Space-time correlation properties and their applications of dynamic speckles after propagation through an imaging system and double-random modulation

Shining Ma; Ying Liu; Fuli Du

doi:10.1117/12.49508

1 December 1991 Space-time correlation properties and their applications of dynamic speckles after propagation through an imaging system and double-random modulation

Shining Ma, Ying Liu, Fuli Du

Author Affiliations +

Proceedings Volume 1554, Second International Conference on Photomechanics and Speckle Metrology; (1991) https://doi.org/10.1117/12.49508
Event: San Diego, '91, 1991, San Diego, CA, United States

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.

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Shining Ma, Ying Liu, and Fuli Du "Space-time correlation properties and their applications of dynamic speckles after propagation through an imaging system and double-random modulation", Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991); https://doi.org/10.1117/12.49508

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