Self-powered position sensor based on nanotriboelectricity

Abstract

The present invention provides a self-powered position sensor based on nano-triboelectricity, which includes a power generation component, a support component and a conduction component, wherein the power generation component is connected to a first mounting end of the support component, and the conduction component is connected to a second mounting end of the support component. The power generation sheets are evenly distributed along the length direction of the touch layer, and the support bars are symmetrically distributed on both sides of the base; the mounting ends on both sides of the resistance wire are respectively fixed to the left grounding plate and the right grounding plate, the first left electrode and the second left electrode are located on the side of the resistance wire close to the left grounding plate, the first right electrode and the second right electrode are located on the side of the resistance wire close to the right grounding plate, the first left electrode and the second left electrode are respectively connected to the first copper wire conductor and the second copper wire conductor, and the first right electrode and the second right electrode are respectively connected to the third copper wire conductor and the fourth copper wire conductor. The present invention can simultaneously identify multiple external stimuli through dual interfaces and a single mechanism, has high flexibility and agility, and has high practical application value.

Description

Technical Field

[0001] The present invention relates to the field of nano-new energy technology, and in particular to a self-powered position sensor based on nano-triboelectricity. Background Art

[0002] The sensory and nervous systems of organisms play an important role in monitoring external stimuli, controlling and receiving limb feedback. Imitating the sensory and nervous systems of organisms to build bionic sensor devices for establishing human-computer interaction interfaces and monitoring various environmental information has attracted widespread attention from researchers around the world. In the past few decades, although bionic sensor devices that imitate the functions of biological sensory systems and biological nervous systems have made great achievements, most bionic sensor devices still face the following challenges:

[0003] The inability to sense multiple external stimuli simultaneously is crucial for sensing the surrounding environment and minimizing damage. However, most biomimetic sensing devices can only detect a unique sensing parameter, and achieving multifunctional sensing through a single mechanism remains a huge challenge. Most biomimetic sensing devices are integrated with multiple independent components. To achieve higher resolution and multifunctional sensing, the number of sensors and electrodes needs to be greatly increased, which will require complex interconnections and complex structures, and may cause interference in signal transmission. Although biomimetic sensing devices have made significant progress in flexibility and flexibility, in traditional biomimetic sensing devices, external power supplies or batteries are always indispensable. Traditional battery-based biomimetic sensing devices have disadvantages such as short life, regular charging, frequent replacement, and high risk of environmental pollution.

[0004] Nanotriboelectricity uses the phenomena of contact electrification and electrostatic induction to convert the energy in the surrounding environment into electrical output, which can be used as a power source or sensor signal. Therefore, the emergence of nanotriboelectricity provides an ideal method to realize biomimetic sensing devices with self-powered capabilities.

[0005] In summary, there is an urgent need for a nanotriboelectric self-powered position sensor that can simultaneously recognize multiple external stimuli through dual interfaces and a single mechanism. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides a self-powered position sensor based on nano-triboelectricity, which mainly arranges a resistance wire made of a carbon nanotube solution with a content of 5% to 10% on a supporting component, and forms a self-powered device with a power generation component. When the touch layer of the power generation component is touched, the voltage signals emitted by the left electrode and the right electrode are measured respectively to determine the size of the left and right shunted currents, thereby determining the current shunt point, thereby achieving precise positioning of the touch position, and providing a basis for the rapid perception of the flexible sensor.

