CN115550871A - Self-powered multi-parameter wireless sensing system based on friction nano generator - Google Patents
Self-powered multi-parameter wireless sensing system based on friction nano generator Download PDFInfo
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- CN115550871A CN115550871A CN202211343421.5A CN202211343421A CN115550871A CN 115550871 A CN115550871 A CN 115550871A CN 202211343421 A CN202211343421 A CN 202211343421A CN 115550871 A CN115550871 A CN 115550871A
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- 230000003993 interaction Effects 0.000 claims description 11
- 238000010248 power generation Methods 0.000 claims description 9
- 230000001939 inductive effect Effects 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 6
- 239000003989 dielectric material Substances 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 4
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- 229910002113 barium titanate Inorganic materials 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N1/00—Electrostatic generators or motors using a solid moving electrostatic charge carrier
- H02N1/04—Friction generators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The invention discloses a self-powered multi-parameter wireless sensing system based on a friction nano generator. Belongs to the technical field of wireless sensing. The system mainly comprises a friction nanometer generator integrated with a synchronous switch, two or more mutually coupled RLC resonators, a transmitter and a receiver. One end of the friction nano generator is connected with the synchronous switch, and the other ends of the friction nano generator and the synchronous switch output signals. Two or more mutually coupled RLC resonators convert the output signal of the friction nanogenerator into an oscillating signal carrying a plurality of sensing information. The transmitter and the receiver are used for transmitting and receiving sensing signals. Because multiple resonators are used, each resonator can contain up to three sensors, and the system can simultaneously monitor multiple sensing parameters. The application prospect of the self-powered wireless sensor system is increased, and the application range is expanded.
Description
Technical Field
The invention belongs to the technical field of wireless sensing, relates to a self-powered sensing system, and particularly relates to a self-powered multi-parameter wireless sensing system based on a friction nano generator.
Background
The wireless sensing network is composed of a plurality of sensor nodes, and each sensor node is connected with different sensors. Sensors distributed at different places monitor environmental changes, and then sensing information is transmitted to the human-computer interaction device through the wireless communication module by the sensing nodes. Conventional batteries are unable to meet the energy requirements of sensor networks containing a large number of sensors. Also when the sensor devices are distributed in places that are difficult to directly contact, such as implanted sensors, maintenance and replacement of the batteries will be a difficult task. The internet of things (IoT) uses trillions of sensors and sensor nodes, which would greatly increase maintenance resources. Cost and power consumption have become key factors hindering the development of wireless sensor networks and internet of things.
To solve the above problems, a great deal of research has been focused on energy harvesting techniques that are capable of converting various forms of energy in the environment into electrical energy, powering electrical devices and wireless sensor networks, such as solar energy, thermal energy, mechanical energy, and even electromagnetic wave energy. However, these energy harvesting devices either serve as an auxiliary power source and cannot be used as a stand-alone battery; or it takes a long time to collect energy and then store it in a capacitor before powering the sensor device, and it is not possible to power the device at the energy collecting means, i.e. not sensing in real time.
Recently, a new self-powered wireless sensing system based on a tribo nano-generator (TENG) has emerged. The sensing system can directly convert the pulse voltage generated by TENG into a damped oscillation signal with sensing information. The sensing system directly uses TENG as a power supply, so that a series of energy conversion processes are avoided, and the energy utilization efficiency is very high. However, such TENG-based wireless sensing systems all use a single resonator to generate the sensing signal, and the available sensing parameters are relatively limited.
Disclosure of Invention
In view of the above, the present invention provides a self-powered multi-parameter wireless sensing system based on a friction nano-generator, so as to overcome the defects in the prior art.
The purpose of the invention is realized by the following technical scheme: the utility model provides a from power supply multiparameter wireless sensing system based on friction nanometer generator, includes power generation module, syntonizer module, transmitter, receiver and human-computer interaction device, power generation module includes friction nanometer generator and synchro switch, the one end of friction nanometer generator is connected with synchro switch's one end, and the other end of friction nanometer generator and synchro switch's the equal output signal of the other end of synchronous switch give the syntonizer module, the syntonizer module turns into the oscillation signal who carries a plurality of sensing information with the output signal of friction nanometer generator and carries and give the transmitter and launch, the receiver accepts the oscillation signal and transmits for the human-computer interaction device.
Preferably, the resonator module comprises at least two RLC resonators coupled to each other.
Preferably, the RLC resonators are series RLC resonators or parallel RLC resonators.
