The scanning technique of the previous paper permits the visual observation, by photographic recording, of the two basic phenomena of holography, namely, wave interference and wave diffraction. Examples are presented and discussed to explain both the hologram concept and the recent medical development in acoustic holography which provides a real‐time, x‐ray‐like visual presentation of bone structures and tumors in the human body. [References: the author's books, Seeing Sound (Wiley, New York, 1971); Lasers and Holography (Doubleday, New York, 1969); and Acoustic Holography, in the forthcoming Vol. 10 of Physical Acoustics (Academic, New York).]
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© 1974 Acoustical Society of America.
1974
Acoustical Society of America