Tet Techno Trust Investment Settlement

Comas Malin

Edgar F Steigmeier

Heinrich Auderset

Harry L Sawatzki

Gert Schmid

Thomas Nesensohn

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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Mauren, Liechtenstein

Comas Malin