Process and apparatus for the determination of the physical char

Details Process and apparatus for the determination of the physical char Process and apparatus for the determination of the physical char

1979-02-14

1981-07-14

Corbin, John K.

G03H 130

Patent

active

042783194

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.

REFERENCES:
patent: 3520610 (1970-07-01), Parrent, Jr. et al.
patent: 3785712 (1974-01-01), Hannan
patent: 3838903 (1974-10-01), Leith et al.

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