Test Dewar flask capable of achieving vacuum detection

Abstract

The invention discloses a test Dewar flask capable of achieving vacuum detection. The test Dewar flask is a vacuum sealing container composed of an inner Dewar cylinder, an outer Dewar cylinder and a Dewar window cap, wherein the inner Dewar cylinder, the outer Dewar cylinder and the Dewar window cap are made of metal materials. A vacuum detection valve is welded to the Dewar window cap and coupled with a vacuum gauge, so that vacuum detection of the Dewar flask is achieved. The test Dewar flask of the structure has the advantages that the structure that the window cap for testing the Dewar flask and the Dewar flask are split is fully used, a conventional window cap is detached and replaced by the window cap with the vacuum detection function, and therefore tests of vacuum and vacuum retention time of the test Dewar flask are achieved. According to the test Dewar flask of the structure, on the basis that the structure of a conventional test Dewar flask is not changed, vacuum and vacuum retention time of the test Dewar flask can be tested, installation and detachment are simple and convenient, and the test Dewar flask is particularly suitable for vacuum detection and acceptance check.

Description

technical field [0001] The invention discloses an infrared detector test dewar, in particular a test dewar with vacuum detection. Background technique [0002] Infrared detector components are the core components of infrared detection systems and are widely used in aerospace and military fields. Most infrared detector components need to work at low temperature, so the detector needs to be packaged in a vacuum dewar to achieve low temperature operation, and the maintenance of vacuum degree is an important indicator of vacuum dewar. On the basis of not changing the structure of the vacuum dewar, it has always been a difficult point to directly detect the vacuum. At present, the heat load is often used to indirectly characterize the vacuum degree of the dewar, but the heat load includes heat convection, heat radiation and heat conduction. In this way, the degree of vacuum only affects heat convection. It is difficult to characterize the vacuum of the vacuum Dewar for Dewars of...

AI Technical Summary

Problems solved by technology

[0003] The technical problem solved by the present invention is: the vacuum degree difference of the test Dewar or the vacuum degree holding time is short will directly affect the infrared detector component test, so the vacuum degree detection is an important index of the test Dewar acceptance, due to the wide variety of test Dewars And it needs to be reused. At present, there is no method to detect the vacuum degree of Dewar conveniently and quickly without changing the original Dewar structure.

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