Publication | Closed Access
New high-sensitivity hybrid magnetostrictive/electroactive magnetic field sensors
67
Citations
0
References
2003
Year
EngineeringMagnetic ResonanceMagnetic MaterialsMagnetic SensorMagnetismVibrationsPiezoelectric MaterialInstrumentationMagnetic SensorsElectrical EngineeringEnergy HarvestingMagnetic MeasurementPiezoelectric MaterialsPiezoelectricityCeramic Pzt-5Biomedical SensorsSensorsMagnetic DeviceTerfenol-d/pzt/ Terfenol-d Sandwich
A recently developed class of magnetic field sensors is based on the action of a magnetostrictive material on a piezoelectric material. Described here is a significant improvement on this class, a passive magnetic field sensor made of layers of Terfenol-D {Fe<sub>2</sub>(Dy<sub>0.7</sub>Tb<sub>0.3</sub>)} magnetostrictive material and ceramic PZT-5. These devices show a large magnetic field sensitivity of order 6 kV/T. Application of this device to harvesting vibration energy indicates that more than 10 mW of electrical power can be harvested using a Terfenol-D/PZT/ Terfenol-D sandwich (volume = 1 cm<sup>3</sup>) from 30 Hz vibrations having an acceleration of 0.5 g.