Experimental modeling of laminar composites for multifrequency eddy current measurements. [Thickness and resistivity measurement on Al/Kapton or Al/polyimide]
This report describes a computer modeling program, originally developed by Dodd and Deeds of Oak Ridge National Laboratory, capable of calculating the experimental voltage amplitudes and phases which can be obtained with rectangular cross-section coils being operated at multiple frequencies. This program was applied to two multilayered composites in order to determine the feasibility of making thickness and resistivity measurements of the individual layers. The results of these calculations indicate that the thickness of the aluminum/Kapton composite layers could be measured to a precision of better than 1% and the resistivity of the conductive layers could be measured to a precision of better than 10%. The second composite, a structure consisting of alternating layers of aluminum and polyimide, a varnish, was found to be measureable also. A minimum of two frequency components were found to be necessary for the aluminum/Kapton composite while three frequencies were found to be necessary for the aluminum polyimide case.
- Research Organization:
- Bendix Corp., Kansas City, MO (United States)
- DOE Contract Number:
- AC04-76DP00613
- OSTI ID:
- 5065219
- Report Number(s):
- BDX-613-2482
- Resource Relation:
- Other Information: Portions of document are illegible
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
COMPOSITE MATERIALS
EDDY CURRENT TESTING
ALUMINIUM
ELECTRIC CONDUCTIVITY
LAYERS
MEASURING METHODS
PLASTICS
THICKNESS
DIMENSIONS
ELECTRICAL PROPERTIES
ELECTROMAGNETIC TESTING
ELEMENTS
MATERIALS
MATERIALS TESTING
METALS
NONDESTRUCTIVE TESTING
PETROCHEMICALS
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
TESTING
420500* - Engineering- Materials Testing
360302 - Composite Materials- Structure & Phase Studies- (-1987)