Photoemissive Cathodes: I. Photoemissive Surfaces in Imaging Devices
Except for tubes of the vidicon type, all photoelectronic imaging tubes in current use employ as their light-to-electron conversion medium a photo-emissive layer. The surface largely determines the range of spectral sensitivity and maximum detective performance of the device. Some of the early camera tubes (the single-sided target iconoscope and one type of image dissector) used opaque photosurfaces; however, all modern camera tubes and essentially all image intensifiers and image converters use semitransparent photosurfaces.* The characteristics then of photosurfaces in photo-electronic imaging tubes are those of semitransparent surfaces in combination with the supporting window material.
KeywordsSpectral Response Thermionic Emission Dark Current Radiant Sensitivity Electron Volt
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