| 摘要 |
<p>There is described an optical seismic cable (2) comprising a number of sensor units (5) spaced along the length of the cable and a number of connection units (4) spaced along the length of the cable, the cable further comprising a number of first optical fibers extending substantially continuously along the cable from one connection unit to the next, and a number of second optical fibers which each extend part-way along the cable between adjacent connection units, and wherein at each connection unit at least one first optical fiber is joined to a second optical fiber, and wherein at the sensor units sensors are joined to said second optical fibers. A second aspect of the invention provides an optical seismic cable module (3) comprising a number of first optical fibers extending substantially continuously from one end of the cable module to the other, and a number of second optical fibers which each extend part-way along the cable module, the seismic cable module further comprising at one end a connection unit at which at least one first optical fiber is joined to a second optical fiber, and a number of sensor units at which sensors are joined to second optical fibers.</p> |
