Output characteristics of wide-range and flexible magnetostrictive displacement sensor
The output voltage model for wide-range flexible magnetostrictive displacement sensor is established by using the magneto-mechanical coupling equation.The output voltage is theoretically calculated.The experimental platform is built.Output voltage are tested when the bias magnetic field and excitation current are in the range of 5～35 kA/m and 0.5～3.5 A,respectively.The theoretical value is compared with the measured value.The excitation current and bias magnetic field which make the output voltage of waveguide wire optimal are determined and compared the Fe46.5Ni48.5Cr2Ti2.5Al0.5 output characteristics under different state of elongation.The experimental results show that the optimal bias magnetic field and excitation current are (Fe83Ga17 )99.4 B0.6 at 15 kA/m and 1.5 A;Fe82Ga13.5Al4.5 at 20 kA/m and 1.5 A;Fe46.5Ni48.5Cr2Ti2.5Al0.5 at 10 kA/m and 2A,respectively.That Fe46.5Ni48.5Cr2Ti2.5Al0.5 waveguide wire signal attenuation degree is low,and the output voltage is consistent in different elongation states.The research can provide theoretical basis and guidance for design and develepment of wide-range flexible magnetostrictive displacement sensors.
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