Gradient segmented flag wind sensor with self-powered warning function

Abstract

The invention discloses a gradient segmented flag wind sensor with a self-powered warning function. The gradient segmented flag wind sensor comprises a first sensing structure and a second sensing structure which are oppositely arranged, the first sensing structure comprises a substrate film I (1) and an electrode film I (2) which are stacked and pasted; wherein the substrate film I (1) has different thicknesses in the horizontal direction; the second sensing structure comprises a friction layer film (3), an electrode film II (4) and a substrate film II (5) which are sequentially stacked and adhered; wherein the friction layer film is opposite to the electrode film I (2) of the first sensing structure; and the substrate film II (5) has different thicknesses in the horizontal direction. According to the invention, high-precision wind speed sensing can be realized under conventional conditions, and a self-powered illumination early warning mechanism can be automatically triggered for wind power of level 5 and above under abnormal conditions such as sudden power failure.

Description

Technical Field

[0001] This invention relates to the field of sensors, specifically a gradient segmented flag wind sensor with self-powered warning. Background Technology

[0002] Currently, despite significant advancements in wind sensing technology, most traditional technologies, such as thermistors, fiber optics, piezoelectric and piezoresistive sensors, still rely on batteries or external power sources and typically require frequent maintenance, making them unsuitable for continuous operation during power outages.

[0003] The advent of triboelectric nanogenerator (TGN) technology has opened up a promising path for self-powered wind sensing. In recent years, this technology has been widely applied in numerous fields. Its working principle is based on the coupling effect of triboelectric charging and electrostatic induction, converting mechanical motion into electrical energy through surface charge transfer and changes in the electrostatic field. When applied to wind energy harvesting, airflow causes relative motion between the triboelectric layer and the electrodes, generating usable electrical output. This characteristic allows for real-time sensing without batteries or external power sources. This unique energy harvesting capability makes TGNs ideal for self-powered wind speed monitoring, especially in environments with unstable power supplies. Wind energy devices based on TGNs are generally classified into two main categories: rotary and flutter. Rotary designs often require rigid structures and complex mechanical components, making them less sensitive to low-speed or irregular airflow. In contrast, flutter designs have a lightweight and flexible structure, especially flexible flutter designs, which offer significant advantages. They can adapt well to varying airflow patterns, achieving efficient energy conversion even under low-frequency wind conditions common in urban and natural environments.

[0004] Common flexible vibrating nanogenerator devices typically include, for example: Figure 1 What is shown in image a is a flag shape, whose structure is typically a layered form of stacked thin sheets of material (such as...). Figure 1 (b) However, most of these designs currently focus on one function of wind energy harvesting or wind speed detection, and few can achieve both functions simultaneously. Furthermore, in many cases, improving the sensitivity of wind speed sensors comes at the cost of reduced output power, making self-powered wind speed sensing and early warning impossible. Summary of the Invention

[0005] The purpose of this invention is to provide a flag wind sensor with self-powered warning, which converts wind energy into electrical energy to power an LED series array and an external load.

[0006] When the wind force reaches level 5 or above, the LED series array remains illuminated.

[0007] The gradient segmented flag wind sensor includes a first sensing structure and a second sensing structure arranged opposite to each other.

[0008] The first sensing structure includes a substrate film I and an electrode film I stacked together.

[0009] The second sensing structure includes a friction layer film, an electrode film II, and a substrate film II, which are stacked and bonded together in sequence. The friction layer film is opposite to the electrode film I of the first sensing structure.

[0010] Electrode film I and electrode film II are respectively connected to the two ends of the LED series array.

[0011] A gradient segmented flag wind sensor with self-powered warning converts wind energy into electrical energy to power an LED series array and an external load.

[0012] When the wind force reaches level 5 or above, the LED series array remains illuminated.

[0013] The gradient segmented flag wind sensor includes a first sensing structure and a second sensing structure arranged opposite to each other.

