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System concept for a moderate cost Large Deployable Reflector (LDR)A study was carried out at JPL during the first quarter of 1985 to develop a system concept for NASA's LDR. Major features of the concept are a four-mirror, two-stage optical system; a lightweight structural composite segmented primary reflector; and a deployable truss backup structure with integral thermal shield. The two-stage optics uses active figure control at the quaternary reflector located at the primary reflector exit pupil, allowing the large primary to be passive. The lightweight composite reflector panels limit the short-wavelength operation to approximately 30 microns but reduce the total primary reflector weight by a factor of 3 to 4 over competing technologies. On-orbit thermal analysis indicates a primary reflector equilibrium temperature of less than 200 K with a maximum gradient of about 5 C across the 20-m aperture. Weight and volume estimates are consistent with a single Shuttle launch, and are based on Space Station assembly and checkout.
Document ID
19870031234
Document Type
Reprint (Version printed in journal)
Authors
Swanson, P. N. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Breckinridge, J. B. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Diner, A. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Freeland, R. E. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Irace, W. R. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Mcelroy, P. M. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Meinel, A. B. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Tolivar, A. F. (California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Date Acquired
August 13, 2013
Publication Date
September 1, 1986
Publication Information
Publication: Optical Engineering
Volume: 25
ISSN: 0091-3286
Subject Category
SPACECRAFT DESIGN, TESTING AND PERFORMANCE
Distribution Limits
Public
Copyright
Other