Enhanced electromechanical response of ferroelectret ultrasonic transducers under high voltage excitation

0426511 - FZÚ 2014 RIV GB eng J - Článek v odborném periodiku
Bovtun, Viktor - Döring, J. - Bartusch, J. - Gaal, M. - Erhard, A. - Kreutzbruck, M. - Yakymenko, Y.
Enhanced electromechanical response of ferroelectret ultrasonic transducers under high voltage excitation.
Advances in Applied Ceramics. Roč. 112, č. 2 (2013), s. 97-102. ISSN 1743-6753. E-ISSN 1743-6761
Grant CEP: GA ČR GAP204/10/0616
Výzkumný záměr: CEZ:AV0Z10100520
Klíčová slova: air coupled ultrasonics * non-contact transducers * ferroelectrets * piezoelectric effect * electrostriction
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 1.107, rok: 2013

Polypropylene based ferroelectret films exhibit a strong electromechanical activity and provide a promising solution for the air coupled ultrasonic (ACUS) transducers. Ultrasonic transmission between two air coupled ferroelectret transducers in dependence on the amplitude and polarity of the high voltage exciting pulse revealed a strongly non-linear electromechanical response of the ferroelectret transmitter which provides an increase in the transmitter efficiency. Enlargement of the inverse transducer constant of the polypropylene ferroelectret film by a factor of 4 was demonstrated. The non-linear properties of the polypropylene ferroelectrets result in a strong increase in their ACUS figure of merit under the high voltage excitation, which exceeds the results of their technological optimisation. Consequently, enhancement of the ACUS system transmission by 12 dB and signal to noise ratio by 32 dB was achieved.
Trvalý link: http://hdl.handle.net/11104/0232215