This paper describes the design of a measuring chain for polyharmonic metal detectors used for education in laboratory exercises at Czech Technical University in Prague, Faculty of Electrical Engineering, Department of Measurement. The Measuring chain is composed of DDS signal generator, Digitiser and PC with software programmed in Labview. Eddy current principles or more specifically eddy curr...

during the past .. years, non-invasive .rain stimulation has .ecome an emerging .eld in clinical neuroscience due to its capability to transiently modulate corticospinal excitability, motor and cognitive functions. .hereas transcranial magnetic stimulation has .een used e.tensively since more than t.o decades ago as a potential .neuromodulator., transcranial current stimulation .tcs. has more r...

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 ...

INTRODUCTION Electroconvulsive therapy (ECT), in which electric currents are applied to the brain, improves severe mental illnesses such as depression [1]. Transcranial magnetic stimulation (TMS) is a method to stimulate neurons using eddy currents generated by pulsed magnetic fields [2,3]. Because TMS has a potential to give a comparable therapeutic effect to ECT with less invasiveness, TMS ha...

Control by eddy current is one of techniques that’s very used in nondestructive evaluation of materials. These processes find an application significant in the determination of the mechanical and metallurgical parameters of materials. The object of this work is to carry out an analysis of the residual stresses in the material created by external solicitations and analysed by eddy currents as a ...

Nanostructured hematite thin films are doped with zirconium successfully and also modified by introducing CNT using sol-gel method for their implementation as photo-electrode in photo-electrochemical (PEC) cell for hydrogen generation. XRD, UV-visible spectroscopy and PEC study techniques are used to characterize the thin films. The PEC responses of thin films are improved by introducing carbon...

Two nondestructive electromagnetic/magnetic techniques including hysteresis loop and eddy current methodologies have been used to characterize microstructural changes of AISI D2 cold work tool steel as a result of quench and tempering treatments. To measure the fraction retained austenite in quenched microstructure, six specimens were austenitized in the range  of 1000-1130 °C. Samples austenit...

A wet etch process that produces smooth sidewalls aligned with the m-plane ({1!100}) crystal facets of Ga-polar GaN grown on sapphire is demonstrated by combining photo-electrochemical (PEC) treatment with a postprocessing wet etch step. This novel process results in faceted and extremely smooth vertical etched sidewalls. This two-step process consists of a PEC treatment to define the geometry ...