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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。
This article describes a set of computerized hot cathode emission characteristics of the measurement system. Use it to quickly and automatically obtain the volt-ampere characteristic data with the accuracy of 0.05% (full scale range). The time required for a curve is less than 5s. It can also obtain Schottky epitaxial zero-field emission, inflection point launch, inflection point launch and average effective The work function, the work function of Richardson, the work function of the cathode surface, such as the work of the distribution of negative reflection of cathode properties of important information. The results of the four cathodes show that the system is particularly suitable for studying changes in activity during cathodic activation, aging, poisoning and life span. The measurement of a gated TWT shows that the system can be used to monitor the cathode activity in the whole pipe.