Temperature profiles and thermal losses in 150 W high-intensity discharge lamps

Abstract

A series of 150 W quartz metal-halide test lamps containing four different chemistries has been studied with optical emission spectroscopy and x-ray absorption imaging. The four chemistries are pure Hg, Hg-HgI 2 , Hg-NaI and Hg-NaI-DyI 3. Core temperatures and comprehensive distributions of Hg vapour densities were measured and combined to obtain comprehensive gas temperature distributions. The concentrations of additives in these specially designed test lamps were found to be much smaller than is typical for a commercial metal-halide lamp. As a consequence, the core temperatures in all lamps are largely characteristic of a pure Hg discharge. The gas temperature distributions have been used to determine power losses resulting from thermal conduction through the Hg vapour. The fraction of total input power dissipated thermally was found to be 0.49 ± 0.01 in pure Hg, similar to published measurements for such lamps. In the Hg-NaI and Hg-NaI-DyI 3 lamps, thermal losses are 0.41 ± 0.01 and 0.42 ± 0.01, respectively. The Hg-HgI 2 lamp has thermal losses of 0.29 ± 0.03.

Infrared continuum radiation from high and ultra-high pressure mercury lamps

“…Figure 5 shows the arc temperature as a function of radius in the conventional Hg HID lamp. Temperature maps measured by Curry and Sansonetti (2004) and Curry et al (2005) on identical custom lamps from the same set of custom HID are in good agreement with the data of figure 5. Curry and Sansonetti (2004) used a version of the Bartels method.…”

Effect of spatial changes in broadening on self-absorbed lines and its impact on plasma diagnostics

“…A method of determining the inhomogeneity parameter from line-reversal was proposed many years ago [10]. This method was applied to a variety of arc lamps for general and automotive lighting applications in order to determine excitation, electron and gas temperatures [11][12][13][14][15][16][17].…”

Monte Carlo simulation of photon scattering in x-ray absorption imaging of high-intensity discharge lamps

“…A brief description of the process of x-ray absorption imaging as applied to HID lamps is useful in understanding some of the later discussion. More thorough descriptions can be obtained from references cited above [8][9][10][11][12]. Figure 1 shows a typical x-ray imaging measurement.…”