The use of electrostatic, ultrasonic, air-coupled transducers to generate and receive Lamb waves in anisotropic, viscoelastic plates

Electrostatic, air-coupled, ultrasonic transducers are used to generate and detect Lamb waves in viscoelastic, isotropic or anisotropic solid plates. The phase velocity and the attenuation of Lamb modes are measured and compared with numerical predictions. These results show that the air-coupled transducers can be used for NDT applications of materials.