Acoustic Transfer Impedance of Plane-Wave Couplers
Abstract:The precision of the primary pressure reciprocity calibration technique at high frequencies is limited by the accuracy in calculating the acoustic transfer impedance. The expression given in the current International Standard is only dealing with plane waves in the coupler and is not valid at higher frequencies. In this paper the acoustic transfer impedance is derived from the simultaneous solution of the wave equations governing the acoustic field in the coupler and the motion of the transmitter and receiver microphone diaphragms. Numerical results for common one-inch and half-inch couplers are presented. At low frequencies the results coincide with the plane-wave theory. The correction factors accounting for the radial wave motion are introduced and compared with the values given in literature.
Document Type: Research Article
Publication date: 2006-07-01
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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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