Physics
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995spie.2474..217p&link_type=abstract
Proc. SPIE Vol. 2474, p. 217-228, Smart Focal Plane Arrays and Focal Plane Array Testing, Marc Wigdor; Mark A. Massie; Eds.
Physics
Scientific paper
Intelligent decisions on the selection of infrared Focal Plane Arrays for sensor systems can only be made if testing of the individual detectors/arrays is carried out in a systematic and accurate manner. Devices are often tested several months apart, in different locations and under varying radiation conditions. This paper discusses various experimental methods that can be used to insure that consistent, accurate results are obtained. Radiometric parameters must be carefully controlled. Blackbodies make excellent reproducible infrared sources when used correctly, as they can be calibrated with simple thermocouples. Selection of blackbody temperature for various wavelengths of interest is important since measurements in a poorly chosen spectral region can translate minor blackbody temperature fluctuations into large errors in detector photon flux. Design of Dewar geometry is extremely important for low background measurements, as large errors can occur due to unwanted reflections or light leaks. The physical dimension of any limiting apertures must be measured precisely. Filter characterization must be accomplished for each filter or window used at the temperature of interest. With care, systematic and accurate measurements, and hence valid comparisons, can be made between detectors measured at different sites and times.
Duffey James R.
Purvis Raymond K.
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