Piezoelectric sensor

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 ...

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, the batteries on the sensor nodes used in large quantities cannot be recycled, so the discarded batteries will cause huge pollution to the environment

If the wiring is arranged to supply electricity to the sensor through the grid, the cost is high, the wiring is complicated, and maintenance is difficult

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