Nondestructive Evaluation of Microwave-Penetrable Pipes by Synthetic Aperture Imaging Enhanced by Full-Wave Field Propagation Model

• Published in: IEEE transactions on instrumentation and measurement Vol. 68; no. 4; pp. 1112 - 1119
• Main Authors: Laviada, Jaime, Wu, Baolong, Ghasr, Mohammad Tayeb, Zoughi, Reza
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.04.2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Anomalies; Aperture imaging; Circular synthetic aperture radar (SAR); deconvolution; Fourier transforms; Green's function methods; Green’s function; Inspection; Matched filters; Microwave imaging; Microwave theory and techniques; nondestructive evaluation; Nondestructive testing; pipe inspection; Pipes; Probes; Synthetic aperture radar; Wave propagation
• ISSN: 0018-9456; 1557-9662
• DOI: 10.1109/TIM.2018.2861078

A qualitative approach for microwave imaging multilayered cylindrical structures (e.g., dielectric pipes) is proposed in this paper. This approach relies on a modified circular synthetic aperture imaging technique that exploits closed-form Green's function to account for the different propagation delays, internal reflections, and refractions. The image can then be computed by employing a matched filter expressed in terms of efficient Fourier Transforms. Consequently, a high-resolution and contactless approach for the inspection of this kind of structures is achieved. Moreover, the computational resources to render the images are negligible. Practical aspects of the technique such as sampling criteria, resolution, and limitations of the technique are discussed. The efficacy of the method is illustrated via several examples including imaging of objects and anomalies inside different types of dielectric pipes.