MAGNETIC FIELD MEASUREMENT METHOD AND MAGNETIC FIELD MEASUREMENT APPARATUS

摘要

In a magnetic field measurement apparatus, a light source irradiates a gas cell with linearly polarized light serving as pump light and probe light in a Z axis direction, and a magnetic field generator applies, to the gas cell, a magnetic field Ax which is a time function f(t) having the amplitude A0 taking n fixed values fi (where i=1, . . . , and n), and a magnetic field Ay which is a time function g(t) having the amplitude A0 taking m fixed values gj (where j=1, . . . , and m) in each of X axis and Y axis directions. A calculation controller calculates a magnetic field C (Cx, Cy, Cz) of a measurement region using the X axis and Y axis components Ax and Ay of an artificial magnetic field A, and a spin polarization degree Mx corresponding to a measurement value W− from a magnetic sensor.

主权项

1. A magnetic field measurement method of measuring a magnetic field of a measurement region in a magnetic field measurement apparatus where a first direction, a second direction, and a third direction are perpendicular to each other, the magnetic field measurement apparatus includes a light source that emits light, a medium through which the light passes in the third direction and that changes optical characteristics depending on a magnetic field of the measurement region, an photodetector that detects the optical characteristics, and a first magnetic field generator that generates a magnetic field in the first direction in the measurement region, the method comprising:
causing the first magnetic field generator to generate a first-constant magnetic field, a second-constant magnetic field, and a third-constant magnetic field, as the magnetic field in the first direction; and calculating the magnetic field of the measurement region using a detection result from the photodetector and the magnetic field in the first direction.