US Government As Represented by the Secretary of the Army

Howard L Dunmire

Stuart B Horn

E Vincent Patrick

Howard K Dickson

Lundy H McMillion

William C Gerkin

Geoffrey S Sawyer

Richard A Wright

Mark S Asher

The disclosure is a dual controlled linear resonance cryogenic cooler and comprised of a remote cold finger and a compressor, both driven by linear motors. A motor control means is used with the linear motors to drive both motors with a phase delay of the cold finger motor from that of the compressor motor such that the compressor linear motor alternately drives a piston to produce alternating pressure waves in a light cooling gas in working relation with a regenerator-displacer in the remote cold finger and the cold finger linear motor has a delayed phase relationship with the compressor linear motor. The use of linear motors which are slightly out of phase with each other selectively provides flat top and bottom dead center with constant linear increases and decreases therebetween for the compressor piston to follow and to eliminate the normal side forces of the piston that cause excessive wear.

Linear resonance cryogenic cooler

The invention relates to a thermal coupling assembly between the cold fin of a cryogenic cooler and a dewar enclosed detector for use at infrared and far infrared frequencies. The coupling provides excellent thermal coupling without solid or even liquid contact between the cold finger and the detector, so that no strain or vibration is transmitted therebetween.

Noncontact thermal interface

A two chamber vacuum method and apparatus is provided for simultaneously independently preparing image tube components, or the like, with two distinct vacuum environments for separate preparation of the components, and for final assembling of these components in an interconnecting compartment by vacuum sealing.

Method and apparatus to fabricate image intensifier tubes

A Stirling Cooler with a three stage cold finger. The finger includes a sped displacer in a stepped cylinder. The cylinder is loosely surrounded by an outer shell, with regenerator material in the space between the outer shell and the cylinder. The displacer-cylinder define three swept expansion spaces each communicating with the regenerator space. Clearance seals exist between the displacer and the cylinder because of small diametrical clearance and long axial length with respect to the diametrical clearance.

Cryogenic cooler with annular regenerator and clearance seals

The invention provides a two part vacuum interlock for a vacuum chamber wh utilizes the chamber itself as an interconnecting member.

Vacuum interlock

The invention provides an elastic interface between a cooler dewar and an electronic cold finger which utilizes multitudinous conduction paths consisting of specialized bent fibers.

Growing community of inventors

Stafford, VA, United States of America

Howard L Dunmire