Acoustic diffusion wave in turbid media
Sakai, K.
Kanda, O.
Yamamoto, K.
Takagi, K.
Inst. of Ind. Sci., Tokyo Univ.;
This paper appears in: Ultrasonics Symposium, 1999. Proceedings. 1999 IEEE
Publication Date: 1999
Volume: 1,
On page(s): 715-718 vol.1
Meeting Date: 10/17/1999 - 10/20/1999
Location: Caesars Tahoe, NV, USA
ISSN: 1051-0117
ISBN: 0-7803-5722-1
References Cited: 1
INSPEC Accession Number: 6683880
Digital Object Identifier: 10.1109/ULTSYM.1999.849498
Current Version Published: 2002-08-06
Abstract
The acoustic diffusion wave in a turbid medium including randomly
dispersed wave scatterers was observed. Ultrasonic wave at 15 MHz was
modulated in amplitude and emitted into water suspension of polystyrene
beads with 0.2 mm in diameter. Ray trace of the wave takes a random walk
in the multiple scattering, and the acoustic energy flows in a
diffusional manner. The spatial distribution of the oscillating acoustic
energy was observed with an optical probe based on the Raman-Nath
diffraction. The wavenumber and the spatial damping of the diffusion
waves were determined at the modulation frequency of 4-20 kHz range. The
results were well described by a modified diffusion theory including the
effect of ultrasonic absorption. The diffusion constant and the lifetime
of the acoustic energy were determined, which led to the transport mean
free path and the ultrasonic absorption. The experiment was made at
different volume fractions of the suspension, and l* and the lifetime
were found to decrease with the number density of the scatterer
Index
Terms
Available to subscribers and IEEE members.
References
Available to subscribers and IEEE members.
Citing Documents
Available to subscribers and IEEE members.
Cart
