Microwave noncontact examination of disbond and thickness variation in stratified composite media

Bakhtiari, Sasan; Qaddoumi, Nasser; Ganchev, S.I.; Zoughi, R.

doi:10.1109/22.277431

Cited by 111 publications

(53 citation statements)

References 13 publications

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“…Evaluation of the thickness of dielectric slabs is of great interest in many aspects of the industry, such as the monitoring of thickness variation of composite materials coatings on other substrates [26,27]. Following, investigation on the effectiveness for nondestructive measurement of the thickness of a lossy dielectric slab using the parallel-plate waveguide probe and the OEC is presented.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…Furthermore, these techniques are destructive. The solutions to nondestructive dielectric measurements of material at high frequency are thus limited to transmission techniques using open-ended coaxial (OEC) probe [21][22][23][24], open-ended rectangular waveguide [25][26][27][28] and free-space method [29]. The latter two present frequency limitations that affect the size of the MUT to be used.…”

Section: Introductionmentioning

confidence: 99%

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An Improved Method for Microwave Nondestructive Dielectric Measurement of Layered Media

Zhang¹,

Tan²,

Tan³

2008

PIER B

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Abstract-This paper presents an improved method for microwave nondestructive dielectric measurement of layered media using a parallel-plate waveguide probe. The method bases on measuring the S parameter S 11 or reflection coefficient from the N -layer media over the range of 1 to 10 GHz. Formulation for the aperture admittance is presented which allows the solving of the inverse problem of extracting the complex permittivity for two cases of the media, (1) one that terminates into an infinite half-space, (2) one that terminates into a sheet conductor. Our theoretical analysis allows the study of the effects of air gaps and slab thickness on the probe measurements. Through numerical simulations, the ability to use the proposed method for dielectric spectroscopy and thickness evaluation of layered media is demonstrated.

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Section: Numerical Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Improved Method for Microwave Nondestructive Dielectric Measurement of Layered Media

Zhang¹,

Tan²,

Tan³

2008

PIER B

View full text Add to dashboard Cite

show abstract

“…This can be accomplished by using a previously developed electromagnetic formulation (referred to as the "nlayer" code) to calculate the reflection coefficient at the aperture of an open-ended rectangular waveguide radiating into a generally layered medium given the dielectric properties and thickness of each layer including the operating frequency [28]. Fig.…”

Section: B Modeling Proceduresmentioning

confidence: 99%

Semiempirical Electromagnetic Modeling of Crack Detection and Sizing in Cement-Based Materials Using Near-Field Microwave Methods

Nadakuduti

Chen

Zoughi

2006

IEEE Trans. Instrum. Meas.

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Abstract-Detection and characterization of cracks in cementbased materials is an integral part of damage evaluation for health monitoring of civil structures. Microwave signals are able to penetrate inside of dielectric materials (e.g., cement-based materials) and are sensitive to local, physical, geometrical, and dielectric variations in a structure. This makes microwave nondestructive testing and evaluation (NDT&E) techniques suitable for inspection and health monitoring of civil structures. Near-field microwave NDT&E techniques offer the added advantage of providing high spatial resolution, requiring simple hardware that may be portable, low power, fast, real time, and robust. Additionally, these techniques are noncontact and one-sided. Besides the need for robust detection, electromagnetic modeling of a microwave probe response to a crack is also an important issue. Such a model can be used to obtain optimal measurement parameters and serve as the foundation for extracting important crack information such as its width and depth. In this paper, the utility of open-ended rectangular waveguide probes for detecting surface-breaking cracks in cement-based materials is discussed. Subsequently, the development of a semiempirical model capable of simulating the crack response is presented. The model described here translates the magnitude and phase of the reflection coefficient as a function of scanning distance into the complex reflection plane and takes advantage of the common shape of these signals for predicting a similar signal from an unknown crack. Finally, this empirical model is used to estimate crack dimensions from a set of measurements.

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“…For a thicker and lossier dielectric coating the overall signal level will decrease. However, one may cover the waveguide aperture with a known dielectric layer and use it, much like a lense, to increase detection sensitivity so that cracks covered with relatively thick coatings may also be detected [4].…”

Section: Measurements On Coated Surfacesmentioning

confidence: 99%

Higher Order Modes as Indicators of Surface Cracks Under Stratified Dielectric Coatings Using an Open-Ended Waveguide

Huber

Zoughi

1995

Review of Progress in Quantitative Nondestructive Evaluation

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Microwave noncontact examination of disbond and thickness variation in stratified composite media

Cited by 111 publications

References 13 publications

An Improved Method for Microwave Nondestructive Dielectric Measurement of Layered Media

An Improved Method for Microwave Nondestructive Dielectric Measurement of Layered Media

Semiempirical Electromagnetic Modeling of Crack Detection and Sizing in Cement-Based Materials Using Near-Field Microwave Methods

Higher Order Modes as Indicators of Surface Cracks Under Stratified Dielectric Coatings Using an Open-Ended Waveguide

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