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Laser-based measurement system

  • US 4,895,440 A
  • Filed: 08/22/1988
  • Issued: 01/23/1990
  • Est. Priority Date: 08/22/1988
  • Status: Expired due to Term
First Claim
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1. A laser beam measurement system, comprising:

  • a transmitter at one position which produces a laser reference plane by sweeping a laser beam about the transmitter;

    a receiver located at a position remote from said transmitter which receiver intercepts the laser reference plane;

    reflector means at said receiver for reflecting said laser beam back to said transmitter when the laser beam sweeps past said receiver;

    first means at said transmitter for sensing said laser beam reflected back to said transmitter from said receiver;

    azimuth means at said transmitter, responsive to said first means, for providing electrical angle signals indicative of the angle at which said receiver is positioned with respect to a reference axis that extends from said transmitter;

    second means at said transmitter, responsive to said first means, for causing said transmitter to modulate said beam in response to sensing of said laser beam reflected back to said transmitter by said reflector means; and

    third means at said transmitter, responsive to said first means and said second means, for producing an electrical signal indicative of the period of time between said modulation and the sensing by said first means of such modulation of said laser beam reflected back to said transmitter, said time period being indicative of the range of said receiver from said transmitter.

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