Abstract
Directivity and generation efficiency of transverse and longitudinal bulk acoustic waves (BAWs) excited by phase velocity scanning (PVS) of laser interference fringes were theoretically investigated. Formulas were derived for the BAW generation based on scanning interference fringes (SIF) which were produced by intersecting two coherent laser beams with different frequencies on an opaque specimen. It was deduced that the amplitude of the BAW was proportional to the product of the scanning length of the SIF and the directivity pattern due to the thermoelastic line source. Unidirectionality of the BAW generated by the SIF was theoretically verified in an ideal state.
| Original language | English |
|---|---|
| Pages (from-to) | 2256-2261 |
| Number of pages | 6 |
| Journal | Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers |
| Volume | 41 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2002 Apr |
| Externally published | Yes |
Keywords
- Bulk acoustic waves
- Laser ultrasound
- Phase velocity scanning
- Scanning interference fringes
ASJC Scopus subject areas
- Engineering(all)
- Physics and Astronomy(all)