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Revista mexicana de física
versión impresa ISSN 0035-001X
Rev. mex. fis. vol.58 no.5 México oct. 2012
Investigación
Detection of metallic cylindrical inclusions by thermoelectric coupling
H. Carreon ª and J.L. González-Carrascob
a Instituto de Investigaciones Metalúrgicas (UMSNH-IIM) Ciudad Universitaria, Morelia, Mexico, tel: + 011-52-443-316-7414 e-mail: hcarreon@umich.mx
b Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Avda. Gregorio del Amo 8, E28040 Madrid, España.
Recibido el 1 de febrero de 2012;
Aceptado el 29 de mayo de 2012
Abstract
In this paper, we present a technique that can give information on surface metallic inclusions embedded in a host material, i.e. by the magnetic sensing of local thermoelectric currents produced when a temperature gradient is established in the material. These thermoelectric currents generate flux magnetic densities that are detected by a highly sensitive magnetometer. A comparison between reported analytical results with experimental data of the magnetic field produced by thermoelectric currents around surface-breaking cylindrical tin inclusions in copper under external thermal excitation for different lift-off distances between the sensor and the surface of the specimen is presented. The diameter of the inclusions varied from 4.76 to 12.7 mm at different lift-off distance magnetometer probe and the specimen 1 to 8 mm respetively. A fairly modest 1.46° C/cm temperature gradient in the specimen produced magnetic flux densities ranging from 60 to 1460 nT.
Keywords: Thermoelectric measurements; magnetic flux density; cylindrical inclusions; magnetometer.
PACS: 85.80.Fi; 85.70.Ag; 85.75.Ss; 81.05.Bx; 85.70.Ex
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Acknowledgment
This work was performed at UMSNH-MEXICO and CENIM-ESPANA with funding from CONACYT-MEXICO under project CB-80883.
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