Non-electronic gain control

Details Non-electronic gain control Non-electronic gain control

1987-07-30

1989-04-25

LaRoche, Eugene R.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250216, 350354, G02F 101

Patent

active

048250759

ABSTRACT:
A receiver for a radiated electromagnetic signal includes elements that respectively transmit a high percentage and a low percentage of the incident signal, in combination with a detector. The device is adapted for mounting on or near a horizontal surface, such as a ceiling. The signal is preferably in the infrared region of the spectrum. The receiver provides non-electronic gain control and, when the high-transmission element passes the signal wavelength preferentially over other wavelengths, it also provides improved noise immunity.

REFERENCES:
patent: 4314743 (1982-02-01), Rast
patent: 4514630 (1985-04-01), Takahashi
patent: 4514631 (1985-04-01), Guscott
patent: 4546248 (1985-10-01), Craig

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