Abstract

On passage through a random phase plate a collimated laser beam breaks up into a speckle pattern which can be imaged on a detector placed some distance away from the phase plate. If the phase plate is moving transversely to the direction of the laser beam, this movement is followed exactly by the speckle pattern. The magnitude of the transverse velocity can be obtained by processing the random signal produced by the detector. Experimental and theoretical investigations show this to be a robust technique for measuring surface or averaged fluid-flow velocities, with possible applications to radar and sonar.

© 1984 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Speckle-based three-dimensional velocity measurement using spatial filtering velocimetry

Theis F. Q. Iversen, Michael L. Jakobsen, and Steen G. Hanson
Appl. Opt. 50(11) 1523-1533 (2011)

Measuring fluid velocities with speckle patterns

D. B. Barker and M. E. Fourney
Opt. Lett. 1(4) 135-137 (1977)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (5)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (2)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription