Optical Interferometry A Measure of Information in the Fringe Power and Bispectrum

Details Optical Interferometry A Measure of Information in the Fringe Power and Bispectrum Optical Interferometry A Measure of Information in the Fringe Power and Bispectrum

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.6306h&link_type=abstract

American Astronomical Society, 198th AAS Meeting, #63.06; Bulletin of the American Astronomical Society, Vol. 33, p.881

Astronomy and Astrophysics

Astronomy

Scientific paper

To image an object at optical wavelengths with a ground-based interferometer, we need measurements and calibration of both the fringe power and the bispectrum. The phase of the bispectrum, the closure phase, being the sum of phases along any three baselines of the interferometer that form a closed triangle is insensitive to atmospheric turbulence for vanishingly small apertures. For weak atmospheric turbulence (Fried parameter r0 comparable to or larger than the diameter D of an aperture) one expects only small variations in the measured bispectrum during an observation. For strong turbulence, r0<

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