Optical absorption spectroscopy on a metal-halide high intensity discharge arc lamp using synchrotron radiation

Abstract

A sensitive, spatially resolved optical absorption spectroscopy experiment using synchrotron radiation on metal-halide high intensity discharge (MH-HID) lamps was performed. This experiment was used to measure the absolute column densities of ground and excited level Sc atoms, ground level Sc+ ions, and ground level Na atoms in a 250 W MH-HID lamp during operation. The column densities were Abel inverted and used to determine the arc temperature as a function of radius and the absolute electron density as a function of radius. Although most of these measurements were made using a one-dimensional spectrally-multiplexed experiment, a two-dimensional spatially and spectrally multiplexed experiment has also been demonstrated. The absolute density and temperature maps from this experiment were used to determine the absolute near-infrared output power from the MH-HID lamp as described in the companion paper (Smith et al 2003).

Semi-empirical model for axial segregation in metal-halide lamps

“…To compare with earlier measurements where Fischer parameters were obtained, we introduce a corrected Fischer parameter which takes the temperature influence into account. This corrected parameter should follow the dependence of p, g and P as given in equation (7).…”

“…High intensity discharge (HID) lamps have a high efficiency (up to 40%) and a good colour rendering index [1][2][3][4][5][6][7][8][9]. They are for instance used for shop lighting, city beautification and street lighting.…”

Imaging laser absorption spectroscopy of the metal-halide lamp under hyper-gravity conditions ranging from 1 to 10g

“…The metal-halide (MH) lamp is a high intensity discharge lamp with a good colour rendering and a high luminous efficacy [1][2][3][4][5][6][7][8][9][10]. MH lamps are for instance used for street lighting, stadium lighting, city beautification and shop lighting.…”

The Metal-Halide Lamp Under Varying Gravity Conditions Measured by Emission and Laser Absorption Spectroscopy

“…They are high pressure lamps based on arc emission (Stormberg 1981;Rogoff et al 1987;Zollweg 1975;Dakin and Shyy 1989;Lister et al 2004;Bonvallet and Lawler 2003). These lamps are mainly used for outdoor applications; examples are shop lighting, street lighting, flood lighting of sport stadiums and city beautification.…”