[0007] The present invention provides a self-powered position sensor based on nano-triboelectricity, which includes a power generation component, a support component and a conduction component, wherein the power generation component is connected to a first mounting end of the support component, and the conduction component is connected to a second mounting end of the support component. The power generation component comprises a touch layer and power generation sheets, and the power generation sheets are evenly distributed along the length direction of the touch layer; the support component comprises a support bar and a base, and the support bars are symmetrically distributed on both sides of the base and fixedly connected to both sides of the base; the conduction component comprises a ground plate, a left electrode, a right electrode, a copper wire conductor and a resistance wire, the first mounting end and the second mounting end of the resistance wire are respectively fixedly connected to the left ground plate and the right ground plate, the first left electrode and the second left electrode are located on the side of the resistance wire close to the left ground plate, the first end of the first left electrode and the second left electrode are fixedly connected to the third mounting end and the fourth mounting end of the resistance wire, the first right electrode and the second right electrode are located on the side of the resistance wire close to the right ground plate, the first end of the first right electrode and the second right electrode are fixedly connected to the fifth mounting end and the sixth mounting end of the resistance wire, the second end of the first left electrode and the second left electrode are respectively connected to the first copper wire conductor and the second copper wire conductor, and the second end of the first right electrode and the second right electrode are respectively connected to the third copper wire conductor and the fourth copper wire conductor;

[0008] The sensing distance L1 between the first end and the second end of the generator sheet to be triggered and the left grounding plate and the sensing distance L2 between the right grounding plate are determined by the following expressions:

[0009]

[0010]

[0011] Where L is the length of the resistor wire, V1 represents R C1 The induced voltage across the two ends, V2 represents R C2 The induced voltage across R C1 The resistor R is the 15mm wide resistor at the left end of the resistor line. C2 The resistor is 15mm wide at the right end of the resistor wire.

[0012] Preferably, the touch layer, the support bar and the base are of equal length.

[0013] Preferably, the distance between the first left electrode and the second left electrode is 15 mm, and the distance between the first right electrode and the second right electrode is 15 mm.

[0014] Preferably, the voltage V generated by the power generation component is expressed as follows:

[0015]

[0016] In the formula, ε o is the dielectric constant of the touch layer, ε r is the relative dielectric constant, σ o is the friction charge density of the touch layer, d is the sensing distance, Δσ is the transfer charge density on the ground plate, x(t) is the distance between the generator and the resistor wire, and t is the sensing time.

[0017] Preferably, the resistance wire of the conductive component is made of a carbon nanotube solution with a content of 10%.

[0018] Preferably, the power generation component is equivalent to a power supply and a resistor R3, and the resistor with a width of 15 mm at the leftmost end of the resistance line is set to R C1 , the 15mm wide resistor at the right end of the resistor line is set as R C2 , and in R C1 and R C2 Connect a voltmeter in parallel at both ends of the touch power generation component from the touch layer to the resistor R C1 The resistance between them is R1, and the resistance between the touch layer in the touch power generation component and the resistor R C2 The resistor between R1 and R C1 The left current is composed of R2 and R C2 An ammeter is connected in series between the right currents respectively, and the left current and the right current are connected in parallel and then connected in series with the two ends of the power generation component to form a parallel circuit. Therefore, when the touch layer in the power generation component is touched, self-power is supplied. The specific expression of the voltage U0 generated by the power generation sheet is as follows:

[0019]

[0020] Where U 并 is the voltage of the parallel circuit, is the resistance of the parallel circuit, R1 and R2 represent the contact position and R C1 and R C2 The resistance between them, R3 is the internal resistance of the generator.

[0021] Another aspect of the present invention provides a method for identifying a self-powered position sensor based on nanotriboelectricity, comprising the following steps:

[0022] S1. Build a self-powered position sensor;

[0023] S2. Calculate perception parameters, wherein the perception parameters include perception distance d, perception time t and perception speed v;

[0024] S3. Output the perception result of the self-powered position sensor in the current state according to the perception parameters calculated in S2.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1. In the present invention, when the touch layer is touched, the rubber of the touch layer will be deformed, so that the power generation sheet will contact the resistance line to form a path. Due to electrostatic induction and contact electrification, current will be generated between the power generation sheet and the left and right grounding plates. The current will be shunted when it contacts the resistance line, with one part flowing to the left grounding plate and the other part flowing to the right grounding plate. The size of the current shunting is affected by the size of the resistance at both ends, providing a basis for position determination.

[0027] 2. The present invention determines the size of the left and right currents by measuring the voltage signals emitted by the left and right electrodes, thereby determining the current shunt point and determining the touch position; by using two interfaces for signal collection, multi-stimulation position recognition can be achieved, avoiding problems such as redundant line connections and signal crosstalk caused by complex lines.

