Fibre optic system for the monitoring of asymmetric Lamb wave modulation in thin films

Fibre optic system for the monitoring of asymmetric Lamb wave modulation in thin films

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For monitoring temporal modulation of a laser-generated asymmetric (a0) Lamb wave, a non-contact fibre optic sensor has been used. Simultaneously, an electromagnetic acoustic transducer (EMAT) sensed in-plane acoustic transients of the symmetric (s0) Lamb wave. Measurements in 75 µm thick aluminium film show that a0 amplitude modulation is associated with a perturbation from the symmetric wave.


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