Measuring and testing – Vibration – Resonance – frequency – or amplitude study
Patent
1997-02-28
1999-06-08
Williams, Hezron
Measuring and testing
Vibration
Resonance, frequency, or amplitude study
73659, 702 39, 702 35, 310336, 310328, G01H 1108, G01N 2912
Patent
active
059111585
ABSTRACT:
An apparatus and method for determining the dynamic response of a physical structure is disclosed. A single sheet of a piezoelectric polymer film, preferably polyvinylidene fluoride, or PVDF, is coated on one side with a thin layer of conductive material to serve as a ground electrode. The other side of the sheet is coated with a thin layer or conductive material in a non-contiguous pattern of individual electrodes defining an array of discrete piezoelectric transducers. Sensor leads are connected to each individual electrode and lead to a signal processor which includes associated software for determining from the processed electrical signals relative strain amplitudes of the surface area of a physical structure onto which the sheet is attached. The resulting output can be used to record strain time histories for later processing or, more simply, to show the time-averaged, steady state strain response of a structure.
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Agnes Gregory S.
Gordon Robert W.
Henderson Douglas A.
Hollkamp Joseph W.
Kundert Thomas L.
Miller Rose M.
Sinder Fredric L.
The United States of America as represented by the Secretary of
Williams Hezron
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