Some observations on the direct comparison of the geometry of two objects using speckle pattern interferometric contouring

Abstract

It is theoretically and experimentally established that speckle pattern interferometric contouring may be used to directly generate a fringe pattern which is a measure of the difference in geometry of two nominally identical nonspecular objects. The limitations and range of application of the technique are discussed and some basic considerations concerning the decorrelation of speckle patterns resulting from wavelength change are presented.