Radiation transport in non-isothermal systems has a broad interest in science, from astrophysics (stellar atmospheres) to laboratory plasmas (plasma implosions, gas discharges) and engineering applications such as in condensers, evaporators, melters, and metal halide lamps [1,2,3], In all these situations, radiation is emitted, absorbed, and scattered by the gas as radiation is transported. It is the objective of this presentation to describe a ray-tracing method to solve for the radiation transfer equation for LTE (local thermodynamic equilibrium) plasmas in 3-dimensional systems. The absorptivities and the temperatures of the participating media are assumed to be known. The result of the calculation for an HID lamp will provide the net emission coefficients and the integrated spectrum for a very fine spectrum resolution of 10000-20000 wavelength points.
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