Abstract

A number of electrooptical and optical devices developed in recent years, such as electronic image intensifiers, high sensitivity image orthicon tubes with a thin film target, and high resolution fiber optics, enable one to design a practical image intensifier television camera system. Such a system will operate at light levels below the threshold sensitivity of the human eye and produce useful images on real time basis. One practical application of such a system is the observation of Gaussian and diffraction images produced by an electron microscope. Extended periods of observations of various specimens are being made at a much reduced electron beam current density level where irradiation from the electron beam bombardment will not harm or alter the original characteristics of the specimen. Under the reduced beam density level, the light output from the microscope viewing screen is of such low light level that direct observation is impossible.

© 1967 Optical Society of America

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