresponding grating friction surfaces with fine groove structures of different shapes; the energy storage and rebound components include different types of spring springs; The rotating disk comprises: a first substrate layer and a free electrode layer which are sequentially attached; The coil spring wall comprises: a second substrate layer, a sensing electrode layer, and a friction layer which are sequentially attached to each other; The rotating disk rotates synchronously with the extension and tension of the rope member, and the coil spring wall is fixedly arranged.

2. The sensor system according to claim 1, characterized in that: The free electrode layer comprises: a strip-shaped conductive grid array having a fine channel structure, each group of strip-shaped conductive grid arrays being concentrically attached to the outer side of the rotating disk with equal arcs and heights; The sensing electrode layer comprises: a separated array of interdigital sensing electrodes having a fine channel structure and a preset design shape; each group of interdigital sensing electrodes of a special shape is concentrically attached to the inner side of the coil spring wall with equal arcs and heights; A friction layer is fixedly disposed on the upper surface of the sensing electrode layer. The friction layer is in physical contact with the free electrode layer and can generate friction charges with opposite electrical properties through friction.

3. The sensor system according to claim 2, characterized in that: Each group of preset-shaped interdigitated sensing electrode arrays in the sensing electrode layer corresponds one-to-one to each group of strip-shaped conductive grid arrays; When the free electrode layer and the friction layer rotate relative to each other, the interdigital sensing electrodes will induce a continuously changing induced charge; two interdigital sensing electrodes of a preset shape are led out through wires, and the alternating current signal is processed and analyzed through a data processing circuit.

4. The sensor system according to claim 3, characterized in that: The data processing circuit is used to determine the stretching direction of the rope member in the coil spring sensor device according to the difference of the output AC signal within a time period; after collecting the amplified and filtered AC signal, the stretching displacement of the rope member is calculated by counting the peaks and troughs of the output waveform; the linear velocity can be obtained by dividing the calculated total displacement of the rope member by the time span required for the voltage signal to change.

5. The sensor system according to any one of claims 1 to 4, characterized in that: The AC signal includes a peak, a trough, and an output signal waveform diagram.

6. A control method for a sensor system based on a friction nanogenerator, applied to the sensor system based on a friction nanogenerator as claimed in any one of claims 1 to 4, characterized in that: include: Collecting the alternating current signal output by the coil spring sensor in real time; Analyzing the AC signal to obtain mechanical motion information; The mechanical motion information is sent to an external device.

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