Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1994-12-27
1996-02-27
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324690, G01R 2726
Patent
active
054951771
ABSTRACT:
Disclosed are a method and apparatus for real time process monitoring of thermoplastic filament winding. During processing, the thermoplastic filament winding is wound around an electrically conductive mandrel. An electrically conductive roller, juxtaposed and movable radially with respect to the mandrel, is provided for compression of the portion of the thermoplastic filament disposed on the mandrel. Accordingly, a dielectric capacitor is formed between the mandrel and the roller with the portion of the thermoplastic disposed between the mandrel and roller acting as the dielectric of the capacitor. An input voltage is applied to the dielectric capacitor, and the permittivity and loss factor of the capacitor are determined by monitoring the input voltage and output current to thereby determine the degree to which the thermoplastic has consolidated.
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Egerton, M. W. and Gruber, M. B., "Thermoplastic Filament Winding Demonstrating Economics and Properties Via In-Situ Consolidation", Proceedings of the 33rd International SAMPE Symposium, Mar. 1988, pp. 35-47.
Kranbuehl, D. E., Delos, S. E., Yi, E. C. and Mayer, J. T., "Dynamic Dielectric Analysis: A Nondestructive Cure Process Monitoring Method", Review of Progress in Quantitative Nondestructive Evaluation, vol. 5B, 1986, pp. 1030-1038. (month unavailable).
Liang Steven Y.
Urquhart-Foster Joseph A.
Georgia Tech Research Corporation
Tobin Christopher M.
Wieder Kenneth A.
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