Investigación

 

Detection of metallic cylindrical inclusions by thermoelectric coupling

 

H. Carreon ª and J.L. González-Carrasco^b

 

^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.

 

References

1. H. Carreon, J Alloy Compd 427 (2007) 183.         [ Links ]

2. H. Carreon, NDT & E Int 39 (2006) 22.         [ Links ]

3. H. Carreon, P.B. Nagy, and AH Nayfeh, J Appl Phys 88 (2000) 6495.         [ Links ]

4. J.H. Hinken and Y. Tavrin, Rev Progress Quant NDE 19 (2000) 2085.         [ Links ]

5. Y. Tavrin, G.S. Krivoy, and J.H. Hinken, Rev Progress Quant NDE 20 (2001) 1710.         [ Links ]

6. E. Rodriguez, R. Godinez, and E. Vazquez, Rev Mex Ing Biomed 26 (2005) 37.         [ Links ]

7. B.A. Auld, J.C. Moulder, J Nondestr Eval 18 (1999) 3.         [ Links ]

8. Y. Tavrin, M. Siegel and J.H. Hinken, IEEE Trans Appl Supercond 9 (1999) 3809.         [ Links ]

9. X. Kleber, NDT & E Int 41 (2008) 364.         [ Links ]

10. P.B. Nagy and A.H. Nayfeh, J Appl Phys 87 (2000) 7481.         [ Links ]

11. H. Carreon, Wear 265 (2008) 255.         [ Links ]

12. H. Carreon, S. Barriuso, G. Barrera, J.L. Gonzalez, and F.G. Caballero, Surf Coat Technol 206 (2012) 2942.         [ Links ]

13. H. Carreon, Int. Mech. Eng. Cong. & Exp. ASME-IMECE2011-62147 30 (2011) 1.         [ Links ]