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The Evaluation of Cascade Phosphor-Photocathode Screens

Elsevier Science & Technology
DOI: 10.1016/s0065-2539(08)61670-4


Publisher Summary This chapter focuses on different screen characteristics such as efficiency, image resolution, freedom from pin-holes, screen texture, etc. with special reference to their suitability for cascade image intensifier screens for test of the prepared samples. The energy conversion efficiency of the phosphor screen may be defined as the ratio of the output light energy to the input electron energy. The results indicate that the relative efficiency of the phosphor screens with floated backings is 20-30% higher than that of the similar screens with conventional backings. The resolution of the electron image in each stage of a cascade image intensifier rail be very good, at least, 150 lp/mm, and the loss of resolution is due mainly to scattering of electrons and of the light they excite in the phosphor screen and in the spread of this light as it passes through the substrate from the phosphor to the photocathode film. Estimates of the image resolution of screens have been made, and an optical technique of image resolution measurement has been developed and assessed. The experimental results have been compared with the estimated values of image resolution.

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