Thermionic Emission Characteristics on Current-Controlled Preheating of Fluorescent Lamp Cathodes(Special Issue "The 7th International Symposium on the Science & Technology of Light Sources")

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This paper proposes a method for measuring the emission time under an optimum condition of current-controlled preheating of fluorescent lamp cathodes. Using this method, a themionic emission curve equation for practical lamp cathodes has been newly arrived at and the relationship between supplied energy for cathodes and its emission curve has been clarified. In addition, it has become clear that the supplied energy, till the emission time is reached, has a minimum value which varies with time and the average cathode resistance changes with a short emission time. These indicate the necessity of some improvements on the present IEC standard for the preheating condition of fluorescent lamp cathodes.
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