Autori: Irinela Chilibon

Editorial: ISBN: 978-0-7695-4094-8/10 , IEEE, Proc. of 2010 First International Conference on Sensor Device Technologies and Applications, SENSORDEVICES 2010, Venice, 18-25 July 2010, p.32-37, 2010.

Rezumat:

This paper presents theoretical and experimental research concerning the manufacture of an intelligent piezoceramic sensor for non-destructive tests (NDT) applications in non-metallic materials.
The non-destructive impact-echo method is a suitable technique for the flaw detection in the material structure, based on stress wave propagation. A transient stress pulse is introduced into the sample by an impact shock wave hammer placed on the element surface. This method could be applied for non-metallic materials with rugged and non-homogeneous structures, such as the concrete. The active element of the intelligent piezoceramic sensor for NDT applications is the piezoceramic disc which converts the vibrations into electrical signal, which is amplified by an electronic amplifier circuit. The radial resonant frequency of the piezoceramic disc is 40.5 kHz, optimum for the ultrasound and low frequency sound vibration propagation into non-metallic materials. The intelligent sensor with piezoceramic disc is composed by: the PZT piezoceramic disc, mechanical elements, acoustic attenuation element and amplifier electronic circuit which are placed into an aluminium case.

Cuvinte cheie: NDT, impact-echo method, non-metallic material, soft PZT, piezoceramic disc, ultrasound