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Measurement of Ultrasonic Diffraction Loss for Circular Transducers

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Transducer calibrations without a primary standard in the MHz-frequency range are performed expediently in the near-field using the self-reciprocity technique for minimizing the sound attenuation corrections and the alignment problems. As a consequence a knowledge of the effective ultrasonic diffraction loss in the field of the transducer is necessary. In order to investigate how far the calculated diffraction corrections by Khimunin and Papadakis can be applied to real transducers, measurements with different circular transducers have been performed at normalized distances zλ/a 2 between 0.2 and 5, where z is the propagation distance, a is the transducer radius, and λ is the wavelength of the radiated sound wave. It is shown that the agreement between experiment and calculation is better than ±0.5 dB.
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Document Type: Research Article

Publication date: February 1, 1975

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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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