Oblique Incidence of Coupling of Acoustic Energy. Phase 1. Acoustic Propagation through Air/Earth Interface
Abstract
The purpose of this program was to investigate the feasibility and develop techniques for air-coupling acoustic energy into and through the soil. Acoustics, as well as mechanical probes, thermal detectors, aerial photography, infrared scanners, gravimetric anomaly, microwave radiometry and sonic techniques, have been used previously in experiments to establish their characteristics for propagation through the soil. Possible application of acoustic propagation in soil includes usage in detection, surveillance, or communications. The reason for pursuing acoustics is that until now certain key modes of propagation have been overlooked eg., the shear wave, which has great penetration capability and can sensitively respond to ground stress anomalies. This program was to investigate acoustic energy propagation with an emphasis on shear wave propagation and air-coupling for obtaining practical mobility in any intended application. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1970
- Accession Number
- AD0716342
Entities
People
- Herbert S. Antman