| 摘要 |
<p>The present invention provides method for monitoring the movement of a first rock region in a mine relative to a second rock region in the mine, the method comprising the steps of: providing a first marker device and a second marker device, the first marker device adapted to emit an electromagnetic signal, the second marker device adapted to (i) detect the strength of the electromagnetic signal emitted by the first marker device, and (ii) wirelessly transmit information related to the detected electromagnetic signal directly or indirectly to a reader device, installing the first marker device in the first rock region, installing the second marker device in the second rock region, and monitoring the information on the detected electromagnetic signal on the reader device, wherein, in use, movement of the first rock region relative to the second rock region is indicated where the second marker device detects a decrease in the strength of the electromagnetic signal emitted by the first marker device.</p> |
