Alternative transient eddy-current flowmetering methods for liquid metals

Immersed transient eddy current flow metering: a calibration-free velocity measurement technique for liquid metals

Eddy current flow meters (ECFM) are widely used for measuring the flow velocity of electrically conducting fluids. Since the flow induced perturbations of a magnetic field depend both on the geometry and the conductivity of the fluid, extensive calibration is needed to get accurate results. Transient eddy current flow metering (TECFM) has been developed to overcome this problem. It relies on tr...

Methods to pattern liquid metals

Transient eddy current simulation of a uni-planar gradient set

Introduction: Local gradients enable increased gradient strength and faster slew rates, which are both highly desirable to enable high-resolution and fast, real-time imaging(1). The planar gradient set presented in (2) illustrates one such gradient system, where all three gradient axes are incorporated into a uni-planar gradient set that is positioned within the magnet bore. Planar gradients pr...

Analysis of multilevel methods for eddy current problems

In papers by Arnold, Falk, and Winther, and by Hiptmair, novel multigrid methods for discrete H(curl; Ω)-elliptic boundary value problems have been proposed. Such problems frequently occur in computational electromagnetism, particularly in the context of eddy current simulation. This paper focuses on the analysis of those nodal multilevel decompositions of the spaces of edge finite elements tha...

Descriptions methods for 3D visualization of eddy current signatures

This article presents a comparison of methods for 3D evaluation of flaws during a manual eddy current (EC) inspection procedure. This paper introduce a robust EC signal processing method using non-linear filtration based on evaluation of the consecutive samples in the complex space. Data processing methods are based on Fourier transform and S-Transform. These methods are used for feature extrac...