Multi-stage pulse tube cryocooler with acoustic impedance...

Details Multi-stage pulse tube cryocooler with acoustic impedance... Multi-stage pulse tube cryocooler with acoustic impedance...

2005-08-23

2008-10-21

Doerrler, William C (Department: 3744)

Refrigeration

Gas compression, heat regeneration and expansion, e.g.,...

Reexamination Certificate

active

07437878

ABSTRACT:
The cool down time for a multi-stage, pulse tube cryocooler is reduced by configuring at least a portion of the acoustic impedance of a selected stage, higher than the first stage, so that it surrounds the cold head of the selected stage. The surrounding acoustic impedance of the selected stage is mounted in thermally conductive connection to the warm region of the selected stage for cooling the acoustic impedance and is fabricated of a high thermal diffusivity, low thermal radiation emissivity material, preferably aluminum.

REFERENCES:
patent: 5487272 (1996-01-01), Nagao
patent: 6330800 (2001-12-01), Price et al.
patent: 2002/0112484 (2002-08-01), Kim et al.
patent: 2004/0000149 (2004-01-01), Kirkconnell et al.
patent: 2004/0112065 (2004-06-01), Pan et al.
patent: 2004/0187519 (2004-09-01), Zhu et al.

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