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Calibrating radiometers

  • US 6,900,756 B2
  • Filed: 02/21/2002
  • Issued: 05/31/2005
  • Est. Priority Date: 02/21/2001
  • Status: Active Grant
First Claim
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1. A method of improving the image quality of a multi-channel imaging radiometer having at least a first channel which detects radiation using a first detector and a second channel which detects radiation using a second detector, the method comprising modifying the gain and/or offset used in the scene-temperature vs detector voltage equations for the first and second channels using values for the gain and offset derived by performing a channel calibration operation, and in that channel calibration operation ensuring that the first and second channels observe substantially the same temperature and using the outputs from the first and second detectors in the calibration operation to produce a modified value for the gain and/or offset for the first and/or second channel;

  • the radiometer using the modified gain and/or offset for the first and/or second channel to create an image using the first and second channels.

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