Title :
A multiview microwave imaging system for two-dimensional penetrable objects
Author :
Caorsi, Salvatore ; Gragnani, Gian L. ; Pastorino, Matteo
Author_Institution :
Dept. of Biophys. & Electron. Eng., Genoa Univ., Italy
fDate :
5/1/1991 12:00:00 AM
Abstract :
A microwave imaging system is based on a multiview numerical solution to the integral equation of 2D transverse magnetic (TM) scattering is proposed. This solution is achieved by the moment method, and a pseudoinversion transformation is used to face ill-conditioning problems. All experimental setup is described that uses a scanning subsystem for measuring the values of the scattered electric field inside an observation domain located outside the investigation one (i.e., the area containing the cross sections of cylindrical dielectric scatters). Rotations of the investigation domain with respect to the scanning subsystem and the transmitting antenna allow a multiview imaging process. The imaging system does not require plane-wave illumination and does not use any first-order approximations; hence, it may be used even in the case of strong scatterers. The offline and once-and-for-all computation of the pseudoinverse matrix allows an inexpensive reconstruction in terms of computer resources. Some tests of the system were carried out, and the results are reported
Keywords :
electromagnetic wave scattering; integral equations; microwave imaging; picture processing; 2D TM scattering; integral equation; moment method; multiview microwave imaging system; multiview numerical solution; pseudoinverse matrix; pseudoinversion transformation; scattered electric field; strong scatterers; transverse magnetic; two-dimensional penetrable objects; Antenna measurements; Area measurement; Dielectric measurements; Electric variables measurement; Integral equations; Magnetic domains; Magnetic field measurement; Microwave imaging; Moment methods; Scattering;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on