The slow-scan vidicon television camera is one of the principal instruments used by NASA in the unmanned exploration of the planets. Cameras of this type have already mapped the surface of Mars and will soon be sent to photograph Venus and Mercury. The unaided vidicon, however, lacks the sensitivity required for further improving the surface resolution at these inner planets, or for maintaining the present level of performance when missions are flown to planets further from the sun. Therefore, we have recently considered the use of a first generation image intensifier as a means for increasing the sensitivity of these cameras.
Terrence H. Reilly,
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