Title: Threshold signal circuitry for scanning apparatus

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.

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Inventors: Schoon, David J. (Marine on St. Croix, MN, US)

Application Number: 466976
Filing Date: 1974-05-06
Publication_date: 1976-01-20
Assignee: Minnesota Mining and Manufacturing Company (St. Paul, MN)
Primary Class(es): 250/214R 250/559.39
Other Classes:
US Patent Ref:

3465169	Sep, 1969	Foerster	250/214.
3560757	Feb, 1971	Pugsley	250/226.
3809892	May, 1974	Schober	250/226.
3835247	Sep, 1974	Soames	250/563.

Other Refs:
Primary Examiner: Lawrence, James W.
Assistant Examiner: Nelms, D. C.
Attorney: Alexander, Sell, Steidt & DeLaHunt