C. Floridia, A.C.S. Brgida, F. Borin, D.C. Dini, P. Alcantara Jr., and N. Bramatti (Brazil)
Proximity sensor, Gratings, Optical fiber applications, Optical fiber
We propose a novel temperature-independent proximity optical sensor. The idea consists in the use of a magnet attached to a Fiber Bragg Grating (FBG). Deformation on the FBG depends on the proximity of the magnet to a metallic target. This deformation results in variation of the period of the grating and on the reflected wavelength from a wide-band source as a LED. The wavelength displacement can be easily converted to optical power variations using a second FBG which also compensates the environment temperature. As a result we have obtained a low cost device due to the simplified technique of interrogation.
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