Other
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984spie..483...84t&link_type=abstract
IN: Optical alignment II; Proceedings of the Meeting, Arlington, VA, May 3, 4, 1984 (A86-15271 04-35). Bellingham, WA, SPIE - Th
Other
Collimators, Earth Observations (From Space), Optical Scanners, Spaceborne Telescopes, Thematic Mapping, Computer Techniques, Focal Plane Devices, Histograms, Instrument Errors, Signal Processing, Thematic Mappers (Landsat)
Scientific paper
Various phases of ground testing of orbiting, object-scanning mapper telescopes require a high degree of alignment accuracy between the telescope under test and a bench collimator which simulates an earth scene. Alignments must be measured under transient conditions, during an interval in which the scanned ground image passes across the telescope's focal plane array (FPA). Alignment accuracies at microradian levels have been obtained over several rotational degrees of freedom by printing out patterns of detector signal versus time obtained from selected detectors as the scene image passes across the FPA. Although this technique was developed specifically for testing the Thematic Mapper (TM), it may be found useful in aligning and testing other kinds of scanning telescopes.
Thurlow Paul E.
Young James B.
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