阅读说明：本技术 一种基于柔性电感结构的无源无线风速传感器 (Passive wireless wind speed sensor based on flexible inductance structure ) 是由 易真翔 程星全 于 2021-08-23 设计创作，主要内容包括：本发明公开了一种基于柔性电感结构的无源无线风速传感器,包括读数端和传感器端；传感器端包括第一平面螺旋电感和第二平面螺旋电感；第一平面螺旋电感为柔性平面螺旋电感,并固定在受风形变的柔性基底表面；第二平面螺旋电感所在的基底受风不发生形变,第一平面螺旋电感和第二平面螺旋电感形成串联回路；读数端包括第三平面螺旋电感,第三平面螺旋电感与第二平面螺旋电感保持近磁场耦合,第三平面螺旋电感的输出端连接LCR测试仪。本发明实现了基于互感电路原理的能量信息无线传输与风速测量,解决了现有风速传感器由于需要电池和走线无法满足物联网技术中小型化、高能效、适用环境灵活等应用需求的技术问题。(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 can not meet the application requirements of small and medium size, high energy efficiency, flexible applicable environment and the like in the Internet of things technology due to the requirement of batteries and wiring.)

1. A passive wireless wind speed sensor based on a flexible inductance structure is characterized by comprising 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 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.

2. The passive wireless wind speed sensor based on the flexible inductance structure is characterized by comprising a wind tunnel support plate, wherein a first planar spiral inductor and a second planar spiral inductor are arranged on the upper half part and the lower half part of the surface of a flexible substrate, the position of the bottom of the flexible substrate is attached to one surface of the wind tunnel support plate, the top of the flexible substrate extends to the outer side of the end part of the wind tunnel support plate, and the plane center of the first planar spiral inductor is opposite to the position of the end part of the wind tunnel support plate; the third planar spiral inductor is fixed on the other surface of the wind tunnel support plate and is arranged opposite to the second planar spiral inductor.

3. The passive wireless wind speed sensor based on the flexible inductance structure according to claim 2, wherein the first planar spiral inductor and the second planar spiral inductor are both disposed on the same surface of the flexible substrate, a plurality of through holes are disposed on the flexible substrate, and the first planar spiral inductor and the second planar spiral inductor are connected in series by a wire passing through the through holes and located on the other surface of the substrate.

Technical Field

The invention relates to a passive wireless wind speed sensor.

Background

The internet of things is developing rapidly, and sensors are an important ring of the internet of things. Typically, the sensor nodes are battery powered and wired, which prevents deployment in inaccessible or hard-to-reach places, frequent battery replacement also increases maintenance costs, and the battery and wiring increase area, which is not conducive to high energy efficiency and high density distribution. Passive wireless sensors are capable of continuous real-time detection, require remote sensor power, and occupy a smaller amount of space in certain harsh and sealed environments where it is difficult to establish a wired connection.

Wind speed sensors have been widely used for decades, and various wind sensors using different principles have been widely studied so far based on Micro Electro Mechanical Systems (MEMS) technology. As the equipment for measuring the wind speed, the wind speed sensor is small and exquisite and light in appearance, convenient to carry and assemble, and capable of conveniently and effectively obtaining wind speed information. The water-based paint is mainly used in the fields of meteorology, agriculture, ships, industry, environmental protection and the like, and is required to be used outdoors for a long time.

Disclosure of Invention

The purpose of the invention is as follows: aiming at the prior art, the passive wireless wind speed sensor based on the flexible inductance structure is provided, and the problem that the existing wind speed sensor cannot meet the miniaturization of the Internet of things technology due to the fact that batteries and wiring are needed is solved.

The technical scheme is as follows: a passive wireless wind speed sensor based on a flexible inductance structure 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 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 flexible substrate is attached to one surface of the wind tunnel support plate, the top of the flexible substrate extends to the outer side of the end part of the wind tunnel support plate, and the plane center of the first plane spiral inductor is opposite to the end part of the wind tunnel support plate; the third planar spiral inductor is fixed on the other surface of the wind tunnel support plate and is arranged opposite to the second planar spiral inductor.

Furthermore, the first planar spiral inductor and the second planar spiral inductor are both arranged on the same surface of the flexible substrate, a plurality of through holes are formed in the flexible substrate, and the first planar spiral inductor and the second planar spiral inductor are connected in series through a lead which penetrates through the through holes and is located on the other surface of the substrate.

