Self-powered sensor

A sensor and self-powered technology, applied in the field of sensors, can solve the problems of reduced magnetoelectric conversion efficiency and energy output capability, low quality factor, large loss, etc., to achieve increased resonant magnetoelectric conversion efficiency, improved quality factor, and improved magnetic The effect of the electrical voltage conversion factor

Inactive Publication Date: 2009-09-23
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the self-power supply mechanism of this double-layer structure has a low quality factor, usually only tens to hundreds, poor energy concentration and large loss, which seriously reduces its magnetoelectric conversion efficiency and energy output capability. In the usual weak magnetic fields, it is difficult to power circuits and sensors
Especially in wireless sensor applications, it is almost impossible to provide radio frequency circuit work, and it is impossible to realize long-distance wireless sensing

Method used

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Examples

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Effect test

Embodiment 1

[0020] Embodiment 1: see figure 1 , a self-powered sensor, comprising a sensor 1 and a self-powered mechanism connected by a self-powered circuit 5, characterized in that: the self-powered mechanism is composed of a piezoelectric layer 2, a magnetostrictive layer 4 and a piezoelectric layer 2 and a magnetostrictive The enlargement mechanism 3 between the telescopic layers 4 constitutes. The output of the sensor is connected to the antenna 7 by the transmitting circuit 6 powered by the self-powered circuit to realize wireless signal transmission.

[0021] The above-mentioned self-powered circuit 5 adopts a conventional circuit.

[0022] The above-mentioned sensor 1 is a variety of surface acoustic wave sensors, usually composed of an interdigital transducer 8 on a piezoelectric substrate, a reflection grid 9 and a sound-absorbing material 10; the above-mentioned amplifying mechanism 3 is a mechanical quantity amplifying mechanism, such as a vibration amplifying Mechanism, For...

Embodiment 2

[0024] Embodiment 2: It differs from Embodiment 1 in that it adopts a different self-power supply mechanism, more specifically, the self-power supply mechanism adopts a different amplification mechanism.

[0025] see figure 2 In this example, one end of the amplification mechanism 3 is connected to the magnetostrictive layer 4 , and the other end is connected to the piezoelectric layer 2 through the cantilever beam 11 , and the amplification mechanism 3 is arranged at the end point of the cantilever beam 11 .

[0026] The sensor described in this example transmits the strain amplification of the magnetostrictive material to the end point of the cantilever beam 11 due to the amplification mechanism 3 of the self-power supply mechanism, so that the strain of the cantilever beam 11 is correspondingly amplified, thereby also making the piezoelectric layer 2 The output amplification improves the magnetoelectric conversion efficiency and the energy supply capacity of the system.

Embodiment 3

[0027] Embodiment 3: It differs from Embodiment 1 in that it adopts a different self-power supply mechanism, more specifically, the self-power supply mechanism adopts a different amplification mechanism.

[0028] see image 3 In this example, one end of the amplification mechanism 3 is connected to the magnetostrictive layer 4 , and the other end is connected to the piezoelectric layer 2 through the resonant beam 12 , and the amplifying mechanism 3 is arranged at the midpoint of the resonant beam 12 .

[0029] In order to obtain a better resonance effect, mass blocks 13 are added at both ends of the resonant beam 12, which further improves the sensitivity of the system.

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Abstract

The invention relates to an electromagnetic energy self-powered sensor. It includes a sensor and a self-power supply mechanism electrically connected to each other, and is characterized in that the self-power supply mechanism is composed of a piezoelectric layer, a magnetostrictive layer and an amplification mechanism between the piezoelectric layer and the magnetostrictive layer. In the sensor of the present invention, since an amplification mechanism is added to its self-power supply mechanism, its quality factor is obviously improved, energy can be collected, and the resonant magnetoelectric conversion efficiency is thus increased.

Description

technical field [0001] The invention relates to a sensor, in particular to an electromagnetic energy self-powered sensor. Background technique [0002] In a distributed passive, wireless multi-parameter array sensing system, the number of sensors distributed and the sensing distance are the most important factors affecting the application. Whether it is a sensing unit or a processing circuit, the supply of energy is the key to realizing an intelligent wireless sensor, that is, the realization of the so-called "self-powered". [0003] In the current passive wireless sensor, the energy is usually coupled to the interdigital transducer by the antenna, and then emitted by the same antenna after reflection. This type of sensor does not have any energy storage elements. Therefore, in the long-distance transmission When the distance and limited excitation energy, it is impossible to give enough signal energy to the receiving and processing circuits. Even if the communication codi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02N2/00H02N2/02H02N2/18H03H9/25
Inventor 文玉梅李平卞雷祥郑敏杨帆
Owner CHONGQING UNIV
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