Electrode diagnostics and modelling for ceramic metal halide lamps

G.M.J.F. Luijks, S. Nijdam, H. Esveld

Research output: Contribution to journalArticleAcademicpeer-review

42 Citations (Scopus)

Abstract

Electrode temperature diagnostics and a two-dimensional electrode model have been developed to improve our understanding of electrode behaviour in ceramic metal halide lamps. Using transparent YAG arc tubes in dc and ac operation, anode and cathode characteristics, like the effective work function, anode fall and electrode input power, could be derived from the measured temperature profiles. It is found that Dy-iodide in the metal halide lamp filling has a strong so-called gas-phase emitter effect. In order to improve our understanding of the observed phenomena and to help design electrodes for future lamps, a rotational symmetric two-dimensional electrode model has been created. The model is completely phase resolved so that time-dependent effects can be studied (both ac and dc). Furthermore, it contains various options for calculating the power input distribution, including a complex cathode sheath model as well as a simple anode model. The model has been shown to predict spot/diffuse transitions (in Hg-lamps with heavy electrodes/low currents) very similar to the behaviour seen in real lamps.
Original languageEnglish
Pages (from-to)3163-3169
JournalJournal of Physics D: Applied Physics
Volume38
Issue number17
DOIs
Publication statusPublished - 2005

Fingerprint

Metal halide lamps
metal halides
luminaires
ceramics
Electrodes
electrodes
Electric lamps
Anodes
anodes
Cathodes
cathodes
Electron tubes
Iodides
low currents
sheaths
temperature profiles
yttrium-aluminum garnet
iodides
emitters
arcs

Cite this

Luijks, G.M.J.F. ; Nijdam, S. ; Esveld, H. / Electrode diagnostics and modelling for ceramic metal halide lamps. In: Journal of Physics D: Applied Physics. 2005 ; Vol. 38, No. 17. pp. 3163-3169.
@article{acf650e625114d81babe213a753a4478,
title = "Electrode diagnostics and modelling for ceramic metal halide lamps",
abstract = "Electrode temperature diagnostics and a two-dimensional electrode model have been developed to improve our understanding of electrode behaviour in ceramic metal halide lamps. Using transparent YAG arc tubes in dc and ac operation, anode and cathode characteristics, like the effective work function, anode fall and electrode input power, could be derived from the measured temperature profiles. It is found that Dy-iodide in the metal halide lamp filling has a strong so-called gas-phase emitter effect. In order to improve our understanding of the observed phenomena and to help design electrodes for future lamps, a rotational symmetric two-dimensional electrode model has been created. The model is completely phase resolved so that time-dependent effects can be studied (both ac and dc). Furthermore, it contains various options for calculating the power input distribution, including a complex cathode sheath model as well as a simple anode model. The model has been shown to predict spot/diffuse transitions (in Hg-lamps with heavy electrodes/low currents) very similar to the behaviour seen in real lamps.",
author = "G.M.J.F. Luijks and S. Nijdam and H. Esveld",
year = "2005",
doi = "10.1088/0022-3727/38/17/S17",
language = "English",
volume = "38",
pages = "3163--3169",
journal = "Journal of Physics D: Applied Physics",
issn = "0022-3727",
publisher = "Institute of Physics",
number = "17",

}

Electrode diagnostics and modelling for ceramic metal halide lamps. / Luijks, G.M.J.F.; Nijdam, S.; Esveld, H.

In: Journal of Physics D: Applied Physics, Vol. 38, No. 17, 2005, p. 3163-3169.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Electrode diagnostics and modelling for ceramic metal halide lamps

AU - Luijks, G.M.J.F.

AU - Nijdam, S.

AU - Esveld, H.

PY - 2005

Y1 - 2005

N2 - Electrode temperature diagnostics and a two-dimensional electrode model have been developed to improve our understanding of electrode behaviour in ceramic metal halide lamps. Using transparent YAG arc tubes in dc and ac operation, anode and cathode characteristics, like the effective work function, anode fall and electrode input power, could be derived from the measured temperature profiles. It is found that Dy-iodide in the metal halide lamp filling has a strong so-called gas-phase emitter effect. In order to improve our understanding of the observed phenomena and to help design electrodes for future lamps, a rotational symmetric two-dimensional electrode model has been created. The model is completely phase resolved so that time-dependent effects can be studied (both ac and dc). Furthermore, it contains various options for calculating the power input distribution, including a complex cathode sheath model as well as a simple anode model. The model has been shown to predict spot/diffuse transitions (in Hg-lamps with heavy electrodes/low currents) very similar to the behaviour seen in real lamps.

AB - Electrode temperature diagnostics and a two-dimensional electrode model have been developed to improve our understanding of electrode behaviour in ceramic metal halide lamps. Using transparent YAG arc tubes in dc and ac operation, anode and cathode characteristics, like the effective work function, anode fall and electrode input power, could be derived from the measured temperature profiles. It is found that Dy-iodide in the metal halide lamp filling has a strong so-called gas-phase emitter effect. In order to improve our understanding of the observed phenomena and to help design electrodes for future lamps, a rotational symmetric two-dimensional electrode model has been created. The model is completely phase resolved so that time-dependent effects can be studied (both ac and dc). Furthermore, it contains various options for calculating the power input distribution, including a complex cathode sheath model as well as a simple anode model. The model has been shown to predict spot/diffuse transitions (in Hg-lamps with heavy electrodes/low currents) very similar to the behaviour seen in real lamps.

U2 - 10.1088/0022-3727/38/17/S17

DO - 10.1088/0022-3727/38/17/S17

M3 - Article

VL - 38

SP - 3163

EP - 3169

JO - Journal of Physics D: Applied Physics

JF - Journal of Physics D: Applied Physics

SN - 0022-3727

IS - 17

ER -