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ON-BOARD NON-UNIFORMITY CORRECTION CALIBRATION METHODS FOR MICROBOLOMETER FOCAL PLANE ARRAYS

  • US 20120211648A1
  • Filed: 02/11/2012
  • Published: 08/23/2012
  • Est. Priority Date: 02/21/2011
  • Status: Active Grant
First Claim
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1. A method of calibrating a microbolometer focal plane array (MFPA) having detector elements and that resides in a thermal camera that has a processing unit that is operably coupled to an external computer, comprising:

  • a) determining reference and detector non-uniformity corrections (NUCs) in the processing unit based on reference voltages from the MPFA, and applying the reference and detector NUCs to the detector elements as coarse corrections that establish a coarse calibration, and sending the reference and detector NUCs to the external computer;

    b) in a first measurement step, collecting image data DL1 and DH1 at respective first ambient and first calibration temperatures, and collecting image data DL2 and DH2 at respective second ambient and second calibration temperatures, and sending image data DL1, DH1, DL2 and DH2 to the external computer;

    c) calculating in the external computer fine corrections based on the collected image data DL1, DH1, DL2 and DH2 and the reference and detector NUCs; and

    d) sending the fine corrections from the external computer to the processor unit and applying the fine corrections to the detector elements to establish a fine calibration.

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