Communications system

Details Communications system Communications system

1996-07-17

2009-12-29

Tarcza, Thomas H (Department: 3662)

Optical communications

Optical communication over freee space

Compensation

C398S126000, C398S130000, C359S237000

Reexamination Certificate

active

07639950

ABSTRACT:
A communications system incorporates a transmitter a receiver. The transmitter includes an infrared light emitting diode (LED). The LED output is positive or negative luminescence, i.e. above or below an equilibrium background intensity level respectively, according to the polarity of its bias signal. The receiver contains a lens to focus light from the LED onto a diode detector, from which signals pass to an amplifier, decoder and printer. Output signals from the LED have an average intensity equal to the equilibrium background intensity level and a frequency greater than 100 Hz or byte rate greater than 100 bytes/sec. They are not discernible by conventional thermal infrared imagers with frame rates of 50 Hz or less because integration in such an imager renders them indistinguishable from background.

REFERENCES:
patent: 4534064 (1985-08-01), Giacometti et al.
patent: 4851853 (1989-07-01), Mahoney
patent: 5748138 (1998-05-01), Telle et al.
patent: 0 196 347 (1986-10-01), None
patent: 776129 (1957-06-01), None
patent: 2 222 335 (1990-02-01), None

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