Apparatus and method for measuring optical characteristics of an object

  • US 6,307,629 B1
  • Filed: 03/12/1999
  • Issued: 10/23/2001
  • Est. Priority Date: 08/12/1997
  • Status: Expired due to Term
First Claim
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1. A method of determining a characteristic of an object or material comprising the steps of:

  • receiving light from the object or material;

    coupling received light to one or more sensors;

    generating at least one signal having a frequency proportional to the light intensity received by the one or more sensors; and

    determining the characteristic based on the at least one signal;

    wherein the light passes through a filter prior to being coupled to one or more of the sensors.

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