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Title:
Nutating subreflector for a millimeter wave telescope
Authors:
Radford, Simon J. E.; Boynton, Paul; Melchiorri, Francesco
Affiliation:
AA(Battelle Observatory, Richland; Washington, University, Seattle), AB(Washington, University, Seattle), AC(Roma I, Universita, Rome, Italy)
Publication:
Review of Scientific Instruments (ISSN 0034-6748), vol. 61, March 1990, p. 953-959. Research supported by NSF and CNR. (RScI Homepage)
Publication Date:
03/1990
Category:
Optics
Origin:
STI
NASA/STI Keywords:
CASSEGRAIN OPTICS, MILLIMETER WAVES, NUTATION, SUBREFLECTORS, TELESCOPES, CONTROL SYSTEMS DESIGN, GRAPHITE-EPOXY COMPOSITES, LAMINATES, LIGHT BEAMS, MIRRORS, OPTICAL SWITCHING
DOI:
10.1063/1.1141448
Bibliographic Code:
1990RScI...61..953R

Abstract

Nutating a Cassegrain telescope's secondary mirror is a convenient method of steering the telescope beam through a small angle. This principle has been used to construct a high-performance beam switch for a millimeter wave telescope. A low mass, graphite-epoxy laminate secondary mirror is driven by linear electric motors operated in a frequency compensated control loop. By design, the nutator exerts little net oscillating torque on the telescope structure, resulting in virtually vibration free operation. The inherent versatility of beam switching by subreflector nutation permits a variety of switching waveforms to be tested without making any hardware changes. The nutator can shift the telescope beam by 10 arcminutes, a 1.25 deg rotation of the 75-cm-diam secondary mirror, in an interval of 8 ms and it can sustain a switching frequency of 10 Hz.
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