Electromagnetic Compatibility Characterization of a BAe Stirling-Cycle Cryocooler for Space Application
The intended use of Stirling-cycle cryocoolers to cool infrared and submilli-meter imaging instruments on 5- to 10-year missions brings with it major challenges to cryocooler development. In particular, the voice-coil driven cryocoolers need to be electromagnetically compatible with the host instrument’s detectors as well as with neighboring instruments; specifically the cryocoolers must not generate levels of interference that degrade performance or cause malfunction of the cooled imaging detectors, payload instruments, or host spacecraft.
To support the design and successful operation of NASA space instruments, the Jet Propulsion Laboratory (JPL) has an ongoing extensive cryocooler characterization, test and analysis program to identify cryocoolers capable of meeting the stringent requirements. The characterization activity focuses on sensitive performance measuring techniques for quantification of thermal performance, vibration, electromagnetic compatibility (EMC), and life-limiting reliability degradation mechanisms. This paper describes the EMC measurements of a British Aerospace (BAe) 80-K Stirling-cycle cooler. The measurements, performed in the JPL EMC test facility, include DC magnetic field characterization, radiated magnetic and electric field emissions, and conducted emissions on the internal lines between the cooler electronics and the cooler. The measurements conform to both the MIL-STD-461C specifications as well as to the specifications for the NASA Earth Observing System (Eos).
KeywordsElectromagnetic Compatibility Cryogenic Engineer Magnetic Field Level Payload Instrument Bulkhead Plate
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