Scattering of a broadband ultrasonic pulse by discontinuities
Abstract
In order to obtain quantitative information from ultrasonic waves scattered from hidden defects, a series of scattering experiments were carried out using broadband ultrasonics. The scattering amplitudes were measured as a function of frequency and scattering angle from various reflectors in water and from flat-bottomed holes in metals. A geometrical theory of diffraction was applied to obtain analytical expressions for scattering of both longitudinal and shear waves in cracklike flaws. The agreement between theoretical predictions and experimental results is good. Scattering experiments were also carried out from various shaped cavities embedded in diffusion-bonded titanium samples. The wave is mode converted and scattered as both shear and longitudinal waves. These two waves are time separated, gated out electronically, and the signal spectrum analysed separately. The resultant spectrum is a characteristic of the cavity shape.
- Publication:
-
IEEE Transactions on Sonics Ultrasonics
- Pub Date:
- September 1976
- Bibcode:
- 1976ITSU...23..351A
- Keywords:
-
- Acoustic Scattering;
- Amplitude Distribution Analysis;
- Cracking (Fracturing);
- Diffraction Patterns;
- S Waves;
- Ultrasonic Flaw Detection;
- Aluminum;
- Broadband;
- Longitudinal Waves;
- Oblate Spheroids;
- Performance Prediction;
- Titanium;
- Instrumentation and Photography