Abstract
Experimentally and numerically, measurements have been presented for new type of magnetic field sensor based on combining multimode optical fiber and magnetic ferrofluid. The ferrofluid was filled in a capillary tube around a 15 mm uncladded region of optical fiber. Three uncladded geometries cylindrical, D-shaped and 2D-shaped, have been investigated to study the effect of geometry on sensing performance. Results illustrate that the geometry of the optical fiber has a significant impact on the evanescent waves which propagate from the sensing region into the ferrofluid tube. The obtained results expressed that among all studied cases, the D-shaped configuration has the best performance designing an optical fiber-based magnetic field sensor, since the best measured sensor features such as linearity, sensitivity, response time and recovery time for this case are R2 = 0.9865, 0.01795 μW/mT, 3.15 s and 0.26 s, respectively.
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