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Systems and methods that detect changes in incident optical radiation

  • US 7,423,279 B2
  • Filed: 10/23/2003
  • Issued: 09/09/2008
  • Est. Priority Date: 10/23/2002
  • Status: Active Grant
First Claim
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1. A method for detecting changes in a spatially nonuniform optical intensity distribution, comprising:

  • driving current through one or more areas of photoconductive material of a detector, by means of at least one pair of first electrical contacts to source and sink the current, the at least one pair of first electrical contacts beyond each of the one or more areas of a photoconductive material, while incident optical radiation illuminates the one or more areas of photoconductive material; and

    measuring the voltage across one or more of the areas of photoconductive material using at least two second electrical contacts that are different than the at least one pair of first electrical contacts, a change in the measured voltage being indicative of a change in illumination.

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