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Method and system for three-dimensional spatial position detection of surface points

  • US 6,175,647 B1
  • Filed: 05/22/1998
  • Issued: 01/16/2001
  • Est. Priority Date: 05/26/1997
  • Status: Expired due to Fees
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1. A system for a measured 3D spatial position detection of surface points of an object to be measured in a photogrammetric online system, comprising:

  • a probe for mechanically touching a surface measurement point by means of a probe tip;

    at least two electronic cameras rigidly connected to the probe for determining a 3D spatial position of the probe tip, at the instant of touching, with respect to a reference system;

    wherein said reference system being designed as a stationary target canopy which spans in three dimensions and completely covers the volume containing the object to be measured, at a distance from the object to be measured;

    wherein said electronic cameras being arranged peripherally offset with reference to a peripheral line about a probe axis and being directed at the target canopy, wherein an optical axis of each electronic camera forms an acute angle α

    of a same amount with the probe axis and;

    wherein the target canopy has a plurality of reference points of known spatial positions that are distributed over the three dimensional target canopy and the reference points can be optically distinguished from each other, and wherein the reference points on the target canopy are arranged close together so that each of the electronic cameras detects three reference points simultaneously, and a computer, connected to the electronic cameras, which automatically evaluates images communicated by the cameras and determines the 3D spatial position of the probe tip in the reference system, at the instant of touching.

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