Has the advantages that: (1) according to the invention, the wind speed sensor is realized by taking the flexible inductance structure as a sensor sensitive element, and the flexible inductance with the characteristic of deformation instantaneity is applied to the wind speed sensor, so that the wind speed sensor can monitor wind speed data in real time.

(2) The invention realizes wind speed detection by utilizing the mutual inductance circuit principle, realizes wireless transmission of energy between a reading end and a sensor end, and has no power supply inside the sensor end. The wind speed sensor is miniaturized, low in cost and high in energy efficiency.

(3) The wind speed detection is realized by utilizing the mutual inductance circuit principle, the wireless transmission of data quantity between the reading end and the sensor end is realized, and the reading end is connected with the sensor end through a wireless circuit. So that the wind speed sensor can be applied to harsh and sealed environments where line connections cannot be established.

Drawings

FIG. 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 a sensor end structure of a passive wireless wind speed sensor based on a flexible inductive structure;

FIG. 3 is a schematic view of a reading end structure of a passive wireless wind speed sensor based on a flexible inductive structure;

FIG. 4 is a schematic side view of a passive wireless wind speed sensor based on a flexible inductive structure when not exposed to wind;

FIG. 5 is a schematic side view of a passive wireless wind speed sensor based on a flexible inductance structure when the sensor is exposed to wind;

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

Detailed Description

The invention is further explained below with reference to the drawings.

As shown in fig. 1 to 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 terminal comprises 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 located at the upper half part and the lower half part respectively. A plurality of through holes 7 are formed in the flexible substrate 4, and the first planar spiral inductor 3 and the second planar spiral inductor 2 are connected in series through a lead 5 which penetrates through the through holes 7 and is positioned on the reverse side of the substrate to form a loop. The flexible substrate 4 is partially attached to one surface of the wind tunnel support plate 8, and the plane center of the first planar spiral inductor 3 is over against the end position of the wind tunnel support plate 8 and serves as a sensitive element to deform when being affected by wind. The substrate where the second planar spiral inductor 2 is located is supported by the wind tunnel support plate 8, and does not deform when being subjected to wind.

The reading end comprises a third planar spiral inductor 1, and the third planar spiral inductor 1 is fixed on the other surface of the wind tunnel support plate 8 and is opposite to the second planar spiral inductor 2. The third planar spiral inductor 1 and the second planar spiral inductor 2 keep near magnetic field coupling so as to realize wireless transmission of energy and data between the reading end and the sensor end, no power supply is arranged in the sensor end, and the two ends are connected in a wireless way. The output end of the third planar spiral inductor 1 is connected with the LCR tester.

The detection method of the speed sensor comprises the following steps:

the side structures of the wind speed sensor are shown in fig. 4 and 5 when no wind exists or wind exists; the third planar spiral inductor 1 and the second planar spiral inductor 4 on the lower half part of the sensor end are fixed through the wind tunnel support plate 8, a certain distance is reserved between the third planar spiral inductor 1 and the second planar spiral inductor 4, the relative position is kept unchanged, a sensor end sensitive element, namely a flexible inductor structure, is vertically faced to the wind direction, the lower half part of the first planar spiral inductor 3 is supported and fixed through the wind tunnel support plate 8, when the flexible substrate is bent by wind, the projection area of the inductor on the plane can be reduced, and therefore the inductance value is reduced. When wind blows over the sensor, the equivalent inductance change of the port 6 of the reading end is detected through the LCR tester, as shown in fig. 6, the coupling inductance structure in the circuit is equivalent to a T-shaped structure according to a mutual inductance circuit formula, and the inductance change of the flexible inductance L3 at the sensor end is reversely pushed through the equivalent inductance of the port ab measured through the LCR tester to measure the wind speed.

Compared with the traditional MEMS wind speed sensor, the sensing element of the passive wireless wind speed sensor based on the flexible inductance structure is made of flexible materials, so that the real-time monitoring of wind speed data is realized; the energy and data of the reading end and the sensor end are transmitted wirelessly, no power supply is arranged in the sensor end, and the reading end is connected with the sensor end through a wireless circuit. The wind speed sensor is miniaturized, low in cost, high in energy efficiency and suitable for harsh and sealed environments where line connection cannot be established.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.