The attenuation of an ultrasonic wave in porous rocks has been measured by means of a spectral analysis technique in the frequency range 100 kHz-1 MHz. Experimental results, after compensation for the geometric divergence of the emitted ray beam, are presented for three types of rocks. They display two characteristics, essentially related to the nature and the structure of the probes: the quality factor Q does not depend on frequency (Q is fairly constant in the whole range of exploration): and the attenuation remains high. Experimental data are also compared to predictions obtained from different models, but only Sto1l's composite model gives predictions in fair agreement with experiments.
Document Type: Research Article
Publication date: September 1, 1996
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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.