The diffractographic strain gage
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A method for measuring strain using diffraction of light from a single aperture is described, and results of a comparison tensile test with an electrical-resistance strain gage are presented. The “diffractographic strain gage” is shown to have high sensitivity, linearity, accuracy and temperature compensation and the ability to operate in a variety of hostile environments. It is furthermore simple, inexpensive, and the data can be collected by eye without assistance from further instrumentation.
[1] William N. Sharpe. Fringe patterns are produced by monochromatic light incident upon two small grooves on specimen surface. Strain is measured by recording fringe pattern motion , 1968 .
[2] C. E. Pugh,et al. Strain-field investigations with plane diffraction gratings , 1965 .
[3] William N. SharpeJr.. The interferometric strain gage , 1968 .