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Wirelessly interrogable magnetic field sensor utilizing giant magneto-impedance effect and surface acoustic wave devices

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5 Author(s)
Hauser, Hans ; Inst. of Ind. Electron. & Mater. Sci., Tech. Univ. Wien, Austria ; Steindl, R. ; Hausleitner, C. ; Pohl, A.
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A micro-magnetic field sensor is developed using the giant magneto-impedance (GMI) effect in a 30 μm diameter amorphous FeCoSiBNd wire of zero magnetostriction. Surface Acoustic Wave (SAW) devices are described as passive, radio requestable sensor devices. A new type employs the electrical load of the SAW device by the impedance of conventional sensors. In order to develop a wirelessly interrogable magnetic field sensor, the combination of GMI sensors and SAW transponders is discussed by several measurements. The device shows a relative signal sensitivity of 80 dB/T at low magnetic flux density B<30 mT, quick response (⩾40 MHz bandwidth), and a high-temperature stability

Published in:

Instrumentation and Measurement, IEEE Transactions on  (Volume:49 ,  Issue: 3 )

Date of Publication:

Jun 2000

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