[0014] The first sensing structure includes a substrate film I and an electrode film I stacked together. The substrate film I has a different thickness in the horizontal direction.

[0015] The second sensing structure includes a friction layer film, an electrode film II, and a substrate film II, which are stacked and bonded together in sequence. The friction layer film is opposite to the electrode film I of the first sensing structure. The substrate film II has a different thickness in the horizontal direction.

[0016] Electrode film I and electrode film II are respectively connected to the two ends of the LED series array.

[0017] Furthermore, the substrate film I is divided into three segments with progressively decreasing thickness in the horizontal direction.

[0018] Furthermore, when the wind speed is less than 4.4 m / s, the thinnest film dominates the voltage output.

[0019] When the wind speed range is 4.4m / s-6.4m / s, the medium-thickness film dominates the voltage output.

[0020] When the wind speed range is greater than 6.4 m / s, the thickest film dominates the voltage output.

[0021] Furthermore, the friction layer film is made of insulating material.

[0022] Furthermore, the working process of the flag wind sensor is as follows: under the action of wind, the friction layer film comes into contact with electrode film I and electrode film II. The triboelectric effect causes the charge to transfer on the contact surface, generating equal amounts of charges but opposite charges.

[0023] During the periodic contact and separation of the first and second sensing structures, the electric field drives the flow of charge, continuously generating an alternating current signal, thereby providing a drive for the external load.

[0024] Furthermore, the periodic contact and separation process of the first and second sensing structures is as follows:

[0025] When the first and second sensing structures begin to separate, the electric field formed between the contact surfaces drives the charge to flow from the upper electrode to the lower electrode, thereby generating an output current.

[0026] When the first and second sensing structures reach maximum separation, the flag wind sensor is in electrostatic equilibrium.

[0027] When the first and second sensing structures come into contact again, the potential difference formed by the triboelectric charge decreases, and the charge flows in the opposite direction, thereby generating a reverse current.

[0028] Furthermore, when the wind speed is less than 5.8 m / s, the LED series array remains off due to insufficient starting voltage.

[0029] When the wind speed is 5.8 m / s ～ At speeds between 6.5 m / s, the LED series array flickers intermittently.

[0030] When the wind speed is greater than 6.5 m / s, the LED series array includes a bright state.

[0031] Furthermore, the flag wind sensor and the wind vane are fixed on the same bearing, and the flag wind sensor and the wind vane are fixed together.

[0032] As the wind vane rotates with the wind direction, the flag wind sensor rotates accordingly, responding to the dynamic wind vector by rotating omnidirectionally. (That is, the wind blows the vane to rotate, and the rotation of the wind vane causes the flag wind sensor to rotate.)

[0033] Furthermore, Al is selected as the material for electrode film I and electrode film II.

[0034] Furthermore, the substrate film I comprises multiple layers of film, each layer having the same area and independently set thickness.

[0035] The technical effects of this invention are undeniable. This invention can not only achieve high-precision wind speed sensing under normal conditions, but also automatically trigger a self-powered lighting early warning mechanism for winds of level 5 and above in abnormal situations such as sudden power outages, providing an innovative solution for preventing natural disaster risks. Attached Figure Description

[0036] Figure 1 This is a common structure for flexible vibration devices;

[0037] Figure 2 Design of a flag wind sensor structure;

[0038] Figure 3 For the working principle;

[0039] Figure 4 Simulate the potential distribution for COMSOL;

[0040] Figure 5 This is a diagram illustrating the actual motion process of the object.

[0041] Figure 6 Output power and durability testing of single-segment devices;

[0042] Figure 7 This is a display of the wind direction device and a test diagram of the wind direction output;

[0043] Figure 8 Multi-segment devices are used for wind speed sensing;

[0044] Figure 9 This is a demonstration of self-powered early warning and precision sensing applications. Detailed Implementation

[0045] The present invention will be further described below with reference to embodiments, but it should not be construed that the scope of the present invention is limited to the following embodiments. Various substitutions and modifications made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention should be included within the scope of protection of the present invention.