[0028] 3. The present invention determines the contact time between the finger and the touch layer by detecting the time difference between the positive voltage generated when the finger contacts and the negative voltage generated when the finger leaves.

[0029] 4. The present invention detects the voltage signals of the left and right electrodes and infers the voltage generated on the power generation sheet, thereby determining the touch speed.

[0030] 5. The materials used in the present invention are all flexible materials, which can be used as wearable sensors. By touching different positions as input signals, they can be used for human-computer interaction and can issue instructions to virtual or real instruments. At the same time, it can help patients perceive the contact of the outside world with the specific position of the prosthesis or limbs. The self-powered function does not require an external power supply, further expanding the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural diagram of the power generation component in the self-powered position sensor based on nano-triboelectricity of the present invention;

[0032] Figure 2 This is a structural diagram of the supporting component in the self-powered position sensor based on nano-triboelectricity of the present invention;

[0033] Figure 3 It is a structural diagram of the conduction component in the self-powered position sensor based on nano-triboelectricity of the present invention;

[0034] Figure 4 It is an assembly diagram of the supporting component and the conducting component in the self-powered position sensor based on nano-triboelectricity of the present invention;

[0035] Figure 5 This is a structural diagram of the self-powered position sensor based on nano-triboelectricity without a touch layer in the present invention;

[0036] Figure 6 The overall structure diagram of the self-powered position sensor based on nano-triboelectricity of the present invention;

[0037] Figure 7 The equivalent circuit diagram of the self-powered position sensor based on nano-triboelectricity of the present invention;

[0038] Figure 8a and 8b This is a diagram of measured voltages of the left electrode and the right electrode when the contact position No. 1 is pressed in the nano-triboelectric self-powered position sensor of the present invention;

[0039] Figure 9a and 9b This is a diagram of measured voltages of the left electrode and the right electrode when the contact position No. 2 is pressed in the nano-triboelectric self-powered position sensor of the present invention;

[0040] Fig.10a and 10b This is a diagram of measured voltages of the left electrode and the right electrode when the contact position No. 3 is pressed in the nano-triboelectric self-powered position sensor of the present invention;

[0041] Fig.11a and 11b This is a diagram of measured voltages of the left electrode and the right electrode when the contact position No. 4 is pressed in the self-powered position sensor based on nano-triboelectricity of the present invention;

[0042] Fig.12a and 12b This is a diagram of the measured voltages of the left electrode and the right electrode when the contact position No. 5 is pressed in the self-powered position sensor based on nano-triboelectricity of the present invention.

[0043] Main reference numerals:

[0044] Touch layer 1, power generation sheet 2, support bar 3, base 4, left grounding plate 501, right grounding plate 502, first left electrode 601, second left electrode 602, first right electrode 603, second right electrode 604, first copper wire conductor 701, second copper wire conductor 702, third copper wire conductor 703, fourth copper wire conductor 704, resistance wire 8. DETAILED DESCRIPTION

[0045] In order to fully describe the technical content, structural features, objectives and effects of the present invention, the following will be described in detail with reference to the accompanying drawings.

[0046] The self-powered position sensor based on nano-triboelectricity uses the phenomena of contact electrification and electrostatic induction to convert the energy in the surrounding environment into electrical signal output, which can realize the recognition of touch position, speed and time, and does not require external power supply. The entire device is flexible and deformable, and the scope of application is further expanded. The dual-interface connection method can avoid complex interconnections and structures, and can also prevent signals from being interfered with during transmission. Figure 5 and Figure 6 As shown, it includes a power generation component, a support component and a conduction component. The power generation component is connected to a first mounting end of the support component, and the conduction component is connected to a second mounting end of the support component.

