×

Method of measuring a distance

  • US 4,751,689 A
  • Filed: 04/21/1986
  • Issued: 06/14/1988
  • Est. Priority Date: 07/22/1985
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method of measuring a distance, comprising the steps of:

  • generating at least one starting pulse in the form of a radio-wave between a reference position and a position to be measured from said reference position;

    receiving said radio-wave at said position to be measured while simultaneously generating an ultra-sonic wave from said position to be measured, wherein a generally vertically upstanding pin is located at said position to be measured, said pin having an elongated bodyportion and a top end, said top end comprising an ultrasonic generator adapted to generate ultra-sonic waves downwardly, said pin further comprising a tapered reflector located directly below at least a portion of said ultra-sonic generator and comprising means for reflecting said ultra-sonic waves generated by said generator horizontally;

    determining a time difference between the moment of generating said starting pulse and another moment when said ultra-sonic wave is received; and

    multiplying said time difference by the velocity of sound in air.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×