A Cassegrain type null-corrector for surface tests of parabolic microwave reflectors

Details A Cassegrain type null-corrector for surface tests of parabolic microwave reflectors A Cassegrain type null-corrector for surface tests of parabolic microwave reflectors

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ijimw...5..761g&link_type=abstract

International Journal of Infrared and Millimeter Waves (ISSN 0195-9271), vol. 5, June 1984, p. 761-766.

Physics

Optics

1

Cassegrain Optics, Laser Interferometry, Microwave Antennas, Millimeter Waves, Null Zones, Parabolic Reflectors, Aberration, Infrared Telescopes, Optical Correction Procedure

Scientific paper

The design of Cassegrain-type interferometric null-correctors for steep parabolic reflectors (as used for microwave and IR observations) is examined analytically. The optical principle is explained and illustrated, and the surface contour is derived. It is demonstrated that physically meaningful solutions exist, and the practicality of a device using metallic aspheric surfaces and 10.6-micron light from a CO2 laser is discussed. Surface roughness less than about 1.5 microns rms and accuracy about 1 mm are required.

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