Experimental Mechanics

, Volume 9, Issue 9, pp 385–393 | Cite as

A multiple-pulse ruby-laser system for dynamic photomechanics: Applications to transmitted- and scattered-light photoelasticity

Paper describes a new ultrahigh-speed multiple-frame recording system in which a ruby laser is sequentially modulated and the light pulses are synchronized with the camera and event
  • R. E. Rowlands
  • C. E. Taylor
  • I. M. Daniel
Article

Abstract

An ultrahigh-speed multiple-frame recording system for two- and three-dimensional dynamic photomechanics has been developed and is described here. The output from a ruby laser is modulated with a Pockels cell to produce a train of short, intense, monochromatic and polarized light pulses. Pulse widths of 50 nsec and repetition rates of up to 170,000 pulses/sec are obtained. These light pulses are synchronized with a “smear camera” and the event to produce a multiple-frame record of the phenomenon. The simplified camera requirements necessary for this purpose are indicated. The system is demonstrated by recording two-dimensional dynamic and scattered-light isochromatic fringe patterns. The capability of multiple recording of scattered-light fringe patterns, achieved here for the first time, has a tremendous potential for three-dimensional dynamic stress analysis. The developed system is also well suited for dynamic moiré, interferometry and holography.

Keywords

Fluid Dynamics Repetition Rate Pulse Width Stress Analysis Ruby 

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Copyright information

© Society for Experimental Mechanics, Inc. 1969

Authors and Affiliations

  • R. E. Rowlands
    • 1
  • C. E. Taylor
    • 1
  • I. M. Daniel
    • 2
  1. 1.Stress AnalysisIIT Research InstituteChicago
  2. 2.University of IllinoisUrbana

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