Piezoelectric sensor

A piezoelectric sensor and piezoelectric induction technology, which is applied in the direction of instruments, electrical components, and electrical devices, can solve the problems of difficult battery replacement, battery recyclability, and end of service life of nodes, so as to reduce the cost of burying and avoid sensor Failure phenomenon, effect of improving reliability and durability

Active Publication Date: 2017-05-31
HOHAI UNIV
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AI Technical Summary

Problems solved by technology

[0003] At present, wireless sensor network nodes are widely powered by batteries, but sensor nodes are generally buried in walls, and it is not easy to replace the batteries. Once the batteries that provide power to the nodes are exhausted, the service life of the nodes will come to an end.
Moreover, t

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with specific examples.

[0021] Such as figure 1 and figure 2 As shown, a pressure self-powered wireless sensor for monitoring the structural deformation of the underground powerhouse of a hydropower station has a cylindrical cavity 7 in the middle, and the two ends are covered with hemispherical shells (hemispherical shell B6, hemispherical shell A8) in different ways; It includes a piezoelectric energy collection module 1, a stress wave piezoelectric sensing module 2, a wireless signal transmitting module 3 and an integrated circuit module 4; the integrated circuit module 4 is arranged on the inner wall of a cylindrical cavity, and the wireless signal transmitting module 3 is set On the hemispherical shell A8.

[0022] Such as figure 1 , image 3 As shown, the piezoelectric energy harvesting module 1 and the stress wave piezoelectric sensing module 2 both adopt a piezoelectric cantilever struct...

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Abstract

The invention discloses a piezoelectric sensor used for deformation monitoring of a pressure self-powered underground hydropower station plant structure. The piezoelectric sensor comprises a piezoelectric energy acquisition module, a stress wave piezoelectric induction acquisition module, a wireless signal transmitting module and an integrated circuit module and is buried into a concrete building in an intelligent aggregate form in the construction process of an underground hydropower station plant. The piezoelectric energy acquisition module adopts a piezoelectric cantilever beam structure made of a main material, namely, a PZT piezoelectric intelligent material, forced vibration is produced due to environment excitation, and electric energy is produced on the basis of the piezoelectric effect; the stress wave piezoelectric induction acquisition module adopts a PZT piezoelectric intelligent material as a main material and directly acquires and converts concrete structure vibration characteristics in the form of stress wave into an electrical signal, and the electrical signal can reflect deformation, stress and crack states of the structure after being analyzed; the integrated circuit module and the wireless signal transmitting module provide electric energy modulation transfer and monitored electrical signal output functions for main work modules respectively.

Description

technical field [0001] The invention relates to a wireless sensor, in particular to a wireless sensor for monitoring structural deformation of an underground powerhouse of a pressure self-powered hydropower station. Background technique [0002] The underground powerhouse of a hydropower station refers to the building in which the turbine and various auxiliary equipment are installed in the hydropower station. It is a complex of hydraulic structures, machinery and electrical equipment, and it is also a place for operating personnel to carry out production activities. With the rapid development of hydropower engineering construction, the capacity and size of modern hydroelectric generating units are increasing day by day, and the problem of hydraulic resonance of large hydroturbines is becoming more and more prominent, which not only affects the stability of the unit itself, but also causes strong vibration of plant buildings. This kind of resonance often exceeds the normal ...

Claims

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Application Information

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IPC IPC(8): H02N2/18G01B7/16G01H11/08
CPCG01B7/16G01H11/08H02N2/186
Inventor 陈波窦延虹黄梓莘李禹
Owner HOHAI UNIV
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