[0046] Example 1:

[0047] See Figures 2 to 9 A flag wind sensor with self-powered warning, which converts wind energy into electrical energy to power an LED series array and external loads.

[0048] When the wind force reaches level 5 or above, the LED series array remains illuminated.

[0049] The gradient segmented flag wind sensor includes a first sensing structure and a second sensing structure arranged opposite to each other.

[0050] The first sensing structure includes a substrate film I1 and an electrode film I2 that are stacked and bonded together.

[0051] The second sensing structure includes a friction layer film 3, an electrode film II4, and a substrate film II5, which are stacked and bonded together in sequence. The friction layer film is opposite to the electrode film I2 of the first sensing structure. Electrode films I2 and II4 are electrically connected to both ends of the LED series array, respectively. The placement of the LED series array is determined by actual requirements.

[0052] Example 2:

[0053] A flag wind sensor with self-powered warning, the technical content is the same as in Embodiment 1, except that the friction layer film 3 is made of insulating material.

[0054] Example 3:

[0055] A flag wind sensor with self-powered warning, the technical content is the same as any one of embodiments 1-2. Further, the working process of the flag wind sensor is as follows: under the action of wind, the friction layer film 3 comes into contact with the electrode film I2 and the electrode film II4. The triboelectric effect causes the charge to transfer on the contact surface, generating an equal number of charges but opposite charges.

[0056] During the periodic contact and separation of the first and second sensing structures, the electric field drives the flow of charge, continuously generating an alternating current signal, thereby providing a drive for the external load. The external load is a low-power device such as a thermometer or hygrometer.

[0057] Example 4:

[0058] A flag wind sensor with self-powered warning, the technical content of which is the same as any one of embodiments 1-3, further wherein the periodic contact and separation process of the first sensing structure and the second sensing structure is as follows:

[0059] When the first and second sensing structures begin to separate, the electric field formed between the contact surfaces drives the charge to flow from the upper electrode to the lower electrode, thereby generating an output current.

[0060] When the first and second sensing structures reach maximum separation, the flag wind sensor is in electrostatic equilibrium.

[0061] When the first and second sensing structures come into contact again, the potential difference formed by the triboelectric charge decreases, and the charge flows in the opposite direction, thereby generating a reverse current.

[0062] Example 5:

[0063] A flag wind sensor with self-powered warning, the technical content of which is the same as any one of embodiments 1-4, further wherein when the wind speed is less than 5.8 m / s, the LED series array remains off due to insufficient start-up voltage.

[0064] When the wind speed is 5.8 m / s ～ At speeds between 6.5 m / s, the LED series array flickers intermittently.

[0065] When the wind speed is greater than ～ At 6.5 m / s, the LED series array includes the bright state.

[0066] Example 6:

[0067] A flag wind sensor with self-powered warning, the technical content of which is the same as any one of embodiments 1-5, further wherein the flag wind sensor and the wind vane are fixed on the same bearing and the flag wind sensor and the wind vane are fixed together.

[0068] As the wind vane rotates with the wind direction, the flag wind sensor rotates accordingly, responding to the dynamic wind vector by rotating omnidirectionally. (That is, the wind blows the vane to rotate, and the rotation of the wind vane causes the flag wind sensor to rotate.)

[0069] Example 7:

[0070] A flag wind sensor with self-powered warning, the technical content of which is the same as any one of embodiments 1-6, further wherein the materials of electrode film I2 and electrode film II4 are selected from Al.

[0071] Example 8:

[0072] See Figures 2 to 9 A gradient segmented flag wind sensor with self-powered warning converts wind energy into electrical energy to power an LED series array and external loads.

[0073] When the wind force reaches level 5 or above, the LED series array remains illuminated.

[0074] The gradient segmented flag wind sensor includes a first sensing structure and a second sensing structure arranged opposite to each other.