[0047] Power generation components, such as Figure 1 As shown, it includes a touch layer 1 and a power generation sheet 2, and the power generation sheet 2 is evenly distributed along the length direction of the touch layer 1; preferably, the expression of the voltage V generated by the power generation component is as follows:

[0048]

[0049] In the formula, ε o is the dielectric constant of the touch layer, ε r is the relative dielectric constant, σ o is the friction charge density of the touch layer, d is the sensing distance, Δσ is the transfer charge density on the ground plate, x(t) is the distance between the generator and the resistor wire, and t is the sensing time.

[0050] Support components, such as Figure 2 and Figure 4 As shown, it includes support bars 3 and a base 4. The support bars 3 are symmetrically distributed on both sides of the base 4 and fixedly connected to both sides of the base 4. The touch layer 1, the support bars 3 and the base 4 are equal in length.

[0051] Conductive components, such as Figure 3 and Figure 4 As shown, it includes a left grounding plate 501, a right grounding plate 502, a first left electrode 601, a second left electrode 602, a first right electrode 603, a second right electrode 604, a first copper wire conductor 701, a second copper wire conductor 702, a third copper wire conductor 703, a fourth copper wire conductor 704 and a resistor wire 8.

[0052] The resistance wire 8 of the conductive component is evenly coated on paper with a carbon nanotube solution containing 10%, dried, and cut to make it conductive. The resistance of the resistance wire 8 can reach 1M ohm per centimeter, and its length is proportional to its resistance value. Therefore, when the current flows from the power generation sheet 2 to the left grounding plate 501 and the right grounding plate 502 respectively, a shunt is generated, and the magnitude of the current on both sides is inversely proportional to the magnitude of the resistance in the resistance wire 8 on both sides, so the magnitude of the current on both sides is inversely proportional to the magnitude of the length of the resistance wire 8 on both sides. The distance between the two patches of the left and right electrodes is 15mm, so measuring the voltage signal emitted by the left and right electrodes is equivalent to detecting the voltage of a resistor with a resistance value of 1.5M ohms. The magnitude of the left and right currents of the shunt can be determined by detecting the voltage on the left and right electrodes, thereby determining the distance from the current shunt point to the left and right grounding plates, thereby determining the touch position.

[0053] The first mounting end and the second mounting end of the resistance wire 8 are fixedly connected to the left grounding plate 501 and the right grounding plate 502 respectively, the first left electrode 601 and the second left electrode 602 are located on the side of the resistance wire 8 close to the left grounding plate 501, the first ends of the first left electrode 601 and the second left electrode 602 are fixedly connected to the third mounting end and the fourth mounting end of the resistance wire 8, the first right electrode 603 and the second right electrode 604 are located on the side of the resistance wire 8 close to the right grounding plate 502, the first ends of the first right electrode 603 and the second right electrode 604 are fixedly connected to the fifth mounting end and the sixth mounting end of the resistance wire 8, the second ends of the first left electrode 601 and the second left electrode 602 are connected to the first copper wire conductor 701 and the second copper wire conductor 702 respectively, and the second ends of the first right electrode 603 and the second right electrode 604 are connected to the third copper wire conductor 703 and the fourth copper wire conductor 704 respectively.

[0054] Assume that the voltage measured at the left electrode is V1, the voltage measured at the right electrode is V2, and the current passing through the left resistor is:

[0055]

[0056] The current through the resistor on the right is:

[0057]

[0058] According to the fact that the ratio of the currents in two parallel resistors is inversely proportional to the ratio of the resistance values, the following expression can be obtained:

[0059]

[0060] Since the resistance is proportional to the length of the resistance wire 8, the ratio of the sensing distance L1 from the contact point of the to-be-triggered generator 2 to the left grounding plate 501 and the sensing distance L2 from the right grounding plate 502 is expressed as follows:

[0061]

[0062] L1+L2=L.

[0063] Through the above derivation, it can be known that the sensing distance L1 between the first end and the second end of the to-be-triggered power generation sheet 2 and the left grounding plate 501 and the sensing distance L2 between the right grounding plate 502 are respectively determined by the following expressions:

[0064]

[0065]

[0066] Where L is the length of the resistor wire 8, V1 represents R C1 The induced voltage across the two ends, V2 represents R C2 The induced voltage across R C1 The leftmost 15mm width resistor of resistor line 8, R C2 The resistor is 15 mm wide at the rightmost end of the resistor wire 8.

