Thermal modeling of the Shuttle Infrared Telescope Facility

Details Thermal modeling of the Shuttle Infrared Telescope Facility Thermal modeling of the Shuttle Infrared Telescope Facility

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983spie..428..279g&link_type=abstract

IN: Infrared technology IX; Proceedings of the Ninth Annual Meeting, San Diego, CA, August 23-25, 1983 (A85-22673 09-35). Bellin

Physics

Optics

Cryogenic Cooling, Space Infrared Telescope Facility, Space Shuttles, Spaceborne Telescopes, Temperature Control, Thermal Simulation, Beryllium, Equipment Specifications, Helium, Mirrors, Nasa Programs, Optical Equipment, Silicon Dioxide, Space Commercialization

Scientific paper

The Shuttle Infrared Telescope Facility (SIRTF) is a cryogenically cooled telescope in the one-meter aperture class designed for sensing in the infrared from 2-200 microns. This facility is currently planned for multiple missions onboard the Space Shuttle with varying instrument complements. All components of the SIRTF within the field of view of the optics are cryogenically cooled. The baseline primary coolant is supercritical helium which is stored in an external tank and routed through the telescope-cooling the instruments, the optical components and the baffles. For detector cooling below 6 K, small reservoirs of superfluid helium (HeII) are provided. The SIRTF was thermally modeled on the SINDA computer program both for steady state and transient solutions. The analysis shows that the baseline configuration has a large capacity for growth in cryogen requirements. A proportional controller model was developed for transient operations. The control system maintained the optics within all prescribed temperature limits except for certain combinations of transients involving a large step change in the power dissipation in the secondary mirror assembly and/or when the primary mirror was assumed to be constructed of quartz. The baseline SIRTF will perform the mission for which it was designed.

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