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Ferroelectrets are excellent materials for electroacoustic transducers. The materials offer both a rather large bandwidth and a high piezoelectric strain constant. Due to their cellular structure, the materials are flexible and exhibit good matching to air. Therefore, these polymers are appropriate for many sound as well as ultrasound transducer applications. Our research is concentrated on the simulation based design and characterization of ultrasound transducers. We fabricate single element and array transducers based on ferroelectret materials, namely the so-called EMFi (Electro-Mechanical-Film) material. In order to show the applicability of ferroelectret materials for ultrasound transducers, we have developed different applications for air and water. Here, we present a robust sensor array consisting of 16 single elements (4×4). With the aid of this sensor array, cavitation effects in ultrasonic cleaning systems can be investigated on the specimen’s surface, which is not possible with common ultrasound sensors, e.g., hydrophones.

A8.2 - Research on Ferroelectret Based Ultrasound Transducers