Study of the influence of additive on the radiative properties of a HgTℓI high pressure discharge

Bouaoun, Mohamed; Elloumi, Hatem; Troudi, L.; Chammam, Abdeljelil; Charrada, K.; Stambouli, Moncef

doi:10.1088/0022-3727/43/18/185205

Cited by 7 publications

(2 citation statements)

References 12 publications

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“…The line reversal and the red wing of the line fit closely to the experimental values, the main discrepancy occurring in the outer blue wing. A similar discrepancy was found by Bouaoun [21], where the method DOM was used to resolve the RTE. This discrepancy may be due to the approximations used in the model: only broadening by Hg atoms is considered, diffusion of atoms from the centre and convection in the cold outer regions is neglected, and the atomic ratio mercury/thallium is considered constant throughout the discharge.…”

Section: Calculations Of Photometric Propertiessupporting

confidence: 75%

Study of photometric properties of high-pressure mercury discharge with thallium iodide additives (HgTℓI) using the ray-tracing method

Hamady¹,

Lister²,

Aubès³

et al. 2011

J. Phys. D: Appl. Phys.

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The photometric properties of HgTℓI high intensity discharge (HID) lamps have been calculated by solving the radiation transport equations in the discharge, using the ray-tracing method. The partial pressures of the various chemical species in the plasma are computed assuming the plasma is in local thermodynamic equilibrium (LTE), using a curve fit to an experimentally measured temperature profile. The plasma is also assumed to be fully mixed, implying a constant mercury/thallium ratio throughout the discharge tube. The spectral line broadening includes neutral Van der Waals and charged particle Stark broadening. The potential influence of ‘de-mixing’ on the spectra is also considered.

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Section: Calculations Of Photometric Propertiessupporting

confidence: 75%

Study of photometric properties of high-pressure mercury discharge with thallium iodide additives (HgTℓI) using the ray-tracing method

Hamady¹,

Lister²,

Aubès³

et al. 2011

J. Phys. D: Appl. Phys.

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“…In the opposite case, if the ionisation level is lower than 10 À4 and the excited particles are at a temperature which is different from that of atoms, the plasma is assumed to be out of local thermodynamic equilibrium. 11 For the modelling of the discharge lamp, we described the conductance g(I) by a simple equation 12,13 dg t…”

Section: The Conductance Modelmentioning

confidence: 99%

Assessment of the effect of a pulsed power supply on the HgTlI lamp

Chammam

Nsibi

Mrabet

et al. 2018

Lighting Research & Technology

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The objective of this work is to study the influence of a pulsed power supply on the energy efficiency of high-intensity discharge lamps in comparison with a pseudo-continuous ballast. The results presented in this paper concern the dynamic behaviour of discharges in mercury vapour doped with thallium iodide. The acquisition of the arc current, arc voltage and spectral radiation enables us to investigate the influence of the pulsed power supply on the electrical characteristics of the lamp such as the behaviour of the lamp conductance and spectral radiance. The analysis of the 577 nm mercury line’s response to the current pulse excitation allowed us to identify several phases. Good agreement has been found between simulation and experimental results.

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Two-dimensional HID light source radiative transfer using discrete ordinates method

2016

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This paper shows the implementation of the Discrete Ordinates Method for handling radiation problems in High Intensity Discharge (HID) lamps. Therefore, we start with presenting this rigorous method for treatment of radiation transfer in a two-dimensional, axisymmetric HID lamp. Furthermore, the finite volume method is used for the spatial discretization of the Radiative Transfer Equation. The atom and electron densities were calculated using temperature profiles established by a 2D semi-implicit finite-element scheme for the solution of conservation equations relative to energy, momentum, and mass. Spectral intensities as a function of position and direction are first calculated, and then axial and radial radiative fluxes are evaluated as well as the net emission coefficient. The results are given for a HID mercury lamp on a line-by-line basis. A particular attention is paid on the 253.7 nm resonance and 546.1 nm green lines.

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Study of the influence of additive on the radiative properties of a HgTℓI high pressure discharge

Cited by 7 publications

References 12 publications

Study of photometric properties of high-pressure mercury discharge with thallium iodide additives (HgTℓI) using the ray-tracing method

Study of photometric properties of high-pressure mercury discharge with thallium iodide additives (HgTℓI) using the ray-tracing method

Assessment of the effect of a pulsed power supply on the HgTlI lamp

Two-dimensional HID light source radiative transfer using discrete ordinates method

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