Abstract

The operation of an incandescent filament on alternating current of the form, i = i0 sinωt, is reviewed. A model for the ac evaporation rate, in a vacuum of a uniformly heated straight wire, is presented in terms of: (1) The known temperature fluctuations, and (2) The evaporation rate evaluated at the do and the ac mean filament temperatures. It is shown that the ac evaporation rate can be significantly greater than the dc evaporation rate. A method of evaluating the ac evaporation rate in terms of the spectral modulation is developed.

© 1963 Optical Society of America

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