This paper discusses the present status of development of rotary reciprocating refrigerators, which are closed cycle, cryogenic refrigerators specifically designed for cooling space-borne sensors on extended missions. Three machines will be described: a two temperature level Brayton cycle refrigerator which has been built and tested, a three temperature level Brayton cycle refrigerator which is in the early stages of development, and a two temperature level Stirling cycle refrigerator which is in the conceptual design stage.
R. W. Breckenridge,
"Refrigerators For Cooling Spaceborne Sensors", Proc. SPIE 0245, Cryogenically Cooled Sensor Technology, (3 November 1980); doi: 10.1117/12.959341; https://doi.org/10.1117/12.959341