We present a novel fluid-velocimetry technique based on speckle interferometry. The light scattered from an illuminated plane is recorded with a CCD camera at the same time as a speckled reference beam. Substraction of two nonsimultaneous frames provides information about the velocity field for an out-of-plane component. An application to a Rayleigh–Bénard convective flow is given.
© 1999 Optical Society of America
(120.6160) Instrumentation, measurement, and metrology : Speckle interferometry
(120.7250) Instrumentation, measurement, and metrology : Velocimetry
(280.2490) Remote sensing and sensors : Flow diagnostics
Nieves Andrés, M. Pilar Arroyo, Heiko Hinrichs, and Manuel Quintanilla, "Digital speckle-pattern interferometry as a full-field fluid-velocimetry technique," Opt. Lett. 24, 575-577 (1999)