| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical fiber magnetic sensor which has a simple construction and is excellent in extendability. SOLUTION: An FBG 13 covered with metal, a power source 15 for causing a current to flow in this metal covering 3, a light source 27 which causes light to enter the FBG, and a wavelength measuring instrument 29 for measuring the wavelength of light emitted from the FBG 13, are provided. A change of expansion or shrinkage of the FBG 13 is found from a detected wavelength of light emitted when a current is caused to flow in the metal covering 3, and information on external magnetic flux 17 is obtained from this change of expansion or shrinkage.
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