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Electromagnetic digitizer

  • US 4,845,503 A
  • Filed: 02/05/1988
  • Issued: 07/04/1989
  • Est. Priority Date: 02/05/1988
  • Status: Expired due to Fees
First Claim
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1. An apparatus for digitally determining the spatial orientation of planar and linear structures exhibited in a three-dimensional body, comprising:

  • (a) means for rotating said body about a longitudinal axis;

    (b) means coupled to said means for rotating, for measuring a rotation angle and rotation direction of said body about the axis;

    (c) means for generating orthogonal electromagnetic fields encompassing said body to define a spatial coordinate frame;

    (d) means for tracing said structures on said body to be digitally determined within the spatial coordinate frame;

    (e) means for detecting each of said orthogonal electromagnetic fields at a plurality of point along a trace, said detecting means mounted on said tracing means; and

    (f) analyzing means for energizing said means for sequentially generating the orthogonal electromagnetic fields, and for receiving an output from said detecting means and converting the output into a spatial coordinate.

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