Structural Analysis of an Infrared Focal Plane Dewar Assembly for Meteorological Satellite

摘要

This paper designs a vacuum packaged Dewar for meteorological satellites. It integrates an 80 × 1 long wavelength photodetector with a wavelength of 13.2 μm to 13.8 μm and a dual band focal plane detector with a wavelength of 10.3um-11.3um / 11.5um-12.5um. The detector uses a mechanical cooler to reach an operating temperature of 60K. The theoretical calculation and simulation analysis are carried out from two aspects: cold load and mechanical vibration of Dewar. The analysis shows that when the ambient temperature is room temperature and the detector operating temperature is 60K, the total heat loads of the cold plate is 1.25W. Where the wires loss accounts for about 36% of the total heat load and the detector Joule heat accounts for about 21%. The mechanical vibration analysis of Dewar shows that the cold plate pillar is the main factor affecting the mechanical properties of the structure. Increasing the pillar support increases the base frequency of the Dewar from 379 Hz to 539 Hz, thereby increasing the mechanical base frequency of the Dewar components.