热阴极脉冲拐点发射的快速测量

本文介绍了一种借助线路技术快速测定热阴极的脉冲拐点发射的方法。这一方法可避免测试对阴极的损伤,可提高测量的准确性,可用于比较不同热阴极的发射水平和监测寿命试验过程中阴极活性的变化。本文还叙述了热阴极脉冲拐点发射快速测量的原理,实现了拐点在伏安特性曲线上的自动显示,给出了鉴定拐点真实性的方法,并讨论了仪器的测量误差,通过对各种实用热阴极的大量测试表明,该仪器是有实用意义的。

RAPID-MEASUREMENT OF PULSE EMISSION CURRENT AT THE INFLECTION POINT ON I-U CURVE OF THE THERMIONIC CATHODE

Pulse emission current at the inflection point on I-U curve of a thermionie eathode can be measured rapidly by means of a circuital technique. This method can prevent the eathode from suffering injury during the measurement. So that it can be used to compare the emission levels between different thermionie cathodes, and to monitor the changes of activation of cathodes during life test. The principle of the rapid-measurement of pulse emission current at the inflection point on I-U curve of the thermionic caathode is discribed. Autodisplay of the inflection point on the I-U characteristics is realized. The method of verification of its correctness is given. A great deal of measurements on various thermionic cathodes show that the instrument is of practical value. Finally the measuring error of the instrument is discussed.