Characterisation of FBG based magnetic field sensor response sensitivity to excitation orientation for rotating electric machine applications

This paper reports an experimental study aimed at characterising the response of an in-situ fibre optic fibre Bragg grating / magnetostrictive flux sensor when exposed to excitation in orientations aligned with and perpendicular to its optimal performance axes. The study is aimed at improving the understanding of the potential for non-invasive in-situ application of this sensing technology in devices with confined geometries which impose restrictions on possible magnetic excitation axis alignment with that of the sensor, such as those encountered in rotating electric machinery.