Roesgen, T. and Lang, A. and Gharib, M. (1998) Fluid surface imaging using microlens arrays. Experiments in Fluids, 25 (2). pp. 126-132. ISSN 0723-4864. https://resolver.caltech.edu/CaltechAUTHORS:20130912-081404700
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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.
| Item Type: | Article | |||||||||
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| Additional Information: | © 1998 Springer Verlag. Received: 19 March 1997; Accepted: 5 January 1998. This work was supported by ONR grant N-00014-94-1-0596. | |||||||||
| Group: | GALCIT | |||||||||
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| Issue or Number: | 2 | |||||||||
| Record Number: | CaltechAUTHORS:20130912-081404700 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20130912-081404700 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 41270 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Tony Diaz | |||||||||
| Deposited On: | 17 Sep 2013 20:07 | |||||||||
| Last Modified: | 03 Oct 2019 05:47 |
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