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Method and device for measuring distance optically

  • US 4,881,809 A
  • Filed: 07/14/1987
  • Issued: 11/21/1989
  • Est. Priority Date: 07/22/1986
  • Status: Expired due to Term
First Claim
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1. Optical process for measurement of a distance between a hunter and a target, comprising the steps of:

  • (a) sending substantially monochromatic light pulses from the hunter toward the target;

    (b) collecting light echoed by the target on a matrix detector having photosensitive sites distributed in lines and columns with line-by-line transfer read-out(c) carrying out said transfer read-out in the direction of the columns at a first predetermined frequency during the time of flight between sending and return of the reflected echo from said target;

    (d) repeating the sequence of steps (a), (b) and (c) with another predetermined transfer frequency, different from the first frequency; and

    (e) deriving the distance from the distance between lines of the matrix having received the echo for the two different frequencies.

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