Magnetic actuator based on giant magnetostrictive material Terfenol-D with strain and temperature monitoring using FBG optical sensor

We have designed a temperature and strain monitoring system for a magnetic actuator based on the giant magnetostrictive material Terfenol-D (Tb0.3 Dy0.7Fe1.92) with Fiber Bragg grating (FBG) sensors. Magneto-elastic properties of Terfenol-D depend on magnetization, stress pre-history, and temperatur...

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Bibliographic Details
Published in:Measurement : journal of the International Measurement Confederation 2016-02, Vol.80, p.201-206
Main Authors: García-Miquel, H., Barrera, D., Amat, R., Kurlyandskaya, G.V., Sales, S.
Format: Article
Language:English
Subjects:
Fiber Bragg grating
Fiber optic
Magnetic optic actuator
Magneto optic sensors
Magnetostriction
Terfenol-D
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Summary:We have designed a temperature and strain monitoring system for a magnetic actuator based on the giant magnetostrictive material Terfenol-D (Tb0.3 Dy0.7Fe1.92) with Fiber Bragg grating (FBG) sensors. Magneto-elastic properties of Terfenol-D depend on magnetization, stress pre-history, and temperature. In order to simultaneously monitor these effects, we have implemented a system based on a cylindrical Terfenol-D rod monitored with four FBGs that allows making the appropriate compensations on the strain measurement due to temperature drift. We have measured the magnetostriction in the axial and the transverse directions for the Terfenol-D rod with two perpendicular FBGs, and calculated the Poisson ratio. An additional mechanical system for strain amplification has been designed in order to increase sensitivity, by a factor of 4, in the strain measurement with the FBG sensor.
ISSN:0263-2241
1873-412X
DOI:10.1016/j.measurement.2015.11.035