| 摘要 |
PURPOSE:To eliminate effect of directional pattern by arranging three auxiliary electrode bodies parpendicular to each other with metal plates opposed thereto as a voltage is induced by a space electric field to optically measure the induced voltage with a voltage sensor. CONSTITUTION:Auxiliary electrode bodies 11Y are arranged in a space electric field perpendicular to each other in the directions X, Y and Z and voltages are induced in metal plates 11a of the auxiliary electrode bodies corresponding to directions thereof to be applied to corresponding voltage sensors. On the other hand, lights proportional to the induced voltages of the voltage sensors are sent out through optical fibers 2X', 2Y' and 2Z'. Signal from light receiving elements are processed via a signal component detection circuit, a signal component effective value detection circuit and a squaring circuit to calculate the intensity of an electric field. A division circuit outputs components signals in the direction X, Y and Z of the space electric field from an effective value square sum signal and an effective value signal inputted via 1/2 multiplication circuit. |
