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Optical interference profiler having shadow compensation

  • US 6,147,764 A
  • Filed: 03/31/1999
  • Issued: 11/14/2000
  • Est. Priority Date: 04/03/1998
  • Status: Expired due to Term
First Claim
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1. An optical interference measurement device for optically measuring an interference of a target workpiece to be held in a machining device and machined by a machine tool, said optical interference measurement device comprising:

  • a machine tool having a measurement window which penetrates the machine tool;

    interference image formation means for irradiating the machine tool with measurement light from the side opposite to the workpiece to capture a plurality of optical interference images which are present in the range including said measurement window and which have different positional relationships between the workpiece and the measurement window; and

    image processing means for synthesizing the fringe images of the workpiece obtained in the measurement window area of said plural optical interference images to form a synthesized interference fringe image in which the interference fringe images are consecutive within a predetermined measurement range;

    said image processing means eliminating the shadow of the machine tool from the optical interference image on the basis of a reference tool shadow intensity which is the reference size of the optical intensity of the tool shadow corresponding to the tool section in the optical interference image to form said synthesized interference fringe image.

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