An Optical Method for the Detection of In-Plane Motion of Acoustic Waves Propagating in Solids
A new interference-based optical technique called in-plane displacement interferometer (IPDI) is introduced for the detection of in-plane (IP) motion of ultrasonic waves. The IPDI employs a tiny square indentation of about 30 microns in width on the sample surface and a relatively simple optical arrangement for the detection of IP motion of ultrasonics waves. With the IPDI, measurement of IP motions of Lamb waves propagating along a thin brass foil is demonstrated. Dispersion relations for the S0 mode dominated by in-plane motion in the low fd (frequency times thickness) regime is obtained with the IPDI.
Seung-Seok Lee, Joon Hyun Lee, Ik Keun Park, Sung-Jin Song, Man Yong Choi
C. H. Yang, Y. C. Tsai, "An Optical Method for the Detection of In-Plane Motion of Acoustic Waves Propagating in Solids", Key Engineering Materials, Vols. 321-323, pp. 91-94, 2006