Nonlinear electromechanical response of the ferroelectret ultrasonic transducers

0352399 - FZÚ 2011 RIV DE eng J - Journal Article
Döring, J. - Bovtun, Viktor - Bartusch, J. - Erhard, A. - Kreutzbruck, M. - Yakymenko, Y.
Nonlinear electromechanical response of the ferroelectret ultrasonic transducers.
Applied Physics A - Materials Science & Processing. Roč. 100, č. 2 (2010), 479-485. ISSN 0947-8396. E-ISSN 1432-0630
R&D Projects: GA ČR GAP204/10/0616; GA ČR(CZ) GA202/09/0682
Institutional research plan: CEZ:AV0Z10100520
Keywords : piezoelectric * ferroelectret * transducer * ultrasonic
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.765, year: 2010

The ultrasonic transmission between two aircoupled polypropylene (PP) ferroelectret (FE) transducers in dependence on the amplitude of the high-voltage exciting pulse revealed a strongly nonlinear electromechanical response of the FE transmitter. This phenomenon is described by a linear increase of the inverse electromechanical transducer constant of the PP FE film with an increase of the exciting electrical pulse amplitude (by a factor of 4). The electrostriction contribution can be attributed to the electrostatic force between electrodes and the Maxwell stress effect. A significant enhancement of the ACUS system transmission (12 dB) and signal-to-noise ratio (32 dB) was demonstrated by the increase of excitation voltage up to 3500 V.
Permanent Link: http://hdl.handle.net/11104/0006199