A self-powered flexible sensor monitoring system for grain growth status

Abstract

The invention belongs to the field of grain growth status monitoring, and specifically relates to a self-powered grain growth status flexible sensor monitoring system, comprising a friction nanogenerator, a flexible electronic sensor, a flexible stretching sensor, a soil NPK sensor, etc.; the flexible electronic sensor is arranged on the leaves of the grain, and is respectively used to detect the contents of nitrogen, phosphorus, potassium, magnesium, zinc, and iron in the grain leaves; the flexible stretching sensor, the friction nanogenerator, and the voltage stabilizing module are arranged on the straw; wherein the flexible stretching sensor is used to monitor the growth length of the grain stem veins; the soil NPK sensor is arranged in the soil, and is used to detect the contents of nitrogen, phosphorus, and potassium in the soil; the power lines of the flexible electronic sensor, the flexible stretching sensor, the soil NPK sensor, and the GSM communication module are connected to the voltage stabilizing module and then connected to the friction nanogenerator; the GSM communication module is hung on the leaves of the grain.

Description

Technical Field

[0001] The invention belongs to the field of grain growth state detection, and in particular relates to a self-powered grain growth state flexible sensor monitoring system. Background Art

[0002] With the continuous advancement of science and technology, flexible sensor technology has been widely used in the agricultural field. These sensors can monitor soil moisture, temperature, light intensity and plant growth status in real time without damaging the plants, providing important data support for agricultural management. Although flexible sensors have great application potential in agriculture, research on self-powered and grain detection is still in its infancy. At present, many flexible sensors still rely on external power or battery power, which not only increases the maintenance cost of the equipment, but also limits its application in remote and large-area agricultural monitoring. In addition, the specific application of existing flexible sensors in grain detection also lacks accurate and efficient detection solutions for grain element content. Summary of the invention

[0003] In order to solve the technical problems existing in the prior art, the present invention designs a self-powered grain growth status flexible sensor monitoring system.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A self-powered flexible sensor monitoring system for grain growth status, comprising a friction nanogenerator, a voltage stabilization module, a flexible electronic sensor, a flexible tensile sensor, a soil NPK sensor, and a GSM communication module;

[0006] The flexible electronic sensor is arranged on the leaves of the grains and is used to detect the contents of nitrogen, phosphorus, potassium, magnesium, zinc and iron in the leaves of the grains respectively;

[0007] The flexible stretch sensor, friction nanogenerator, and voltage stabilization module are arranged on the straw; wherein the flexible stretch sensor is used to monitor the growth length of grain stem veins;

[0008] The soil NPK sensor is arranged in the soil to detect the content of nitrogen, phosphorus and potassium in the soil;

[0009] The serial lines of the flexible electronic sensor, the flexible tensile sensor and the soil NPK sensor are connected to the GSM communication module, and the power lines of the flexible electronic sensor, the flexible tensile sensor, the soil NPK sensor and the GSM communication module are connected to the voltage stabilizing module and then to the friction nanogenerator; the GSM communication module is hung on the leaves of the grain.

[0010] As a further technical solution, the friction nanogenerator is composed of a Mo2 / PDMS film, an aluminum film, and a PET tape; the Mo2 / PDMS film includes polydimethylsiloxane and nano-metal molybdenum, polydimethylsiloxane is the base material, and nano-metal molybdenum is covered on the polydimethylsiloxane as a conductive material; the aluminum film serves as another electrode; the PET tape is divided into two layers, the upper layer is bonded to the Mo2 / PDMS film, and the lower layer is bonded to the aluminum film.

[0011] As a further technical solution, the flexible stretch sensor has a three-layer structure, with a PDMS base layer and a polyurethane protective layer on the outside; a mesh silver nanowire conductive layer and a silver electrode layer on the inside; the electrodes are connected at both ends of the conductive layer, with only the terminal ends exposed.

