Linearly polarized laser light is scattered from an oscillating, acoustically levitated bubble, and the scattered intensity is measured with a suitable photodetector. The output photodetector current is converted into a voltage and digitized. For spherical bubbles, the scattered intensity I_rel(R,θ,t) as a function of radius R and angle θ is calculated theoretically by solving the boundary value problem (Mie theory) for the water-bubble interface. The inverse transfer function R(I) is obtained by integrating over the photodetector solid angle centered at some constant θ. Using R(I) as a look-up table, the radius vs time [R(t)] response is calculated from the measured intensity vs time [I_exp(R,t)].

© 1990 Optical Society of America

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