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Application of the Two-Microphone Method for In-Situ Ground Impedance Measurements

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The two-microphone method is a convenient and well-known procedure to measure the surface impedance in-situ. Its proposed implementation in an ANSI standard (“Direct Deduction of Ground Impedance”) will contribute to it's wide use. The applicability and adequacy of this method for this purpose is investigated in this article. Measurements of the surface impedance of a number of grounds, which are carried out with the three ANSI S1.18 geometries, are presented. It is shown that the two-microphone method does provide reasonable results on not too hard grounds for frequencies above about 400 Hz, while the performance at lower frequencies and for hard grounds is poor. Practical advise is given on the number of measurements needed and the data pre-processing.
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Document Type: Research Article

Publication date: September 1, 2007

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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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