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Proceedings 2017, 1(4), 362;

Air-Coupled Ultrasonic Ferroelectret Receiver with Additional DC Voltage

Bundesanstalt für Materialforschung und-prüfung (BAM), Berlin, Germany
Technische Universität Darmstadt, Darmstadt, Germany
Presented at the Eurosensors 2017 Conference, Paris, France, 3–6 September 2017.
Author to whom correspondence should be addressed.
Published: 16 August 2017
(This article belongs to the Proceedings of Eurosensors 2017)
PDF [750 KB, uploaded 16 August 2017]


Highly sensitive air-coupled ultrasonic sensors are essential for various applications such as testing of composite materials. One of the major challenges for the development of air-coupled ultrasonic sensors is the impedance matching to air. With a lower acoustic impedance than the usual piezoelectric materials, charged cellular polypropylene film (cPP) offers better matching to air with a similar piezoelectric coefficient. The piezoelectric behaviour demonstrated by cPP comes from polarized air cells that create a permanent internal voltage. The sensitivity of the sensor varies with the application of an additional DC bias voltage. Thus, this work presents a cPP ultrasonic sensor with an improvement of up to 15 ± 1 dB on the signal-to-noise ratio.
Keywords: ultrasonic; air-coupled; cellular polypropylene; transducer; ferroelectret ultrasonic; air-coupled; cellular polypropylene; transducer; ferroelectret
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Gaal, M.; Caldeira, R.; Bartusch, J.; Kupnik, M. Air-Coupled Ultrasonic Ferroelectret Receiver with Additional DC Voltage. Proceedings 2017, 1, 362.

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