Abstract
A regenerator matrix of a Stirling-cycle cryocooler ususally consists of stacked wire-gauze. Recently a plastic regenerator matrix is investigated. It is expected to decrease its weight and cost. A free-piston type Stirling-cycle cryocooler for an IR sensor, which can generate cooling capacity of 1W max at 80K level, is commercialized. We measured the performance characteristics of the cooler employing a plastic regenerator matrix. The regenerator matrix all replaced by plastic screens lowered COP to about 2/3 times that of stainless steel wire-gauze. In case the regenerator matrix is partly replaced by plastic screens, COP depended on the ratio. The proper stacking method resulted in COP almost equal to that of the wire-gauze.
