Reconfigurable MIMO FMCW Imaging Technique and Applications in Acoustical and Microwave Imaging

2015 ◽  
pp. 281-298
Author(s):  
Michael Lee
Keyword(s):  
Imaging Technique ◽  
Microwave Imaging

scholarly journals An Innovative Microwave-Imaging Technique for Nondestructive Evaluation: Applications to Civil Structures Monitoring and Biological Bodies Inspection

2006 ◽  
Vol 55 (6) ◽  
pp. 1878-1884 ◽  
Author(s):  
Manuel Benedetti ◽  
Massimo Donelli ◽  
Anna Martini ◽  
Matteo Pastorino ◽  
Andrea Rosani ◽  
...  
Keyword(s):  
Nondestructive Evaluation ◽  
Imaging Technique ◽  
Microwave Imaging ◽  
Civil Structures

A Microwave Imaging Technique for Neck Diseases Monitoring

2021 ◽  
Author(s):  
Chiara Dachena ◽  
Alessandro Fedeli ◽  
Alessandro Fanti ◽  
Matteo B. Lodi ◽  
Matteo Pastorino ◽  
...  
Keyword(s):  
Imaging Technique ◽  
Microwave Imaging

scholarly journals Detection of Cracks in Concrete Structure Using Microwave Imaging Technique

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
E. A. Jiya ◽  
N. S. N. Anwar ◽  
M. Z. Abdullah
Keyword(s):  
Crack Detection ◽  
Imaging Technique ◽  
Reconstruction Algorithm ◽  
Microwave Imaging ◽  
Structural Failure ◽  
Manual Inspection ◽  
Vibration Technique ◽  
Small Cracks ◽  
Evaluation Techniques ◽  
Nondestructive Evaluation Techniques

Cracks in concrete or cement based materials present a great threat to any civil structures; they are very dangerous and have caused a lot of destruction and damage. Even small cracks that look insignificant can grow and may eventually lead to severe structural failure. Besides manual inspection that is ineffective and time-consuming, several nondestructive evaluation techniques have been used for crack detection such as ultrasonic technique, vibration technique, and strain-based technique; however, some of the sensors used are either too large in size or limited in resolution. A high resolution microwave imaging technique with ultrawideband signal for crack detection in concrete structures is proposed. A combination of the delay-and-sum beamformer with full-view mounted antennas constitutes the image reconstruction algorithm. Various anomaly scenarios in cement bricks were simulated using FDTD, constructed, and measured in the lab. The reconstructed images showed a high similarity between the simulation and the experiment with a resolution of λ/14 which enables a detection of cracks as small as 5 mm in size.

Microwave Imaging for the Integrity Assessment of IC Packages

2000 ◽  
Vol 123 (1) ◽  
pp. 42-46 ◽  
Author(s):  
Y. Ju ◽  
M. Saka ◽  
H. Abe´
Keyword(s):  
Reflection Coefficient ◽  
Imaging Technique ◽  
Coaxial Line ◽  
Dielectric Materials ◽  
Microwave Imaging ◽  
Promising Technique ◽  
Factors Affecting ◽  
Integrity Assessment ◽  
Soldering Process ◽  
Effective Reflection Coefficient

Since IC packages have been made thinner and smaller, the delamination and crack, which may be induced in the soldering process, have become important factors affecting the reliability of the package. The ability to penetrate deeply inside dielectric materials, and to reflect completely at the metal surface makes microwave inspection very suitable to detect such delamination. The authors have recently developed a new microwave imaging technique that uses an open-ended coaxial line sensor to detect the delamination in IC packages. The image was created by measuring the phase of the effective reflection coefficient at the aperture of the coaxial line sensor. For better evaluation of the shape and the size of the delamination, a method to further increase the spatial resolution of microwave imaging was studied in the present paper. The resolution affected by the dimensions of the sensor, the frequency of operation, and the standoff distance between the sensor and the sample was investigated by experiment. The experimental results indicate that microwave imaging is a promising technique for the integrity assessment of IC packages.

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