Liquid drops were levitated and deformed with acoustic techniques and illuminated
with monochromatic light. Changes in the rainbow-angle scattering induced by the
deformations were detected. Reflected and refracted rays form an interference
pattern that changes with shape and the angle of Airy’s diffraction
pattern shifts. A calculation by W. Möbius [ Ann. Phys. (Leipzig) 33, 1493 (
1910)] was modified to facilitate the
use of these changes for the measurement of micron amplitude shape oscillations
of millimeter radius drops.
© 1980 Optical Society of America
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