Abstract
This chapter describes image intensifier tubes with intagliated screens. This Image intensifier tubes (IITs) are used in many applications, such as image detection at low light levels (night vision) or X-ray imaging. The image quality can be characterized by the modulation transfer function (MTF): output contrast versus spatial frequency for 100% input contrast. This function depends on several parameters, including photoelectron energy distribution, electron optics, micro channel pitch, screen granularity, and fiber-optic pitch. As the geometrical positions and the dimensions of the phosphor particles and fibers are completely independent of each other, the MTF of the screen on the fiber- optic is a combination of the phosphor screen MTF and the fiber-optic MTF. When the output screen is settled on a fiber-optic window, a further MTF improvement can be performed, as described in the chapter. To prevent the light passing into adjacent fibers, the lateral walls of the holes are metalized. As a result, photons emitted by the screen powder are kept inside the corresponding fiber.
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