[0012] As a further technical solution, the flexible electronic sensor includes six detection modules, namely, a nitrogen detection module, a phosphorus detection module, a potassium detection module, a magnesium detection module, a zinc detection module, and an iron detection module; the nitrogen detection module, the phosphorus detection module, the potassium detection module, the magnesium detection module, the zinc detection module, and the iron detection module are adhered to one side of the grain leaves and straw through a carbon nanofilm as a substrate.

[0013] As a further technical solution, the nitrogen detection module comprises an ion selective electrode (ISE), a PVB electrode doped with silver chloride, and an NH 4+ Exchange resin and polyvinyl chloride membrane doped with potassium dichromate.

[0014] As a further technical solution, the phosphorus detection module includes an ion selective electrode (ISE) and a PVB electrode doped with silver chloride, and a PO4 3- Exchange resin with polyvinyl chloride membrane doped with sodium molybdate.

[0015] As a further technical solution, the potassium detection module includes an ion selective electrode (ISE) and a PVB electrode doped with silver chloride, and a K + Exchange resin with polyvinyl chloride membrane doped with lithium carbonate.

[0016] As a further technical solution, the magnesium detection module includes an ion selective electrode (ISE) and a PVB electrode doped with silver chloride, and a Mg is arranged between the ion selective electrode (ISE) and the PVB electrode doped with silver chloride. 2+ Exchange resin with polyvinyl chloride membrane doped with ethylenediaminetetraacetic acid.

[0017] As a further technical solution, the zinc detection module comprises an ion selective electrode (ISE), a PVB electrode doped with silver chloride, and a Zn 2+ Exchange resin with polyvinyl chloride membrane doped with ethylenediaminetetraacetic acid.

[0018] As a further technical solution, the iron detection module comprises an ion selective electrode (ISE) and a PVB electrode doped with silver chloride, and a Fe 2+ Exchange resin with pyridine-doped polyvinyl chloride membrane.

[0019] The above-mentioned self-powered flexible sensor monitoring method for grain growth status:

[0020] The friction nanogenerator proposed in the present invention is a friction nanogenerator attached to one side of a grain (e.g. corn) stalk. Two friction materials, Mo2 / PDMS and aluminum film, form a capacitor structure. A layer of PET tape is attached between the two materials to separate them, and the interval between the tapes can be changed. The corn stalk is shaken by wind energy, and the surfaces of the two electrodes are periodically contacted and separated. Due to friction electrification and electrostatic induction, a potential difference will be generated on the electrodes, driving electrons to flow into the circuit, providing power for each module of the system. The flexible electronic sensor proposed in the present invention uses a needle to break a small hole in the corn stalk to allow the juice to flow out, and then enter the resin and PVC film after passing through the carbon nanofilm and the PVB electrode doped with silver chloride. Each detection target ion will combine with the ion carrier and undergo an exchange reaction, thereby improving the selectivity of each subsequent ion selective electrode (ISE) for each target ion, and then the concentration is detected by a micro electrochemical sensor. The flexible stretch sensor proposed in the present invention is attached to one side of the straw through a PDMS film. After growth, the flexible stretch sensor is stretched as the covered straw range increases, and the internal silver nanowires are stretched and deformed to change the resistance, thereby changing the voltage at both ends of the electrode. Finally, the flexible sensor and the soil NPK sensor transmit the collected data to the GSM module, and finally transmit the data to the user end through the GSM module; to achieve the effect of self-powered grain monitoring.

[0021] The beneficial effects of the present invention are as follows:

[0022] The friction nanogenerator device in the present invention uses the periodic contact and separation of the friction material surface to cause friction electrification and electrostatic induction, providing current for the system, achieving the purpose of self-power supply, reducing power generation costs, reducing occupied area and more environmentally friendly power generation; and the flexible electronic sensor device uses a variety of ion carriers and ion exchangers with different affinities for the detection elements, and this device can detect multiple elements compared to a single ion detection sensor. The flexible stretching sensor in the present invention refers to the flexible pressure sensor, and the resistance of the conductive material mesh silver nanowire of the conductive layer changes when stretched, thereby realizing the detection of the growth length of grains. Compared with the common growth detection that can only use a visual system, this device is simpler in structure and has lower power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the triboelectric sensor of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the flexible electronic sensor of the present invention;

[0026] Figure 4 It is a schematic diagram of the structure of each detection module of the flexible electronic sensor of the present invention;

[0027] Figure 5 This is a schematic diagram of the flexible electronic sensor of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the flexible stretch sensor of the present invention;

[0029] Figure 7 This is a schematic diagram of the soil NPK sensor of the present invention;

[0030] Figure 8 It is the overall system principle diagram of the present invention.

