CN113687097B - Passive wireless wind speed sensor based on flexible inductance structure - Google Patents

Abstract

The invention discloses a passive wireless wind speed sensor based on a flexible inductance structure, which comprises a reading end and a sensor end, wherein the reading end is connected with the sensor end; the sensor end comprises a first plane spiral inductor and a second plane spiral inductor; the first planar spiral inductor is a flexible planar spiral inductor and is fixed on the surface of a flexible substrate deformed by wind; the substrate where the second planar spiral inductor is located is not deformed when being windy, and the first planar spiral inductor and the second planar spiral inductor form a series loop; the reading end comprises a third plane spiral inductor, the third plane spiral inductor and the second plane spiral inductor keep near magnetic field coupling, and the output end of the third plane spiral inductor is connected with the LCR tester. The invention realizes the energy information wireless transmission and the wind speed measurement based on the mutual inductance circuit principle, and solves the technical problem that the existing wind speed sensor cannot meet the application requirements of small-sized, high-energy-efficiency, flexible applicable environment and the like in the Internet of things technology due to the requirement of batteries and wiring.

Description

A passive wireless wind speed sensor based on flexible inductive structure

technical field

The invention relates to a passive wireless wind speed sensor.

Background technique

The Internet of Things is developing rapidly, and sensors are an important part of it. Typically, sensor nodes are battery powered and wired, which hinders deployment in some inaccessible or hard-to-reach places, and frequent battery replacement also increases maintenance costs, and batteries and wiring increase area, which is not conducive to Achieve high energy efficiency and high density distribution. Passive wireless sensors are capable of continuous real-time detection, require the sensor to be powered remotely, and take up less space in some harsh and sealed environments where wiring is difficult.

Wind speed sensors have been widely used for decades, and so far, various wind sensors using different principles have been extensively studied based on microelectromechanical systems (MEMS) technology. As a device for measuring wind speed, the wind speed sensor is required to be small and light, easy to carry and assemble, and can easily and effectively obtain wind speed information. Mainly used in meteorology, agriculture, shipbuilding, industry and environmental protection and other fields, it is required to be used outdoors for a long time.

SUMMARY OF THE INVENTION

Purpose of the invention: In view of the above prior art, a passive wireless wind speed sensor based on a flexible inductive structure is proposed to solve the problem that the existing wind speed sensor cannot meet the miniaturization of the Internet of Things technology due to the need for batteries and wiring.

Technical solution: a passive wireless wind speed sensor based on a flexible inductance structure, comprising a reading end and a sensor end; the sensor end includes a first plane spiral inductor and a second plane spiral inductor; the first plane spiral inductor is a flexible plane The spiral inductor is fixed on the surface of the flexible substrate deformed by the wind; the substrate where the second planar spiral inductor is located is not deformed by the wind, and the first planar spiral inductor and the second planar spiral inductor form a series loop; the reading end includes A third planar spiral inductor, the third planar spiral inductor and the second planar spiral inductor maintain near-magnetic field coupling, and the output end of the third planar spiral inductor is connected to the LCR tester.

Further, it includes a wind tunnel support plate, the first planar spiral inductor and the second planar spiral inductor are arranged on the upper half and the lower half of the surface of the flexible base, and the position of the flexible base part is attached to one side of the wind tunnel support plate , the top of the flexible base extends to the outside of the end of the wind tunnel support plate, the plane center of the first planar spiral inductor is facing the end of the wind tunnel support plate; the third planar spiral inductor is fixed on the wind tunnel support The other side of the board is disposed opposite to the second planar spiral inductor.

Further, the first planar spiral inductor and the second planar spiral inductor are arranged on the same surface of the flexible substrate, and a plurality of through holes are provided on the flexible substrate, and the first planar spiral inductor and the second planar spiral inductor are arranged on the same surface. The inductors are connected in series by wires running through the vias and on the other side of the substrate.

Beneficial effects: (1) The present invention realizes the wind speed sensor by using the flexible inductance structure as the sensor sensitive element, and applies the flexible inductance with the characteristic of instant deformation to the wind speed sensor, so that the wind speed sensor can monitor the wind speed data in real time.

(2) The present invention uses the principle of mutual inductance circuit to realize wind speed detection, realizes the wireless transmission of energy between the reading end and the sensor end, and there is no power supply inside the sensor end. The wind speed sensor is miniaturized, low cost and energy efficient.

(3) The present invention utilizes the principle of mutual inductance circuit to realize wind speed detection, realizes the wireless transmission of the data volume between the reading end and the sensor end, and the wireless connection between the reading end and the sensor end. Makes the wind speed sensor suitable for harsh and sealed environments where line connections cannot be established.

Description of drawings

Figure 1 is a schematic structural diagram of a passive wireless wind speed sensor based on a flexible inductive structure;

FIG. 2 is a schematic diagram of the sensor end structure of a passive wireless wind speed sensor based on a flexible inductance structure;

FIG. 3 is a schematic diagram of the reading end structure of the passive wireless wind speed sensor based on the flexible inductance structure;

Figure 4 is a schematic diagram of the side structure of the passive wireless wind speed sensor based on the flexible inductance structure when it is not exposed to wind;

Figure 5 is a schematic diagram of the side structure of the passive wireless wind speed sensor based on the flexible inductance structure when it is exposed to wind;

FIG. 6 is a schematic diagram of the mutual inductance circuit principle of the passive wireless wind speed sensor based on the flexible inductance structure.

