Accession Number : ADD014205

Title :   Device for Inspection of Materials by Eddy Current Methods.

Descriptive Note : Patent Application, Filed 30 Jun 89,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Vernon, Susan N ; Lane, Stephen S

Report Date : 30 Jun 1989

Pagination or Media Count : 17

Abstract : With the growing application of filament-wound conductive fiber reinforced composites, particularly in aerospace, there is an increasing demand for nondestructive methods to detect and measure fiber anomalies such as service-incurred broken fibers and fabrication-related variations in fiber volume fraction or fiber density. Eddy current technology is ideally suited to these tasks since it is the conductive fibers which carry most of the current (carbon-carbons) or all of the current (graphite epoxies). Eddy current transducers may be used alone or in various combinations. A particular transducer may be both the transmitter and the receiver if the transducer is operating in the reflection mode. Patent applications. (JES)

Descriptors :   *NONDESTRUCTIVE TESTING, ANOMALIES, CONDUCTIVITY, DENSITY, EDDY CURRENTS, EPOXY COMPOUNDS, FIBERS, GRAPHITE, PATENT APPLICATIONS, REFLECTION, TRANSDUCERS

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE