A method of measuring the intensity distributions of radio-frequency electric and magnetic fields in resonant cavities
J.G. Linhart, T H B Baker · British Journal of Applied Physics · 1955
A method is described whereby the intensity distributions of the radio-frequency electric and magnetic fields in a resonant cavity may be determined in terms of the changes in both the resonant frequency and the Q -factor, caused by the placing of a small spherical bead of dielectric or ferromagnetic material at the relevant points in the cavity.