Calibrating focal plane arrays using multiple variable radiometr

Details Calibrating focal plane arrays using multiple variable radiometr Calibrating focal plane arrays using multiple variable radiometr

1992-12-07

1994-10-11

Hannaher, Constantine

Radiant energy

Calibration or standardization methods

250330, G01D 1800

Patent

active

053549872

ABSTRACT:
A method and system for calibrating focal plane arrays wherein a reference source is periodically disposed between the scene and the detectors so that response measurements can be made at three or more different controlled flux levels. In a first embodiment, a passive infrared reference is used with multiple discrete reflectivity levels. By varying the reflectivity of passive sources during construction, the detectors see some portion of the self-emission of the source and some portion of the detector cryostat temperature. This information is used to obtain accurate calibration. A second embodiment uses continuously varying passive infrared references. Third and fourth embodiments replace the passive discrete and passive continuous infrared sources with active sources. Signal processing is provided to interpolate between the reference measurements.

REFERENCES:
patent: 3612879 (1971-10-01), Ohman
patent: 3986384 (1976-10-01), Giorgi
patent: 4387301 (1983-06-01), Wirick et al.
patent: 4965448 (1990-10-01), Morse et al.

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