An Improved Optically Isolated ELF Electric Field Sensor

Abstract

The design, development, and construction details of a probe for measuring electric fields between 200 V/m and 200 kV/m with a nominal measurement error of one percent are described. The probe is comprised of two small hemispheres, less than four centimetres in radius, which are separated by a small insulated gap. The electronics are placed inside the sphere, and a fiber optic link carries the field strength information to the remote receiver/display unit.