A Large Area Array Infrared Focal Plane Dewar Cold Finger Support Structure with High Thermal Resistance and High Stiffness

Abstract

The invention discloses a large area array infrared focal plane Dewar cold finger support structure with high thermal resistance and high rigidity, including: cold finger, Dewar, pulse tube, hot end, glass fiber bundle and roller device; wherein, the cold The finger and the hot end are respectively welded to both ends of the pulse tube; the temperature of the hot end is between -30°C and -20°C, and the temperature of the cold finger is below 80K; the Dewar is welded on the hot On the end, the Dewar is sleeved on the outer surface of the pulse tube; the roller device is arranged on the Dewar, and the glass fiber bundle connects the cold finger and the Dewar through the roller device. connect. The invention utilizes the advantages of glass fiber bundles to realize the high rigidity support of the cold fingers, and at the same time realizes the decoupling of the stiffness of the cold fingers along the axial direction of the pulse tube, solves the structural deformation problem caused by the over-constraint of the cold fingers, improves the structural thermal resistance, and greatly reduces the cold fingers heat leakage rate.

Description

technical field [0001] The invention belongs to the technical field of large area array infrared focal plane refrigeration for space cameras, and in particular relates to a large area array infrared focal plane Dewar cold finger support structure with high thermal resistance and high rigidity. Background technique [0002] In order to obtain good imaging quality for space infrared cameras, the infrared array detector needs to work in a deep low temperature environment (below 80K), so the detector needs to be cooled and dewar-packaged to form a Dewar component. At present, due to its technical advantages such as long life, simple structure, small mechanical vibration, and high cooling efficiency, pulse tube refrigerators have replaced radiation refrigerants and become the first choice for cooling space infrared camera area array detectors. Pulse tube refrigerator, which is composed of compressor, expander, hot end, pulse tube, regenerator, cold finger and other structures, wh...

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide a large area array infrared focal plane Dewar cold finger support structure with high thermal resistance and high rigidity, and to realize the high rigidity support of the cold finger by utilizing the advantages of glass fiber bundles, At the same time, the decoupling of the stiffness of the cold finger along the axial direction of the pulse tube is realized, the structural deformation problem caused by the over-constraint of the cold finger is solved, the thermal resistance of the structure is improved, and the heat leakage rate of the cold finger is greatly reduced.

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