| 摘要 |
Method and apparatus for communicating between a ship and a seismic cable depth controlling apparatus which is attached to a seismic cable for the purpose of maintaining the seismic cable at a constant or predetermined depth which essentially comprises a generator on board ship applying a predetermined AC signal to a conductor along the length of the seismic cable. A toroidal core is clamped around the seismic cable and intercepts the current passing down the cable and converts the intercepted flux to an electrical signal which is applied to the control system of the cable depth controller. |
