Abstract:There is still great interest in studying high intensity discharge (HID) lamps despite the great development of other light sources like light emitting diodes (LEDs). Basic equations and numerical formulations allow calculating important terms such as the net emission coefficient (NEC) that plays an important role in understanding the radiation behaviour of these lamps. These lamps are considered to be at high pressure and the produced plasma was found to be at local thermodynamic equilibrium (LTE). The volume of the lamp is meshed into small cells and the total number of cells represents a compromise between correct results and calculation time. Each cell has its own local absorption and emission coefficient that applies to its position in the discharge. Line profile is calculated by two profiles convolution: one is Lorentz’s and the second one is a quasi-static profile. Ray tracing technique is used to resolve the radiation transport for the visible and ultra violet (UV) spectrum. The NEC is thus calculated and compared with other models for a pure mercury discharge. In addition, additional photometric properties of the lamp are obtained.
References:1. Derra G., Moench H., Fischer E., Giese H., Hechtfischer U., Heusler G., Koerber A., Niemann U., Noertemann F.-C., Pekarski P., Pollmann-Retsch J., Ritz A., Weichmann U. UHP lamp systems for projection applications // Journal of Physics D: Applied Physics, 2005. V38, #3, pp. 2995. 2. Cressault Y., Teulet P., Zissis G. Radiative properties of ceramic metal-halide high intensity discharge lamps containing additives in argon plasma / / Japanese Journal of Applied Physics, 2016. V55, #7S2, pp. 07LB05. 3. Simonet F., Aubes M., Elloumi H., Sarroukh H. Optimization of the spectruml flux computation for cylindrical discharges // Journal of Quantitative Spectroscopy and Radiative Transfer, 1999. V61, #2, pp. 197. 4. Lochte-Holtegreven W. Plasma Diagnostics. North Holland Publishing Company, 1968. 5. Leibermann R.-W., Lowke, J.-J. Radiation emission coefficients for sulfur hexafluoride are plasmas // Journal of Quantitative Spectroscopy and Radiative Transfer, 1976. V16, #3, pp. 253. 6. Sevast’yanenko V.-G., Soloukhin R.-I., Golovnev I.-F., Zamurayev V.-P., Katsnel’son V.-P., Koval’skaya, G.-A., Goulard R. Radiative Heat Transfer in High Temperature Gases. Springer, 1987. 7. Lowke J.-J., Capriotti E.-R. Calculation of temperature profiles of high-pressure electric arc using the diffusion approximation for radiation transfer // Journal of Quantitative Spectroscopy and Radiative Transfer, 1969. V9, #2, pp. 207. 8. Stromberg H.-P., Schafer R. Time-dependent behaviour of high-pressure mercury discharges // Journal of Applied Physics, 1983. V54, #8, pp. 4338. 9. Jones B.-F., Mottram D.-A.-J. A semi-empirical formula to describe the net emission coefficient of self-absorbed spectruml lines for use in modeling high-pressure discharge lamps // Journal of Physics D: Applied Physics, 1981. V14, #7, pp. 1183. 10. Bouaoun M., Elloumi H., Charrada K., Rhouma B.-E.-H., Stambouli M. Discrete ordinates method in the analysisof the radiative transfer in high intensity discharge lamps // Journal of Physics D: Applied Physics, 2005. V38, #22, pp. 4053. 11. Hamady M., Lister G.-G., Zissis G. Calculations of visible radiation in electrodeless HID. 12. Lamps // Journal of Lighting Research and Technology, 2016. V48, #4, pp. 502. 13. Galvez M. Ray tracing model for radiation transport in three-dimensional LTE systems // Journal of Physics D: Applied Physics, 2005. V38, #17, pp. 3011. 14. Hamady M., Lister G.-G., Aubès M., Zissis G. Study of photometric properties of high-pressure mercury discharge wit thallium iodide additives (HgTlI) using the ray-tracing method // Journal of Physics D: Applied Physics, 2011. V44, #10, pp. 5201.
- high intensity discharge (HID)
- radiation transport
- ray tracing
- net emission coefficient (NEC)
- line broadening
- local thermodynamic equilibrium (LTE)
- luminous flux
- luminous efficacy
- correlated colour temperature (CCT)
Status of Lighting Technologies in Nepal. L&E 27 (6) 2019
Mapping the Needs for Trained Lighting Engineers in Construction Industry: The First Outcomes from ECOSLIGHT Skills Alliances European Project L&E, Vol. 29, No. 6, 2021
Design and Survey of Lighting and Colour Ambience for a Suitable Elderly Environment L&E 28 (1) 2020