Diffraction-limited 10 microns imaging with 3 meter telescopes

Details Diffraction-limited 10 microns imaging with 3 meter telescopes Diffraction-limited 10 microns imaging with 3 meter telescopes

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986spie..627..473b&link_type=abstract

IN: Instrumentation in astronomy VI; Proceedings of the Meeting, Tucson, AZ, Mar. 4-8, 1986. Part 2 (A87-36376 15-35). Bellingha

Astronomy and Astrophysics

Astronomy

8

Infrared Astronomy, Infrared Imagery, Mercury Cadmium Tellurides, Photodiodes, Reflecting Telescopes, Spatial Resolution, Airy Function, Cryogenic Equipment, Diffraction, Liquid Helium, Mirrors, Pixels

Scientific paper

The authors have constructed an infrared imaging system that achieves diffraction-limited spatial resolution (about 0.8 arc seconds) at 10 μm on 3 meter ground-based telescopes. The system uses a linear array of sensitive HgCdTe photodiodes, scanned in the direction perpendicular to the array axis, to form two-dimensional images. Scans are completed rapidly enough to freeze atmospheric fluctuations. Individual detectors are small compared to the diameter of the Airy disk, and images are oversampled heavily in the scan direction. This method has a number of advantages for studying small fields with very high spatial resolution, and has been applied successfully to the problem of directly imaging faint circumstellar dust shells.

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