Standard flaws for eddy current probe characterization
نویسندگان
چکیده
منابع مشابه
Standard Flaws for Eddy Current Probe
Calibration procedures for eddy current inspections often involve the use of artifact standards containing manufactured flaws. The manufactured flaw is assumed to be a good approximation of the type of flaw being sought during the inspection. These manufactured flaws are most often produced by electrical dis charge machining (EDM) , milling, or the controlled growth of fatigue cracks. With simp...
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National Bureau of Standards Boulder, CO 80303 In a new approach to eddy current detection and sizing of surface-breaking flaws, we have coupled a conventional reflection probe to a superconducting quantum interference device (SQUID) to produce an eddy current probe with increased sensitivity and signal to noise ratio. The reflection probe consists of an air-core excitation coil surrounding two...
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Nondestructive inspections involving multi-layered structures often require a reliable NDI methodology to estimate size and location of a flaw with quantitative information about width and depth. Compared to conventional wire-wound pick-up coil based eddy current NDI methods, Giant Magneto-resistive (GMR) sensor based eddy current methods have shown a much better sensitivity (20–50 times) for a...
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We study different strategies for the truncation of computational domains in the simulation of eddy current probes of elongated axisymmetric tubes. For axial fictitious boundaries, an exact Dirichlet-to-Neumann (DtN) map is proposed and mathematically justified via the analysis of a nonselfadjoint spectral problem. We rely of results from the spectral theory of compact perturbations of selfadjo...
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The first prototype wireless eddy current (EC) probe for on-wing inspection was demonstrated in a F100 PW-220 engine without external cabling at the Air National Guard overhaul facility in Des Moines Iowa. Wireless NDE probes have potential safety and economic benefits leading to prevention or mitigation of safety significant propulsion system malfunctions. Data from 2 MHz Eddy Current probes w...
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ژورنال
عنوان ژورنال: NDT International
سال: 1990
ISSN: 0308-9126
DOI: 10.1016/0308-9126(90)90876-p