Application of shear wave focused image holography to nondestructive testing
Abstract
A method for sizing vertical and oblique flaws in metal structures by scanned acoustical holographic interferometry in the shear wave focused image hologram mode is proposed. The method employs a simultaneous source-receiver scanning technique with a pulse-echo mode focused transducer. Relations between the flaw size and the number and separation of the fringes on the hologram are derived. The sizes of artificial flaws in steel plates were determined by an experimental scanning type acoustical holography system by means of the theoretical relations obtained. Deviations of flaw heights obtained in this manner from the true ones were 10% for 4.0 mm height flaws at 3.0 MHz and 5% at 5.6 MHz.
- Publication:
-
7th International Symposium on Acoustical Holography and Imaging
- Pub Date:
- 1977
- Bibcode:
- 1977ahi..symp..583S
- Keywords:
-
- Acoustical Holography;
- Diffraction Patterns;
- Nondestructive Tests;
- S Waves;
- Electron Beam Welding;
- Focusing;
- Steel Structures;
- Welded Joints;
- Instrumentation and Photography