熱陰極發(fā)射特性的微機化測量和分析
MICROCOMPUTERIZED MEASUREMENT AND ANALYSIS OF ELECTRON EMISSION PROPERTIES OF THERMIONIC CATHODES
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摘要: 本文介紹了一套微機化熱陰極發(fā)射特性測量系統(tǒng)。用它能快速自動地獲取伏安特性數(shù)據(jù),精度為0.05％(滿標量程),一條曲線所需時間少于5s,用它還能獲取Schottky外延零場發(fā)射、拐點發(fā)射、轉(zhuǎn)折點發(fā)射、平均有效逸出功、Richardson逸出功、工作溫度下陰極表面的逸出功分布等反映陰極特性的重要信息。 對四種陰極的研究結果表明,本系統(tǒng)特別適合于用來研究陰極激活、老煉、中毒和壽命過程中活性的變化。通過對一種柵控行波管的測量,證明本系統(tǒng)可用來監(jiān)測整管中陰極的活性。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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