Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1977-08-31
1979-04-03
Grimm, Siegfried H.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250227, 313 94, 313 95, H01J 3906, H01J 3912, H01J 3916
Patent
active
041479297
ABSTRACT:
A device for detecting optical energy signals in an optical path is provi by combining a layer of photoemissive material overlying the optical path and a grounded first electrode positioned in electrical contact with the layer of photoemissive material; a second electrode is positioned in spaced, preferably parallel relationship from the first grounded electrode and a source of dc potential is connected across the electrodes. Upon the transmission of optical energy signals along the optical path, commensurate electrical signals are produced across a load resistance which is connected between the second electrode and the high potential side of the dc potential source. Alternatively the concept may be embodied in a photomultiplier responsive to signals in an optical path. In this embodiment a plurality of dynodes are positioned between the first and second electrodes, spaced at gradually increased distances from the layer of photoemissive material. Optical energy signals transmitted along the optical path are thereby detected and multiplied by the electron emission produced at each successive dynode to produce commensurate multiplied signals at a load resistance connected between the second electrode and the source of dc potential. Both of these devices are preferably contained within an evacuated enclosure to enhance electron emission.
REFERENCES:
patent: 2867729 (1959-01-01), Morton et al.
patent: 3310701 (1967-03-01), Heimann
patent: 3435233 (1969-03-01), Farnsworth
patent: 3475076 (1969-10-01), Nelson
patent: 3873829 (1975-03-01), Evrard et al.
patent: 3896305 (1975-07-01), Ostrowsky et al.
Grimm Siegfried H.
McLaren J. W.
Rubens G. J.
Sciascia R. S.
The United States of America as represented by the Secretary of
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