Abstract

Laser Raman spectroscopy is used to nondestructively measure molecular species that are found in tungsten-halogen bulbs. In particular, reactions are studied in an experimental bulb filled with CBrF₃ in Kr. It was found that CBrF₃ decomposes after ~10 seconds of accumulated burn time of the filament, and that Br₂ forms and then decomposes. An unusually large Br₂ signal was found to result from resonance fluorescence, as well as possible resonance Raman scattering. In addition, it was found that the compounds HBr, CO, and SIF₄ formed and persisted in the bulb. Raman spectroscopy was also used to identify a solid deposit on the inside surface of the glass envelope as WO₃(s). Finally, the total pressure of the bulb was measured nondestructively by Rayleigh scattering.

Modulation of subminiature tungsten-halogen lamps

John N. Pike
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Spectral irradiance model for tungsten halogen lamps in 340–850 nm wavelength range

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An Incandescent Tungsten Source for Infrared Spectroscopy*

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