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Method and apparatus for distance measurement

  • US 7,645,974 B2
  • Filed: 03/27/2008
  • Issued: 01/12/2010
  • Est. Priority Date: 03/27/2007
  • Status: Active Grant
First Claim
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1. A method for measuring a distance from a measurement apparatus to an object, comprising:

  • emitting a modulated light having a predetermined frequency and period towards a space in which measurement of the distance from the measurement apparatus to the object is desired;

    receiving an incoming light including a reflex light reflected from the object;

    converting the incoming light into a plurality of charges during each of four terms in one period of the modulated light;

    calculating each phase difference between the modulated light and the incoming light based on each of the plurality of charges during and corresponding to each of the four terms in the one period of the modulated light;

    calculating a distance from the measuring apparatus to the object using information related to the plurality of charges and each phase difference; and

    adjusting a light intensity of the modulated light in accordance with information related to the plurality of charges converted from the incoming light.

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