Abstract
An optical technique based on transparent diffraction gratings is described by which the deflection contours of deformed, nearly flat plates may be obtained to any required sensitivity between 0.00005 in. and 0.010 in. The theory of diffraction gratings in reflection arrangements is given and the optical requirements to eliminate perspective distortion are outlined. Experimental verification using diffraction gratings containing 1000 lines per inch to give a deflection sensitivity of 0.00081 in./fringe shows the method to be reliable.
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