[0067] Specifically, the distance between the first left electrode 601 and the second left electrode 602 is 15 mm, and the distance between the first right electrode 603 and the second right electrode 604 is 15 mm.

[0068] like Figure 7 As shown, the power generation component is equivalent to a power supply and a resistor R3. The power generation sheet 2 is equivalent to a power supply with a very large internal resistance, whose internal resistance is R3. The resistance of the leftmost 15mm width of the resistance line 8 is set to R C1 , the 15mm wide resistor at the right end of resistor line 8 is set as R C2 , and in R C1 and R C2 Connect a voltmeter in parallel at both ends of the touch power generation component from the touch layer 1 to the resistor R C1 The resistance between them is R1, and the resistance between the touch layer 1 in the touch power generation component and the resistance R C2 The resistor between R1 and R C1 The left current is composed of R2 and R C2 An ammeter is connected in series between the right currents respectively, and the left current and the right current are connected in parallel and then connected in series with the two ends of the power generation component to form a parallel circuit. Therefore, when the touch layer 1 in the power generation component is touched, self-power is supplied, and the specific expression of the voltage U0 generated by the power generation sheet 2 is as follows:

[0069]

[0070] Where U 并 is the voltage of the parallel circuit, The resistance of the parallel circuit. Since the left and right ends of the resistance wire are connected to a copper sheet, both ends can be regarded as grounded. Therefore, after the current is shunted at the contact point, the circuits on the left and right sides of the current shunting position can be regarded as parallel circuits. R1 and R2 represent the contact position and R C1 and R C2 The resistance between them, R3 is the internal resistance of the power generation sheet 2.

[0071] The touch speed is proportional to the voltage generated on the power generation sheet 2 within a certain range. The voltage generated on the power generation sheet 2 can be inferred from the detected left and right electrode voltage signals, thereby making a rough judgment on the touch speed. The power generation voltage U0 is affected by the contact speed and the device structure. When the device structure is determined, the power generation voltage U0 can be derived based on the measured two electrode voltages, thereby roughly deducing the size of the contact speed.

[0072] exist Figure 7 In the figure, the current flows out from the power supply and is shunted to both ends of the resistance line 8, which is equivalent to the current shunting through two resistors R1 and R2 of different sizes. The sizes of R1 and R2 are proportional to the distance from the touch point to the ground plate in their respective directions. Since both ends of the resistance line 8 are grounded, the voltages on R1 and R2 are U1 and U2 respectively. Since R1 and R2 are in parallel, U1=U2. The currents passing through R1 and R2 are I1 and I2 respectively. Assume that the voltage measured on the left electrode is V1, the voltage measured on the right electrode is V2, and the resistance of the resistance line 8 is 1M ohm per centimeter. The voltage of the left and right electrodes is measured on the resistance line 8 with a length of 1.5 cm, so the measured resistance is 1.5M ohm. The position of the contact point can be determined by the ratio of the measured voltages.

[0073] Specifically, the main working principle of the self-powered position sensor based on nano-triboelectricity is: when the touch layer 1 made of rubber is touched, because rubber has a stronger ability to attract electrons, the upper surface of the rubber carries a negative charge, and the finger in contact with it carries an opposite positive charge. Since negative charges are gathered on the upper surface of the rubber, positive charges are gathered on the lower surface of the rubber mold. The rubber mold is in contact with the power generation sheet 2. Under the action of electrostatic induction, the upper surface of the power generation sheet 2 made of copper sheet is accumulated with negative charges, and the lower surface of the copper sheet is accumulated with positive charges. When the pressure continues, the rubber of the contact layer 1 is deformed, and the copper sheet of the power generation layer 2 is in contact with the resistor line 8 to form a path. At this time, negative charges flow from the left grounding plate 501 and the right grounding plate 502 to the power generation sheet 2, and voltage and current are generated on the resistor line 8.

