Experimental Implementation of Advanced Processing in Acoustic Holography

Abstract

Two advanced spatial-processing techniques, one of which was analyzed at an earlier symposium, have been implemented experimentally, with interesting results. The previously described weak-signal enhancement technique (WSET) has been shown experimentally to be insensitive to phase-errors, as predicted, and to work well in certain circumstances. In other circumstances, however, the WSET is appreciably less effective and the reasons for this are presented. A second and more recent processing technique is adaptive in nature and removes strong highlights, together with the energy in the associated subsidiary maxima due to the pointspread function of the aperture. This approach, in which the reconstruction minicomputer automatically optimizes the highlight removal, has also been tested experimentally, with excellent results.

Work supported in part by the Office of Naval Research under Contract N00014-73-C-0258.