A pendulum feedback system to measure the lateral force on a magnet placed above a high-Tc superconductor

Based on a simple mechanical pendulum design, we developed a sensor for measurement of the horizontal force on a permanent magnet placed at any distance above a high-{ital T}{sub {ital c}} superconductor. In this fully computerized system, which employs closed-loop feedback control, the lateral inte...

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Veröffentlicht in:	Review of scientific instruments 1990-12, Vol.61 (12), p.3827-3829
Hauptverfasser:	JOHANSEN, T. H, BRATSBERG, H, YANG, Z, HELGESEN, G, SKJELTORP, A. T
Format:	Artikel
Sprache:	eng
Schlagworte:	360104 - Metals & Alloys- Physical Properties ALKALINE EARTH METAL COMPOUNDS ALLOYS AMINES AMMONIUM COMPOUNDS BARIUM COMPOUNDS BARIUM OXIDES BORON ALLOYS CHALCOGENIDES COMPUTERIZED CONTROL SYSTEMS CONTROL SYSTEMS COPPER COMPOUNDS COPPER OXIDES DESIGN Exact sciences and technology HIGH-TC SUPERCONDUCTORS Instruments, apparatus, components and techniques common to several branches of physics and astronomy IRON ALLOYS LEVITATION Magnetic components, instruments and techniques MAGNETS MATERIALS SCIENCE MEASURING METHODS MEISSNER-OCHSENFELD EFFECT NEODYMIUM ALLOYS ORGANIC COMPOUNDS OXIDES OXYGEN COMPOUNDS PENDULUMS PERMANENT MAGNETS Physics QUATERNARY COMPOUNDS RARE EARTH ALLOYS SUPERCONDUCTORS TRANSITION ELEMENT COMPOUNDS USES YTTRIUM COMPOUNDS YTTRIUM OXIDES
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Beschreibung
Zusammenfassung:	Based on a simple mechanical pendulum design, we developed a sensor for measurement of the horizontal force on a permanent magnet placed at any distance above a high-{ital T}{sub {ital c}} superconductor. In this fully computerized system, which employs closed-loop feedback control, the lateral interaction with its restoring and hysteretic nature can be studied under conditions of constant vertical separation. Results are presented for the case of a small Nd-Fe-B magnet at a distance of 1 mm above a large planar disk of a YBa{sub 2}Cu{sub 3}O{sub {ital x}} superconductor.
ISSN:	0034-6748 1089-7623
DOI:	10.1063/1.1141508