[0074] When the pressing is finished, the electrostatic induction between the touch layer 1 and the power generation sheet 2 also disappears, and the entire touch layer 1 returns to neutrality. The touch layer 1 is no longer affected by the positive charge carried by the finger. The negative charge of the upper layer and the positive charge of the lower layer will be mixed into electrical neutrality again. The power generation sheet 2 will not be affected by the positive charge under the touch layer 1. The positive charge previously received from the ground plate will return along the original path, and the electrons will flow back to the left ground plate 501 and the right ground plate 502, thereby generating a current in the opposite direction to the previous one. The current will flow from the two ground plates through the resistor line 8 to the power generation sheet 2 at the contact position. It is this contact electrification process that provides a signal source for the entire device without the need for an external power supply. By detecting the time difference between the positive voltage generated when contacting and the negative voltage generated when leaving, the contact time of the finger and the touch layer 1 can be determined.

[0075] The second aspect of the present invention is a method for identifying a self-powered position sensor based on nano-triboelectricity, which comprises the following steps:

[0076] S1. Build a self-powered position sensor;

[0077] S2, calculating perception parameters, the perception parameters including perception distance d, perception time t and perception speed v;

[0078] S3. Output the perception result of the self-powered position sensor in the current state according to the perception parameters calculated in S2.

[0079] The following is a further description of a self-powered position sensor based on nanotriboelectricity of the present invention in conjunction with an embodiment:

[0080] In this specific implementation, the specific structural dimensions of the parts in each component of the self-powered position sensor based on nano-triboelectricity are as follows:

[0081] A translucent rubber layer is used to make a touch layer 1 with a length of 400 mm, a width of 20 mm and a thickness of 0.3 mm. A copper sheet is used to make a power generation sheet 2 with a thickness of 0.01 mm, and both sides of the power generation sheet 2 are polished with sandpaper to increase the surface area. The polished copper sheet is cut into rectangular sheets with a length of 25 mm and a width of 16 mm to obtain 11 power generation sheets 2. The 11 power generation sheets 2 are arranged in sequence along the length direction of the touch layer 1 at a spacing of 2.5 mm, and the upper surface of the power generation sheet 2 is adhered to the lower bottom surface of the touch layer 1 by double-sided tape.

[0082] A rubber strip is used to make a support strip 3 with a length of 400 mm, a width of 5 mm and a thickness of 1 mm, and a PET film is used to make a bottom plate 4 with a length of 400 mm, a width of 20 mm and a thickness of 0.1 mm. PET is an insulating material and is not easy to gain or lose electrons, and can provide a good support and shielding effect for the device. The upper surface of the support strip 3 is bonded to the lower surface of the touch layer 1 by glue, and the lower surface of the support strip 3 is bonded to the upper surface of the bottom plate 4 by glue.

[0083] Use copper sheets to make left and right grounding plates 501 and 502 with a length of 30 mm, a width of 20 mm and a thickness of 0.1 mm respectively. Glue the prepared left grounding plate 501 to the leftmost part of the upper surface of the base plate 4, in the middle of the two support bars 3, and press the left end of the resistance wire 8 for about 10 mm, and the two are connected to form a passage state. Glue the prepared right grounding plate 502 to the rightmost part of the upper surface of the base plate 4, in the middle of the two support bars 3, and press the right end of the resistance wire for about 10 mm, and the two are connected to form a passage state.

[0084] Take iron sheets to make a first left electrode 601, a second left electrode 602, a third left electrode 603 and a fourth left electrode 604 with a length of 10 mm, a width of 1 mm and a thickness of 0.1 mm respectively; set the spacing between the manufactured first left electrode 601 and the second left electrode 602 to 15 mm, and set the spacing between the first left electrode 601 and the left grounding plate 501 to 5 mm; after adjustment, glue the first left electrode 601 and the second left electrode 602 to the bottom plate 4 by glue, and press the resistor line 8 horizontally to form a passage; set the spacing between the manufactured third left electrode 603 and the fourth left electrode 604 to 15 mm, and set the spacing between the fourth left electrode 604 and the right grounding plate 502 to 5 mm; after adjustment, glue the third left electrode 603 and the fourth left electrode 604 to the bottom plate 4 by glue, and press the resistor line 8 horizontally to form a passage.

