CRT TARGET DETECTABILITY WITH TRANSPARENT AND OPAQUE PHOSPHORS

摘要

As part of a program of research on visual factors in cathode-ray tube (crt) display systems, the Naval Research Laboratory has studied display problems arising from envi?ronmental illumination. An investigation was made of the target detectability characteristics of a transparent and an opaque phosphor under moderate illumination conditions. The method of experimentation which was used involved the sim?ulation of a radar B-scope presentation. Independent vari?ables were crt grid bias (pedestal amplitude), receiver noise, and type of phosphor. Results indicate that for each phosphor least signal strength is required for detection when receiver noise is approximately maximal. With at least moderately high gain, detectability is approximately the same for a wide range of grid biases. There is no significant difference in detectability between the transparent and conventional-phosphor tubes under these optimal conditions.