| 摘要 |
<p>A system (100), method and device may be used to monitor conditions in a borehole. Well tubing and casing (120) act as a conductive pair for delivering power to one or more downhole active sensors (124, 310). At the surface, power and signal are isolated so that the same conductive pair may act to transmit the sensor signals to the surface. In an embodiment, the sensor signals are RF signals and the surface electronics (112, 114, 118) demodulate the RF signals from the sensor power.</p> |
