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Apparatus and method for determining precision reflectivity of highway signs and other reflective objects utilizing an optical range finder instrument

  • US 6,212,480 B1
  • Filed: 01/25/2000
  • Issued: 04/03/2001
  • Est. Priority Date: 07/27/1998
  • Status: Expired due to Term
First Claim
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1. A method of measuring an absolute coefficient of retroreflectance for a reflective surface utilizing a signal transmitting and receiving range finder comprising the steps of:

  • providing a reference reflectance factor in said range finder for an unknown target retroreflective surface;

    measuring a power attenuation factor for an unknown target;

    calculating a coefficient of retroreflectance of said unknown target from said measured power attenuation factor and said reference reflectance factor.

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