Proceedings PaperCharacterization of nonlinear magnetostrictive dynamics by fiber optic interferometry
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A high strain resolution fiber optic interferometer is utilized to characterize the nonlinear magnetostrictive dynamics of amorphous ferromagnetic ribbons. Strain response of the magnetostrictive oscillator is found to exhibit several interesting routes to chaos as a function of applied dc and ac magnetic fields. In particular, we study parametric effects near a period doubling bifurcation. Small signal gain predicted near a super-critical period doubling bifurcation is verified in this system and has been used to demonstrate a fiber optic magnetic field sensor with gain. For appropriate parameter settings, the magnetostrictive oscillator also displayed a hysteretic sub-critical bifurcation. Stochastic resonance (SR) has been observed near such a sub-critical bifurcation. Suggestions are made regarding the exploitation of the SR effect for making novel magnetic field sensors.