THE THEORY AND DEVELOPMENT TECHNOLOGY OF THE SEA-FLOOR ELECTRIC FIELD SENSOR

Because of the faint electric field signal on sea-floor, the complex nature environment under the sea and chlorine ion as electric conduction in seawater, the material and the structure of the sea-floor electric field sensor is completely different from that of the electrode which is used on land. The development of the sea-floor electric field sensor becomes one of the important technologies for the marine MT prospecting. The main technical difficulties during the development are: the selection of the sea-floor electric field sensor′s material; the process of sensor making; the technology of the sealing and compressive stress bearing; the elimination of influence by the flowing water; the anti-jamming during the faint signal transmission; etc. In this paper, the solutions for above problems are described. The scheme of the sea-floor electric field sensor development, and some simulation study and sea experimentation results are given.