Magnetic field measurement apparatus

Patent metadata

Field	Value
Publication number	US-9500722-B2
Application number	US-201514606668-A
Country	US
Kind code	B2
Filing date	Jan 27, 2015
Priority date	Jan 31, 2014
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

Gas cells allow first detection light and second detection light to pass therethrough and rotate the polarization plane of linearly polarized light in accordance with a magnetic field. A first detection section and a second detection section detect the polarization planes of the linearly polarized light that has passed through the gas cells. A third detection section and a fourth detection section detect the polarization planes of the linearly polarized light that has not passed through the gas cells. A measurement section uses detection results from the first detection section and the third detection section to remove influence of optical noise contained in the first detection light, uses detection results from the second detection section and the fourth detection section to remove influence of optical noise contained in the second detection light, and measures the difference in the magnetic field between the gas cells.

First claim

What is claimed is:

1. A magnetic field measurement apparatus comprising:
a first medium formed of a plurality of first media, the first medium allowing light from a first light source to pass therethrough and rotates a first polarization plane of linearly polarized light in accordance with an intensity of a magnetic field;
a second medium that allows light from a second light source to pass therethrough and rotates a second polarization plane of linearly polarized light in acco…

Assignees

• Seiko Epson Corp

Inventors

• Takahashi Satoshi

Classifications

• G01R33/032 Primary

  Physics · mapped topic