Measurements of the atmospheric transfer function

Details Measurements of the atmospheric transfer function Measurements of the atmospheric transfer function

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976opa..agarq....d&link_type=abstract

In AGARD Opt. Propagation in the Atmosphere 14 p (SEE N76-29815 20-46)

Physics

Atmospheric Turbulence, Modulation Transfer Function, Optical Paths, Telescopes, Electromagnetic Wave Transmission, Interferometers, Optical Measurement, Turbulence Effects, Wave Front Deformation

Scientific paper

A wavefront folding interferometer has been constructed with which the long time averaged modulation transfer function, MTF, of the atmosphere can be measured. The instrument was used to determine the MTF over 10 nights in June 1974 at Mauna Kea Observatory, Hawaii, using bright stars as sources. The form of the MTF at separations of a few centimeters in the pupil agreed with that predicted on the basis of a Kolmogorov spectrum of turbulence, but there was a departure at larger separations. The MTFs were highly variable both from hour-to-hour and night-to-night; the wavefront correlation region varying from approximately 4 to 20 cm. Increasing the zenith angle generally decreased the correlation region, but no exact relationship was observed.

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