Current measurement technique and current measurement apparatus
AssigneeHitachi Global Storage Technologies Japan, Ltd.
InventorHiroshi Ikekame
Life of this patent
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Abstract
A current measurement method for measuring a current that flows in a transmission line of an electric circuit including steps of installing a magnetooptical device in a magnetic field which is generated based upon current that flows in the transmission line, making a polarized light on the magnetooptical device, and acquiring a current based upon the variation of the polarization of reflected light from the magnetooptical device on which the polarized light is incident.
Claims11
A current measurement method for measuring a current that flows in an electric current transmission line of an electric circuit, comprising the steps of:
- installing a magnetooptical device in a magnetic field which is generated based upon an electric current that flows in the electric current transmission line;
- making a polarized light incident on the magnetooptical device;
- and
- acquiring a current based upon the variation of the polarization of reflected light from the magnetooptical device on which the polarized light is incident.
A current measurement method for measuring a current that flows in a transmission line of an electric circuit provided with a first transmission line which is on an approach route of the flow of current and a second transmission line which is on a return route of the flow of the current, comprising the steps of:
- arranging a magnetooptical device in a magnetic field which is generated based upon current that flows in the first transmission line and in a magnetic field which is generated based upon current that flows in the second transmission line;
- making a polarized light incident on the magnetooptical device and between the first transmission line and the second transmission line;
- and
- acquiring a current based upon the variation of the polarization of reflected light from the magnetooptical device on which the polarized light is incident.
A current measurement method for measuring a current that flows in an electric current transmission line of an electric circuit, comprising the steps of:
- installing a magnetooptical device in a magnetic field which is generated based upon a low impedance current that flows in the electric current transmission line;
- making a polarized light incident on the magnetooptical device;
- and
- acquiring a current based upon the variation of the polarization of reflected light from the magnetooptical device on which the polarized light is incident.
Dependencies are inferred from the claim text.