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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

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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.

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Authors and Affiliations

  1. Stress Analysis, IIT Research Institute, Chicago, Ill.

    R. E. Rowlands (Research Engineer and Manager) & C. E. Taylor (Professor)

  2. University of Illinois, Urbana, Ill.

    I. M. Daniel

Authors
  1. R. E. Rowlands
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  2. C. E. Taylor
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  3. I. M. Daniel
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Rowlands, R.E., Taylor, C.E. & Daniel, I.M. A multiple-pulse ruby-laser system for dynamic photomechanics: Applications to transmitted- and scattered-light photoelasticity. Experimental Mechanics 9, 385–393 (1969). https://doi.org/10.1007/BF02327003

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  • DOI: https://doi.org/10.1007/BF02327003

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