Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1990-06-13
1992-08-18
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
427 8, 324674, G01R 2726
Patent
active
051402742
ABSTRACT:
An apparatus and method for non-destructively measuring the thickness of an internal coating in a container and when the internal coating is defective the area of exposed metal. The apparatus uses a frequency source which is capable of generating two sinusoidal signals of predetermined frequency and of constant amplitude wherein the two sinusoidal signals are ninety degrees apart in phase. One of the two signals is applied across a predetermined area at a selected interior configuration in the container. The applied signal has its phase and amplitude varied as a function of the thickness of the internal coating and as a function of exposed surface metal from defects in the coating. Applied signal as varied is converted to a voltage in a current-to-voltage amplifier and delivered into an electronic circuit which combines it with the second signal from the frequency source in order to produce a capacitive output indicative of the thickness of the internal coating being measured in the predetermined area. The applied signal as varied is also combined with the first signal in order to produce a resistive output indicative of the area of exposed metal. A plurality of sensing probes are placed in a container to obtain thickness and exposed metal area measurements at different predetermined areas of the container, thereby obtaining a profile of the interior coating of the container.
REFERENCES:
patent: 2557798 (1951-06-01), Reitz, Jr.
patent: 4791354 (1988-12-01), Wardell
patent: 4806849 (1989-02-01), Kihira et al.
patent: 4968946 (1990-11-01), Maier
patent: 4968947 (1990-11-01), Thorn
"Strandgauge Operating Instructions" by Strand-Electronics, Ltd., Jun. 1983.
Horacek Stephen M.
Minet H. Kent
Wertz Ronald D.
Ball Corporation
Regan Maura K.
Wieder Kenneth A.
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