Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1340..280p&link_type=abstract
IN: Cryogenic optical systems and instruments IV; Proceedings of the Meeting, San Diego, CA, July 10-12, 1990 (A92-22851 08-31).
Astronomy and Astrophysics
Astronomy
Background Radiation, Cryogenic Fluid Storage, Infrared Signatures, Supercritical Fluids, German Space Program, Shuttle Pallet Satellites, Sky Surveys (Astronomy), Storage Tanks, Thermal Analysis
Scientific paper
A superfluid helium dewar design for operation under supercritical conditions is described. The dewar consists of a 300 1 volume cylinder toroidal tank suspended from the vacuum shell by preloaded GFC chains. Three ventgas cooled radiation shields surround the tank. The optics is mounted to a flange at the He tank being conductively cooled. The optics temperature is allowed to float with the tank temperature going from 4.8 to 10 K while holding the tank pressure constant at 2.8 bar. The focal planes of the IR sensor are actively heated and held at a constant temperature of 10.5 and 14.2 K.
Lange Guenter
Lieb H.
Pulkert Guenther
Seidel Alexander
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