Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1992-05-05
1993-11-30
Chilcot, Jr., Richard E.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359152, 359158, H04B 1000
Patent
active
052670708
ABSTRACT:
An underwater communications system comprising first and second communications modules which transmit and receive data utilizing infrared radiation. Each module has a transmitter/receiver which converts each received data byte to RS-232 formatted data for transmission to a computer. Each communication module also includes a timer for providing a forty kilohertz pulsed signal to modulation circuitry which passes the pulsed signal through the modulation circuitry when a logic zero is supplied to the modulation circuitry and which inhibits the pulsed signal when a logic one is supplied to the circuitry. That portion of the pulsed signal which passes through the modulation circuitry is provided to a light emitting diode which transmits a pulsed burst of infrared radiation to an infrared light detecting unit within the second communications module. The infrared light detecting unit then provides a logic zero at its output when its receives a pulsed burst of infrared radiation for time period of approximately six hundred microseconds and a logic one when the unit fails to detect a pulsed burst of infrared radiation for a time period of six hundred microseconds.
REFERENCES:
patent: 4975926 (1990-12-01), Knapp
Infrared Microbroadcasting Network for in-house data communication, IBM Zch Research Laboratory, 8803 Ruschikon, Switzerland.
Kruchowy Roman
Miller James G.
Stewart Ian H.
Bacares Rafael
Chilcot Jr. Richard E.
Kalmbaugh David S.
Sliwka Melvin J.
The United States of America as represented by the Secretary of
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