High-Performance wideband Ultrasonic `Sell`-Transducer Jürgen Peissig, Vladimir Gorelik, Rainer Wiggers, Sennheiser electronic, Wedemark The ultrasonic (US) transducer based on Sell`s principle is well known to work invertible as microphone and speaker with a broad-band frequency response. US transducers are used for movement and distance sensors, flow-meters and in parametric transducers where it is important to have a high US sound level in air and good directivity. Driven by these applications we developed several versions of Sell transducers with optimised backplate structures for high sound pressure levels, minimum loss due to the membrane suspension, optimal drive of the membrane surface and high directivity. Different membrane materials und vent openings result in different frequency responses. The transducer design, its acoustical performance and the applications will be discussed.
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