| Issue |
Eur. Phys. J. Appl. Phys.
Volume 34, Number 2, May 2006
|
|
|---|---|---|
| Page(s) | 117 - 121 | |
| Section | Characterization of Materials: Imaging, Microscopy and Spectroscopy | |
| DOI | https://doi.org/10.1051/epjap:2006044 | |
| Published online | 18 May 2006 | |
https://doi.org/10.1051/epjap:2006044
A theory of filament lamp's failure statistics
1
Department of Physics, Banaras Hindu University, Varanasi 221005, India
2
Department of Farm Engineering, Banaras Hindu University, Varanasi 221005, India
Corresponding author: dca_bhu@yahoo.com
Received:
23
September
2005
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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