The proposed research problem is to develop a sensor, together with a mathematical algorithm, that will allow the three-dimensional quantitative eddy-current nondestructive evaluation of materials and structures. the approach that we propose is based on, and extends, work on two-dimensional… More

The proposed research problem is to develop a sensor, together with a mathematical algorith, that will allow the three- dimensional quantitative eddy-current nondestructive evalution of materials and structures. the approach that we propose is based on, and extends work on two-dimensional… More

The proposed research problem is to develop a model and an inversion algorithm that is suitable for the three-dimensional quantitative non-destructive evaluation (nde) of advanced composite materials by using eddy-currents. the approach that we propose is based on, and extends, work that has already… More

There is a need to understand and predict the coupling of transient electromagnetic fields to metallic enclosures. this allows us to safeguard sensitive electronic equipment from the effects of large electromagnetic pulses, whose origins may be nuclear explosions pulsed microwaves or lightning. the… More

Previous research has shown that recursion equations provide an excellent computer hardware description language (chdl). currently this approach is not practical because it produces simulators that are too slow. we plan to develop a method for compiling iterative recursion equations into an… More

Computationally efficient inversion algorithms are needed in a variety of disciplines, such as medical imaging, nondestructive evaluation, geophysical prospecting, and robotic vision. the rigorous mathematical models of inversion that are associated with these problem areas are usually nonlinear,… More

There is a need to develop special purpose algorithms for solving electromagnetic coupling and scattering problems, that will take advantage of recent advances in computer technology. to that end we propose a novel algorithm that is based on solving nonlinear volume-integral equations in the… More

New types of anisotropic materails, such as composites, ceramics, and honeycomb structure, are finding increasingly important applications in high-frequency electromagnetics. these applications range from microwave and millimeter-wave integrated circuits and optical devices to antenna radomes and… More

A serious lack of efficient computer aided design (cad) procedures exists for high-performance monolithic millimeter wave integrated circuits, that operate between 30 and 100 ghz. this is due to the high-frequency behavior of the various (passive) components and high speed interconnectors of the… More

We propose to design an eddy-current probe testing station, built aronnd a PC running Interactive Systems Carp. UNIX (ISC UNIX). The testing station will provide a quantitative evaluation of eddy-current probe perform aJice ? thereby improving the accuracy and reha,bility of eddy-current inspection.… More

The ability to solve inverse problems lies at the heart of electromagnetic nondestructive evaluation (nde). these problems are difficult to solve for two reasons: they are mathematically illconditioned, and they are nonlinear, which means that they involve considerable computational effort, often… More

The use of eddy currents to detect surface-breaking defects is well established, and much knowledge has been built up in analyzing these signals. however, the theoretical basis for this technique is under-utilized or ignored. the electromagnetic equations to be solved are complex, as realistic… More