Fluid surface imaging using microlens arrays |
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Authors: | T Roesgen A Lang M Gharib |
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Institution: | (1) Institute for Fluid Dynamics, ETH Zürich, Sonneggstr. 3 CH-8092 Zürich, Switzerland, CH;(2) Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, CA 91125, USA, US;(3) Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, CA 91125, USA, US |
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Abstract: | The paper describes a new technique for measuring surface slopes at the air–water interface. A microlens array is employed
to optically sample the fluid surface at a large number of measurement points in parallel. The focal plane image of the lenslet
array is recorded by a standard video camera, generating a data set of typically 4000 candidate samples for each video frame.
The displacement of the focal spots is analyzed using a cross-correlation technique augmented by a topological identification
algorithm which makes use of the hexagonal structure of the lenslet array. Surface height profiles are computed by integrating
the surface slope field.
Received: 19 March 1997 / Accepted: 5 January 1998 |
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