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

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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.

Inspec keywords: photoacoustic effect; amplitude modulation; surface acoustic waves; metallic thin films; surface acoustic wave transducers; surface acoustic wave waveguides; aluminium; ultrasonic measurement; fibre optic sensors

Other keywords: electromagnetic acoustic transducer; noncontact fibre optic sensor; in-plane acoustic transients; asymmetric Lamb wave modulation; amplitude modulation; 75 micron; symmetric wave perturbation; temporal modulation; Al

Subjects: Acoustic wave devices; Ultrasonics, quantum acoustics, and physical effects of sound; Fibre optic sensors; Transduction; devices for the generation and reproduction of sound; Fibre optic sensors; fibre gyros; Photoacoustics; Mechanical and acoustical properties of solid surfaces and interfaces; Measurement of acoustic variables; Other nonelectric variables measurement; Sonic and ultrasonic transducers and sensors

References

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      • B.A. Williams , R.J. Dewhurst . Differential fibre-optic sensing oflaser-generated ultrasound. Electron. Lett. , 391 - 392
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      • R.J. Dewhurst , C. Edwards , A.D.W. McKie , S.B. Palmer . Estimation of thethickness of thin metal sheet using laser-generated ultrasound. Appl. Phys. Lett. , 1066 - 1068
    3. 3)
      • S.E. Bobbin , J.W. Wagner , R.C. Cammarata . Interpretation of laser-generatedlow order Lamb waves for elastic modulus measurements in thin films. Ultrasonics , 87 - 90
    4. 4)
      • J.B. Spicer , A.D.W. McKie , J.W. Wagner . Quantitative theory for laserultrasonic waves in thin plates. Appl. Phys. Lett. , 1882 - 1884
    5. 5)
      • L. Noui , R.J. Dewhurst . A laser-beam deflection technique for the quantitativedetection of ultrasonic Lamb waves. Ultrasonics , 425 - 432
    6. 6)
      • Spicer, J.B.: 1991, Ph.D, Johns Hopkins University, MD, USA.
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