Title :
Wirelessly interrogable magnetic field sensor utilizing giant magneto-impedance effect and surface acoustic wave devices
Author :
Hauser, Hans ; Steindl, Reinhard ; Hausleitner, Christian ; Pohl, Alfred ; Nicolics, Johann
Author_Institution :
Inst. of Ind. Electron. & Mater. Sci., Tech. Univ. Wien, Austria
fDate :
6/1/2000 12:00:00 AM
Abstract :
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
Keywords :
amorphous magnetic materials; boron alloys; cobalt alloys; ferromagnetic materials; giant magnetoresistance; iron alloys; magnetic sensors; neodymium alloys; silicon alloys; surface acoustic wave sensors; transponders; 30 micron; Colpitts oscillator circuit; FeCoSiBNd; SAW transponders; amorphous wire; giant magnetoimpedance effect; high-temperature stability; low magnetic flux density; micro-magnetic field sensor; passive radio requestable sensor device; relative signal sensitivity; shape anisotropy; surface acoustic wave devices; wireless interrogable magnetic field sensor; zero magnetostriction; Acoustic sensors; Amorphous magnetic materials; Amorphous materials; Magnetic field measurement; Magnetic flux; Magnetic sensors; Magnetostriction; Surface acoustic wave devices; Surface acoustic waves; Wire;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
