Rapid Sampling of Acoustic Holograms by Laser-Scanning Techniques

Abstract

The paper discusses a technique in which a laser flying spot scanner is used to record an acoustic hologram by reading out the periodic deformations of a solid surface caused by an incident sound field. The technique is compared with the Sokolov tube method and shown to have comparable sensitivity, while not being restricted to low frequencies and small areas. A description is given of experiments using sound frequencies of 2 and 9 MHz, and photographs are presented showing holograms and reconstructions obtained with this technique.