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Process and device for detecting and evaluating surface cracks in workpieces

  • US 5,047,851 A
  • Filed: 02/26/1990
  • Issued: 09/10/1991
  • Est. Priority Date: 09/23/1987
  • Status: Expired due to Fees
First Claim
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1. A device for detecting and evaluating surface cracks in workpieces, comprising:

  • workpiece handling means for holding a workpiece;

    a color television camera provided so as to view the workpiece held in the handling means, the camera having an optical filter adapted to light emanating from a crack representation agent, the camera producing a picture output including the colors red, green and blue;

    a color-mixing unit connected to the camera output for mixing the colors and producing a corresponding output;

    an analog-digital signal converter provided as to convert the output of the color-mixing unit;

    a digital picture processing unit having a picture store, the processing unit being provided so as to receive the converted output; and

    a computer unit arranged so as to prepare and evaluate digital picture levels and having a control output connected to the workpiece handling device.

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