[0031] In the figure: 1. Corn plant; 2. Friction nanogenerator; 3. Flexible electronic sensor; 4. Flexible stretch sensor; 5. Soil NPK sensor; 6. GSM communication module; 7. Mo2 / PDMS membrane; 8. Aluminum film; 9. PET tape; 10. Voltage stabilizing module; 11. Carbon nanofilm; 12. Detection module; 13. PVB electrode doped with silver chloride; 14. Ion carrier; 15. Ion exchanger; 16. Ion selective electrode; 17. Micro electrochemical sensor; 18. Pin; 19. Polyurethane protective layer; 20. Silver nanowire conductive layer; 21. Silver electrode layer; 22. PDMS substrate layer. DETAILED DESCRIPTION

[0032] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0034] Explanation of terms: the soil NPK sensor in this embodiment is a soil nitrogen, phosphorus and potassium sensor; Mo2 / PDMS membrane is a nanometal molybdenum / polydimethylsiloxane membrane; PVB electrode is a polyvinyl butyral electrode; ISE is an ion selective electrode; PDMS base layer is a polydimethylsiloxane film; PET tape is a polyethylene terephthalate tape.

[0035] The present invention is described in detail below with reference to the accompanying drawings, taking the growth monitoring of corn plants as an example, as follows:

[0036] like Figure 1 , Figure 8 As shown, this embodiment provides a self-powered flexible sensor monitoring system for grain growth status, including a friction nanogenerator 2, a voltage stabilizing module 10, a flexible electronic sensor 3, a flexible stretching sensor 4, a soil NPK sensor 5, and a GSM communication module 6;

[0037] The flexible electronic sensor 3 is arranged on the leaves of the corn plant 1, the flexible tensile sensor 4, the friction nanogenerator 2, and the voltage stabilizing module 10 are arranged on the straw, and the soil NPK sensor 5 is arranged in the soil; the serial lines of the flexible electronic sensor 3, the flexible tensile sensor 4 and the soil NPK sensor 5 are connected to the GSM communication module 6, and the power lines of each sensor and the GSM communication module 6 are connected to the voltage stabilizing module 10 and then connected to the friction nanogenerator 2; the GSM communication module 6 is hung on the leaves of the corn plant 1 using a connecting rope.

[0038] Specifically, the triboelectric nanogenerator 2 is composed of a Mo2 / PDMS film 7, an aluminum film 8, and a PET tape 9, and the triboelectric sensor is attached to one side of the corn stalk;

[0039] The flexible electronic sensor 3 includes a carbon nanofilm 11, an ion carrier 14, an ion exchanger 15, a PVB electrode doped with silver chloride 13, an ion selective electrode 16, and a micro electrochemical sensor;

[0040] The flexible electronic sensor 3 comprises six detection modules 12 for detecting nitrogen, phosphorus, potassium, magnesium, zinc and iron respectively;

[0041] The flexible stretch sensor 4 is a three-layer structure, with a PDMS base layer 22 and a polyurethane protective layer 19 on the outside; a mesh silver nanowire conductive layer 20 and a silver electrode layer 21 on the inside; the electrodes are connected to both ends of the conductive layer, with only the terminal ends exposed;

[0042] The pin 18 of the soil NPK sensor 5 is inserted into the soil to detect the content of nitrogen, phosphorus and potassium in the soil;

[0043] The serial port lines of the sensors are connected to the GSM communication module 6, and the power lines of the sensors and the GSM communication module 6 are connected to the voltage stabilizing module 10 and then to the friction electric sensor; the GSM communication module 6 is hung on the blade using a connecting rope.

