Abstract
THE formation of optical images by wave-front reconstruction as originated by Gabor1 and more recently extended by Leith and Upatnieks2 has made it possible to perform interferometry with light reflected or scattered from an irregular three-dimensional object3. Some of the possibilities of this method have been discussed in a previous publication4, and more recently Stetson and Powell6, Collier, Doherty and Pennington6 and Brooks, Heflinger and Wuerker7 have demonstrated several potential applications. This communication reports the successful achievement of multiple-beam as well as two-beam interferometry from the surfaces of standard engineering components. It would seem that many problems involving dilatation of a structure may be investigated in this way.
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