Accession Number:

ADD014572

Title:

Eddy Current Method to Measure Distance between Scanned Surface and a Subsurface Defect.

Descriptive Note:

Patent, Filed 9 Jan 89, patented 8 May 90,

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s):

• Vernon, Susan N.
• Gammell, Paul M.

Report Date:

1990-05-08

Pagination or Media Count:

10.0

Abstract:

This invention relates to a method for nondestructive inspection NDI of composite materials comprising conductive fibers. The depth of broken fiber damage in nonmetal matrix composites such as graphiteepoxy and carboncarbon materials may be ascertained and eddy current inspection is extended to include thick metal sections by this method. Inspection is possible with access limited to a single surface. Keywords Patents, PAT-CL-32A-237. jes

Descriptors:

• *COMPOSITE MATERIALS
• *SUBSURFACE
• CONDUCTIVITY
• DAMAGE
• EDDY CURRENTS
• FIBERS
• INSPECTION
• MATRIX MATERIALS
• MEASUREMENT
• METALS
• NONDESTRUCTIVE TESTING
• NONMETALS
• PATENTS
• RANGE(DISTANCE)
• SCANNING
• SURFACES
• THICKNESS

Subject Categories:

• Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE