A linear drive cryocooler for ultra-small infrared sensor systems

In response to continuing requirements for smaller, lighter, and lower power cryocoolers for tactical IR applications, DRS Technologies has developed its smallest linear drive cooler for the micro-Integrated Dewar Cooler Assembly (mu IDCA). The entire cooler/Dewar assembly occupies slightly more than 4 cubic inches in a rectangular form that measures about 1-inch by 2-inch by 2-inches. The design goals and constraints are presented and the resulting design is discussed. Operating parameters and testing results are summarized. In addition to the review of the mu IDCA cryocooler, this paper presents a brief update of long-term reliability and life testing for a variety of DRS' linear drive cryocoolers. This testing program was initiated in the 1990's and has demonstrated cooler lifetimes in excess of 50,000 hours.