Threshold signal circuitry for scanning apparatus

Details Threshold signal circuitry for scanning apparatus Threshold signal circuitry for scanning apparatus

1974-05-06

1976-01-20

Lawrence, James W.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250563, H01J 3912

Patent

active

039341364

ABSTRACT:
Circuitry providing a scanning threshold for a scanning apparatus in response to the output of a photomultiplier of the apparatus produced during a threshold determining scan of the field uses a first memory circuit to store a signal level indicative of the maximum light intensity sensed by the photomultiplier with a second memory circuit provided to store a signal level indicative of the minimum light intensity sensed. A threshold circuit connects with the stored signals to provide a threshold signal intermediate the two stored signal levels. An inhibiting circuit may be provided to prevent the second memory circuit from responding to signals below a predetermined level. Inhibiting circuitry and memory deletion circuitry are used to condition the memories prior to and immediately following a threshold determining scan.

REFERENCES:
patent: 3465169 (1969-09-01), Foerster
patent: 3560757 (1971-02-01), Pugsley
patent: 3809892 (1974-05-01), Schober
patent: 3835247 (1974-09-01), Soames

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