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System and method for determining the alignment quality in an illumination system that includes an illumination modulator

  • US 7,079,233 B1
  • Filed: 08/27/2003
  • Issued: 07/18/2006
  • Est. Priority Date: 08/27/2003
  • Status: Expired due to Fees
First Claim
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1. An alignment detection system for determining whether a modulated illumination field in an imaging system employing an illumination modulator is mis-aligned, said alignment detection system comprising:

  • modulator adjustment means for providing a test pattern on the illumination modulator;

    a detector for receiving a modulated illumination field from said illumination modulator;

    sampling means for determining at least two sample values (A and C) for each of two areas of said modulated illumination field respectively; and

    evaluation means for determining whether the value |A−

    C| is greater than a threshold value.

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