Phased arrays are now widely used in ultrasonic non destructive testing, as they provide improved versatility with comparison to conventional monolithic probes. Apart from the intrinsic abilities to steer and to focus the beam through planar, curved or irregular profiles, specific phased arrays acquisition schemes can also be applied. Electronic commutation (a group of elements over a large arr...

Ultrasonic phased arrays are an emerging technology in nondestructive evaluation (NDE) applications. A phased array is a multi-element piezo-electric device whose elements are individually excited by electric pulses at programmed delay times [1]. Such a delay scheme allows electronically controlled dynamic beam control. One of the advantages of using phased arrays in NDE applications over conve...

To enable analysis and visualization of phased behavior in Java programs and to facilitate optimization development, we have implemented a freely-available, phase analysis framework within JikesRVM. The framework couples existing techniques into a unifying set of tools for data collection, processing, and analysis of dynamic phased behavior in Java programs. The framework enables optimization d...

A novel phased array antenna with wide bandwidth and wide scan angle is presented. The radiating aperture of the phased array consists of periodically and closely spaced octagonal ring elements. Tight capacitive coupling between adjacent elements is realized by interdigitating the end portions of the ring elements. To improve the impedance matching of the individual antenna elements over wide f...

There are a number of potential applications for low cost short range phased array radar sensors: ship bumpers, large vehicle sensors and level crossing obstacle detection for example. Phased arrays have the benefit of reduced size and the elimination of moving parts compared with more traditional rotating antenna systems. Another potential benefit is that the image update rate can be orders of...

Abstract A high-resolution (  > 10 5 ), multi-mode fiber-fed spectrograph on large telescopes with a reasonable size is desirable i...