Abstract

A new high-resolution technique for remote surface contouring is proposed. Two photographic recordings of the object scene are made on separate plates. Between the two recordings, either the object or the recording camera is shifted laterally with respect to the optical axis by a known amount. The resultant relative relief displacement due to surface height distribution is accurately measured by a cross-correlation speckle technique. It is shown that a surface height resolution of the order of 50 μm is achieved at a distance of 1 m. The principle involved, experimental details, results, resolution of the method, and criteria for attaining better resolution, are discussed.

© 1984 Optical Society of America

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