Roos M S
Department of Applied Mechanics, Yale University, New Haven, Connecticut 06520.
J Acoust Soc Am. 1988 Feb;83(2):770-6. doi: 10.1121/1.396120.
A technique for observing acoustic scattering from individual particles with volumes on the order of 100 micron3 is described. The apparatus consists of an array of focused acoustic transducers, a fluid jet to position the particles, and electronics incorporating quadrature detection. A maximum likelihood estimator is developed for the scattering amplitude that combines the data received from a series of pulses as a particle is carried through the focal zone of the transducers. A calibration method and performance of the apparatus are discussed.
