Alignment Of Earth-Scanning Mapper Telescopes And Test Collimators Using Computerized Signal Histogram Printouts

P. E. Thurlow; J. B. Young

doi:10.1117/12.943126

13 August 1984 Alignment Of Earth-Scanning Mapper Telescopes And Test Collimators Using Computerized Signal Histogram Printouts

P. E. Thurlow, J. B. Young

Author Affiliations +

Proceedings Volume 0483, Optical Alignment II; (1984) https://doi.org/10.1117/12.943126
Event: 1984 Technical Symposium East, 1984, Arlington, United States

Abstract

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.

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P. E. Thurlow and J. B. Young "Alignment Of Earth-Scanning Mapper Telescopes And Test Collimators Using Computerized Signal Histogram Printouts", Proc. SPIE 0483, Optical Alignment II, (13 August 1984); https://doi.org/10.1117/12.943126

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