Abstract
One of the factors limiting the application of laser-based ultrasonics for nondestructive evaluation is the relatively low efficiency of ultrasound generation by laser illumination. The present paper describes a method for improved narrowband surface wave generation by the use of a line focused laser and an array technique. A tone-bursl-like surface wave has been generated by a diffraction grating and a lens system. The system provides controllable center frequency by adjustment of the width and spacing of the lines of laser illumination in the array, li has been demonstrated by the use of laser interferometer detection that the signalto-noise ratio is significantly improved.
| Original language | English (US) |
|---|---|
| Article number | 234221 |
| Pages (from-to) | 537-541 |
| Number of pages | 5 |
| Journal | Proceedings - IEEE Ultrasonics Symposium |
| DOIs | |
| State | Published - 1991 |
| Event | 1991 IEEE Ultrasonics Symposium. ULTSYM 1991 - Orlando, United States Duration: Dec 8 1991 → Dec 11 1991 |
Funding
This work was carried out in the course of research sponsored by the FAA Center for Aviation Systems Reliability, operated by Ames Laboratory, USDOE, for the Federal Aviation Administration under Contract No. W-7405-ENG-82 for work by Iowa State University and Northwestern University.
ASJC Scopus subject areas
- Acoustics and Ultrasonics