Process and apparatus for the determination of the physical characteristics of dispersed systems by holography
US4278319A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1979 |
| Grant date | Jul 14, 1981 |
| Priority date | — |
| Expiry date | Feb 14, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2001/0471
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.