The employment of amorphous Fe77.5Si7.5B15 wires in fluxgates

Dimitropoulos, PD; Avaritsiotis, JN

dc.contributor.author	Dimitropoulos, PD	en
dc.contributor.author	Avaritsiotis, JN	en
dc.date.accessioned	2014-03-01T01:52:12Z
dc.date.available	2014-03-01T01:52:12Z
dc.date.issued	2002	en
dc.identifier.issn	1454-4164	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/26597
dc.subject	magnetic sensors	en
dc.subject	magnetometers	en
dc.subject	fluxgate sensors	en
dc.subject	amorphous wires	en
dc.subject	Matteucci effect	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.classification	Optics	en
dc.subject.classification	Physics, Applied	en
dc.title	The employment of amorphous Fe77.5Si7.5B15 wires in fluxgates	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	The performance of two different kinds of fluxgate sensors that employ magnetic cores made of amorphous Fe77.5Si7.5B15 wires is presented in this work. In the first kind, the high axial anisotropy of the aforementioned wires is utilized for signal extraction. In the latter kind, the Matteucci effect observed in Fe77.5Si7.5B15 wires is employed, without the use of a secondary coil. It is well known that the sensitivity of second-order-harmonic fluxgate sensors is inversely proportional to the magnetic core cross-section. For this reason, amorphous wires, especially glass-covered ones, are being rarely used as magnetic cores in conventional fluxgate sensors. For compensating this disadvantage a novel signal extraction technique is employed, instead of the second-order-harmonic one, that makes sensor response independent from core cross-section, hysteresis loop shape and excitation frequency. For the noise performance of the fluxgate sensors to be optimized, the repeatability of axial B-z-H. and circumferential B -H-z hysteresis loops provided by 125 m, conventional and 40 in, glass-covered wires are quantitatively and qualitatively verified. Great attention is paid to the repeatability of B -H-z loops provided by wire-samples, excited with magnetic field waveforms of different frequency and amplitude and subjected to different torsion levels, or subjected to prior torsion-annealing. The Matteucci effect is well respected, because its employment offers the possibility for constructing miniature sensors. The influence of temperature increase in hysteresis loop repeatability is also investigated.	en
heal.publisher	NATL INST OPTOELECTRONICS	en
heal.journalName	JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS	en
dc.identifier.isi	ISI:000176427400015	en
dc.identifier.volume	4	en
dc.identifier.issue	2	en
dc.identifier.spage	281	en
dc.identifier.epage	284	en