Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986spie..627..797m&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
3
Image Resolution, Infrared Astronomy, Infrared Interferometers, Speckle Interferometry, Stellar Luminosity, Diffraction, Power Spectra, Signal To Noise Ratios, Visibility
Scientific paper
Current techniques for IR speckle interferometry treat all exposures with equal weight regardless of instantaneous atmospheric 'seeing'. In an effort to improve accuracy in measurements of visibility amplitude and phase, measurements of image quality are used to bin individual exposures. Several criteria, including the second-order moment of the image, and two sharpness functions considered previously in adaptive optics applications, are investigated. Test results on bright stars indicate that the sharpness parameters are more sensitive to image quality. These tests also delineate the correlation between sharpness and the second-order moment and demonstrate the variations, sometimes periodic, in image quality caused by atmospheric seeing. Initial tests of a binning technique using real astronomical data exhibit improved accuracy and reduced sensitivity to atmospheric fluctuations.
Cobb Melinda Lewis
McCarthy Donald W. Jr.
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