Radiant energy – Calibration or standardization methods
Patent
1992-12-01
1994-04-12
Hannaher, Constantine
Radiant energy
Calibration or standardization methods
250332, 250334, G01J 500
Patent
active
053028244
ABSTRACT:
An imaging system including a scanning linear detector array is calibrated with the aid of a source of radiation to provide uniformity in gain among the various detectors of the array. A first memory is provided for storing a map of the source obtained by a scanning through a succession of parallel line scans by means of a single one of the detectors, the detector array being offset between the successive line scans to enable the single detector to perform all of the line scans. A second memory is provided to store an image of the source provided by a scanning by all of the detectors along their respective scan lines. The data obtained in each line scan in each of the memories is averaged. Then, the average value for a scan line stored in the second memory is divided by the average value of the same scan line appearing in the first memory to provide a ratio for each scan line. The ratio is the gain of the detector of the scan line relative to the gain of the first detector. The mapping allows equalization of the gains for eliminating the effect of nonuniformities of the test source from the resultant calculation of the relative detector gains.
REFERENCES:
patent: 4873442 (1989-10-01), Klatt
patent: 4876453 (1989-10-01), Wirick
patent: 5134474 (1992-07-01), Hanafusa et al.
Denson-Low Wanda K.
Hannaher Constantine
Hughes Aircraft Company
Sales Michael W.
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