Accession Number:

AD0752509

Title:

Determining Presence, Thickness, and Electrical Properties of Stratified Media Using Swept-Frequency Radar

Descriptive Note:

Technical rept.

Corporate Author:

ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS

Personal Author(s):

• Lundien, Jerry R.

Report Date:

1972-11-01

Pagination or Media Count:

68.0

Abstract:

The ability of swept-frequency radar system operating under field conditions to detect the presence and measure the thickness of layered substrata and to determine the electrical properties of the materials in these substrata was studied. Reflectivity on sections of asphaltic concrete pavement structures i.e. asphalt highway of various subsurface layer thicknesses was measured by a specially designed microwave system operating over the frequency range of 0.25 to 8.0 GHz at perpendicular incidence. Test results indicated that swept-frequency radar measurements can be used to estimate power reflectance from the surface material of highway structures and to determine the amplitude of the subsurface contribution.

Descriptors:

• *NONDESTRUCTIVE TESTING
• *PAVEMENTS
• *ROADS
• THICKNESS
• POWER SPECTRA
• REFLECTIVITY
• INTEGRAL TRANSFORMS
• FOURIER ANALYSIS
• SURFACE PROPERTIES
• ELECTRICAL PROPERTIES
• MICROWAVES
• CONCRETE

Subject Categories:

• Civil Engineering
• Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE