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Broadband laser ultrasonics and two dimensional Fourier transformation areused to characterize the properties of varieties of foils and plates. Laserultrasonics generation is achieved by use of a pulsed laser which depositspulsed laser energy on the surface of the specimen. The displacement amplitudeof the resulting broadband ultrasonic modes are monitored using a two wavemixing photo-refractive interferometer. By applying a two dimensional Fouriertransformation to the detected spatial and temporal displacement waveforms, theimages of density of state (DOS) for the excited ultrasounds are obtained.Results are presented for a 150 um thick paper sample, a 52.8 um stainlesssteel foil and a 1.27 mm thick aluminum plate. The DOS image demonstrates theability to measure the properties of each generated ultrasonic modes andprovides a direct, non destructive, measure of elastic moduli of the testedspecimensComment: Laser ultrasonics, Fourier transformation, NDT&E, Lamb waves, plate  mode

Noncontact determination of elastic moduli by two-dimensional Fourier transformation and laser ultrasonic technique