[0075] The first sensing structure includes a substrate film I1 and an electrode film I2 stacked together. The substrate film I1 has a different thickness in the horizontal direction.

[0076] The second sensing structure includes a friction layer film 3, an electrode film II4, and a substrate film II5, which are stacked and bonded together in sequence. The friction layer film is opposite to the electrode film I2 of the first sensing structure. The substrate film II5 has a different thickness in the horizontal direction.

[0077] Electrode film I2 and electrode film II4 are electrically connected to both ends of the LED series array, respectively. The placement of the LED series array is determined by actual requirements.

[0078] Example 9:

[0079] A gradient segmented flag wind sensor with self-powered warning, the technical content is the same as in Embodiment 8, further wherein the substrate thin film I1 is divided into three thin films with progressively decreasing thickness in the horizontal direction.

[0080] Example 10:

[0081] A gradient segmented flag wind sensor with self-powered warning, the technical content of which is the same as any one of embodiments 8-9, further wherein when the wind speed is <4.4m / s, the thinnest film dominates the voltage output.

[0082] When the wind speed range is 4.4m / s-6.4m / s, the medium-thickness film dominates the voltage output.

[0083] When the wind speed range is greater than 6.4 m / s, the thickest film dominates the voltage output.

[0084] Example 11:

[0085] A gradient segmented flag wind sensor with self-powered warning, the technical content of which is the same as any one of embodiments 8-10, further wherein the friction layer film 3 is made of insulating material.

[0086] Example 12:

[0087] A gradient segmented flag wind sensor with self-powered warning, the technical content is the same as any one of embodiments 8-11. Further, the working process of the flag wind sensor is as follows: under the action of wind, the friction layer film 3 comes into contact with the electrode film I2 and the electrode film II4. The triboelectric effect causes the charge to transfer on the contact surface, generating an equal number of charges but opposite charges.

[0088] During the periodic contact and separation of the first and second sensing structures, the electric field drives the flow of charge, continuously generating an alternating current signal, thereby providing a drive for the external load. The external load is a low-power device such as a thermometer or hygrometer.

[0089] Example 13:

[0090] A gradient segmented flag wind sensor with self-powered warning, the technical content of which is the same as any one of embodiments 8-12, further wherein the periodic contact and separation process of the first sensing structure and the second sensing structure is as follows:

[0091] When the first and second sensing structures begin to separate, the electric field formed between the contact surfaces drives the charge to flow from the upper electrode to the lower electrode, thereby generating an output current.

[0092] When the first and second sensing structures reach maximum separation, the flag wind sensor is in electrostatic equilibrium.

[0093] When the first and second sensing structures come into contact again, the potential difference formed by the triboelectric charge decreases, and the charge flows in the opposite direction, thereby generating a reverse current.

[0094] Example 14:

[0095] A gradient segmented flag wind sensor with self-powered warning, the technical content is the same as any one of embodiments 8-13, further wherein when the wind speed is less than 5.8m / s, the LED series array remains off due to insufficient start-up voltage.

[0096] When the wind speed is 5.8 m / s ～ At speeds between 6.5 m / s, the LED series array flickers intermittently.

[0097] When the wind speed is greater than ～ At 6.5 m / s, the LED series array includes the bright state.

[0098] Example 15:

[0099] A gradient segmented flag wind sensor with self-powered warning, the technical content is the same as any one of embodiments 8-14, further wherein the flag wind sensor and the wind vane are fixed on the same bearing, and the flag wind sensor and the wind vane are fixed together.

[0100] As the wind vane rotates with the wind direction, the flag wind sensor rotates accordingly, responding to the dynamic wind vector by rotating omnidirectionally. (That is, the wind blows the vane to rotate, and the rotation of the wind vane causes the flag wind sensor to rotate.)

[0101] Example 16:

[0102] A gradient segmented flag wind sensor with self-powered warning, the technical content is the same as any one of embodiments 8-15, further wherein the electrode film I2 and electrode film II4 are made of Al.

