TEA-CO2 laser generation of ultrasound in non-metals

Numerical and experimental studies of the generation of ultrasound by laser

“…Several approaches were proposed for modeling the therrnoelastic generation process 13-51 but very few took the optical penetration effect into account [6,7], studying the laser generation of ultrasound essentially on alurninum samples.…”

Detection of Laser Generated Lamb Waves in Non-Metals by Capacitance Transducers

“…Taylor et at. [18] using a pulsed CO 2-TEA laser generated ultrasound in non-metallic polymers and also reported the excitation" of symmetric and antisymmetric Lamb waves on a 1 mm thick non-metallic acetate sheet. Taylor [20] using the same CO, laser measured the thickness of non-metallic thin films.…”

“…He was able to measure the thickness of a 12 .urn stainless steel sheet with an accuracy of I'Yo. Houze et al [7) have used an ultrasonic pulse interferometer to measure the thickness of paint coatings in the range [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] .urn with a precision of 5°/". The remote generation of ultrasound, using pulsed lasers, has been the subject of considerable interest recently [8][9][10].…”

Laser Ultrasonic Thermoelastic/Ablation Generation with Laser Interferometric Detection in Graphite/Polymer Composites

“…[2] The relatively sparse literature on laser generation in other materials includes a paper by Taylor et ai., [3] describing experimental work on generation by a CO2 laser in pure polymer, and a paper by McKie and Addison, [4] comparing the effectiveness of Nd:YAG and CO2 lasers for generation in graphite/polymer composites. Taylor et al demonstrated that ultrasound waveforms at intermediate laser power levels can be interpreted as a superposition of waves generated by thermoelastic and ablation processes, with an additional component due to plasma breakdown at higher powers.…”