Optical PT
Source: Idaho National Engineering Laboratory
Date: 10/1/95    Record No.: 10215
Contact: Todd Renak, 208-526-8706; Tom Sauerbrun, 208-526-8151

Optical PT
High Voltage meter is past proof of concept, and patent application is being prepared, so details are not available just yet. Works by measuring the electric field. Laser light passes through a length of optical fiber located adjacent to the conductor. The sensor package can be quite distant from the associated electronics, connected only by fiber optic cable. The basic idea is well known, but they've overcome major practical obstacles by finding a way to cancel out errors. They are also working on a DC version for use in electric vehicles.