[0103] Example 17:

[0104] A gradient segmented flag wind sensor with self-powered warning, the technical content is the same as any one of embodiments 8-16, further wherein the substrate thin film I1 includes multiple thin films, each with the same area and independently set thickness.

[0105] Example 18:

[0106] A gradient segmented flag wind sensor with self-powered warning, the technical content of which is the same as any one of embodiments 8-17, further comprising two thin films of the same area, wherein the layer in contact with the outside is denoted as layer A, and the thin film located below layer A is denoted as layer B. The thickness of layer A is the same as the thickness of the first segment of layer B. For example, the thickness of segment A is 50 μm throughout, while the thickness of segment B is only 50 μm in the first segment.

[0107] Example 19:

[0108] A gradient segmented flag wind sensor with self-powered warning, the details of which are as follows:

[0109] Figure 2 The designed structure is available in two types: single-segment and multi-segment, each designed for different applications. The single-segment type is primarily used for self-powered wind speed warnings and is expected to power the sensor. The multi-segment type, on the other hand, achieves accurate wind speed sensing through its sophisticated structural design. For example... Figure 2 As shown in Figure a, the single-segment device is composed of two substrate films (PET), two electrode films (Al), and a friction layer (PTFE) film bonded together, and its physical appearance resembles a flexible flag. This configuration enables stable vibration of the airflow, thereby effectively converting wind energy into electrical energy. Figure 2 The "b" design is for multi-segment devices. Unlike the single-segment version, it uses PET films of varying thicknesses as the substrate, giving each segment a different weight and thickness. This hierarchical design allows the multi-segment device to exhibit a highly sensitive response to wind speed, physically resembling segmented flags. To achieve wind direction adaptability, the system is equipped with a wind vane made of acrylic material, such as... Figure 2 As shown in Figure c, the direction of the weather vane can be adjusted according to its rotation, ensuring effective operation under any wind conditions. Figure 2 As shown in Figure d, the three components work together to form a complete direction-adaptive, self-powered wind speed warning and sensing system. This system not only possesses accurate wind speed sensing capabilities but also integrates a self-powered warning function, enabling real-time monitoring and warning of wind speed without an external power source, significantly improving its applicability in complex environments.

[0110] Figure 3 The working principle of the device's movement process is as follows: When the PTFE friction layer and the aluminum friction layer come into contact, the triboelectric effect causes charge to transfer between the two contact surfaces, thereby generating equal amounts of charge but opposite charges (such as...). Figure 3 i). Due to PTFE's excellent insulation properties, these charges can remain on its surface for a long time. When the two components begin to separate, the electric field formed between the contact surfaces drives electrons to flow from the upper electrode to the lower electrode, thereby generating an output current (e.g., ...). Figure 3 (as shown in ii). Figure 3 iii. When the two flags reach their maximum separation, the entire system is in electrostatic equilibrium, and the current in the external circuit drops to zero. Figure 3 IV demonstrates that when the components begin to contact again, the potential difference created by triboelectric charge gradually decreases, causing electrons to flow in the opposite direction, thus generating a reverse current. Eventually, the components return to full contact, and the device returns to its original state. Figure 3 The initial state is shown in figure i. This periodic contact and separation process continuously generates AC signals, thereby driving the external load.

[0111] Figure 4 This figure shows the potential distribution of four typical deformation modes under open-circuit conditions, accurately simulated using COMSOL finite element software. The results presented are consistent with... Figure 3 The charge transfer processes in the samples are highly consistent, which further deepens the systematic understanding of their working mechanism. Figure 5 The physical motion process shown is Figure 3 The contact separation process described in detail is completely consistent with that described in the paper, which verifies the accuracy of the theoretical model from the perspective of actual motion.

