Focusing probes for ultrasonic flaw detection
Abstract
The basic principles of ultrasonic focusing for ultrasonic flaw detection and current computation methods for ultrasonic focusing systems in particular engineering applications are discussed. Focusing systems, including active concentrators, refractors, reflectors and deflectors are introduced and the spherical convergent wave fronts produced by the systems are characterized in terms of pressure distribution and geometric and acoustic focal parameters. Distortions to the ideal focal region due to the distortions encountered in actual wave fronts are considered, and the design of a probe with specified focal parameters in which the refraction of a converging front at the interface of the two media is treated by the construction of a virtual focus is presented. Examples of the effectiveness of focusing probes for flaw inspection are noted, pointing out the use of focusing probes to improve flaw detection by focusing sensitivity and resolution at a given depth or by improving the signal-to-noise ratio and equalizing sensitivity at various depths.
- Publication:
-
Soviet Journal of Nondestructive Testing
- Pub Date:
- October 1979
- Bibcode:
- 1979SvJNT..15..139E