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Surface figure measurements of radio telescopes with a shearing interferometer

Serabyn, E. and Phillips, T. G. and Masson, C. R. (1991) Surface figure measurements of radio telescopes with a shearing interferometer. Applied Optics, 30 (10). pp. 1227-1241. ISSN 0003-6935. doi:10.1364/AO.30.001227.

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A new technique for determining the surface figure of large submillimeter wavelength 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 µm, or λ/115, has been achieved, and the rms surface accuracy has been determined to be just under 30 µm. 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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Additional Information:© 1991 Optical Society of America. Received 6 March 1990. The authors wish to express their gratitude to K. Young for single-handedly integrating the interferometer with the computer system at the CSO; W. Schaal, D. Vail, P. Schaffer, and B. Ellison for assistance in constructing the interferometer; J. B. Keene for assistance with the bolometer and filters; D. P. Woody for providing the OVRO holography software and the dish model calculations; J. H. Davis, D. Morris, J. H. Lacy, and again D. P. Woody for illuminating discussions; and A. Schinkel and the staff of the CSO for endless on-the-spot assistance. This work was supported by NSF grant AST88-15132.
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Subject Keywords:Shearing interferometry, radio telescopes, radio holography.
Issue or Number:10
Record Number:CaltechAUTHORS:20120424-102142467
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Official Citation:E. Serabyn, T. G. Phillips, and C. R. Masson, "Surface figure measurements of radio telescopes with a shearing interferometer," Appl. Opt. 30, 1227-1241 (1991)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:30274
Deposited By: Ruth Sustaita
Deposited On:24 Apr 2012 17:50
Last Modified:09 Nov 2021 19:44

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