Improved eddy-current decay method for resistivity characterization

Author

Kos, A.B. ; Fickett, F.R.

Author_Institution

Div. of Electromagn. Technol., Nat. Inst. of Stand. & Technol., Boulder, CO, USA

Volume

30

Issue

6

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

4560

Lastpage

4562

Abstract

Eddy-current decay is a unique, nondestructive method for determining the low-temperature resistivity of large samples of pure metal. Furthermore, it is the only means available for measurement of the residual resistivity ratio (RRR), ρ(273 K)/ρ(4 K) of samples with shapes that do not lend themselves to conventional four-wire resistance measurement techniques. An improvement to an earlier implementation of the eddy-current decay method of resistivity characterization is presented. It involves modernizing the earlier apparatus by the use of a digitizing oscilloscope, commercial curve-fitting software, digital averaging techniques, and modern electronics. Data are shown for high-purity copper cylinders

Keywords

eddy current losses; eddy current testing; electrical conductivity measurement; commercial curve-fitting software; digital averaging techniques; digitizing oscilloscope; eddy-current decay method; low-temperature resistivity; residual resistivity ratio; resistivity characterization; Circuits; Coils; Conductivity; Copper; Curve fitting; Delay; Electrical resistance measurement; Oscilloscopes; Shape measurement; Voltage;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.334148

Filename

334148