By Byron B. Brenden (auth.), Glen Wade (eds.)
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Extra resources for Acoustic Imaging: Cameras, Microscopes, Phased Arrays, and Holographic Systems
JECT SOUND SOURCE MR REFERENCE BEA/1 INPUT POWER TO TRANSDUCER Fig. _ _ Tr_ SOUNJJ SOURCE FOR OBJECT BEAM INPUT POWER TO TRANSlJUCER Liquid-surface holographic system. Static ripples on the liquid-air interface constitute a record of the interference between the object and reference beams and permit the rippled liquid surface to operate as a hologram in real time. 36 CHAPTER 2 a beam of laser light. Thus the ripple pattern on the liquid surface becomes the hologram of the object. The zero-order light and one of the diffraction side bands are eliminated by an optical spatial filter before the image is further processed for viewing.
Langevin, a major French physicist, had widely ranging interests and had previously studied X rays, relativity, para-magnetism, dia-magnetism, ionic transport, and thermodynamics, among other scientific topics. Although he concerned himself mainly with philosophical questions, he did not neglect the technological implications of his work. One of the practical problems faced by the French during World War I was how to detect submerged enemy submarines, and Langevin was asked to find a way to do so.
Lasers, of course, were not available to Sokolov, and his light source was not as coherent as he might have wished. However, the absence of a second source does not change the character of the operation of the system in any fundamental way. Even without the second sound source, the formation of static ripples could be expected to take place on the oil surface of the system in such a way as to form a hologram. Flaws of sufficiently small dimensions would obviously permit the passage of a substantial portion of undisturbed sound through the metal piece.