Regensburg 2004 – wissenschaftliches Programm

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MA: Magnetismus

MA 18: Magnetische Messmethoden

MA 18.3: Vortrag

Mittwoch, 10. März 2004, 18:00–18:15, H22

Digital method of magnetoresistive measurements based on Finite Impulse Response filters — •N. Kozlova, M. Kozlov, D. Eckert, K.-H. Müller, and L. Schultz — IFW Dresden, Postfach 270116, 01171 Dresden

A magnetoresistive technique has been developed for a pulsed field facility with fields up to 60 T. Four-probe AC measuring technique is used for magnetoresistance measurements. A digital approach for obtaining reliable signal-to-noise ratio results has been developed. Algorithms based on the least square method and the discrete Fourier transform were analyzed. The algorithm based on a Finite Impulse Response filter has been implemented. The Finite Impulse Response filter approach built around the zero-phase delay Parks-McClellan filter implementation shows a better signal to noise ratio in comparison with the least square method and the discrete Fourier transform algorithm. The filter parameter calculation and filtering has been solved in the Matlab Runtime integrated in VEE Pro 6.0. The digital approach was successfully tested with measurements on a superconducting bulk and thin film as well on semiconductor materials.

This work is supported by BMBF project 03 SC5 DRE.