Vector electric field measurement using a non-interfering sensor

A system for measuring the amplitude and phase of three components of the e lectric field vector at 2450 MHz is described. It uses three optically modu lated phototransistors which disturb only weakly the electric field distrib ution. The authors also present two guide setups, for calibrating the sensor and f or evaluating its performance. The sensor can either be moved with a slidin g matched load inside the waveguide, or be positioned in the waveguide in f ront of a movable short circuit. The two procedures are compared.