Preferably, the coupling mode of the RLC resonator in the resonator module is full inductive coupling, or full capacitive coupling, or a combination mode of inductive coupling and capacitive coupling.
Preferably, the RLC resonator in the resonator module is inductively coupled, and the coupled inductor is a corresponding T-type equivalent circuit or a pi-type equivalent circuit.
Preferably, the resistor R, the inductor L and the capacitor C in the RLC resonator may all be replaced by a corresponding type of sensor.
Preferably, the friction nano-generator is a friction nano-generator in a vertical separation contact mode, a horizontal sliding mode, or a single electrode mode.
Preferably, the transmitter is a laser diode, and the receiver is a photodiode; and the transmitter and the receiver are wirelessly sensed in a laser communication mode.
Preferably, the RLC resonator is used as a transmitter, and the receiver is a near-field magnetic field antenna; the transmitter and the receiver are wirelessly sensed by means of magnetic field near-field coupling.
Preferably, the synchronous Switch is a mechanical Switch or an electronic Switch E-Switch.
Compared with the prior art, the invention has the following advantages:
the invention can efficiently convert the energy generated by the friction nano generator into an oscillation signal carrying sensing information and wirelessly transmit the oscillation signal without external power supply. Existing friction nanogenerator-based wireless sensing systems all use a single resonator to generate a sensing signal, and the available sensing parameters are relatively limited. The present invention uses a plurality of mutually coupled RLC resonators to generate an oscillating signal carrying sensing information. Each resonator contains two or more sensors. Therefore, a plurality of sensing parameters can be monitored simultaneously, and the application prospect of the self-powered wireless sensing system is further increased.
Drawings
FIG. 1 is a schematic block diagram of the circuit of the present invention;
fig. 2 is a schematic structural diagram of a self-powered multi-parameter wireless sensing system based on a friction nano-generator in embodiment 1 of the present invention;
fig. 3 is a spectrum diagram of received signal waveforms when the descending distances of the free end of the cantilever beam are 14mm,34mm,38mm and 47mm, respectively, in embodiment 1 of the present invention, in which the resistive sensor S4 on the cantilever beam is connected to the resonator L1.
Fig. 4 is a frequency spectrum diagram of waveforms of received signals when the descending distances of the free end of the cantilever beam are 0mm,30mm,60mm, and 80mm, respectively, in embodiment 1 of the present invention, where the capacitive sensor S2 on the cantilever beam is connected to the resonator L2.
Fig. 5 is a frequency spectrum diagram of waveforms of received signals when the descending distances of the free end of the cantilever beam are 0mm,30mm,50mm, and 80mm, respectively, in embodiment 1 of the present invention, where three capacitive sensors S1, S2, and S3 on the cantilever beam are respectively and correspondingly connected to resonators L1, L2, and L3.
In the figure, 1, a power generation module; 2. a resonator module; 3. a transmitter; 4. a receiver; 5. a human-computer interaction device; 6. a cantilever beam.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to specific embodiments. It is to be understood that the following examples are only illustrative and explanatory of the present invention and should not be construed as limiting the scope of the present invention. All the technologies realized based on the above-mentioned contents of the present invention are covered in the protection scope of the present invention.
As shown in figure 1, the self-powered multi-parameter wireless sensing system based on the friction nano generator comprises a power generation module 1, a resonator module 2, a transmitter 3, a receiver 4 and a human-computer interaction device 5, wherein the power generation module 1 comprises the friction nano generator and a synchronous switch, one end of the friction nano generator is connected with one end of the synchronous switch, the other end of the friction nano generator and the other end of the synchronous switch both output signals to the resonator module 2, the resonator module 2 converts the output signals of the friction nano generator into oscillation signals carrying a plurality of sensing information and transmits the oscillation signals to the transmitter 3 for transmission, and the receiver 4 receives the oscillation signals and transmits the oscillation signals to the human-computer interaction device 5.
The friction nano-generator can adopt a vertical separation contact mode, a horizontal sliding mode or a single-electrode mode.
The RLC resonator in the resonator module 2 is coupled in a full inductive coupling mode, a full capacitive coupling mode, or a combined inductive coupling and capacitive coupling mode. The resistor R, inductor L and capacitor C in the RLC resonator can all be replaced with corresponding types of sensors to sense changes in the environment while enabling multi-parameter sensing. When the tribo nanogenerator is triggered by an external mechanical force, a series of pulse signals are generated. Energy contained in the pulse signals is injected into one RLC resonator, and a plurality of RLC resonators are coupled with one another to generate oscillation signals with a plurality of resonant frequencies.
