METHOD AND APPARATUS FOR MEASURING MAGNETIC FIELD, METHOD FOR MEASURING CURRENT WAVEFORM AND METHOD FOR MEASURING ELECTRIC FIELD

摘要

PROBLEM TO BE SOLVED: To provide a method and an apparatus for measuring a high frequency magnetic field or electric field varying repeatedly at a high speed with a high spatial resolution. SOLUTION: An electron beam deflected by passing through a magnetic field or an electric field to be measured is passed through an electrostatic deflector and deflected, at a constant speed, in the direction perpendicular to the magnetic field or electric field being measured. Locus of the deflected electron beam is then detected by means of a two-dimensional detector to obtain a waveform or a figure where the time axis is orthogonal to the axis of a magnetic field under observation.