Magnetic modulator for magnetic field detection differentially outputting magnetic core noise

摘要

A magnetic modulator for detection of a very small magnetic field and current, comprising a rectangular or annular one-piece magnetic core divided into a plurality of core legs which are adapted to be provided with exciting inputs in opposite directions to each other and with signal inputs in parallel thereto, and detecting coils wound around each leg so as to function differentially with respect to the core noise and the exciting input and cumulatively with respect to the signal input, thereby adequately reducing the core noise and well improving the signal-noise ratio.