A self imaging technique for focussing an IR telescope

Details A self imaging technique for focussing an IR telescope A self imaging technique for focussing an IR telescope

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1309..245j&link_type=abstract

IN: Infrared imaging systems: Design, analysis, modeling, and testing; Proceedings of the Meeting, Orlando, FL, Apr. 16-18, 1990

Physics

1

Focal Plane Devices, Focusing, Infrared Imagery, Infrared Telescopes, Black Body Radiation, Mirrors, Schmidt Cameras, Spectral Bands

Scientific paper

A method has been developed, whereby the optimum focus of an IR telescope may be determined utilizing self imaging. A set of gold-bars, located adjacent to an array of detectors within a cooled focal plane, are reimaged and scanned across the detector array. The respective spatial and temporal frequencies of the gold bars and external scan mirror are selected to maximize the response of the sensor electronics. The resulting response to this cooled periodic stimulus is Fourier transformed and stored in memory for each location of the focal plane. The optimum focus is determined to be the position where maximum power at the stimulating frequency was obtained.

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