[0112] Figure 6 The measured performance data of the single-segment device are presented. Through optimization of the device's aspect ratio and the spacing between the two flags, the device achieves a significant output power of 3.23mW under optimal operating conditions, corresponding to an optimal load of 32.9MΩ, with a calculated power density of 215mW / m². Figure 6 As shown in Figure a, this data directly demonstrates the device's high energy conversion efficiency and excellent self-powered performance. Furthermore, at a wind speed of 6.5 m / s, the average flutter frequency of the device, measured based on peak data analysis, is 6 Hz; during a continuous test lasting 4000 seconds, the device completed over 20,000 contact cycles, as shown in Figure a. Figure 6 As shown in b, the charge waveform remained highly stable throughout the test. This result fully demonstrates the device's excellent durability and operational stability during long-term operation.

[0113] Figure 7 The multi-directional output performance comparison of the device is demonstrated. To overcome the limitations of existing similar devices that can typically only adapt to a single wind direction and whose output is easily affected by changes in wind direction, a modular adaptive component consisting of a bearing and a wind vane is introduced into the design. Figure 7 As shown in Figure a, the wind vane and the device are fixed on the same bearing. When the wind vane rotates with the wind direction, the device can rotate accordingly, thus responding to the dynamic wind vector and rotating omnidirectionally, ensuring consistent output under any wind direction. Experimental results are as follows. Figure 7 As shown in b, the device maintains a highly stable charge output under eight typical wind directions. This adaptive adjustment capability to wind direction effectively ensures that the output performance is not affected by changes in wind direction.

[0114] Figure 8The sensing performance data of the multi-segment device is presented. By testing the wind speed-voltage curves of devices with segments 1, 2, 3, and 4 (each segment proportionally divided) at the same wind speed, it was found that the wind speed-voltage curve of the 3-segment device exhibits the best linearity, and its sensing sensitivity and detection stability are significantly better than other segmented structures. The output voltage fitting curve of the three-segment device is shown below. Figure 8 a) It exhibits typical dual-frequency response characteristics: In the low wind speed range (2.4-4.4 m / s), the thinnest segment (25 μm substrate thickness), with its high flexibility, low weight, and high natural frequency, first generates significant contact separation vibration, dominating the voltage output; when the wind speed increases to 4.4-6.4 m / s, the middle segment (38 μm substrate thickness) enters a resonant state, with its vibration amplitude and charge transfer efficiency significantly improved, becoming the main contributor to the sensing signal; while under strong wind conditions above 6.4 m / s, the thickest segment (50 μm) begins to dominate the response. This segmented response mechanism allows the three-segment device to optimize sensitivity and measurement range in the low to medium wind speed region. Regarding the durability issues that may arise from excessively thin materials, Figure 8 The verification results of b show that after the device was continuously tested for more than 20,000 cycles (more than 60,000 cycles in total) at wind speeds of 3.6 m / s, 4.8 m / s and 5.2 m / s, the voltage waveform did not show significant attenuation, indicating that the structure has achieved a significant enhancement in mechanical durability and output stability.

[0115] Figure 9 An application example of this device system is shown. Figure 9 The device demonstrates its self-powered warning function. When the wind speed is below 5.8 m / s, the series array of 434 LEDs remains off due to insufficient starting voltage; when the wind speed reaches 6 m / s, the LEDs begin to flicker weakly and intermittently; and when the wind speed exceeds 6.5 m / s, their brightness significantly increases, sufficient to provide a lighting warning. This indicates that the device can provide a self-powered lighting warning when the wind force reaches level 5. Figure 9 Demonstration b showcased a sensor covering seven wind speeds, with measurements differing from commercial sensor readings by no more than 0.1 m / s, demonstrating its high-precision sensing potential. In summary, this device not only achieves high-precision wind speed sensing under normal conditions but also automatically triggers a self-powered lighting early warning mechanism for winds of level 5 and above in abnormal situations such as sudden power outages, providing an innovative solution for mitigating natural disaster risks.