[0085] Copper wire is used to make a first copper wire conductor 701, a second copper wire conductor 702, a third copper wire conductor 703 and a fourth copper wire conductor 704 with a diameter of 0.01 mm. The first copper wire conductor 701, the second copper wire conductor 702, the third copper wire conductor 703 and the fourth copper wire conductor 704 are respectively connected to the first left electrode 601, the second left electrode 602, the third left electrode 603 and the fourth left electrode 604 by welding, and then led to the acquisition equipment for data acquisition.

[0086] Take a resistor wire 8 with a length of 360 mm, cut it, and stick the paper surface to the center position of the width of the upper surface of the bottom plate 4 with glue.

[0087] Since the selected materials are all flexible materials, the self-powered position sensor based on nanotriboelectricity is put on the wrist in the form of a bracelet for testing. It looks very natural when worn on the hand without causing discomfort. The sensor has only two interfaces, avoiding complicated line connections. Since the sensor can be self-powered, there is no need to add a battery to power it, which avoids the inconvenience caused by repeated battery replacement and saves more space.

[0088] The touch layer 1 above the resistance wire 8 in the manufactured self-powered position sensor based on nano-triboelectricity is divided into five parts from left to right, and a contact point is set in the middle of each part. In fact, the sensor can detect the contact situation at any position above the power generation sheet 2. The five contact positions are: contact position No. 1, contact position No. 2, contact position No. 3, contact position No. 4 and contact position No. 5.

[0089] Press the five contact points on the device from left to right. When contact position 1 is pressed, the voltage comparison between the left electrode and the right electrode is about 5:1; when contact position 2 is pressed, the voltage comparison between the left electrode and the right electrode is about 2:1; when contact position 3 is pressed, the voltage comparison between the left electrode and the right electrode is about 1:1; when contact position 4 is pressed, the voltage comparison between the left electrode and the right electrode is about 1:2; when contact position 5 is pressed, the voltage comparison between the left electrode and the right electrode is about 1:5. Figures 8a to 12b As shown, the experimental results are basically consistent with the expected data.

[0090] The ratios of the left interface detection voltage to the right interface detection voltage are 5:1, 2:1, 1:1, 1:2, and 1:5, respectively. These five position signals can be used as the body's response to external stimuli, for prostheses to sense external environments and other working conditions, and can also be used as controllers for human-computer interaction. The five positions can be used as five switches to control external machines or computer simulation models.

[0091] according to Figures 8a to 12b The measured voltage shown in the figure shows that the time between the positive and negative voltages is the time the finger is in contact with the touch layer. According to the formula

[0092] and The generated voltage U0 can be obtained, and the touch speed can be roughly judged based on U0 and the structure of the device, including the size and thickness of the power generation sheet, the thickness of the support strip and other factors.

[0093] According to the above-mentioned specific embodiments, the present invention has the following features: simultaneously sensing multiple external stimuli, such as: the position of touch, the time of touch and the speed of touch, sensing the surrounding environment and avoiding damage as much as possible. Multifunctional sensing is achieved through dual interfaces, and higher resolution and multifunctional sensing are achieved. It also has a simple interconnection and refined structure, which can avoid interference in signal transmission, bringing convenience to the reading circuit and signal processing. It has the characteristics of flexibility and flexibility, can realize multifunctional applications, and improve the environmental adaptability of the sensing device. It can work without any external power supply, avoiding the shortcomings of traditional battery-based bionic sensing devices such as short life, regular charging, frequent replacement, and high risk of environmental pollution. Using two interfaces for signal collection can realize multi-stimulus position recognition and avoid redundant line connections. It also avoids the problem of signal crosstalk caused by complex lines.

