1 December 1975 Design of Highly Stable Optical Support Structure
Author Affiliations +
As spaceborne optical systems increase in diameter to achieve improved resolution, the stability requirements imposed on structures approach values which were unthinkable only several years ago. To achieve the capabilities of these apertures optical path errors must not exceed a specific fraction of the wavelength of light, and this fraction, typically x/20 rms in the focal plane, is independent of system size. Thus, from a percentage error basis, large optical support structures represent a far more formidable development task than do smaller systems. The Large Space Telescope (LST) sponsored by MSFC/NASA is a case in point. The Optical Telescope Assembly (OTA) is shown (Fig. 1) installed in the LST spacecraft. The vertex-to-vertex spacing of the primary and secondary mirror is 193 inches. To achieve satisfactory optical performance, this spacing must be maintained constant to a precision of -±11.1 for observation periods up to 10 hours. During this time it may be necessary to alter the spacecraft attitude with respect to the sun, which would change the temperature levels and gradients within the structures. It is believed that by exploiting the use of graphite-epoxy in a novel manner, the stringent alignment require-ments can be satisfied with a nominally passive structure.
Michael H. Krim, "Design of Highly Stable Optical Support Structure," Optical Engineering 14(6), 146552 (1 December 1975). https://doi.org/10.1117/12.7971792 . Submission:


Optimizing cryogen utilization on Spitzer Space Telescope
Proceedings of SPIE (October 12 2004)
Design of a spaceborne astrometric survey instrument
Proceedings of SPIE (August 28 1998)
The Solar Optical Telescope onboard the Solar-B
Proceedings of SPIE (October 12 2004)
10-m optical telescope for deep-space communications
Proceedings of SPIE (July 01 1990)
SIRTF On-Orbit Thermal Bending Analysis
Proceedings of SPIE (April 27 1988)

Back to Top