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Process and apparatus for automatically determining the modulation transfer function of focal plane array cameras

  • US 20030086079A1
  • Filed: 10/31/2002
  • Published: 05/08/2003
  • Est. Priority Date: 10/31/2001
  • Status: Active Grant
First Claim
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1. A process for the automatically determining a modulation transfer function of focal plane array cameras, said method comprising:

  • providing a test grid, having an image with a spatial frequency in the detector plane that is detuned with respect to the Nyquist frequency or a rational fraction of the Nyquist frequency, of a detector array of said camera;

    using said test grid to generate a beat whose amplitude correspond to amplitude of the grid image to be measured, without the sampling the modulation transfer function;

    wherein the test grid covers a range of at least half a beat period;

    regardless of actual phase position, the modulation amplitude is determined therefore.

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