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Optical Multiwavelength Window Contamination Monitor for Optical Control Sensors and Systems

  • US 20090015824A1
  • Filed: 07/09/2008
  • Published: 01/15/2009
  • Est. Priority Date: 07/09/2007
  • Status: Active Grant
First Claim
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1. A foreign-particle detection system for use with an optical instrument having a transmissive window with a first side and a second side, the system comprising:

  • a radiation source to emit a radiation signal;

    a diffusing reflector to diffusively spread the radiation signal emitted by the radiation source over the first side of the transmissive window;

    a radiation detector to detect, at the second side of the transmissive window, the diffusively spread radiation signal transmitted by the transmissive window, and to generate a detected radiation signal based on the detected diffusively spread radiation signal; and

    a computation module communicatively coupled to the radiation detector to detect a presence of foreign particles on at least one of the first side or the second side of the transmissive window based on at least the detected radiation signal.

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