Example 1:
as shown in fig. 2, the self-powered multi-parameter wireless sensing system based on the friction nano-generator of the embodiment includes a power generation module 1, a resonator module 2, a cantilever beam 6, a receiver 4 and a human-computer interaction device 5, wherein the resonator adopts an inductive coupling mode, and a T-type equivalent circuit or a pi-type equivalent circuit is used to replace mutual inductance, so as to reduce the size of the sensor system.
Specifically, the friction nano-generator in the power generation module 1 adopts a vertical separation contact mode, and polyamide 6 (PA 6) and Polydimethylsiloxane (PDMS) are used as friction electrodes. The integrated synchronous Switch can be a mechanical Switch or an electronic Switch E-Switch. The use of a synchronous switch enables the energy input to the resonator module 2 to be increased by reducing the output impedance of the tribo nanogenerator to establish a potential difference across the resonator.
The resonator module 2 is disposed on the cantilever arm, and the resonator module 2 includes three RLC resonators coupled to each other. The three RLC resonators may be in either series or parallel configuration.
The inductors L of the three RLC resonators consist of three mutually coupled inductances of 10cm diameter, L1, L3 and L2 from left to right, the corresponding inductances being 88.9, 40.1 and 63.8 muh, respectively. The three inductances are different in order to construct resonators of different resonance frequencies. The three inductors are coaxially distributed, and the distance between the three inductors is 3.5 cm. The middle inductor L3 is directly connected with TENG to obtain energy, and the other two inductors are coupled with the inductor L3. The length, width and thickness of the cantilever beam 6 are 25cm, 3.5cm and 1mm respectively, and one end is fixed. In the embodiment, the three capacitors C adopt capacitive strain sensors S1, S2 and S3 which are sequentially arranged on the cantilever beam from left to right and are respectively 6.2cm, 8.5cm and 10.6cm away from the fixed end of the cantilever beam 6, and the capacitive strain sensors adopt parallel plate capacitors with the effective area of 10mm multiplied by 10 mm. The dielectric material is a PVDF film doped with BaTiO3 (BTO) nanoparticles having an average diameter of about 100 nm. The dielectric PVDF film with a porous structure has certain mechanical strength and elasticity, and can restore the state after being pressed or bent. When the cantilever is bent, its upper surface is under tensile strain and its lower surface is under compressive strain. The dielectric material on the upper surface of the cantilever beam 6 is lengthened and thinned under the action of tensile strain; when the cantilever beam 6 is bent, the support structure also exerts pressure on the dielectric material, further resulting in a tendency for the dielectric material to thin. The thinning of the dielectric material results in an increase in the capacitance of the sensor. A resistive strain sensor S4 is also provided as a resistor R on the cantilever beam and is fixed 13.4 cm from the fixed end of the cantilever beam 6. The four sensors are connected with inductors L1, L2 and L3 to form resonators which are distributed at different positions of the cantilever to measure strain distribution at different positions. In this embodiment, the resonator module 2 is also used as the transmitter 3.
The receiver 4 adopts an inductor L4 with a diameter of 10cm, which is 31.5m away from the transmitter, and receives the transmitted signal through inductive coupling, and transmits the data to the human-computer interaction device 5, in this embodiment, the human-computer interaction device 5 is a PC, and the PC receives the data and inputs the data into LabVIEW software installed therein for processing.
In use, the resistive strain sensor S4 is first connected to the inductance L1, and then the initial resonant frequencies of the three resonators are tuned to 1.501, 2.087 and 2.710MHz, respectively, using additional capacitors in parallel with the resonators. The measured frequency spectrum diagrams of the received signal waveforms when the descending distances of the free end of the cantilever beam 6 are 14mm,34mm,38mm and 47mm are respectively shown in fig. 3. Then, the capacitive strain sensor S2 is connected to the inductor L2, the resonator is tuned to the initial frequency, and the spectrograms of the received signal waveforms when the descending distances of the free end of the cantilever beam 6 are respectively 0mm,30mm,60mm and 80mm are measured are shown in fig. 4. Finally, the three capacitive strain sensors S1, S2, and S3 are respectively and correspondingly connected to the inductors L1, L2, and L3, the resonator is tuned to the initial frequency, and the spectrograms of the received signal waveforms when the descending distances of the free end of the cantilever beam 6 are respectively 0mm,30mm,50mm, and 80mm are measured are shown in fig. 5.