[0094] The embodiments described above are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A self-powered position sensor based on nano-triboelectricity, comprising a power generation component, a support component and a conduction component, wherein the power generation component is connected to a first mounting end of the support component, and the conduction component is connected to a second mounting end of the support component, characterized in that: The power generation component comprises a touch layer and power generation sheets, and the power generation sheets are evenly distributed along the length direction of the touch layer; the support component comprises a support bar and a base, and the support bars are symmetrically distributed on both sides of the base and fixedly connected to both sides of the base; the conduction component comprises a ground plate, a left electrode, a right electrode, a copper wire conductor and a resistance wire, the first mounting end and the second mounting end of the resistance wire are respectively fixedly connected to the left ground plate and the right ground plate, the first left electrode and the second left electrode are located on the side of the resistance wire close to the left ground plate, the first end of the first left electrode and the second left electrode are fixedly connected to the third mounting end and the fourth mounting end of the resistance wire, the first right electrode and the second right electrode are located on the side of the resistance wire close to the right ground plate, the first end of the first right electrode and the second right electrode are fixedly connected to the fifth mounting end and the sixth mounting end of the resistance wire, the second end of the first left electrode and the second left electrode are respectively connected to the first copper wire conductor and the second copper wire conductor, and the second end of the first right electrode and the second right electrode are respectively connected to the third copper wire conductor and the fourth copper wire conductor; The sensing distance L1 between the first end and the second end of the generator sheet to be triggered and the left grounding plate and the sensing distance L2 between the right grounding plate are determined by the following expressions: Where L is the length of the resistor wire, V1 represents R C1 The induced voltage across the two ends, V2 represents R C2 The induced voltage across R C1 The resistor R is the 15mm wide resistor at the left end of the resistor line. C2 The resistor is 15mm wide at the right end of the resistor wire.

2. The nano-triboelectric self-powered position sensor according to claim 1, characterized in that: The touch layer, the support bar and the base have the same length.

3. The nano-triboelectric self-powered position sensor according to claim 1, characterized in that: The distance between the first left electrode and the second left electrode is 15 mm, and the distance between the first right electrode and the second right electrode is 15 mm.

4. The nano-triboelectric self-powered position sensor according to claim 1, characterized in that: The expression of the voltage V generated by the power generation component is as follows: In the formula, ε o is the dielectric constant of the touch layer, ε r is the relative dielectric constant, σ o is the friction charge density of the touch layer, d is the sensing distance, Δσ is the transfer charge density on the ground plate, x(t) is the distance between the generator and the resistor wire, and t is the sensing time.

5. The nano-triboelectric self-powered position sensor according to claim 1, characterized in that: The resistance wire of the conductive component is made of a carbon nanotube solution with a content of 10%.

6. The nano-triboelectric self-powered position sensor according to claim 1, characterized in that: The power generation component is equivalent to a power supply and a resistor R3. The 15mm wide resistor at the left end of the resistor line is set as R C1 , the 15mm wide resistor at the right end of the resistor line is set as R C2 , and in R C1 and R C2 Connect a voltmeter in parallel at both ends of the touch power generation component from the touch layer to the resistor R C1 The resistance between them is R1, and the resistance between the touch layer in the touch power generation component and the resistor R C2 The resistor between R1 and R C1 The left current is composed of R2 and R C2 An ammeter is connected in series between the right currents respectively, and the left current and the right current are connected in parallel and then connected in series with the two ends of the power generation component to form a parallel circuit. Therefore, when the touch layer in the power generation component is touched, self-power is supplied. The specific expression of the voltage U0 generated by the power generation sheet is as follows: Where U 并 is the voltage of the parallel circuit, is the resistance of the parallel circuit, R1 and R2 represent the contact position and R C1 and R C2 The resistance between them, R3 is the internal resistance of the generator.

7. An identification method of a nano-triboelectric self-powered position sensor according to any one of claims 1 to 6, characterized in that: It includes the following steps: S1. Build a self-powered position sensor; S2. Calculate perception parameters, wherein the perception parameters include perception distance d, perception time t and perception speed v; S3. According to the sensing parameters calculated in S2, output the sensing result of the self-powered position sensor in the current state.

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