Programmable magnetometer channel

Abstract

Event Abstract Back to Event Programmable magnetometer channel Robert Gäde1*, René Schüler1, Tino Gablenz1 and Lutz Herrmann2 1 BioMed Jena, Germany 2 University of Applied Science Jena, Department of Medical Engineering, Germany Often, a high DC component causes difficulties in the aquisi-tion of variable magnetic fields. For example, the geomagnetic field is a direct signal by orders of magnitude higher than the measurement signal to be analyzed. Usually, in this problem situation an AC coupling is used in the measurement channel. The damping of the DC component using analog filters or arithmetic circuits often proves to be an inadequate solution, because a technically feasible, therefore finite damping by appropriate signal gain can be reduced or canceled. However, the damping of the same portion with the help of analogous filter circuits or arithmetic circuits often turns out insufficient solution, because a technically realizable, limited damping can be reduced by suitable signal gain or be lifted. The used high-pass filter with its finite edge steepness may damp time-variable signal components and produce a filter ringing as a function of the signal. A high-pass filter coupling also allows no statement about the DC component in the measurement signal. The idea of the method described is to reduce only the DC component of the measurement signal by direct influence on the signal mean value. The system developed for this purpose owns in addition to programmable filter and amplifier devices a suitable arrangement of two high-resolution programmable voltage sources as well as a appropriate control device. Due to the arrangement of the voltage sources it is possible to very finely correct the DC component before and after the amplifier stage. The correction procedure can take place manually, assisted or automatically. The results show that the utilizable portion of the measurement signal, using this method can be optimally mapped to a subsequent signal acquisition, which increases the dynamic and the resolution of the entire measuring system. In addition, the damping of the time-variable signal components is avoided. Conference: Biomag 2010 - 17th International Conference on Biomagnetism , Dubrovnik, Croatia, 28 Mar - 1 Apr, 2010. Presentation Type: Poster Presentation Topic: Signal proccessing Citation: Gäde R, Schüler R, Gablenz T and Herrmann L (2010). Programmable magnetometer channel. Front. Neurosci. Conference Abstract: Biomag 2010 - 17th International Conference on Biomagnetism . doi: 10.3389/conf.fnins.2010.06.00104 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 23 Mar 2010; Published Online: 23 Mar 2010. * Correspondence: Robert Gäde, BioMed Jena, Jena, Germany, gaede@biomed-jena.de Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Robert Gäde René Schüler Tino Gablenz Lutz Herrmann Google Robert Gäde René Schüler Tino Gablenz Lutz Herrmann Google Scholar Robert Gäde René Schüler Tino Gablenz Lutz Herrmann PubMed Robert Gäde René Schüler Tino Gablenz Lutz Herrmann Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.