Line source representation for laser-generated ultrasound in aluminum

作者：Johanna R. Bernstein, James B. Spicer · 发表于：The Journal of the Acoustical Society of America · 年份：2000 · DOI：10.1121/1.428422 · 被引用次数：91 · 研究领域：Ultrasonics and Acoustic Wave Propagation、Thermography and Photoacoustic Techniques、Non-Destructive Testing Techniques

Modeling the ultrasound generated by a laser source is critical for using noncontact laser-generated ultrasonic systems for the characterization of material properties. In this work, a laser line source was modeled and verified experimentally by measuring the ultrasonic shear wave signal generated in aluminum with a broadband laser generation/electromagnetic acoustic transducer (EMAT)-detection system. Results of calculations and experiments show that the amplitude directivity of a laser line source is identical to that of a point source in the plane perpendicular to the line axis while the temporal dependence differs.