Other
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1237..604h&link_type=abstract
IN: Amplitude and intensity spatial interferometry; Proceedings of the Meeting, Tucson, AZ, Feb. 14-16, 1990 (A91-30676 12-89).
Other
Imaging Techniques, Laser Interferometry, Spaceborne Telescopes, Earth Orbital Environments, Electromagnetic Noise, Power Spectra
Scientific paper
A laser interferometer has been used to measure the relative optical pathlength variations from the focal plane to the six individual secondary telescopes of the Multiple Mirror Telescope (MMT). These pathlengths vary as functions of elevation due to variable gravitational loading, drive acceleration and velocity, temperature variations, and wind loading. Vibrations induced by wind loading and telescope drives, including building vibrations transmitted to the mount, cause high-frequency variations in the otherwise slowly varying optical pathlengths. This experiment was designed to evaluate the effects of these high-frequency perturbations on optical interferometry at various tracking rates, including those relevant to earth satellite observation. Effects are found which can strongly affect the contrast of interferograms.
Cheselka Matt
Hege Keith
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