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Wide dynamic range non-uniformity compensation for infrared focal plane arrays

  • US 5,420,421 A
  • Filed: 10/12/1994
  • Issued: 05/30/1995
  • Est. Priority Date: 12/07/1992
  • Status: Expired due to Term
First Claim
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1. A method for non-uniformity compensation for an infrared imaging device having a plurality of detector elements arranged in a focal plane array, said method comprising a calibration operation and a correction operation,said calibration operation comprising measuring a plurality of first responses that are generated by each of said plurality of detector elements to each of a plurality of known signal flux levels of infrared radiation over a wide range;

  • generating a corresponding data set of first responses for each of said plurality of detector elements in said focal plane array;

    storing each said corresponding data set of first responses for each of said plurality of detector elements in a data storage location; and

    transposing each of said plurality of known signal flux levels of infrared radiation to other values according to a predetermined relationship; and

    said correction operation comprising measuring a second response that is generated by each of said plurality of detector elements in said focal plane array to at least one unknown signal flux level of infrared radiation that is produced by at least one object in a field of view;

    comparing each said second response with each said corresponding data set of first responses for each of said plurality of detector elements in said focal plane array;

    interpolating within each said corresponding data set of first responses for each of said plurality of detector elements in said focal plane array to determine a compensated output corresponding to said unknown signal flux level of infrared radiation detected by each of said plurality of detector elements in said focal plane array.

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