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- W4254795269 abstract "This paper reports the results of a new experimental method to measure the real and imaginary parts of the ground impedance assuming the validity of Thomasson's model. A small loudspeaker placed above the ground is fed by a sweeping pure tone and the sound field is recorded by two or more microphones. The ratio of pressures at two microphone locations provides two equations (real and imaginary part) which are sufficient to determine the real and imaginary part of ground impedance. This method does not require knowledge of the spectrum and strength of the sound source. There are no assumptions as to the nature of ground cover except that of local reaction. For a given pair of microphones there is a frequency range of maximum excess attenuation difference where this method is most sensitive in determining ground impedance. The sensitivity can be extended by taking more than two microphone position measurements. [Work supported by FHWA.]" @default.
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- W4254795269 date "1980-04-01" @default.
- W4254795269 modified "2023-10-17" @default.
- W4254795269 title "A method of measuring the acoustic impedance of the ground by using two or more microphones" @default.
- W4254795269 doi "https://doi.org/10.1121/1.2018281" @default.
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