You need JavaScript to view this

Resistivity measurements using a direct current induction method (1963); Mesure de resistivite par la methode d'induction en courant continu (1963)

Abstract

The conventional methods for measuring electrical resistivities necessitate the fixing of electrical contacts on the sample either mechanically or by soldering. Furthermore it is also necessary to carry,out the measurements on low cross-section samples which are not always easy to obtain. Our direct-current induction method on the other hand requires no contacts and can easily be applied to samples of large cross-section. The sample is placed in a uniform magnetic field; at the moment when the current is cut, eddy currents appear in the sample which tend to oppose the disappearance of the field. The way in which the magnetic flux decreases in the sample makes it possible to determine the resistivity of the material. This method has been applied to samples having diameters of between 1 and 30 mm in the case of metals which are good conductors. It gives a value for the local resistivity and makes it possible to detect any variation along a sample. The measurements can be carried out at all temperature from a few degrees absolute to 500 deg. C. We have used the induction method to follow the purification of beryllium by zone-melting; it is in effect possible to estimate the purity of  More>>
Authors:
Delaplace, J; Hillairet, J [1] 
  1. Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires
Publication Date:
Jul 01, 1964
Product Type:
Technical Report
Report Number:
CEA-R-2402
Resource Relation:
Other Information: 12 refs
Subject:
36 MATERIALS SCIENCE; DIRECT CURRENT; ELECTRIC CONDUCTIVITY; ENRICHMENT; INDUCTION; MAGNETIC FIELDS; MAGNETIC FLUX; PURIFICATION; TEMPERATURE DEPENDENCE; ZONE MELTING
OSTI ID:
20757677
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR06R2402064746
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
46 pages
Announcement Date:
Aug 19, 2006

Citation Formats

Delaplace, J, and Hillairet, J. Resistivity measurements using a direct current induction method (1963); Mesure de resistivite par la methode d'induction en courant continu (1963). France: N. p., 1964. Web.
Delaplace, J, & Hillairet, J. Resistivity measurements using a direct current induction method (1963); Mesure de resistivite par la methode d'induction en courant continu (1963). France.
Delaplace, J, and Hillairet, J. 1964. "Resistivity measurements using a direct current induction method (1963); Mesure de resistivite par la methode d'induction en courant continu (1963)." France.
@misc{etde_20757677,
title = {Resistivity measurements using a direct current induction method (1963); Mesure de resistivite par la methode d'induction en courant continu (1963)}
author = {Delaplace, J, and Hillairet, J}
abstractNote = {The conventional methods for measuring electrical resistivities necessitate the fixing of electrical contacts on the sample either mechanically or by soldering. Furthermore it is also necessary to carry,out the measurements on low cross-section samples which are not always easy to obtain. Our direct-current induction method on the other hand requires no contacts and can easily be applied to samples of large cross-section. The sample is placed in a uniform magnetic field; at the moment when the current is cut, eddy currents appear in the sample which tend to oppose the disappearance of the field. The way in which the magnetic flux decreases in the sample makes it possible to determine the resistivity of the material. This method has been applied to samples having diameters of between 1 and 30 mm in the case of metals which are good conductors. It gives a value for the local resistivity and makes it possible to detect any variation along a sample. The measurements can be carried out at all temperature from a few degrees absolute to 500 deg. C. We have used the induction method to follow the purification of beryllium by zone-melting; it is in effect possible to estimate the purity of a material by resistivity measurements. We have measured the resistivity along each bar treated by the zone-melting technique and have thus, localised the purest section. High temperature measurements have been carried out on uranium carbide and on iron-aluminium alloys. This method constitutes an interesting means of investigation the resistivity of solid materials. Its accuracy and rapidity make it particularly adapted both to fundamental research and to production control. (authors) [French] Les methodes classiques de mesure de resistivite electrique imposent la realisation sur l'echantillon de contacts electriques obtenus soit mecaniquement, soit par soudure. En outre, elles demandent, le plus souvent, d'effectuer les mesures sur des echantillons de faible section qu'il n'est pas toujours possible d'obtenir. Au contraire, la methode d'induction en courant continu que nous utilisons ne necessite aucun contact et s'applique tres bien aux echantillons de section importante. L'echantillon est place dans un champ magnetique uniforme; au moment ou l'on supprime le champ, des courants de Foucault, qui tendent a s'opposer a la disparition du champ, apparaissent dans l'echantillon. La loi de decroissance du flux magnetique dans l'echantillon permet de determiner la resistivite du materiau. Cette methode a ete appliquee a des echantillons de diametre compris entre 1 et 30 mm dans le cas de metaux bons conducteurs. Elle donne une valeur locale de la resistivite et permet d'en deceler toute variation le long d'un echantillon. Les mesures peuvent etre effectuees a toute temperature comprise entre quelques degres Kelvin et 500 deg. C. Nous avons utilise la methode d'induction pour suivre la purification du beryllium par fusion de zone: il est en effet possible d'evaluer la purete d'un materiau par des mesures de resistivite. Nous avons determine la valeur de la resistivite le long de chaque barreau de fusion de zone et localise ainsi la partie la plus pure. Des mesures a haute temperature ont ete faites sur le carbure d'uranium et sur des alliages fer-aluminium. Cette methode constitue un moyen d'investigation interessant de la resistivite des materiaux massifs. Sa precision et sa rapidite sont adaptees aussi bien aux etudes fondamentales qu'au controle de fabrication. (auteurs)}
place = {France}
year = {1964}
month = {Jul}
}