Abstract
DUAL-plate holographic interferometer system of unique capability has been reported.! The basic scheme is an extension of the system enumerated in Refs. 2 and 3. These systems differ from the conventional holographic interferometers in that they store the reference and scene wave-fronts on separate holograms, and the interferometric image is not created until reconstruction. The dual-plate approach has several advantages over the traditional single plate dual-exposure method. They include insensitivity to mechanical vibration, availability of Schlieren and shadowgraph images from the same holograms generating the interferograms, and the ability to arbitrarily position the interference fringes during reconstruction. It will be demonstrated that the ability to arbitrarily maneuver fringes during reconstruction is essential to the quantitative practical application of interferometry.
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