2D Simulator for Eddy Current Field Filters

RECENT DEVELOPMENTS OF EDDY CURRENT INSPECfiON SIMULATOR

The purpose of such software development is threefold: First, the simulator serves as an analysis tool for NDE researchers to understand underlying physical processes on computers. Second, it provides a vehicle for software technology transfer to practicing NDE engineers and to component designers. Third, it can become an integral part in ( or the NDE module of) the unified life-cycle environme...

Eddy current

Eddy currents (also called Foucault currents[1]) are loops of electrical current induced within conductors by a changing magnetic field in the conductor, due to Faraday’s law of induction. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field. They can be induced within nearby stationary conductors by a time-varying magnetic field created by anAC el...

Quantification and compensation of eddy-current-induced magnetic-field gradients.

Two robust techniques for quantification and compensation of eddy-current-induced magnetic-field gradients and static magnetic-field shifts (ΔB0) in MRI systems are described. Purpose-built 1-D or six-point phantoms are employed. Both procedures involve measuring the effects of a prior magnetic-field-gradient test pulse on the phantom's free induction decay (FID). Phantom-specific analysis of t...

Localized eddy current compensation using quantitative field mapping.

Eddy current effects induced by switched gradients in proximal conducting structures are traditionally reduced by applying preemphasis currents whose amplitudes and decay characteristics must be set to offset the eddy current fields. We present an expeditious, localized, and quantitative method for mapping and adjusting the parameters for eddy current compensation. Mapping is based on analysis ...

Multigrid for Eddy Current Computation