Some transient characteristics of electrically heated tungsten filaments

Gupta, KC and Satyam, M (1963) Some transient characteristics of electrically heated tungsten filaments. In: Journal of Scientific Instruments, 40 (5). pp. 244-246.

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Abstract

Temperature-time characteristics of tungsten filaments heated electrically under constant voltage in vacuum have been analysed. The analysis is carried out over the temperature range 300-2500°K, taking into account the actual variations with temperature of the various parameters involved, as reported by Jones and Langmuir (1927). The analysis leads to the conclusion that the temperature-time relationship is exponential throughout the range. The time constant is shown to be proportional to the diameter of the filament and T f-4.2 where Tf is the final temperature of the filament. The results of the analysis are applied to derive the voltage variations (continuous and discrete types) required to keep the transient current within specified limits during the rapid switching on of filaments as met with in high power thermionic valves.

Item Type:	Journal Article
Publication:	Journal of Scientific Instruments
Publisher:	Institute of Physics
Additional Information:	Copyright of this article belongs to Institute of Physics.
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	24 May 2010 10:44
Last Modified:	19 Sep 2010 06:07
URI:	http://eprints.iisc.ac.in/id/eprint/28114

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