Example 2:
the present embodiment is different from embodiment 1 in that the transmitter 3 employs a laser diode, and the receiver 4 employs a photodiode, and the two are wirelessly sensed by means of laser communication. The implementation is more convenient, the size of the equipment is small, and the information capacity is large.
Example 3:
compared with the embodiment 1, the difference of this embodiment is that the RLC resonator in the resonator module 2 itself serves as the transmitter 3, and the receiver 4 adopts a near-field magnetic field antenna, and the two wirelessly sense in a magnetic field near-field coupling manner.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments, or alternatives may be employed, by those skilled in the art, without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. The self-powered multi-parameter wireless sensing system based on the friction nano generator is characterized by comprising a power generation module (1), a resonator module (2), a transmitter (3), a receiver (4) and a human-computer interaction device (5), wherein the power generation module (1) comprises the friction nano generator and a synchronous switch, one end of the friction nano generator is connected with one end of the synchronous switch, the other end of the friction nano generator and the other end of the synchronous switch output signals to the resonator module (2), the resonator module (2) converts the output signals of the friction nano generator into oscillation signals carrying a plurality of sensing information and transmits the oscillation signals to the transmitter (3), and the receiver (4) receives the oscillation signals and transmits the oscillation signals to the human-computer interaction device (5).
2. A self-powered multiparameter wireless sensing system based on a triboelectric nanogenerator according to claim 1, wherein the resonator module (2) comprises at least two RLC resonators coupled to each other.
3. The self-powered multi-parameter wireless sensing system based on a friction nanogenerator according to claim 2, wherein the RLC resonators are series RLC resonators or parallel RLC resonators.
4. The self-powered multi-parameter wireless sensing system based on the friction nanogenerator as claimed in claim 2 or 3, wherein the coupling mode of the RLC resonator in the resonator module (2) is full inductive coupling, full capacitive coupling or a combination mode of inductive coupling and capacitive coupling.
5. The self-powered multi-parameter wireless sensing system based on the friction nano generator as claimed in claim 4, wherein the RLC resonator in the resonator module (2) is inductively coupled, and the coupled inductor is a corresponding T-type equivalent circuit or pi-type equivalent circuit.
6. A self-powered multi-parameter wireless sensing system based on triboelectric nanogenerator according to claim 2 or 3, wherein the resistor R, inductor L and capacitor C in the RLC resonator can be replaced by corresponding types of sensors.
7. The self-powered multi-parameter wireless sensing system based on the friction nano-generator as claimed in claim 1, 2 or 3, wherein the friction nano-generator is a friction nano-generator with a vertical separation contact mode, a horizontal sliding mode or a single electrode mode.
8. A self-powered multiparameter wireless sensing system based on a triboelectric nanogenerator according to claim 1, 2 or 3, wherein the transmitter (3) is a laser diode and the receiver (4) is a photodiode; and the transmitter (3) and the receiver (4) are wirelessly sensed in a laser communication mode.
9. A self-powered multiparameter wireless sensing system based on a triboelectric nano-generator according to claim 1 or 3, characterized in that the RLC resonator acts as transmitter (3), the receiver (4) is a near-field magnetic field antenna; and the transmitter (3) and the receiver (4) are wirelessly sensed in a magnetic field near-field coupling mode.
10. A self-powered multi-parameter wireless sensing system based on triboelectric nanogenerator according to claim 1, 2 or 3, characterized in that the synchronous Switch is a mechanical Switch or an electronic Switch E-Switch.
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| CN110365122A (en) * | 2019-06-03 | 2019-10-22 | 杭州电子科技大学 | Self energizing wireless sensing system based on friction nanometer power generator |
| CN114301327A (en) * | 2021-11-19 | 2022-04-08 | 浙江大学杭州国际科创中心 | Self-driven wireless sensing system based on friction nano generator |
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- 2022-10-28 CN CN202211343421.5A patent/CN115550871A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103636098A (en) * | 2011-06-10 | 2014-03-12 | 捷通国际有限公司 | System and method for detecting, characterizing, and tracking inductive power receiver |
| US20160254703A1 (en) * | 2013-11-11 | 2016-09-01 | Thoratec Corporation | Resonant power transfer systems with communications |
| CN105427570A (en) * | 2015-12-29 | 2016-03-23 | 中电科技德清华莹电子有限公司 | Passive and wireless telemetering interface chip for general reactance-type sensing element |
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| CN110365122A (en) * | 2019-06-03 | 2019-10-22 | 杭州电子科技大学 | Self energizing wireless sensing system based on friction nanometer power generator |
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