Nonlinear Calibration of an Infrared Radiometer.
NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD
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At best, the calibration of an infrared radiometer, also known as a Forward Looking Infrared FLIR system, is a complex procedure. Effective calibration must 1 be tailored to the actual radiometer being studied, 2 be carried out to each of the many subsystems involved, 3 relate internal system parameters to physical quantities familiar to the infrared community, and 4 be revisited at some interval to ensure that it is still valid. The details of some of the ideas that form the basis for a valid calibration of the GEC Avionics Ltd Dual Waveband Imaging Radiometer FLIR are discussed. The need for the removal of a systematic error due to magnification optics emission, as described by Braim, is emphasized. Another systematic error, associated with an analysis of FLIR gray scale response based upon linear interpolation from reference temperatures, is examined. A novel method of nonlinear interpolation is presented that is aimed at the reduction or elimination of systematic calibration errors.
- Infrared Detection and Detectors