Surface figure measurements of radio telescopes with a shearing interferometer

Details Surface figure measurements of radio telescopes with a shearing interferometer Surface figure measurements of radio telescopes with a shearing interferometer

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apopt..30.1227s&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 30, April 1, 1991, p. 1227-1241.

Physics

Optics

18

Diffraction Patterns, Holographic Interferometry, Interferometers, Radio Telescopes, Submillimeter Waves, Bandwidth, Equipment Specifications, Mirrors, Signal To Noise Ratios, Telescopes

Scientific paper

A new technique for determining the surface figure of large submm telescopes is presented, which is based on measuring the telescope's focal plane diffraction pattern with a shearing interferometer. In addition to the instrumental theory, results obtained using such an interferometer on the 10.4-m-diam telescope of the Caltech Submillimeter Observatory are discussed. Using wavelengths near 1 mm, a measurement accuracy of 9 microns, has been achieved, and the rms surface accuracy has been determined to be just under 30 microns. The distortions of the primary reflector with changing elevation angle have also been measured and agree well with theoretical predictions of the dish deformation.

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