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


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.


Fluid Dynamics Repetition Rate Pulse Width Stress Analysis Ruby 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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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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