Magnetic sensor using an optical pumping method
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United States of America Patent
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Apr 30, 2013
Grant Date -
Dec 30, 2010
app pub date -
Apr 14, 2010
filing date -
Jun 24, 2009
priority date (Note) -
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Abstract
A magnetic sensor that measures a magnetic field by using an optical pumping method, the magnetic sensor including: a cell that encloses therewithin atoms or ions each having a single electron in the outermost shell thereof and that is arranged inside the magnetic field; a light source that causes pulsed first linearly polarized light to be incident upon the cell; a circularly polarized light generator that converts a portion of second linearly polarized light, which is the first linearly polarized light having passed through the cell, into elliptically or circularly polarized light and causes the portion of second linearly polarized light to be incident upon the cell; and a polarimeter that detects an angle of rotation of a first polarization plane, which is polarization plane of the first linearly polarized light, and an angle of rotation of a second polarization plane, which is a polarization plane of the second linearly polarized light.
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