Physics – Optics
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977opten..16..569m&link_type=abstract
Optical Engineering, vol. 16, Nov.-Dec. 1977, p. 569-574. NSF-supported research.
Physics
Optics
4
Design Analysis, Infrared Astronomy, Infrared Interferometers, Angular Resolution, Cassegrain Optics, Data Processing, Diffraction Patterns, Michelson Interferometers, Planetary Evolution, Point Sources, Telescopes
Scientific paper
An infrared spatial interferometer, designed to extend the angular resolution of routine telescopic observations at 2-20 micron wavelengths, is described. It is found that at 10 microns, using a baseline of 3 meters, an angular resolution of 0.1 arcsec has been achieved. Observations are made in the presence of less than or equal to 4 arcsec conditions of so-called atmospheric seeing. The device operates at the Cassegrain focus of conventional telescopes which measures fringe visibilities at different separations and position angles of two circular beams projected onto opposite sides of the telescope's primary mirror. Atmospheric seeing modulates the amplitude and phase of the fringe signal at rates varying from 4 to 40 Hz. The device has been used to measure the angular diameters and shapes of 8 infrared sources.
Howell Robert R.
Low Frank J.
McCarthy Donald W.
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