Physics – Optics
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980itap...28..652v&link_type=abstract
IEEE Transactions on Antennas and Propagation, vol. AP-28, Sept. 1980, p. 652-657.
Physics
Optics
1
Cassegrain Optics, Gravitational Effects, Radio Telescopes, Reflecting Telescopes, Sidelobes, Aberration, Beams (Radiation), Defocusing, Parabolic Bodies, Structural Analysis, Wave Degradation
Scientific paper
Beam mapping at 1.3 cm wavelength is found to exhibit a considerable degradation at the 140 ft telescope which results from a large lateral defocusing, varying by 7.2 cm east-west and 2.8 cm north-south for pointing changes of 90 degrees. A structural analysis confirms that a gliding rotation of the best-fit paraboloid causes movement in the optical axis. The best-fit paraboloid glides along a slightly deformed surface while rotating about the center of the average surface curvature. A method to alleviate the degradation for this and other types of telescopes employs a variable lateral shift of the mount at the prime focus which is computer-controlled as a function of the pointing and follows the axial movements.
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