热阴极发射特性的微机化测量和分析
MICROCOMPUTERIZED MEASUREMENT AND ANALYSIS OF ELECTRON EMISSION PROPERTIES OF THERMIONIC CATHODES
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摘要: 本文介绍了一套微机化热阴极发射特性测量系统。用它能快速自动地获取伏安特性数据,精度为0.05％(满标量程),一条曲线所需时间少于5s,用它还能获取Schottky外延零场发射、拐点发射、转折点发射、平均有效逸出功、Richardson逸出功、工作温度下阴极表面的逸出功分布等反映阴极特性的重要信息。 对四种阴极的研究结果表明,本系统特别适合于用来研究阴极激活、老炼、中毒和寿命过程中活性的变化。通过对一种栅控行波管的测量,证明本系统可用来监测整管中阴极的活性。Abstract: A microcomputerized measuring system is developed. This system automatically acquires an I-V characteristic curve in 5 seconds with an accuracy of 0.05% (ful scale-range). The Schottky extrapolation field-free emission, the inflection point emission, the flection point emission, the average effective work, function, the Richardson .work function, the work function distribution at the operation temperature and other important informations that reflect properties of cathode are obtained by this system. The results after analysing four type of cathodes demonstrate that this system is very suitable for measuring the property changes of the cathode in the processes of activation, ageing, poisoning and life test. It is proved that this system can also be used to monitor the property of the eathode in the assembled tube by measuring a grid controlled travelling-wave tube.
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