Claims

1. A flag wind sensor with self-powered warning, characterized by: The flag-shaped wind sensor converts wind energy into electric energy to power the LED series array and external load; When the wind force reaches 5 or above, the LED series array remains in the lighting state; The gradient segmented flag-shaped wind sensor comprises a first sensing structure and a second sensing structure arranged oppositely; The first sensing structure comprises a base film I (1) and an electrode film I (2) stacked and pasted; The second sensing structure comprises a friction layer film (3), an electrode film II (4) and a base film II (5) stacked and pasted in sequence; The friction layer film is opposite to the electrode film I (2) of the first sensing structure; The electrode film I (2) and the electrode film II (4) are connected to two ends of the LED series array respectively.

2. A gradient segmented flag wind sensor with self-powered warning, characterized by: The gradient segmented flag-shaped wind sensor converts wind energy into electric energy to power the LED series array and external load; When the wind force reaches 5 or above, the LED series array remains in the lighting state; The gradient segmented flag-shaped wind sensor comprises a first sensing structure and a second sensing structure arranged oppositely; The first sensing structure comprises a base film I (1) and an electrode film I (2) stacked and pasted; wherein the base film I (1) has different thicknesses in the horizontal direction; The second sensing structure comprises a friction layer film (3), an electrode film II (4) and a base film II (5) stacked and pasted in sequence; The friction layer film is opposite to the electrode film I (2) of the first sensing structure; the base film II (5) has different thicknesses in the horizontal direction; The electrode film I (2) and the electrode film II (4) are connected to two ends of the LED series array respectively.

3. The flag wind sensor of claim 2, wherein: The base film I (1) is divided into three films with decreasing thicknesses in the horizontal direction.

4. The flag wind sensor of claim 2, wherein: When the wind speed is less than 4.4 m / s, the thinnest film dominates the voltage output; When the wind speed ranges from 4.4 m / s to 6.4 m / s, the film with the intermediate thickness dominates the voltage output; When the wind speed is greater than 6.4 m / s, the thickest film dominates the voltage output.

5. The flagpole wind sensor of claim 1 or 2, wherein: The friction layer film (3) is made of insulating material; The electrode film I (2) and the electrode film II (4) are made of Al.

6. The flagpole wind sensor of claim 1 or 2, wherein, The working process of the flag-shaped wind sensor is as follows: under the action of wind force, the friction layer film (3) contacts with the electrode film I (2) and the electrode film II (4), the triboelectric effect promotes the transfer of electric charges on the contact surface, and the charges with equal quantity but opposite electric properties are generated; During the periodic contact and separation of the first sensing structure and the second sensing structure, the electric field drives the flow of electric charges, continuously generating alternating current signals to provide driving for the external load.

7. The flag wind sensor of claim 6, wherein: The periodic contact and separation process of the first sensing structure and the second sensing structure is as follows: When the first sensing structure and the second sensing structure start to separate, the electric field formed between the contact surfaces drives the flow of electric charges from the upper electrode to the lower electrode, thereby generating output current; When the first sensing structure and the second sensing structure reach the maximum separation state, the flag-shaped wind sensor is in the state of electrostatic equilibrium; When the first sensing structure and the second sensing structure contact again, the potential difference formed by the triboelectric charges decreases, and the electric charges flow reversely, thereby generating reverse current.

8. The flagpole wind sensor of claim 1 or 2, wherein: When the wind speed is less than 5.8 m / s, the LED series array remains unlit due to insufficient starting voltage. When the wind speed is between 5.8 m / s ～ 6.5 m / s, the LED series array intermittently flashes; When the wind speed is greater than ～ 6.5 m / s, the LED series array includes a bright state.

9. The flagpole wind sensor of claim 1 or 2, wherein: The flag wind sensor and the wind vane are fixed on the same bearing, and the flag wind sensor and the wind vane are fixed together. When the wind vane rotates with the wind direction, the flag wind sensor rotates with it, and responds to the dynamic wind vector for omnidirectional rotation.

10. The flag wind sensor of claim 2, wherein: The base film I (1) comprises a plurality of layers of film, and the area of each layer of film is the same, and the thickness is independently set.

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