Analysis of Noise in the Image Orthicon

The problem of how to design a camera tube to operate at light flux levels lower than those presently used without reduction of the signal-to-noise ratio is examined. It is shown that any increase in photocathode sensitivity or mesh transmission allows a corresponding reduction in the light required for equal performance. On the other hand, increases in the secondary-emission ratio of the target or the first dynode, even if indefinitely large, can only produce a limited reduction in the light required for equal performance.

Print ISSN

0361-4573

Published

1961-06

Content type

Original Research

DOI

10.5594/J07813