how to use piezoelectric sensor

piezoelectric plate transducer

piezo bimorph actuator

piezo element sensor

China's construction accidents occur more frequently, such as the breakage of bridges and the collapse of houses,which is causing major property damage and even threatening people's lives. This has caused people's attention and attention to the safety of construction projects. Therefore,piezoelectric plate transducer is an inevitable requirement for the construction project to monitor the structural performance of a building project, which detects the damage situation of the structure in a timely manner, piezo bimorph actuator is making early warning of possible disasters, and assess the health of the structure. Most of the construction projects in China use concrete structures. Therefore, the health inspection of concrete structures is of practical significance. Commonly used detection methods include lossy detection and non-destructive testing. Loss detection usually results in structural damage. The scope of PZT5 piezoelectric transducer is limited. Non-destructive testing methods are generally used in actual projects. The traditional non-destructive testing methods only sample and test the concrete structure on a regular basis, and cannot realize the real-time monitoring and diagnosis of the structural performance, and cannot make timely response at the critical moment.

Piezoelectric ceramic materials have been widely used in structural damage diagnosis and health testing due to their advantages of low cost, fast response, simple structure, and good reliability piezo ceramic cylinder. The method of on-line monitoring of the internal structure of concrete with the piezoelectric embedded embedded concrete smart module embedded in the concrete is proposed to make up for the deficiency of the traditional non-destructive testing. The piezoelectric ceramic buried in the concrete was excited by periodic pulses of different frequencies piezo element sensor. By analyzing the received ultrasonic signals, it was found that the received signal energy was maximized under the excitation of a periodic pulse of 79 kHz. Ultrasonic vibration of piezoelectric ceramics will produce acoustic wave diffusion and energy attenuation during the propagation process, resulting in limited ultrasonic energy received at the receiving end, which is not conducive to analysis and processing. When piezoelectric ceramic sensor is studying the acoustic energy characteristics of backing structure PZT in thickness vibration mode, it is found that when the excitation frequency is in the range of 60 kHz ~100 kHz, the ultrasonic signal energy received by the receiving end is larger, which is suitable for non-destructive testing. In addition, for different sizes of piezoelectric ceramics, there are multiple resonant frequencies, the maximum amplitude that can be achieved is not the same, and the ultrasonic signal energy of the piezoelectric ceramic vibrational radiation is related to its vibration amplitude.