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前言目前,在锑化铟红外探测器中存在的一个较实出的问题是真空度下降,严重影响探测器的可靠性。在77K温度下工作的锑化铟光敏件,被封装在由宝石片作为信号透过窗口的杜瓦瓶真空夹层的基座上,灌入LN_2(液氮)后基座冷却,以保证工作温度。过去由于杜瓦瓶真空夹层的真空度下降破坏了真空绝热状态,造成窗口出现冰霜现象,致使光敏件无法接收信号而探测器报废。杜瓦瓶结构见图(1)(2)。
Preface At present, one of the more real problems in the Indium antimonide infrared detector is the decrease of the vacuum, which seriously affects the reliability of the detector. Indium antimonide photosensors working at a temperature of 77K are encapsulated on the base of a vacuum interlayer of Dewar flask, through which the gem slice acts as a signal transmission window. After pouring LN2 (Liquid Nitrogen), the base is cooled to ensure the operating temperature . In the past, due to the vacuum drop in the Dewar vacuum interlayer, the state of vacuum insulation was destroyed, causing frost in the window, which prevented the photosensitive member from receiving the signal and the detector was scrapped. Dewar bottle structure shown in Figure (1) (2).