High-speed laser speckle photography. Part 2: rotating mirror camera control system and applications

Jonathan Mark Huntley; John E. Field

doi:10.1117/12.168543

1 May 1994 High-speed laser speckle photography. Part 2: rotating mirror camera control system and applications

Jonathan Mark Huntley, John E. Field

Author Affiliations +

Optical Engineering, Vol. 33, Issue 5, (May 1994). https://doi.org/10.1117/12.168543

Abstract

A rotating mirror camera and pulsed ruby laser have been combined to record laser speckle photographs at framing rates in the range of 10⁵ to 10⁶ frames/s. The laser is repetitively Q-switched by means of a Pockels cell, which is controlled by photodetectors inside the camera. This allows well-correlated , double-exposu re speckle photographs to be recorded on two separate runs of the camera. The photographs are analyzed by an automated image processing system to give whole-field displacement data with submicron accuracy. The illustrations show the dynamic displacement field in polymethyl methacrylate due to solid particle impact. The camera/laser system has potential applications for other stress analysis techniques, such as photoelasticity, the method of caustics, and moiré interferometry.

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Jonathan Mark Huntley and John E. Field "High-speed laser speckle photography. Part 2: rotating mirror camera control system and applications," Optical Engineering 33(5), (1 May 1994). https://doi.org/10.1117/12.168543

Published: 1 May 1994

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