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

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

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

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

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

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

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

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