Process and apparatus for the determination of the physical characteristics of dispersed systems by holography
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United States of America Patent
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-
Jul 14, 1981
Grant Date -
N/A
app pub date -
Feb 14, 1979
filing date -
Dec 11, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved method for examining an at least partially transparent dispersed system which is trans-illuminated by a laser beam directed to a surface region of a photosensitive recording means is disclosed. The improvement is characterized by the steps of: producing a reference laser beam from the trans-illuminating laser beam before it passes through the dispersed system; directing the reference laser beam directly to a first portion of the surface region; optically recording the resulting interference pattern on the surface region, whereby the surface region comprises an off-line holographic record of the dispersed system in a first portion in which both the through-going and the reference laser beams are recorded and an in-line holographic record of the dispersed system in a second portion; and, reconstructing the in-line and off-line holographic records on disjunct fields of the region to provide appropriate, separately evaluable images of the dispersed system.
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