Non-electronic gain control

Details Non-electronic gain control Non-electronic gain control

G - Physics

01

J

325/1

G01J 1/06 (2006.01) G01J 1/04 (2006.01) G08B 13/18 (2006.01) G08B 13/19 (2006.01) G08C 23/04 (2006.01) H04B 10/06 (2006.01)

Patent

CA 1279372

ABSTRACT OF THE DISCLOSURE NON-ELECTRONIC GAIN CONTROL 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.

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