Development of a Two-Stage Alternate Joule-Thomson Cryo-Cooler for AAWS-M Risk Reduction
Final technical rept. Jan 90-Apr 91,
ARMY MISSILE COMMAND REDSTONE ARSENAL AL ADVANCED SENSORS DIRECTORATE
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The latest in infrared imaging Focal Plane Array FPA technology incorporates Mercury Cadmium Telluride, a material that must be cooled to liquid nitrogen temperatures for operation. Fast cool-down, within five seconds, has been achieved under a harsh temperature environment 71 deg C. A Joule-Thomson Cryo-cooler employing two heat exchanger stages has been developed. High pressure Krypton flows through one stage, providing initial pre-cooling, while high pressure Nitrogen simultaneously flows through the other stage. The two- stage gas flow approach along with the superior pre-cooling properties of Krypton enable cool-down under five seconds.
- Guided Missiles