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| Title: | Disbond thickness evaluation employing multiple-frequency near-field microwave measurements | |
| Author (s): | Abou-Khousa, Mohamed Zoughi, Reza | |
| Department/Lab Affiliations: | Applied Microwave Nondestructive Testing Laboratory Electrical and Computer Engineering University Transportation Center | |
| Keywords: | maximum likelihood (ML) multiple frequency measurements nondestructive evaluation (NDE) thickness estimation | |
| Issue Date: | 2007 | |
| Publisher: | Institute of Electrical and Electronics Engineers IEEE | |
| Citation: | Abou-Khousa, M. and Zoughi, R. “Disbond Thickness Evaluation Employing Multiple-Frequency Near-Field Microwave Measurements,” IEEE Transactions on Instrumentation and Measurement, vol. 56, no. 4, pp. 1107-1113, 2007. | |
| Abstract: | Near-field microwave nondestructive evaluation (NDE) techniques have shown great potential for disbond detection in multilayer dielectric composite structures. The high detection capability associated with these techniques stems from the fact that near-field microwave signals are sensitive to minute variations in the dielectric properties and geometry of the medium in which they propagate. In the past, the sensitivity of the near-field microwave NDE techniques to the presence and properties of disbonds in multilayer dielectric composites has been investigated extensively. However, a quantitative disbond thickness estimation method has yet to be introduced. In this paper, we propose a maximum-likelihood (ML) disbond thickness evaluation method utilizing multiple independent measurements obtained at different frequencies. We also introduce a statistical lower limit on the thickness resolution based on the mean-squared error in thickness estimation and a given confidence interval. The effectiveness of the proposed ML method is also verified by comparing simulation results with actual measurements. | |
| Type: | Article - Journal text | |
| In Title: | IEEE Transactions on Instrumentation and Measurement | |
| Copyright Notice: | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. allows publisher's final version to be uploaded FULL COPYRIGHT INFORMATION: | |
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| title | Disbond thickness evaluation employing multiple-frequency near-field microwave measurements | |
| contributor.author | Abou-Khousa, Mohamed | |
| contributor.author | Zoughi, Reza | |
| contributor.deptlab | Applied Microwave Nondestructive Testing Laboratory | |
| contributor.deptlab | Electrical and Computer Engineering | |
| contributor.deptlab | University Transportation Center | |
| contributor.sponsor | Air Force Research Lab | |
| subject | maximum likelihood (ML) | |
| subject | multiple frequency measurements | |
| subject | nondestructive evaluation (NDE) | |
| subject | thickness estimation | |
| date.issued | 2007 | |
| publisher | Institute of Electrical and Electronics Engineers IEEE | |
| identifier.citation | Abou-Khousa, M. and Zoughi, R. “Disbond Thickness Evaluation Employing Multiple-Frequency Near-Field Microwave Measurements,” IEEE Transactions on Instrumentation and Measurement, vol. 56, no. 4, pp. 1107-1113, 2007. | |
| identifier.pub.URI | ||
| description.abstract | Near-field microwave nondestructive evaluation (NDE) techniques have shown great potential for disbond detection in multilayer dielectric composite structures. The high detection capability associated with these techniques stems from the fact that near-field microwave signals are sensitive to minute variations in the dielectric properties and geometry of the medium in which they propagate. In the past, the sensitivity of the near-field microwave NDE techniques to the presence and properties of disbonds in multilayer dielectric composites has been investigated extensively. However, a quantitative disbond thickness estimation method has yet to be introduced. In this paper, we propose a maximum-likelihood (ML) disbond thickness evaluation method utilizing multiple independent measurements obtained at different frequencies. We also introduce a statistical lower limit on the thickness resolution based on the mean-squared error in thickness estimation and a given confidence interval. The effectiveness of the proposed ML method is also verified by comparing simulation results with actual measurements. | |
| type | Article - Journal | |
| type.DCMIType | text | |
| type.status | Final version | |
| rights | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. | |
| rights | allows publisher's final version to be uploaded | |
| rights.URI | ||
| rights.URI | ||
| rights.URI | ||
| relation.isPartOf | IEEE Transactions on Instrumentation and Measurement | |
| date.accessioned | 2008-07-28T19:03:16Z | |
| date.available | 2008-08-04T19:39:18Z | |
| identifier.persist.URI | ||
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