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    • 163. 发明授权
    • Optical transmission of digital seismic data
    • 数字地震数据的光传输
    • US4408307A
    • 1983-10-04
    • US209638
    • 1980-11-24
    • Ralph A. Harris
    • Ralph A. Harris
    • G01V1/22H04B10/29H04L25/45H04L25/49
    • H04B10/29G01V1/22H04L25/45H04L25/4904
    • An optical fiber cable is used as the transmission medium for data and status signals from remote digital acquisition units to a master station of a distributed digital field system. Each digital acquisition unit has associated with it one or more sensors for sensing motion in an elastic body. The master station of the system also uses an optical fiber cable as the transmission medium for transmitting command signals to the digital acquisition units. The digital acquisition units, when first connected into the system, sense the master station signal and determine which direction to transmit. In normal operation, one digital acquisition unit receives the master station command and repeats the command to the next digital acquisition unit and so on. The digital acquisition units then reverse direction of transmission and reception, the data acquisition unit receiving from an adjacent digital acquisition unit and repeating data or status signals, then adding its own data or status signal onto the line before passing it to the next digital acquisition unit in the direction of the master station. The optical fiber cable transmission medium provides extremely high bandwidths permitting very high data rates and large numbers of channels and also provides complete immunity from electromagnetic radiation.
    • 使用光纤电缆作为从远程数字采集单元到分布式数字现场系统的主站的数据和状态信号的传输介质。 每个数字采集单元与其相关联一个或多个用于感测弹性体中的运动的传感器。 系统的主站还使用光纤电缆作为用于向数字采集单元发送命令信号的传输介质。 数字采集单元首次连接到系统中时,感测主站信号并确定要发送的方向。 在正常操作中,一个数字采集单元接收主站命令并将命令重复到下一个数字采集单元等。 数字采集单元然后反向发送和接收方向,数据采集单元从相邻数字采集单元接收并重复数据或状态信号,然后将其自身的数据或状态信号添加到线路上,然后再将其传送到下一个数字采集单元 在主站的方向。 光纤电缆传输介质提供极高的带宽,允许非常高的数据速率和大量的信道,并且还提供完全的电磁辐射免疫。