ULTRASONIC HOLOGRAPHIC IMAGING IN SOLIDS.
Abstract
The report describes a basic investigation of the ultrasonic holographic imaging of the interior of solids immersed in water. Ultrasonic holograms were recorded from coherently pulsed 5-megahertz ultrasonic radiation in a horizontal plane over the specimen by point-wise mapping in a TV-like raster with a modified X-Y recorder. The ultrasonic holograms are recorded as a photographic transparency. When suitably illuminated, the hologram produces a visible three-dimensional image. Necessary modifications were made to the system previously built to permit the imaging of the interior of solids instead of only the exterior. Several holograms and satisfactory holographic images of 1-mm-diameter holes in aluminum specimens were made and are reproduced here. A hole in cast iron could not be holographically imaged because of ultrasonic scatter by the cast iron. Basic properties of these holographic images and the techniques used to produce them are described. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1969
- Accession Number
- AD0695674
Entities
People
- Justin L. Kreuzer