Measuring method and apparatus

  • US 5,105,392 A
  • Filed: 03/18/1991
  • Issued: 04/14/1992
  • Est. Priority Date: 09/01/1989
  • Status: Expired due to Term
First Claim
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1. An apparatus for measuring a load, comprising:

  • a target field;

    a first plurality of downwardly facing ultrasonic sensors at a common distance above said target field and in laterally spaced mutual relationship;

    a second plurality of ultrasonic sensors in laterally spaced mutual relationship facing and disposed at a common distance from a first side of said target field;

    a third plurality of ultrasonic sensors in laterally spaced mutual relationship facing and disposed at a common distance from a second side of said target field parallel to said first side of said target field;

    a fourth plurality of ultrasonic sensors in laterally spaced mutual relationship facing and disposed at a common distance from a third side of said target field perpendicular to said first and second sides of said target field;

    through beam sensor means comprising a linearly extending beam emitter substantially parallel to said first side in alignment with a linearly extending receiver across said target field therefrom and substantially parallel to said second side of said therefor, said beam emitter and said receiver extending inwardly from the fourth side of said target field toward the third side thereof.

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