Abstract
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 So mode dominated by in-plane motion in the low fd (frequency times thickness) regime is obtained with the IPDI.
Original language | English |
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Pages (from-to) | 91-94 |
Number of pages | 4 |
Journal | Key Engineering Materials |
Volume | 321-323 I |
DOIs | |
State | Published - 2006 |
Keywords
- In-plane motion
- Indentation
- Lamb wave
- Laser ultrasound