Abstract
This contribution presents a simple and fast Synthetic Aperture Radar (SAR)-based technique for microwave imaging and material characterization from microwave measurements acquired in tomographic systems. SAR backpropagation is one of the simplest and fastest techniques for microwave imaging. However, in the case of heterogeneous objects and media, a priori information about the constitutive parameters (conductivity, permittivity) is needed for an accurate imaging. In some cases, a first guess of the constitutive parameters can be extracted from an uncorrected SAR image, and then the estimated parameters can be introduced in a second step to correct the SAR image. The main advantage of this methodology is that there is little or no need for a priori information about the object to be imaged. Besides, calculation time is not significantly increased with respect to conventional SAR, thus allowing real-time imaging capabilities. The methodology has been validated by means of measurements acquired in a cylindrical setup.
Highlights
Electromagnetic imaging is one of the most widespread techniques for nondestructive testing thanks to the capability of the electromagnetic waves to penetrate through different media [1].The different responses of these media depending on the working frequency band have resulted in a wide variety of electromagnetic imaging systems, in terms of hardware, and concerning processing techniques.Electromagnetic inverse scattering and imaging techniques are able to provide the geometry of the object/area under inspection, the constitutive parameters, or both.The capability of recovering these parameters with a certain degree of accuracy depends on the setup/hardware of the imaging system and the working frequency band(s), and on the post-processing algorithms
Factors such as the dynamic range or processing time have to be taken into account when selecting an imaging system that best fits the requirements for a particular nondestructive testing application
Validation of the methodology for fast estimation of constitutive parameters parameters from Synthetic Aperture Radar (SAR) images is conducted
Summary
Electromagnetic imaging is one of the most widespread techniques for nondestructive testing thanks to the capability of the electromagnetic waves to penetrate through different media [1]. The capability of recovering these parameters with a certain degree of accuracy depends on the setup/hardware of the imaging system and the working frequency band(s), and on the post-processing algorithms. Factors such as the dynamic range or processing time have to be taken into account when selecting an imaging system that best fits the requirements for a particular nondestructive testing application. As an example, detecting 15–20 cm size metallic targets buried
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