Preliminary communication
Changes of Working Parameters of a Normal Beam Non-destructive Evaluation Ultrasound Transducer Due to Different Electrical Excitations
Antonio PETOŠIĆ
orcid.org/0000-0003-2069-2764
; aculty of electrical engineering and Computing, Department of Electroacoustics, University of Zagreb, Zagreb, Croatia
Zrinka ČORAK CVJETIČANIN
; INETEC-Institute for Nuclear Technology, Zagreb, Croatia
Marko BUDIMIR
; INETEC-Institute for Nuclear Technology, Zagreb, Croatia
Abstract
The electrical excitation dependence of working parameters of a normal beam non-destructive evaluation ultrasound transducer has been investigated. Noteworthy differences between the transducer input electrical impedance and acoustic properties at low excitation voltages (~1V), most often used in electromechanical characterizations by performing frequency sweeps, and at high excitation voltages (~250V), generally used to drive ultrasound transducers in non-destructive evaluation applications, were emphasized. For the purpose of this work, a circular normal beam ultrasound transducer of centre frequency 2 MHz was constructed by using a PZT piezoelectric disk, epoxy- based acoustically passive front matching and backing layers, an electrical impedance matching element, housing and coaxial cable. The transducer was characterized around the thickness extensional vibration mode both by using low and high voltage electrical excitation signals. The characterization of the electromechanical properties was conducted at several different stages of the transducer construction and for several excitation signal waveforms and levels.
Keywords
Electrical excitation waveform; Non-destructive testing; Piezoelectric ceramic; Ultrasound transducer
Hrčak ID:
78442
URI
Publication date:
30.6.2011.
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