Self-calibrating precision timing circuit and method for a laser range finder

  • US 6,226,077 B1
  • Filed: 02/25/2000
  • Issued: 05/01/2001
  • Est. Priority Date: 01/19/1995
  • Status: Expired due to Term
First Claim
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1. A laser range finder comprising:

  • a laser transmitting section for producing a series of transmitted laser pulses directable towards a target and producing a plurality of returned laser pulses at least partially reflected therefrom in response thereto;

    a laser receiving section for receiving said plurality of returned laser pulses and noise pulses, said laser receiving section comprising a laser signal receiving device coupled to an input of a transimpedance amplifier, said transimpedance amplifier providing an amplified output signal of said laser signal receiving device for input to a comparator circuit for providing an automatic noise threshold adjustment to said laser receiving section to facilitate discrimination between said returned laser pulses and said noise pulses;

    a central processing section coupled to said laser transmitting and laser receiving sections for determining a distance to said target based on a time of flight of said transmitted and returned laser pulses; and

    a user viewable display coupled to said central processing section for displaying said distance to said target.

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