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New entrance shade design for SIRTFA new design for the entrance shade for the Space Infrared Telescope Facility (SIRTF) is presented. The evolution of the entrance shade began with a simple frustum, symmetrical about the telescope axis, when SIRTF was expected to be Shuttle-attached. With the change to a free-flying SIRTF this frustum was cut off at an angle. The telescope will be operated so that whenever not in the earth's shadow the high side is kept toward the sun. However, the entrance shade interior itself will be so warm that the optics, including the secondary mirror and its mechanisms and support structure, will be restricted to the rear part of the barrel, termed the aftbaffle, which is shaded from the interior of the entrance shade by the forebaffle. This is best accomplished by the most recent design in which the axis of the entrance shade is offset from the telescope axis. This results in a shorter entrance shade, shorter forebaffle, and a shaded region within the barrel which is symmetrical about the telescope axis. All of these are advantageous.
Document ID
19900024198
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Davis, Paul K.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1989
Subject Category
Optics
Meeting Information
Meeting: Cryogenic Optical Systems and Instruments III
Location: San Diego, CA
Country: United States
Start Date: August 17, 1988
End Date: August 19, 1988
Sponsors: SPIE
Accession Number
90A11253
Distribution Limits
Public
Copyright
Other

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