Dresden 2006 – scientific programme

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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.158: Poster

Tuesday, March 28, 2006, 15:15–19:15, P1

Fluxgate sensors with modulation frequencies up to 1 MHz — •Rainer Piel, Frank Ludwig, and Meinhard Schilling — TU-Braunschweig, Institut für elektrische Messtechnik und Grundlagen der Elektrotechnik, Hans-Sommer-Str. 66, D-38106 Braunschweig, Germany

Fluxgates measure magnetic vector fields in the DC and low frequency AC range. The measurement principle can be described as an amplitude modulation of measurement and excitation field. The arising signal is measured by a detection coil. Many applications, like nondestructive evaluation (NDE), compass, bioanalytics etc., require small sensors with high resolution. Smaller sensors, e.g., fabricated in thin-film or thick-film technology, however, limit the number of turns of the detection coil which in turn reduces their sensitivity and resolution. The increase of the modulation frequency offers a solution to this problem. Fluxgates are normally operated with modulation frequencies of some kHz. Furthermore, an increase of the modulation frequency up to 1 MHz allows one to achieve a higher measurement bandwidth which leads to an improvement in the dynamic behavior. The adjustment of sensor coils and electronics to these frequencies and the related difficulties are topic of this contribution. The measured sensor properties, such as sensitivity, noise and dynamics, are presented.