Abstract
Acoustic pulses have been generated in both metals and nonmetals using a low-energy tunable dye laser emitting 6-ns pulses with 20–210-μJ energies. The acoustic waveforms have been detected optically with a calibrated laser interferometer having improved signal-to-noise ratio. In this fashion, noncontact characterization of nonmetallic, as well as metallic samples of small size, has been shown to be feasible, using a potentially portable system. In addition between the relationship acoustic signal level and incident laser energy (and power density) has been measured for a polyimide-glass-fiber composite material.
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