Optics: measuring and testing – Inspection of flaws or impurities – Having predetermined light transmission regions
Patent
1992-07-14
1994-12-27
Warden, Robert J.
Optics: measuring and testing
Inspection of flaws or impurities
Having predetermined light transmission regions
356371, 356426, 250572, G01N 2100
Patent
active
053770021
ABSTRACT:
This apparatus permits the non-destructive examination of entire surfaces for defects and contamination, and can detect microscopically small dot-shaped and linear defects and extremely fine macroscopic non-homogeneous areas. For this purpose, an adjustable lens system (5) is placed in the optical path between light source (2) and objective (9) which produces various intermediate images (31). A first cigar-shaped intermediate image is used for the first scan of the whole of the surface at a relatively large feed offset, and a second dot-shaped intermediate image is used for a second scan of partial areas of the surface at a small feed offset.
A dark-field stop assembly (18) with an adjustable dark-field deflection system (8) is placed in the optical path between the lens system (5) and the objective (9), which projects the light beam (1) after deflection exactly centered at right angles through the objective (9) upon the surface of the object (10). The light reflected by the surface (10) and collected by the objective (9) is projected to a photo detector. An electronic analysis system (21) breaks down the amplified output signals from the photo detector (19) into measured values due to dot-shaped, linear, and planiform defects. The electronic analysis system (21) is connected via a computer unit (22) to peripheral equipment (23, 24, 25) which permits the representation of all the measured values obtained in a measuring cycle.
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Auderset Heinrich
Malin Comas
Nesensohn Thomas
Sawatzki Harry L.
Schmid Gert
Tet Techno Trust Investment Settlement
Tran Hien
Warden Robert J.
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