[0044] Specifically, Figure 2 As shown, the above-mentioned friction nanogenerator 2 is composed of Mo2 / PDMS film 7, aluminum film 8, and PET tape 9; the Mo2 / PDMS film 7 includes polydimethylsiloxane (PDMS) and nano-metal molybdenum, polydimethylsiloxane (PDMS) is the base material, and nano-metal molybdenum is covered on PDMS as a conductive material; the aluminum film 8 is used as another electrode; the PET tape 9 is divided into two layers, the upper layer is bonded to the Mo2 / PDMS film 7, and the lower layer is bonded to the aluminum film 8; the two layers of PET tape 9 are not bonded in the middle, and are only fixed at the four corners. In this embodiment, each friction nanogenerator 2 structure includes five groups of Mo2 / PDMS films 7 and aluminum films 8, and copper wires are led out from one side of the Mo2 / PDMS film 7 and the aluminum film 8 to connect the voltage stabilizing module 10; the voltage stabilizing module 10 is connected to the GSM communication module 6 and each sensor to correct the power output of the friction nanogenerator 2 to ensure that the power output is maintained at 5V.

[0045] Further, such as Figure 4 , Figure 5As shown, the flexible electronic sensor 3 is adhered to one side of the corn leaf and the straw through the carbon nanofilm 11 as a substrate; the flexible electronic sensor 3 comprises six detection modules 12, which respectively detect nitrogen, phosphorus, potassium, magnesium, zinc and iron; the six detection modules 12 are all attached to the same carbon nanofilm 11; the six detection modules 12 are each attached to the carbon nanofilm 11 with a PVB electrode 13 doped with silver chloride as one end of the electrode; the six detection modules 12 are respectively attached to the carbon nanofilm 11 with an ion selective electrode 16 for detecting the content of nitrogen, phosphorus, potassium, magnesium, zinc and iron as the other side electrode; an ion carrier 14 and an ion exchanger 15 are arranged between the ion selective electrode 16 and the PVB electrode 13 doped with silver chloride; the ion selective electrode 16 and the PVB electrode 13 doped with silver chloride are connected to a micro electrochemical sensor 17 for detecting the concentration of the target element.

[0046] The other side of the carbon nanofilm 11 comprises a plurality of pins 18 , and the pins 18 are inserted into the detection position of the corn plant 1 .

[0047] The ion carrier 14 and ion exchanger 15 of each detection element are NH 4+ Exchange resin and polyvinyl chloride (PVC) membrane doped with potassium dichromate, PO4 3- Exchange resin and polyvinyl chloride (PVC) membrane doped with sodium molybdate, K + Exchange resin and polyvinyl chloride (PVC) membrane doped with lithium carbonate, Mg²⁺ exchange resin and polyvinyl chloride (PVC) membrane doped with ethylenediaminetetraacetic acid, Zn 2+ Exchange resin and polyvinyl chloride (PVC) membrane doped with ethylenediaminetetraacetic acid, Fe 2+ The exchange resin and the polyvinyl chloride (PVC) membrane doped with pyridine; the ion carriers 14 and the ion exchangers 15 are sandwiched between the PVB electrode 13 doped with silver chloride and the ion selective electrode 16.

[0048] Specifically, the six detection modules 12 are nitrogen detection module, phosphorus detection module, potassium detection module, magnesium detection module, zinc detection module, and iron detection module; the nitrogen detection module, phosphorus detection module, potassium detection module, magnesium detection module, zinc detection module, and iron detection module are adhered to the grain leaves and one side of the straw through the carbon nanofilm 11 as a substrate.

[0049] As a further technical solution, the nitrogen detection module includes an ion selective electrode 16 and a PVB electrode 13 doped with silver chloride, and an NH 4+ Exchange resin and polyvinyl chloride membrane doped with potassium dichromate.

[0050] As a further technical solution, the phosphorus detection module includes an ion selective electrode 16 and a PVB electrode 13 doped with silver chloride, and a PO4 3- Exchange resin with polyvinyl chloride membrane doped with sodium molybdate.

