Title :
A magnetostrictive sensor interrogated by fiber gratings for DC-current and temperature discrimination
Author :
Mora, J. ; Díez, A. ; Cruz, J.L. ; Andrés, M.V.
Author_Institution :
Dept. de Fisica Aplicada, Valencia Univ., Spain
Abstract :
A magnetostrictive sensor head with temperature compensation has been developed for measurement of static magnetic fields. The device consists on two different alloys with similar thermal expansion coefficient one of which has a giant magnetostriction, the expansion of both materials produced by heat and magnetism is detected by two fiber gratings. One of the gratings measures the temperature of the sensor and the difference between the wavelengths reflected by the gratings is a measurement of the magnetically induced strain.
Keywords :
diffraction gratings; electric current measurement; fibre optic sensors; magnetic field measurement; magnetic sensors; magnetostrictive devices; temperature measurement; thermal expansion; DC-current discrimination; alloys; fiber gratings; giant magnetostriction; magnetically induced strain; magnetostrictive sensor; magnetostrictive sensor head; static magnetic fields; temperature compensation; temperature discrimination; thermal expansion coefficient; Fiber gratings; Magnetic field measurement; Magnetic materials; Magnetic sensors; Magnetostriction; Optical fiber devices; Optical fiber sensors; Strain measurement; Temperature measurement; Temperature sensors;
Journal_Title :
Photonics Technology Letters, IEEE
