Abstract
Ultrasonic Lamb waves have been measured with a quantitative optical beam deflection (OBD) technique. Calibration of the technique is derived for two cases of laser probe beam cross-section, one with a uniform beam and the other with a Gaussian beam intensity distribution. Expressions for angular beam deflection angle are derived for both cases in terms of the total light intensity falling on the photodetector, assumed to have a square-law voltage response. Using a Gaussian beam intensity distribution from a HeNe laser, the OBD measurements were compared with those from a Michelson interferometer to show that measurements were self-consistent. © 1993.
| Original language | English |
|---|---|
| Pages (from-to) | 425-432 |
| Number of pages | 7 |
| Journal | Ultrasonics |
| Volume | 31 |
| Issue number | 6 |
| Publication status | Published - Nov 1993 |
Keywords
- Lamb waves
- optical beam deflection
- ultrasound detection