Real time imaging with shear waves and surface waves
Abstract
A chirp focused phased array B-scan imaging system has been employed to obtain cross sectional images in metals. Good quality images with a field of view of 5-20 cm x 5 cm of arrays of holes have been observed using shear waves, Rayleigh waves, Lamb waves, and flexural waves in thin sheets of metal. With 2.5 MHz Rayleigh waves, we have detected and located surface flaws as small as 250 microns deep and 1000 microns diameter.
- Publication:
-
7th International Symposium on Acoustical Holography and Imaging
- Pub Date:
- 1977
- Bibcode:
- 1977ahi..symp..103W
- Keywords:
-
- Lamb Waves;
- Metal Sheets;
- Rayleigh Waves;
- S Waves;
- Surface Acoustic Wave Devices;
- Surface Defects;
- Acoustic Delay Lines;
- Chirp Signals;
- Phased Arrays;
- Real Time Operation;
- Reflection;
- Refraction;
- Surface Waves;
- Instrumentation and Photography