AC current I = Io cos(ωt) is fed to the drive coil output signal - Volts detection coil Metglas drive coil I.

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Presentation transcript:

AC current I = Io cos(ωt) is fed to the drive coil output signal - Volts detection coil Metglas drive coil I

AC magnetic field B = Bo cos(ωt) is produced output signal - Volts detection coil Metglas drive coil B

The magnetic field forces the magnetoelastic material to vibrate. detection coil drive coil vibrationsMetglas

The vibrations result in an alternating magnetization M = Mo cos(ωt) … detection coil drive coil MMetglas

… which causes time-changing magnetic flux through the detection coil... detection coil drive coil MMetglas flux

… which induces a signal voltage V = Vo cos(ωt) to the output detection coil Metglas drive coil V

Vo versus ω shows a maximum at the material’s natural frequency ω 0 ω Vo ω0ω0

ω 0 depends among other factors on the mass load on the material ω Vo ab a b