8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique
J. Phys. IV France 04 (1994) C7-729-C7-732
Noncontact characterization of adhesion of surface layers by laser-generated acoustic wavesP. Weiss and M.W. Sigrist
ETH Zurich, Institute of Quantum Electronics, 8093 Zurich, Switzerland
Laser-induced spallation is proposed as a powerful means for the investigation of adhesion properties of solid surface films. Ultrasonic pulses are produced at the back side of the sample by the impact of Nd :YAG-laser pulses. At the front side, the induced ultrasonic surface displacements are monitored with a 300 MHz bandwidth fiber-optic interferometer, which is proposed as a versatile point-detection ultrasonic transducer. The technique is applied to the time-resolved monitoring of laser-induced spallation and debonding of surface films.
© EDP Sciences 1994