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STUDY OF TV-TYPE RADIOMETRIC SYSTEMS.
SYLVANIA ELECTRONIC SYSTEMS WALTHAM MASS APPLIED RESEARCH LAB
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A study was made of the video response of an image orthicon camera to point source illumination. Experimental results are presented on the response to a single point source that is fixed or changing in intensity of radiation. Experimental results are also presented on the resolution of two point sources and the video response of the two sources when one is changing in intensity or position. For adjacent point sources that differ greatly in intensity the response of the camera was non-linear. The presence of the bright source sometimes completely obliterated the response of the dimmer. The experimental measurements included the effects of variation in point source radiation as well as that of background lighting and TV camera operating parameters. Theoretical results have been obtained on defocussing in the image section of the camera, diffusion of charge on the target, and the trajectory of electrons in the read-out beam current. Preliminary results indicate deflection of electrons by a large point charge on the target may partially cause both the spreading of response to high intensity signals as well as the disappearance of the weak point source adjacent to a strong one. Author
APPROVED FOR PUBLIC RELEASE