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Support structure detection

  • US 10,444,012 B2
  • Filed: 11/25/2014
  • Issued: 10/15/2019
  • Est. Priority Date: 03/30/2012
  • Status: Active Grant
First Claim
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1. A method of locating a garter spring external to a pressure tube, said method comprising:

  • receiving, from a measurement device in said pressure tube, a plurality of data points, where said receiving includes receiving a data point representative of a diameter of said pressure tube at each of a plurality of angular offsets for a first range of axial positions in said pressure tube;

    fitting a shape to said plurality of data points;

    determining an integrated residual error between said data points and said shape;

    associating said integrated residual error with said first range of axial positions;

    repeating said receiving, fitting, determining and associating for a further plurality of axial positions, thereby producing a plurality of integrated residual errors;

    applying a digital filter to said plurality of integrated residual errors, thereby producing a plurality of filtered integrated residual errors; and

    indicating, as a location of said garter spring, an axial position associated with a local maximum filtered integrated residual error among said plurality of filtered integrated residual errors.

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