熱陰極脈沖拐點(diǎn)發(fā)射的快速測(cè)量
RAPID-MEASUREMENT OF PULSE EMISSION CURRENT AT THE INFLECTION POINT ON I-U CURVE OF THE THERMIONIC CATHODE
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摘要: 本文介紹了一種借助線路技術(shù)快速測(cè)定熱陰極的脈沖拐點(diǎn)發(fā)射的方法。這一方法可避免測(cè)試對(duì)陰極的損傷,可提高測(cè)量的準(zhǔn)確性,可用于比較不同熱陰極的發(fā)射水平和監(jiān)測(cè)壽命試驗(yàn)過(guò)程中陰極活性的變化。本文還敘述了熱陰極脈沖拐點(diǎn)發(fā)射快速測(cè)量的原理,實(shí)現(xiàn)了拐點(diǎn)在伏安特性曲線上的自動(dòng)顯示,給出了鑒定拐點(diǎn)真實(shí)性的方法,并討論了儀器的測(cè)量誤差,通過(guò)對(duì)各種實(shí)用熱陰極的大量測(cè)試表明,該儀器是有實(shí)用意義的。
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關(guān)鍵詞:
Abstract: 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. -
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