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Self-powered sensor

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

Inactive Publication Date: 2007-02-21
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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Embodiment 1

[0020] Example 1: see figure 1 , A self-powered sensor, comprising a sensor 1 and a self-powered mechanism connected through a self-powered circuit 5, characterized in that: the self-powered mechanism consists of a piezoelectric layer 2, a magnetostrictive layer 4, and a piezoelectric layer 2 and a magnetostrictive The magnifying mechanism 3 between the stretchable layers 4 is constituted. The sensor output is powered by a self-powered circuit. The transmitter circuit 6 is connected to the antenna 7 to realize wireless signal transmission.

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

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

Embodiment 2

[0024] Embodiment 2: It is different from Embodiment 1 in that it uses a different self-powered mechanism, more specifically, the self-powered mechanism uses a different amplifying mechanism.

[0025] See figure 2 One end of the amplifying mechanism 3 in this example is connected to the magnetostrictive layer 4, and the other end is connected to the piezoelectric layer 2 through a cantilever beam 11, and the amplifying mechanism 3 is set at the end of the cantilever beam 11.

[0026] In the sensor described in this example, since the amplifying mechanism 3 of its self-powered mechanism transmits the strain amplification of the magnetostrictive material to the end point of the cantilever beam 11, 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 is different from Embodiment 1 in that it uses a different self-powered mechanism, more specifically, the self-powered mechanism uses a different amplifying mechanism.

[0028] See image 3 One end of the amplifying mechanism 3 of this example is connected to the magnetostrictive layer 4, and the other end is connected to the piezoelectric layer 2 through a resonance beam 12, and the amplifying mechanism 3 is arranged at the midpoint of the resonance beam 12.

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

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Abstract

The invention comprises a sensor and a self-powered device, the both above are connected each other. The self-powered device comprises a piezoelectric layer, a magnetostriction layer and an amplification unit located between the piezoelectric layer and the magnetostriction layer. It features adding an amplification unit in the self-powered device.

Description

Technical field [0001] The invention relates to a sensor, in particular to a self-powered electromagnetic energy sensor. Background technique [0002] In the 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 provision of energy is the key to the realization of intelligent wireless sensors, which is the realization of the so-called "self-powered". [0003] In the current passive wireless sensors, energy is usually coupled to the interdigital transducer by the antenna, and is emitted by the same antenna after reflection. This type of sensor does not have any energy storage elements, so it is transmitted in a long distance. With distance and limited excitation energy, it is impossible to give enough signal energy to the receiving and processing circuits. Even if the communication coding method...

Claims

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Application Information

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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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