[0051] As a further technical solution, the potassium detection module includes an ion selective electrode 16 and a PVB electrode 13 doped with silver chloride. A K + Exchange resin with polyvinyl chloride membrane doped with lithium carbonate.

[0052] As a further technical solution, the magnesium detection module includes an ion selective electrode 16 and a PVB electrode 13 doped with silver chloride. A Mg electrode is arranged between the ion selective electrode 16 and the PVB electrode 13 doped with silver chloride. 2+ Exchange resin with polyvinyl chloride membrane doped with ethylenediaminetetraacetic acid.

[0053] As a further technical solution, the zinc detection module includes an ion selective electrode 16 and a PVB electrode 13 doped with silver chloride. 2+ Exchange resin with polyvinyl chloride membrane doped with ethylenediaminetetraacetic acid.

[0054] As a further technical solution, the iron detection module includes an ion selective electrode 16 and a PVB electrode 13 doped with silver chloride. A Fe 2+ Exchange resin with pyridine-doped polyvinyl chloride membrane.

[0055] Furthermore, the above-mentioned flexible stretch sensor 4 is attached to one side of the corn stalk. The flexible stretch sensor 4 has a three-layer structure, with a PDMS base layer 22 and a polyurethane protective layer 19 on the outside; a mesh silver nanowire conductive layer 20 and a silver electrode layer 21 on the inside; the electrodes are connected at both ends of the conductive layer, and only the wiring heads are exposed; specifically, it includes a PDMS base layer 22, a silver nanowire conductive layer 20, a silver electrode layer 21 and a polyurethane protective layer 19; the silver nanowire conductive layer 20 is arranged on the upper surface of the PDMS base layer 22, and the two ends of the silver electrode layer 21 are respectively silver electrode layers 21, and the polyurethane protective layer 19 is arranged on the upper surface of the silver nanowire conductive layer 20; the silver nanowire conductive layer 20 is arranged in a mesh-like staggered manner; the flexible stretch sensor 4 is connected to a low-voltage microsensor for detecting voltage changes at both ends of the electrode to determine the growth length of the grain stem veins.

[0056] Furthermore, the pin 18 of the soil NPK sensor 5 is inserted into the soil to detect the content of nitrogen, phosphorus and potassium in the soil.

[0057] The above-mentioned self-powered grain growth status flexible sensor monitoring method (principle) is as follows:

[0058] The friction nanogenerator 2 proposed in the present invention is attached to one side of a grain (e.g. corn) stalk. Two friction materials, Mo2 / PDMS and aluminum film 8, form a capacitor structure. A layer of PET tape 9 is attached between the two materials to separate them, and the interval between the tapes can be changed. Wind energy is used to shake the corn stalk, and the surfaces of the two electrode ends are periodically contacted and separated. Due to frictional electrification and electrostatic induction, an electric potential difference is generated on the electrodes, driving electrons to flow into the circuit, providing power for each module of the system.

[0059] The flexible electronic sensor 3 proposed in the present invention uses a pin 18 to break a small hole in the corn stalk to allow the juice to flow out, and then enter the resin and PVC film after passing through the carbon nanofilm 11 and the PVB electrode 13 doped with silver chloride. Each detection target ion will combine with the ion carrier 14 and undergo an exchange reaction, thereby improving the selectivity of each subsequent ion selective electrode 16 to each target ion, and then the concentration is detected by the micro electrochemical sensor 17.

[0060] The flexible stretch sensor 4 proposed in the present invention is attached to one side of the straw through a PDMS film. After growth, the flexible stretch sensor 4 is stretched as the covered straw range increases, and the internal silver nanowires are stretched and deformed to change the resistance, thereby changing the voltage at both ends of the electrode. Finally, the flexible sensor and the soil NPK sensor 5 transmit the collected data to the GSM communication module 6, and finally transmit the data to the user end through the GSM communication module 6; to achieve the effect of self-powered grain monitoring.

