TY - CONF A1 - Bartusch, Jürgen A1 - Döring, Joachim A1 - Gaal, Mate A1 - Hillger, W. T1 - Untersuchungen zum Einsatz von PP-Schaumfoliensensoren für die berührungslose Ultraschallprüfung mit Ankopplung über Luft T2 - DGZfP-Jahrestagung 2010 T2 - DGZfP-Jahrestagung 2010 CY - Erfurt, Germany DA - 2010-05-10 PY - 2010 AN - OPUS4-21637 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Döring, Joachim A1 - Bovtun, Viktor Petrovic A1 - Bartusch, Jürgen A1 - Erhard, Anton A1 - Kreutzbruck, Marc A1 - Yakymenko, Y. T1 - Nonlinear electromechanical response of the ferroelectret ultrasonic transducers JF - Applied physics A N2 - The ultrasonic transmission between two air-coupled 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 t33(1) of the PP FE film with an increase of the exciting electrical pulse amplitude. Enlargement of t33(1) by a factor of 4 was achieved by application of 3500 V exciting pulses. The electrostriction contribution to t33(1) can be attributed to the electrostatic force between electrodes and the Maxwell stress effect. The nonlinear electromechanical properties of the PP FE result in a strong increase of its air-coupled ultrasonic (ACUS) figure of merit (FOM) under the high-voltage excitation, which exceeds results of the PP FE technological optimization. The FOM increase can be related to the increase of PP FE coupling factor and/or to the decrease of its acoustic impedance. 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. The nonlinear electromechanical properties of the PP FEs seem to be very important for their future applications. KW - Airborne ultrasonics KW - Electret film KW - Transducer KW - Nonlinearity PY - 2010 DO - https://doi.org/10.1007/s00339-010-5752-7 SN - 0947-8396 VL - 100 IS - 2 SP - 479 EP - 485 PB - Springer CY - Berlin AN - OPUS4-21809 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gaal, Mate A1 - Döring, Joachim A1 - Bartusch, Jürgen A1 - Brekow, Gerhard T1 - Einsatz von Luftultraschall-Sensoren mit geringer akustischer Impedanz T2 - DAGA 2010 - 36. Jahrestagung für Akustik T2 - DAGA 2010 - 36. Jahrestagung für Akustik CY - Berlin, Deutschland DA - 2010-03-15 KW - Luftultraschall KW - Sensor KW - Akustische Impedanz KW - Polypropylen PY - 2010 SN - 978-3-9808659-8-2 SP - 1041 EP - 1042 CY - Berlin AN - OPUS4-26402 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gaal, Mate A1 - Döring, Joachim A1 - Bartusch, Jürgen A1 - Brekow, Gerhard T1 - Entwicklung von Luftschall-Sensoren mit geringer akustischer Impedanz T2 - Sensoren und Messsysteme 2010 - 15. ITG/GMA-Fachtagung T2 - Sensoren und Messsysteme 2010 - 15. ITG/GMA-Fachtagung CY - Nürnberg, Deutschland DA - 2010-05-18 KW - Luftultraschall KW - Sensor KW - Akustische Impedanz KW - Polypropylen PY - 2010 SN - 978-3-8007-3260-9 IS - A9/Paper 48 SP - 275 EP - 279 PB - VDE Verlag GmbH CY - Berlin, Offenbach AN - OPUS4-26407 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -