Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-07-21
1990-09-04
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250216, 356446, 356371, H01J 314, G01N 2186, G01N 2147
Patent
active
049547224
ABSTRACT:
A method and apparatus (10) for producing two-dimensional micrographs of overall surface microtopography of a given specimen (19) by using a photodetector (22) to measure the off-specularly reflected light from a focussed light beam (50) which is projected through a hemispherical mirror (20) onto the specimen surface as the specimen surface is scanned by the focused beam of light (50). Scanning can be accomplished either by moving the specimen surface (19) as a result of moving the sample holding member (18) or by moving the focused beam of light by means of a light beam deflection device (25).
REFERENCES:
patent: 4360275 (1982-11-01), Louderback
patent: 4423331 (1983-12-01), Koizumi et al.
patent: 4548506 (1985-10-01), Elson
patent: 4659229 (1987-04-01), Hernicz
patent: 4673818 (1987-06-01), Guerra
patent: 4815858 (1989-03-01), Snail
Fine Joseph
Marton Denes
Englert Alvin J.
Messinger Michael
Nelms David C.
The United States of America as represented by the Secretary of
Wright William H.
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