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Proceedings Paper

Space-time correlation properties and their applications of dynamic speckles after propagation through an imaging system and double-random modulation
Author(s): Shining Ma; Ying Liu; Fuli Du
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Paper Abstract

The statistical properties of a dynamic speckle field produced by a cascade of two thin diffusers (one moving and one static) which are placed at conjugate planes of an imaging system have been investigated both theoretically and experimentally. We find that the linear dependence of the reciprocal l/rc of the time-correlation length on the velocity of the moving diffuser is still hold in this case, and that because the speckle field has a higher time-varying rate of intensity fluctuations, the measuring time can be reduced greatly, i.e. this speckle field is more sensitive to the motion of the diffuser than when using normal speckles produced by a single moving diffuser. An experimental study has been conducted to verify the theoretical results, and good agreements are obtained.

Paper Details

Date Published: 1 December 1991
Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991); doi: 10.1117/12.49508
Show Author Affiliations
Shining Ma, Tianjin Univ. (China)
Ying Liu, Tianjin Univ. (China)
Fuli Du, Tianjin Univ. (China)

Published in SPIE Proceedings Vol. 1554:
Second International Conference on Photomechanics and Speckle Metrology
Fu-Pen Chiang; Fu-Pen Chiang, Editor(s)

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