Claims

1. A self-powered flexible sensor monitoring system for grain growth status, characterized in that: Including friction nanogenerator, voltage stabilization module, flexible electronic sensor, flexible stretch sensor, soil NPK sensor, GSM communication module; The flexible electronic sensor is arranged on the leaves of the grains and is used to detect the contents of nitrogen, phosphorus, potassium, magnesium, zinc and iron in the leaves of the grains respectively; The flexible stretch sensor, friction nanogenerator, and voltage stabilization module are arranged on the straw; wherein the flexible stretch sensor is used to monitor the growth length of grain stem veins; The soil NPK sensor is arranged in the soil to detect the content of nitrogen, phosphorus and potassium in the soil; The serial lines of the flexible electronic sensor, the flexible tensile sensor and the soil NPK sensor are connected to the GSM communication module, and the power lines of the flexible electronic sensor, the flexible tensile sensor, the soil NPK sensor and the GSM communication module are connected to the voltage stabilizing module and then to the friction nanogenerator; the GSM communication module is hung on the leaves of the grain; The flexible stretch sensor has a three-layer structure, with a PDMS base layer and a polyurethane protective layer on the outside; a mesh silver nanowire conductive layer and a silver electrode layer on the inside; the electrodes are connected to both ends of the conductive layer, with only the wiring ends exposed; The flexible electronic sensor includes six detection modules, namely, a nitrogen detection module, a phosphorus detection module, a potassium detection module, a magnesium detection module, a zinc detection module, and an iron detection module; the nitrogen detection module, the phosphorus detection module, the potassium detection module, the magnesium detection module, the zinc detection module, and the iron detection module are adhered to one side of the grain leaves and the straw through a carbon nanofilm as a substrate; The flexible electronic sensor comprises a carbon nanofilm, an ion carrier, an ion exchanger, a PVB electrode doped with silver chloride, an ion selective electrode and a micro electrochemical sensor.

2. The self-powered grain growth status flexible sensor monitoring system according to claim 1, characterized in that: The friction nanogenerator is composed of a Mo2 / PDMS film, an aluminum film, and a PET tape; the Mo2 / PDMS film includes polydimethylsiloxane and nano-metal molybdenum, the polydimethylsiloxane is a base material, and the nano-metal molybdenum is covered on the polydimethylsiloxane as a conductive material; the aluminum film is used as another electrode; The PET tape is divided into two layers, the upper layer is bonded to the Mo2 / PDMS film, and the lower layer is bonded to the aluminum film.

3. The self-powered grain growth status flexible sensor monitoring system according to claim 1, characterized in that: The nitrogen detection module comprises an ion selective electrode and a PVB electrode doped with silver chloride, and a NH 4+ Exchange resin and polyvinyl chloride membrane doped with potassium dichromate.

4. The self-powered grain growth status flexible sensor monitoring system according to claim 1, characterized in that: The phosphorus detection module comprises an ion selective electrode and a PVB electrode doped with silver chloride, and a PO4 3- Exchange resin with polyvinyl chloride membrane doped with sodium molybdate.

5. The self-powered grain growth status flexible sensor monitoring system according to claim 3, characterized in that: The potassium detection module comprises an ion selective electrode and a PVB electrode doped with silver chloride, and a K + Exchange resin with polyvinyl chloride membrane doped with lithium carbonate.

6. The self-powered grain growth status flexible sensor monitoring system according to claim 3, characterized in that: The magnesium detection module comprises an ion selective electrode and a PVB electrode doped with silver chloride, and a Mg 2+ Exchange resin with polyvinyl chloride membrane doped with ethylenediaminetetraacetic acid.

7. The self-powered grain growth status flexible sensor monitoring system according to claim 3, characterized in that: The zinc detection module comprises an ion selective electrode and a PVB electrode doped with silver chloride. 2+ Exchange resin with polyvinyl chloride membrane doped with ethylenediaminetetraacetic acid.

8. The self-powered grain growth status flexible sensor monitoring system according to claim 3, characterized in that: The iron detection module comprises an ion selective electrode and a PVB electrode doped with silver chloride, and a Fe 2+ Exchange resin with pyridine-doped polyvinyl chloride membrane.

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