Abstract
The effect of the optical properties of phosphor screens on brightness and resolution has been studied both theoretically and experimentally. For this purpose, a computer model has been developed allowing the simulation of the light propagation in phosphor screens. From the model calculations the light output including its angular distribution, as well as the resolution, can be obtained. The influence of several screen parameters such as scattering and absorption behavior, reflectance of the Al film, and layer thickness on the screen performance is theoretically investigated. Experimentally, light output and resolution measurements have been carried out on phosphor powder screens varying in phosphor composition, screen weight, and grain size distribution. The experimental data corroborate the results of the theoretical model and let us conclude that the model can be used as a powerful tool for the design of the optical properties of phosphor powder screens with optimum light output and resolution.
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