Patent ID: 9715029
Date: 2017-07-25
CPC Classifications: G01R,G01V,Y02A

Claim:
1. An electric field sensor for underwater, comprising: a sensing unit that is installed on a seabed and has a portion exposed to underwater environment, the sensing unit sensing a change in an electric field and transferring a sensing signal of the electric field to a signal line; a waterproof sealing unit that keeps a signal transferring portion of the sensing unit in a waterproof state; and a water-passing protection unit that shields and protects an exposed portion of the sensing unit while allowing water to move in and out thereof; wherein the sensing unit includes: a nonconductive hollow pipe having a tubular body and an outer surface to which the signal line is connected, a sheet of carbon fiber that is wound around the outer surface of the hollow pipe, has a portion exposed to underwater environment, and senses an electric field, and a terminal ring that is electrically conductively installed at a first end portion of the sheet of carbon fiber to provide a connection portion of the signal line and that is watertightly sealed by the waterproof sealing unit.