Effectiveness of recycling light in ultra-bright short-arc discharge lamps

Malul, Asher; Nakar, Doron; Feuermann, Daniel; Gordon, Jeffrey M.

doi:10.1364/oe.15.014194

Cited by 13 publications

(5 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A short arc lamp is a light source consisting of a sealed quartz glass bulb filled with gas, in which two tungsten electrodes are placed. Depending on the required brightness, the arc gap is set in a range from 1 mm to 10 mm, and the operating pressure is set between 1 MPa and 10 MPa [1][2][3]. The filling gas is generally mercury vapour or xenon.…”

Section: Introductionmentioning

confidence: 99%

Modeling of a xenon short arc lamp considering the behavior of tungsten vapour evaporated from electrodes

Maenaka¹,

Tashiro

Murphy

et al. 2019

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

The tungsten vapour produced from the electrodes during short arc lamp operation is transported by gas convection and then deposited on the inner quartz bulb wall to form a tungsten thin film, causing the wall to blacken. We have been able to consider important phenomena for the first time by developing a unified numerical simulation model incorporating relevant sub-models. These include the absorption of the radiant energy due to blackening of the lamp and the temporal variation in the lamp parameters. The validity of the numerical simulation model is first evaluated by comparison with experimental results. The basic characteristics of the lamp obtained using the model is found to be in good agreement with the experimental results and other research results. The influence of the bulb wall blackening is then examined. The temperature of the bulb is shown strongly affected by convective heat transfer from the hot gas, and the temperature rise of the bulb after blackening is found to be primarily governed by the absorption of the radiant energy by the tungsten thin film. Through the increase in the bulb temperature, the gas temperature in the bulb is also increased. This raises the operating pressure, which increases the stress on the bulb wall. Consequently, it is demonstrated that the probability of breakage gradually increases with time due to the blackening by tungsten vapour deposition.

show abstract

Section: Introductionmentioning

confidence: 99%

Modeling of a xenon short arc lamp considering the behavior of tungsten vapour evaporated from electrodes

Maenaka¹,

Tashiro

Murphy

et al. 2019

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…= -NA in /NA out ( 2 ) where the negative sign derives from the unfolded converging design (converging meaning that the caustic from the primary mirror forms in front of, rather than behind, the focal plane)…”

Section: Near-field Unfolded Aplanatsmentioning

confidence: 99%

High-irradiance reactor design with practical unfolded optics

Feuermann

Gordon

2008

SPIE Proceedings

Self Cite

View full text Add to dashboard Cite

“…Xenon short arc lamps (Xe lamps) [1][2][3][4] have good colour rendering properties as well as high brightness [5,6] and are mainly used as light sources for various devices [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the influence of buoyancy on gas convection of a horizontal xenon short arc lamp through 3D numerical simulation

Maenaka¹,

Tashiro²,

Murphy³

et al. 2020

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

When operating a xenon short arc lamp, tungsten vapour that evaporates from the electrodes is transported by gas convection to blacken the inner bulb wall. Since this reduces the output light intensity and increases the risk of lamp breakage, it is crucial to thoroughly understand the factors that govern gas convection to optimally control it to reduce blackening. Gas convection is complex, especially in horizontal lamps, because it is strongly affected by buoyancy. This study used 3D numerical simulation to investigate buoyancy’s influence on the gas convection of a horizontal xenon short arc lamp, which directly affects the blackening location. Gas convection, especially in the low flow velocity region, was strongly affected by the buoyancy, whose strength was mainly determined by the anode surface temperature. The gas convection in turn affected the bulb wall temperature and the W vapour transport and was reflected in the blackening location. This result indicates that the surface temperature of the anode, which was determined by the energy balance between the gas and anode, also affected the blackening location. Therefore, the emissivity of the anode surface was an important factor controlling the horizontal lamp’s gas convection.

show abstract

Effectiveness of recycling light in ultra-bright short-arc discharge lamps

Cited by 13 publications

References 8 publications

Modeling of a xenon short arc lamp considering the behavior of tungsten vapour evaporated from electrodes

Modeling of a xenon short arc lamp considering the behavior of tungsten vapour evaporated from electrodes

High-irradiance reactor design with practical unfolded optics

Investigation of the influence of buoyancy on gas convection of a horizontal xenon short arc lamp through 3D numerical simulation

Contact Info

Product

Resources

About