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Open-Ended Coaxial Probes for Nondestructive Testing of Substrates and Circuit Boards1

Published online by Cambridge University Press:  15 February 2011

James Baker-Jarvis  and
Michael D. Janezic
James Baker-Jarvis
Affiliation:
Electromagnetic Fields Division, National Institute of Standards and Technology, MS 813.08, Boulder, CO 80303–3328
Michael D. Janezic
Affiliation:
Electromagnetic Fields Division, National Institute of Standards and Technology, MS 813.08, Boulder, CO 80303–3328
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Abstract

The results of the full-wave model theory for the open-ended coaxial probe with lift-off are presented and are applied to measurements of thin materials. The model allows the study of the open-ended coaxial probe as a nondestructive testing tool. The equations presented are valid for both dielectric and magnetic materials. The analysis yields insight into the effects of air gaps on probe measurements. Numerical results indicate that the probe is very sensitive to lift-off at low frequencies. This sensitivity decreases somewhat as frequency increases. In order for the field to penetrate the air gap, larger size coaxial line or higher frequencies need to be used. An application of the theory is performed by numerically solving the inverse problem using measured reflection coefficient.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 347: Symposium O – Microwave Processing of Materials IV , 1994 , 215
Copyright
Copyright © Materials Research Society 1994

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Footnotes

1

U.S. Government work not protected by U.S. copyright

References

[1] Li, L. L., Ismail, N. H., Taylor, L. S., and Davis, C. C., IEEE Trans. Biomedicai Eng., 39, 49, (1992).Google Scholar
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[3] Baker-Jarvis, J. and Geyer, R. G., URSI Digest, URSI,. Presented at URSI, Boulder, CO. (January, 1992).Google Scholar
[4] Baker-Jarvis, J., Janezic, M. D., Geyer, R. G., and Domich, P. D., IEEE Trans. Instrum. Meas.fin press), (October, 1994).Google Scholar