Eur. Phys. J. Appl. Phys.
Volume 34, Number 2, May 2006
|Page(s)||117 - 121|
|Section||Characterization of Materials: Imaging, Microscopy and Spectroscopy|
|Published online||18 May 2006|
A theory of filament lamp's failure statistics
Department of Physics, Banaras Hindu University, Varanasi 221005, India
2 Department of Farm Engineering, Banaras Hindu University, Varanasi 221005, India
Corresponding author: email@example.com
Revised: 8 March 2006
Accepted: 17 March 2006
Published online: 18 May 2006
We model the ejection of tungsten atoms from a hot filament by a binomial distribution. A normal approximation is made and the lamp is supposed to fail if the undecayed atomic fraction drops below a critical value. The resulting formula for the lamp survival probability has no free parameter and is shown to be in excellent agreement with the experimental mortality curve.
PACS: 79.40.+z – Thermionic emission / 02.50.Ey – Stochastic processes
© EDP Sciences, 2006
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