Detailed ways

The present invention will be further explained below in conjunction with the accompanying drawings.

As shown in FIG. 1 to FIG. 6 , a passive wireless wind speed sensor based on a flexible inductive structure includes a reading end, a sensor end and a wind tunnel support plate 8 . The sensor end includes a first planar spiral inductor 3 , a second planar spiral inductor 2 , and a flexible substrate 4 . The flexible substrate 4 is rectangular, and the first planar spiral inductor 3 and the second planar spiral inductor 2 are located on the front surface of the flexible substrate 4 and are located at the upper and lower half positions, respectively. A plurality of through holes 7 are provided on the flexible substrate 4, and the first planar spiral inductor 3 and the second planar spiral inductor 2 are connected in series by wires 5 that pass through the through holes 7 and are located on the opposite side of the substrate to form a loop. The flexible substrate 4 is partially attached to one side of the wind tunnel support plate 8 , and the plane center of the first planar spiral inductor 3 is facing the end of the wind tunnel support plate 8 . As a sensitive element, it is deformed by the wind. The substrate on which the second planar spiral inductor 2 is located is not deformed by the wind due to the support of the wind tunnel support plate 8 .

The reading end includes a third planar helical inductor 1 , and the third planar helical inductor 1 is fixed on the other side of the wind tunnel support plate 8 and is disposed opposite to the second planar helical inductor 2 . The third planar spiral inductor 1 and the second planar spiral inductor 2 maintain near-magnetic field coupling to realize wireless transmission of energy and data between the reading end and the sensor end. The output end of the third planar spiral inductor 1 is connected to the LCR tester.

The detection method of the above speed sensor is:

When there is no wind and there is wind, the side structure of the wind speed sensor is shown in Figure 4 and Figure 5; the third plane spiral inductor 1 and the second plane spiral inductor 4 in the lower half of the sensor end are fixed by the wind tunnel bracket plate 8, and the two are fixed. They are separated by a certain distance and keep the relative position unchanged, and the sensitive element at the sensor end—the flexible inductor structure faces the wind direction vertically. The lower part of the first plane spiral inductor 3 is supported and fixed by the wind tunnel bracket plate 8. When bending, the projected area of the inductance on the plane will decrease, resulting in a decrease in the inductance value. In the present invention, only the upper half of the first plane spiral inductor 3 and the extension of the top end of the flexible substrate 4 are exposed to the wind, so that the first plane spiral Inductance 3 has the most significant change in inductance due to wind deformation and bending. When the wind blows through the sensor, use the LCR tester to detect the change of the equivalent inductance of port 6 of the reading end, as shown in Figure 6, according to the mutual inductance circuit formula, the coupled inductance structure in the circuit is equivalent to a "T" type structure, and the ab port is measured by the LCR tester The equivalent inductance reverses the inductance change of the flexible inductance L3 at the sensor end to measure the wind speed.

Compared with the traditional MEMS wind speed sensor, the sensitive element of the passive wireless wind speed sensor based on the flexible inductance structure adopts flexible materials to realize real-time monitoring of wind speed data; the reading end and the sensor end transmit energy and data wirelessly, and the sensor end has no power supply and reading end. There is no wireless connection with the sensor side. The wind speed sensor is miniaturized, low cost, energy efficient and suitable for harsh and sealed environments where wiring cannot be established.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. It should be regarded as the protection scope of the present invention.

Claims (2)

1. A passive wireless wind speed sensor based on a flexible inductance structure, characterized in that it comprises a reading end and a sensor end; the sensor end comprises a first planar spiral inductor and a second planar spiral inductor; the first planar spiral inductor It is a flexible planar spiral inductor and is fixed on the surface of the flexible substrate deformed by the wind; the substrate where the second planar spiral inductor is located is not deformed by the wind, and the first planar spiral inductor and the second planar spiral inductor form a series loop; The reading end includes a third planar spiral inductor, the third planar spiral inductor and the second planar spiral inductor maintain near-magnetic field coupling, and the output end of the third planar spiral inductor is connected to the LCR tester; Including a wind tunnel support plate, the first planar spiral inductor and the second planar spiral inductor are arranged on the upper half and the lower half of the surface of the flexible base, the position of the flexible base part is attached to one side of the wind tunnel support plate, and the flexible base The top of the part extends to the outside of the end of the wind tunnel support plate, the plane center of the first planar spiral inductor is facing the end of the wind tunnel support plate; the third planar spiral inductor is fixed on the other side of the wind tunnel support plate. one side and facing the second planar spiral inductor. 2 . The passive wireless wind speed sensor based on a flexible inductor structure according to claim 1 , wherein the first planar spiral inductor and the second planar spiral inductor are both arranged on the same surface of the flexible substrate, and on the A plurality of through holes are arranged on the flexible substrate, and the first planar spiral inductor and the second planar spiral inductor are connected in series by wires passing through the through holes and located on the other side of the substrate.

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