Contactless optical process for identifying objects

US4921352A · kind A · utility

Assignee

• Fried Krupp · DE

Inventors

• Friedhelm Adolfs · Ratingen, DE
• Gerd Bittner · Bottrop, DE
• Klaus P. Busing · Datteln, DE
• Stephen C. Harris · Palo Alto, US
• Ulrich Hahn · Dortmund, DE
• Martin Wurzburger · Essen, DE

Key dates

• Filing date: Nov 20, 1987
• Grant date: May 1, 1990
• Expiry date: Nov 20, 2007

Classification

• Technology area (CPC G): Physics
• CPC primary: G03H1/00
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A contactless optical process with which characteristics such as the type, position, deformation, and vibration spectrum, of an object can determined and/or measured. In this process, coherent light is changed by an optical medium fixed to the object. Suitable optical media, such as acousto-optical transducers or special holograms, are selected for the respective characteristics. A photosensitive receiver equipped with evaluation means determines the respective characteristics of the object from the changes in the coherent light caused by these optical media.