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Theory of the acoustic interferometer for plane waves

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A detailed investigation is presented of the electric input impedance of a piezoelectric bar and plate, loaded at one face with the acoustic impedance of an interferometer path, and free at the opposite face. The calculations start from the basic piezoelectric equations of state and lead rigorously to the strict expression for the total electric input impedance. The various properties of this impedance are discussed for variable path length of the interferometer, for variable acoustic wavelength and for a variation of the driving electric frequency. Under ordinary experimental conditions the input impedance can be represented by means of circle diagrams. The theoretical results are illustrated by numerical examples for water at 15 Mc/s and air at 1 Mc/s.

The theory presented provides a rigorous foundation for the well known theory of the acoustic interferometer given by Hubbard and extends it in various directions. The treatment includes the basic equations needed for the investigation of highly absorptive media.
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Document Type: Research Article

Publication date: January 1, 1957

More about this publication?
  • 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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