Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1979-01-03
1981-01-27
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250205, H01J 4014
Patent
active
042477654
ABSTRACT:
An opto-electronic detector has a radiation-emitting element and a radiation receiving element which are linked optically and also by an electronic circuit so that the radiation-emitting element is caused to produce radiation pulses due to feedback between the radiation-emitting and receiving elements.
The construction of the electronic circuit is such that sharp pulses are produced having an amplitude and frequency dependent on the optical feedback factor, and such that the pulses are spaced by intervals in which the radiation-emitting element is entirely extinguished.
The electronic circuit comprises a current amplifier (T2) which feeds the radiation-emitting element (D1). This amplifier is controlled by the radiation-receiving element (T1) and by a filter (R1C1) which incorporates a storage element such as a capacitor. The control of the amplifier (T2) is effected via an input of the amplifier which has a low impedance in the forward direction and a high impedance in the reverse direction so that increasing current transients in a load circuit (R3) of the amplifier are selectively amplified by optical feedback.
REFERENCES:
patent: 3631250 (1971-12-01), VanBuskirk
patent: 3721123 (1973-03-01), Heim
patent: 4054795 (1977-10-01), Kinder
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