微型金属复合杜瓦瓶漏热测试系统的设计

Design of Heat Leakage Detection System for Mini Metal Dewar

杜瓦瓶是红外探测器的核心组件,其质量会直接影响整个热成像系统的可靠性。为了能更好地检测杜瓦瓶的真空特性,本文设计了一套用来测试杜瓦瓶液氮保持时间的设备,通过测试器件开路电压、液氮挥发等参数确定杜瓦器件真空的性能变化。本文对杜瓦瓶漏热进行了理论计算,并且进行了大量实验。根据实验数据与理论计算的比较可以看到,该设备具有较好的测量精度,达到了预期的设计目标。

Dewar is the key component of an infrared detector and its quality has the direct influence on the reliability of the whole thermal imaging system. In order to detect the vacuum characteristics of a Dewar better, a set of equipment for checking a Dewar for its holding time of LN2 is designed in this paper. In this set of equipment, the performance variation of a Dewar when a device is in vacuum can be determined by testing the parameters such as the open-circuit voltage of the device and the volatilization of LN2 . In this paper, the heat leakage of a Dewar is calculated in theory and a lot of experiments are carried out. By comparison of the experimental data with the theoretical calculation, it can be found that this set of equipment has a better measuremnet precision and its expected design aim is achieved.