Magnetic field sensor having magneto-optic element.

摘要

A magnetic field sensor is described which comprises a light source part (11), a magnetic field detection part which contains a magneto-optic element (13) and a light measurement part (15) which measures the light that has been radiated from the light source part (11) and has passed through the magnetic field detection part (15), and is characterised in that the magneto-optic element (13) is arranged such that its easy axis of magnetization is substantially at right angles to the direction of the magnetic field to be measured (16). The sensor can measure a wide range of magnetic fields with a high degree of accuracy and high sensitivity.