A micro-fluxgate sensor based on the Matteucci effect of amorphous magnetic fibers

Dimitropoulos, PD; Avaritsiotis, JN

dc.contributor.author	Dimitropoulos, PD	en
dc.contributor.author	Avaritsiotis, JN	en
dc.date.accessioned	2014-03-01T01:16:01Z
dc.date.available	2014-03-01T01:16:01Z
dc.date.issued	2001	en
dc.identifier.issn	0924-4247	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13878
dc.subject	Fluxgate sensors	en
dc.subject	Magnetic anomaly detection	en
dc.subject	Magnetic sensors	en
dc.subject	Magnetometers	en
dc.subject	Matteucci effect	en
dc.subject	MEMs	en
dc.subject.classification	Engineering, Electrical & Electronic	en
dc.subject.classification	Instruments & Instrumentation	en
dc.subject.other	Amorphous materials	en
dc.subject.other	Annealing	en
dc.subject.other	Lithography	en
dc.subject.other	Magnetometers	en
dc.subject.other	Printed circuits	en
dc.subject.other	Resonators	en
dc.subject.other	Second harmonic generation	en
dc.subject.other	Signal processing	en
dc.subject.other	Signal to noise ratio	en
dc.subject.other	Stoichiometry	en
dc.subject.other	Microfluxgate sensors	en
dc.subject.other	Microsensors	en
dc.title	A micro-fluxgate sensor based on the Matteucci effect of amorphous magnetic fibers	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0924-4247(01)00706-3	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0924-4247(01)00706-3	en
heal.language	English	en
heal.publicationDate	2001	en
heal.abstract	The design, construction and performance of a novel micro-fluxgate sensor is presented in this work. The sensor is based on the large Matteucci effect that is observed in amorphous fibers of typical stoicheiometry Fe77.5Si7.5B15 after proper annealing. The sensor requires a single planar coil to function, which was constructed with conventional printed-circuit techniques along with the sensor signal conditioning circuitry. A new signal extraction technique was applied that is superior to the conventional second-order-harmonic concept, as far as sensitivity and signal-to-noise ratio are concerned. A conventional fiber, with diameter 125 mum, and a glass-covered fiber, with core diameter 20 mum and glass-cover thickness 20 mum, were used as magnetic cores in the fluxgate sensor. The amorphous fibers were mounted, subsequently, above a planar coil by soldering each two ends without any further mechanical treatment, like bending or twisting. Current annealing was performed before mounting, for both magnetic core types in order to optimize the inductive response of the fibers. The sensor sensitivity, before amplification, was measured to be 74000 V/T. The low magnetic noise observed allows for a relatively high overall precision, which in the case of glass-covered fiber has been verified to be 60 nT; this figure may easily improve by known signal conditioning techniques. The overall sensor head dimensions are 60 mm x 30 mm. Further scaling down may be achieved by means of advanced lithographic techniques in the case of glass-covered amorphous fibers only, which exhibit significant Matteucci effect in lengths down to 5 nim. (C) 2001 Elsevier Science B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE SA	en
heal.journalName	Sensors and Actuators, A: Physical	en
dc.identifier.doi	10.1016/S0924-4247(01)00706-3	en
dc.identifier.isi	ISI:000172065700006	en
dc.identifier.volume	94	en
dc.identifier.issue	3	en
dc.identifier.spage	165	en
dc.identifier.epage	176	en