Biocontamination and particulate detection system

Details Biocontamination and particulate detection system Biocontamination and particulate detection system

1978-02-24

1979-07-10

Evans, F. L.

Optics: measuring and testing

By shade or color

Photography

356237, G01N 2132, G01J 348

Patent

active

041606019

ABSTRACT:
A method for determining the characteristics and amount of microscopic contaminants lodged on a photographed surface. An image enhanced full-color photographic negative and print are taken of the contaminated surface. Three black-and-white prints are developed subsequently from red, green and blue separation filter overlays of the color negative. Both the color and three monochromatic prints are then scanned to extract in digital form a profile of any contaminant possibly existing on the surface. The resulting profiles are electronically analyzed and compared with data already stored relating to known contaminants.

REFERENCES:
patent: 2550648 (1951-04-01), Sweet
patent: 2582073 (1952-01-01), Scudda
patent: 2982169 (1961-05-01), Enright
patent: 3339451 (1967-09-01), Shaifer
patent: 3449053 (1969-06-01), Cannady et al.
patent: 3702734 (1972-11-01), Lindahl et al.
IBM Technical Disclosure Bulletin, vol. 16, No. 1, Jun. 1973, "Surface Contamination Particle Counter", p. 212, (Hopkins et al.).
IBM Technical Disclosure Bulletin, vol. 12, No. 2, Jul. 1969, "Scanning Registration Densitometer", pp. 276-277, (Abramson).
The Review of Scientific Instruments, vol. 36, No. 1, Jan. 1965, "Scanning Microscope Densitometer," pp. 31-33, (Hartman).

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