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Safety system for contactless measurement of paths and/or speeds

  • US 7,995,192 B2
  • Filed: 12/29/2008
  • Issued: 08/09/2011
  • Est. Priority Date: 01/28/2008
  • Status: Active Grant
First Claim
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1. An optoelectronic safety sensor for the contactless measurement of paths and/or speeds of the safety sensor or of a first object connected in a fixed position to the safety sensor with respect to a second object moved relative to the first object wherein the objects form a potential source of danger on movement, the optoelectric safety sensor comprising:

  • a light source;

    a light receiver having a plurality of light reception elements;

    an evaluation unit configured to determine at least one of a path and a speed of a surface structure with respect to a second object, using at least one of an optical correlation process and an evaluation of an optical flow from at least two images of the surface structure taken sequentially by the light receiver, wherein;

    the evaluation unit is further configured to evaluate a quality of the at least one determined path and determined speed; and

    the evaluation unit is operably connected to a safety output via which the evaluation unit is configured to output a shutdown signal or brake signal when an evaluated quality falls below a predetermined threshold.

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