| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve the following problem: when an optical probe current sensor which applies magnetic anisotropy in an in-plane direction of a magnetic substance with induction magnetic anisotropy or crystal magnetic anisotropy to obtain sensor sensitivity, is disposed inside a vehicle or in an environment at about 200°C, magnetic moment direction of the magnetic substance is changed, thereby changing sensor sensitivity.SOLUTION: An optical probe current sensor includes: a magnetic substance which is arranged near a conductor where a current to be measured flows, has shape magnetic anisotropy, and is configured so that a length of a part along an axis of easy magnetization is longer than a part along an axis of difficult magnetization; a light source which irradiates the magnetic substance with light; a magnetic field detection unit which detects a magnetic field applied to the magnetic substance, on the basis of polarization state of reflected light reflected by the magnetic substance; and a current calculation unit which calculates the current flowing in the conductor, on the basis of the magnetic field detected by the magnetic field detection unit.</p> |
