An Air Sound Transducer for Frequencies in the Range 50 kHz to 100 kHz Using the Sell Principle
Investigations have been carried out on Sell transducers having grooved counter electrodes as regards the transmission curves, directional pattern and time stability of the transducer characteristics. Below the first resonance frequency the transmission for the transmitter varied as square of the frequency (f) and the response of the receiver was frequency independent. The time stability was satisfactory using suitable electrodes and lay out of the counter electrodes. The directional pattern showed pronounced secondary lobes as for rigid discs (measurement in the direction of the first secondary lobe: ≈ −17.5 dB). By means of an absorbent conduit above the Sell transducer the measured value in the direction of the first secondary lobe could be reduced to about −40 dB (f = 70kHz).
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Document Type: Research Article
Publication date: January 1, 1974
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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