Solid-state image intensifier under dynamic operation

This paper presents experimental and theoretical analyses of time-delay phenomena exhibited by solid-state image intensifiers of the photoconductor-electroluminescent-phosphor type. These phenomena are usually due to the photoconductor, frequently cadmium sulfide or cadmium selenide, which responds slowly to changes in the level of input radiation. The photoconductor is assumed to be ohmic and to have a conductance depending on a power of the radiation level. The electroluminescent output is assumed to depend on a power of the voltage applied across the layer. Three cases are considered: 1. Static characteristic. The output is determined after the input radiation has been incident for a long time. This condition is of interest when gain is desired but time is not a factor. 2. Instantaneous dynamic characteristic. The output is considered immediately after a short exposure. This condition is of interest for visual observation with an X-ray input. 3. Integrated dynamic characteristic. The output energy is considered as a function of the input energy of a short exposure. This condition is of interest when an X-ray input is involved and the output is recorded on photographic film.