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    • 6. 发明授权
    • Underwater IR communication system
    • 水下红外通信系统
    • US5267070A
    • 1993-11-30
    • US878697
    • 1992-05-05
    • Ian H. StewartJames G. MillerRoman Kruchowy
    • Ian H. StewartJames G. MillerRoman Kruchowy
    • H04B13/02H04B10/00
    • H04B13/02
    • 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.
    • 一种水下通信系统,包括利用红外辐射发射和接收数据的第一和第二通信模块。 每个模块都有一个发送器/接收器,用于将每个接收的数据字节转换为RS-232格式的数据,以传输到计算机。 每个通信模块还包括一个定时器,用于向调制电路提供四十kHz的脉冲信号,该调制电路当逻辑零被提供给调制电路时将脉冲信号通过调制电路,并且当逻辑1被提供给 电路。 通过调制电路的脉冲信号的该部分被提供给发射二极管,该发光二极管将脉冲的红外辐射脉冲发射到第二通信模块内的红外光检测单元。 然后,当红外光检测单元在其接收到大约六百微秒的时间周期的脉冲脉冲串的红外辐射时,在其输出端提供逻辑零,当该单元在一段时间内不能检测到脉冲的红外辐射时,逻辑1 六百微秒。