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Apr 2001

Volume 72, Issue 4, pp. 1937-2225

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back to top BASIC PHENOMENA

A double coil apparatus for Barkhausen noise measurements

E. Puppin, M. Zani, D. Vallaro, and A. Venturi

Rev. Sci. Instrum. 72, 2058 (2001); http://dx.doi.org/10.1063/1.1353193 (4 pages) | Cited 3 times

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A pickup coil wound around the sample is the standard method for Barkhausen noise (BN) measurements. Here we describe an apparatus where two coils are used instead of one. The relative position of the coils can be changed and this allows the experimental investigation of spatial correlation effects in BN. The signals induced in the coils are very similar when the coils are placed nearby whereas a progressive decrease of their correlation is observed by moving the coils apart. We tested our system on a ribbon of amorphous Fe63B14Si8Ni15 100 mm long. For a distance between the coils of 40 mm the signal correlation is nearly vanished. © 2001 American Institute of Physics.
Show PACS
07.55.-w Magnetic instruments and components
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
84.32.Hh Inductors and coils; wiring
75.50.Kj Amorphous and quasicrystalline magnetic materials
75.50.Bb Fe and its alloys
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