Patent ID: 9360534
Filing Date: 2016-06-07
CPC Classification: G01R

Claim Text:
1. A magnetic field measuring apparatus comprising: a probe irradiation unit that irradiates a probe light having a straight polarization; a first reflection unit that reflects the probe light; a first cell that includes vapor of first alkali metal atoms therein; a second reflection unit that is different from the first reflection unit and that reflects the probe light; and a second cell that is different from the first cell and that includes vapor of second alkali metal atoms, wherein the probe light irradiation unit, the first cell, the second cell, and the second reflection unit are arranged in this order along with a probe light path so that the probe light irradiation unit and the second reflection unit are located at outer most positions along with the probe light path and the first and second cells are sandwiched by the first reflection unit and the second reflection unit with air gaps, a number of passage times of the probe light through the first and second cells are the same, a first reflection surface of the first reflection unit and a second reflection surface of the second reflection unit are parallel to each other, and the first reflection surface includes a plurality of passages for prove lights to pass through, such that the prove lights pass through the plurality of passages in either a direction toward the first reflection surface or in a direction away from the first reflection surface.