Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1982-03-15
1983-08-16
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
313574, 313542, H01J 3912
Patent
active
RE0313505
ABSTRACT:
An improved photodetector arrangement comprises positioning a photodetector having at least one semitransparent cathode so that the light beam striking the cathode passes through it at least twice before exiting from the photodetector. In another embodiment of the invention, a second photodetector is positioned relative to a first photodetector so that the light beam, after striking the first photodetector, strikes the second photodetector. Where the two photodetectors are employed, they may be electrically connected in parallel.
REFERENCES:
patent: 3218196 (1965-11-01), Jensen et al.
patent: 3609353 (1971-09-01), Paine
patent: 4070112 (1978-01-01), Tsunazawa et al.
Chamran Morteza M.
Dimovski Milan R.
Giarratana S. A.
Hays R. A.
Masselle F. L.
Nelms David C.
The Perkin-Elmer Corporation
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