Microwave array 3-D imaging is an emerging technique capable of producing a 3-D map of scattered electric fields. Its all-weather and large scene imaging features make it an attractive powerful tool for target detection and feature extraction. Typically, a microwave array 3-D imaging system based on the classical sampling theory requires a large dense 2-D antenna array, which may suffer from a ...

We present the photoacoustic imaging velocimetry (PAIV) method for flow-field measurement based on a linear transducer array. The PAIV method is realized by using a Q-switched pulsed laser, a linear transducer array, a parallel data-acquisition equipment and dynamic focusing reconstruction. Tracers used to track liquid flow field were real-timely detected, two-dimensional (2-D) flow visualizati...

This study introduces a new imaging method of detection marks of ferromagnetic material, based on the Hall sensor array. Unlike the traditional NDT imaging technology, the technique presented is measuring magnetic field of ferromagnetic material surface and reading the difference by imaging the magnetic signals to find the marks. The study also introduces the principle and the system architectu...

The benefits of terahertz (THz) radiation have increased its use, especially in imaging systems. Recently, the use a linear sparse periodic array (SPA) has been proposed as an effective solution for two-dimensional (2D) scanning THz However, special multistatic structure SPA is such that it not possible to apply fast Fourier transform-based techniques directly near-field (NF). Therefore, this p...

This paper proposes an imaging scheme using a random sparse array (RSA) structure for radar target detection using compressed sensing (CS). The array collects sparse measurements with less collection time and data storage. Two schemes of the RSA are considered, random SAR mode and random array mode. Performances of both static and moving target detections are investigated. Performance of RSA wi...

In the recent years, the optimization techniques using evolutionary algorithms have been widely used to solve electromagnetic problems. These algorithms use thinning the antenna arrays with the aim of reducing the complexity and thus achieving the optimal solution and decreasing the side lobe level. To obtain the optimal solution, thinning is performed by removing some elements in an array thro...

This paper describes the synthesis of digitally excited pencil/flat top dual beams simultaneously in a linear antenna array constructed of isotropic elements. The objective is to generate a pencil/flat top beam pair using the excitations generated by the evolutionary algorithms. Both the beams share common variable discrete amplitude excitations and differ in variable discrete phase excitations...

Evolution of high resolution ultrasonic imaging is widely dependent on the development of efficient high frequency piezoelectric transducers. Nowadays, efforts are focused on the fabrication of linear arrays in the 40-50 MHz frequency range for dermatology, ophthalmology and small animals imaging. At these frequencies, technological aspects are predominant at several stages of the array fabrica...