A theoretical development has been applied to vidicon and orthicon types of image tubes which is similar to that used for ir photodetectors. In essence, a differential equation applicable to these image tubes has been used to obtain exact solutions for signal and noise. These expressions account for factors such as storage, frequency response, resolution, and efficiency. They can be inserted into the usual definitions of noise equivalent power, detectivity star, and detective quantum efficiency to provide exact expressions indicating the dependence of these quantities on basic factors governing tube generation. Experimental procedures are proposed for making signal and noise measurements which provide information directly comparable to those for photodetectors.

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