Abstract
When an object coated with retroreflective paint is illuminated and imaged through a beamsplitter, a good lens system can resolve the individual beads in the paint to form high-contrast spots in a nearly black field. When the resulting photographs are converted to dichromated gelatin, the spots form microlenses that scatter light over a much wider angle than defined by the focal ratio of the lens. Treated as specklegrams, these photographs allow strain resolutions almost equivalent to laser-speckle photographs.
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References
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Stetson, K.A. Strain measurement using heterodyne photogrammetry of white-light specklegrams. Experimental Mechanics 25, 312–315 (1985). https://doi.org/10.1007/BF02325103
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DOI: https://doi.org/10.1007/BF02325103