Device for testing components of transparent material for surface irregularities and occlusions

US4815844A · kind A · utility

Assignee

• Battelle Institute e.V. · DE

Inventors

• Harald Schmalfuss · Rodgau, DE
• Friedel Sinsel · Frankfurt, DE
• Reinhold Bolz · Frankenthal (Pfalz), DE

Key dates

• Filing date: Jun 15, 1987
• Grant date: Mar 28, 1989
• Expiry date: Jun 15, 2007

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2201/1045
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A device for testing components of transparent material for surface irregularities and occlusions which comprises a mechanism for rotatably mounting the component so that the component may be rotated on its axis; a mechanism for generating a light ray which moves linearly so that the light ray can dot-scan the component along a diameter of the component; at least one signal generating device disposed at a predetermined angle to the direction of impingement of the light ray for detecting surface irregularities and occlusions of the component and then generating a signal representative of the irregularity or occlusion; and a signal evaluation device for evaluating the signals produced in the signal generating device. The signal generating device comprises an image forming optical system; an interchangeable mask disposed at the focal plane of the image forming optical system for selecting the image of a plane of the component; and a receiver for receiving the light rays passing the mask and generating a signal representative of the light rays received.