Patent ID: 9274182
Filing Date: 2016-03-01
CPC Classification: G01R

Claim Text:
1. A magnetic field measurement apparatus comprising: a magnetic shield that is formed in an elongated hollow shape having openings at both sides thereof; a gas cell in which alkali metal gaseous atoms are sealed and that is disposed in a hollow area of the magnetic shield; an irradiation unit that irradiates irradiation light including linearly polarized light onto the alkali metal gaseous atoms sealed in the gas cell along a direction perpendicular to the axis of the magnetic shield, the alkali metal gaseous atoms being optically pumped to form a gaseous atom magnetic moment probability distribution that stretches along a magnetic field disturbance direction which is an axis direction of the magnetic shield, the lineally polarized light being adjusted so as to be a state in which a vibration direction of an electric field is parallel to the magnetic field disturbance direction; and a measurement unit that measures a rotational angle of a polarization plane of the irradiation light which is irradiated by the irradiation unit and passes through the alkali metal gaseous atoms.