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Measuring method and apparatus

  • US 5,220,536 A
  • Filed: 02/28/1992
  • Issued: 06/15/1993
  • Est. Priority Date: 09/01/1989
  • Status: Expired due to Term
First Claim
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1. A method of determining the actual dimensions of a linearly moving object of substantially rectangular cross-section in the horizontal plane, the sides of which object are in non-parallel relationship to the direction of travel, comprising:

  • linearly moving said object at a constant speed;

    determining the apparent length of said object by measuring the travel time thereof past a first point on the line of object travel and multiplying said travel object travel time by said constant speed;

    determining the apparent width of said object by sensing the positions of the outermost corners of the object, taken in a direction perpendicular to said direction of object travel, and computing the distance between said outermost corners in said perpendicular direction;

    determining a distance taken in the path of object travel between one of said outermost corners and the trailing edge of said object by measuring the travel time between the passage of said outermost corner and that of said trailing edge past a second common point on the line of object travel and multiplying said corner to trailing edge travel time by said constant speed; and

    calculating the actual length and width of said object utilizing said determined apparent length, apparent width, and outermost object corner to trailing edge distance.

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