Abstract The expanding use of cooled detectors in orbital science and defence applications has produced a natural evolution towards higher performance in the detector cooling system. The control of forces emitted by the cooling system becomes ever more significant with the demands for greater instrument pointing accuracy and, for detectors operating at sub-Kelvin temperatures, control of parasitic heat loads due to vibration of the detector cryostat. This trend in requirements towards lower vibration is clearly evident in the recent supply of flight cooler systems by Astrium to INTEGRAL, HELIOS II and ENVISAT (AATSR and MIPAS). In the instruments for these programs the Astrium coolers are operated in a back-to-back configuration for minimum exported force. The subject of this paper is the reduction of exported forces to a minimum by the active control of the cooler drive power. This paper will discuss some active steps which can be taken to reduce the forces exported from a cooler system using active control in analogue/digital electronics. It will outline a role in which embedded Digital Signal Processors (DSPs) can further improve performance.
Active Vibration Cancellation in Astrium Stirling Cycle and Pulse Tube Coolers
Cryocoolers 12 ; 771-775
2003-01-01
5 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Active Vibration Cancellation in Astrium Stirling Cycle and Pulse Tube Coolers
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