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Study of direct view photoelectronic imaging devices and systems at low light levels.

Performance of direct-view type low light level devices and systems is studied with the help of theoretical modelling and experimental investigations. A mathematical model is proposed for estimating the low light level performance of image-intensifier & image-converter tubes and the associated viewing systems. Analytical expressions are derived for the operating resolution of the imaging devices and the range & the minimum object size detectable by the systems, on the basis of component parameters which can be measured in the laboratory. Spectral correction factors are proposed which take into account the spectral variations in the ambient radiation distribution, the imaging device response and the object/background reflectance. A methodology is suggested for the design and optimization of active (image-converter based) and passive (image-intensifier based) viewing systems. More Info

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