Novel High Frequency Signatures for Classification/Identification
Abstract
The emphasis of the research summarized here concerns the production of enhancements in the scattering of high frequency sound by various penetrable cylinders. Examples of such cylinders in water include solid polymer (plastic) cylinders having flat or curved ends, plastic cylindrical shells containing a liquid having a low speed of sound, and a solid fiberglass cylinder. In some cases the cylinders were encased in stainless steel or fiberglass. In most cases studied the enhancements are associated with waves transmitted through the material within the cylinder and reflected off of the curved back wall of the cylinder. Various imaging methods are demonstrated including bistatic synthetic aperture sonar (SAS) and supersonic acoustic holography. The holographic and SAS images clearly indicate that contrary to an opinion held by some researchers, it is possible to have image features associated with waves transmitted within the objects being viewed which are much brighter than image features associated with external specular reflection or edge diffraction by the object. Some related research is described concerning the scattering by a partially exposed cylinder.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 2008
- Accession Number
- ADA483966
Entities
People
- Philip L Marston
Organizations
- Washington State University