Cryogenic cooler.

摘要

A thermal energy detecting system includes a closed cycle cooler (refrigerator) (14) having a piston assembly including a piston, (38) a piston (28) housing and a preloaded spring (78) mounted in the piston housing between the head of the piston and the piston housing for substantially reducing any clearances of the piston assembly during the pressure changes occurring above and below the piton during the cooling cycle of the cooler.