Abstract
This paper describes an optical spatial filtering velocimetry technique that converts an expanding or contracting speckle pattern into a photocurrent. This photocurrent will have a quasi-sinusoidal dependency on this specific speckle motion. The spatial filter consists of a series of concentric rings. Each ring divides the incoming light into two radial-wise, almost even contributions and directs them by refraction toward two half-rings of photodetectors. The corresponding two photocurrents are balanced and provide a differential photocurrent. In this paper the optical spatial filtering velocimetry technique is used to demonstrate real-time measurements of speckle dynamics due to out-of-plane motion.
© 2016 Optical Society of America
Full Article | PDF ArticleMore Like This
M. L. Jakobsen, H. T. Yura, and S. G. Hanson
Appl. Opt. 51(9) 1396-1406 (2012)
Michael L. Jakobsen, Theis F. Q. Iversen, Harold T. Yura, and Steen G. Hanson
Appl. Opt. 50(28) 5577-5591 (2011)
Theis F. Q. Iversen, Michael L. Jakobsen, and Steen G. Hanson
Appl. Opt. 50(11) 1523-1533 (2011)