Apparatus for detecting deformations in pressed members

US5155371A · kind A · utility

Assignee

• Krupp Atlas Elektronik GmbH · DE

Inventors

• Hubert Burggraf · Oyten, DE
• Dirk Rathjen · Bremen, DE
• Rene Krupka · Schwäbisch Gmünd, DE

Key dates

• Filing date: Dec 17, 1990
• Grant date: Oct 13, 1992
• Expiry date: Dec 17, 2010

Classification

• Technology area (CPC G): Physics
• CPC primary: G01B11/24
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A device for detecting deformations in the surface of a workpiece includes a light source for illuminating the surface of the workpiece; a detector situated at a fixed predetermined distance from the light source and a displacing arrangement for effecting a relative movement between the workpiece and the light source. The detector comprises a photoreceiver for receiving reflected light from the workpiece and for generating a first output signal having a frequency dependent from the deformation of the workpiece. The photoreceiver is position-sensitive perpendicularly to a direction of the relative movement. A frequency analyzer is operatively connected to the receiver for receiving the first output signal from the photoreceiver and for generating a second output signal when the frequency of the first output signal exceeds a cutoff frequency. There is further provided a deformation indicator operatively connected to the frequency analyzer for receiving the second output signal therefrom and for indicating a deformation in the surface of a workpiece when the second output signal is received.