Apparatus for simultaneously detecting a plurality of discrete l

Details Apparatus for simultaneously detecting a plurality of discrete l Apparatus for simultaneously detecting a plurality of discrete l

1993-03-17

1994-08-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

307311, 307520, H01J 4014

Patent

active

053389255

ABSTRACT:
An apparatus (10) includes at least one detector circuit (12) having circuitry (14) for canceling background radiation, a signal amplifier stage (16) adapted to receive and amplify a signal from the detector circuit (12) and a plurality of discrete frequency detection circuits (18), the discrete frequency detection circuits having a common input (20) and a plurality of outputs (22).

REFERENCES:
patent: 4143264 (1979-03-01), Gilbert et al.
patent: 4366378 (1982-12-01), Simons et al.
patent: 4945255 (1990-07-01), Gamgee et al.

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