J. Kushibiki et al., TRANSMISSION-LINE METHOD FOR THE MEASUREMENT OF THE ACOUSTIC NONLINEARITY PARAMETER IN BIOLOGICAL LIQUIDS AT VERY HIGH-FREQUENCIES, The Journal of the Acoustical Society of America, 102(5), 1997, pp. 3038-3044
Nonlinear wave propagation in a system consisting of a liquid specimen
held between two SiO2 buffer rods is studied as a new method of deter
mining the acoustic nonlinearity parameter of liquids at very high fre
quencies. Since the sign of the nonlinearity parameter of SiO2 is oppo
site that for liquids, the system can be viewed as a transmission line
containing regions of both positive and negative nonlinearity. The no
nlinear characterization curve is employed in which the second harmoni
c component output of the receiving transducer is plotted as a functio
n of propagation distance in liquids between the two SiO2 buffer rods.
The nonlinearity parameter is determined by measuring the dip positio
n at which the transducer output becomes zero in the curve. Measuremen
ts are reported for water and aqueous solutions of dextrose and dextra
n in the fundamental frequency range 100-200 MHz. (C) 1997 Acoustical
Society of America.