Low temperature dewar cool platform support device for focal plane detector

Abstract

The invention discloses a supporting mechanism for a cooling platform of a cryostat of a focal plane detector. The supporting mechanism consists of a spindly thin wall cylindrical supporting column and four inclined pull type tinsels provided with prills on the two ends. The supporting column is arranged inside a boom-type casing of the cryostat, a cooling platform is supported by the supporting column fixed through weld, the four angles of the cooling platform are separately connected with tinsel, the connection between the tinsel and the cooling platform is spherical pair connection, and the other end of the tinsel is connected with an active and fixing column screwed on the side wall of a feed through collar in downward and inclined pull type and with spherical pair. The screwing screw is the screw for screwing the active and fixing column and the feed through collar, and is also the screw to load the pretightening force for the inclined type tinsel, and a screw cap for fixing the pretightening force is sleeved outside the screw. The invention has the advantages that the supporting mechanism overrides the abuse of the traditional cooling platform supporting structure on dynamics, and ensures that the detector is within the allowed error range of the optical system focal plane. The inclined pull type tinsel is connected with the active and fixing column and the cooling platform by adopting the spherical pair connection, when continuous outer impulsion and disturbance are received, the connecting part can be moved freely, and no fatigue bruising is created to cause breakage.

Description

technical field [0001] The invention relates to a low-temperature metal dewar, in particular to a supporting mechanism of a cold platform for installing an infrared focal plane detector packaged in the low-temperature metal dewar. Background technique [0002] Ultra-long line array or ultra-large area array infrared focal plane detectors have the following characteristics: 1) Multi-chip module assembly; 2) In order to ensure the reliability and yield of the detector, the chip generally has a large-area passive substrate that is resistant to temperature shocks ; 3) Multiple optical components (such as optical filters) and their supports; 4) In order to reduce background noise and improve detector performance, a cold screen is used; 5) There are more functional lead-out substrates. These components are installed on the cold platform and packaged in the Dewar, which requires the supporting mechanism of the cold platform to have better mechanical strength, less heat leakage and ...

AI Technical Summary

Problems solved by technology

Regardless of the above structure, there is a big disadvantage, that is, when the supporting column is subjected to a large force or impact in the X and Y directions, the disturbance and inclination angle of the cold platform are relatively large, and it is difficult to ensure that the detector is always Located within the allowable error range of the focal plane of the optical system

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