A K-band microwave interferometer for non-destructive sensing of high frequency low amplitude (nm) vibration is demonstrated. This sensor uses direct-conversion receiver architecture with a phase shifter to adjust its sensitivity while varying the target distance. Detection of nanoscale vibration and laser-generated ultrasound waves through thin aluminum plate are measured and then compared wit...

The objective of this paper is to show that time-reversal invariance can be exploited in acoustics to create a variety of new methods in non-destructive testing. Two different approaches will be discussed. The first one is the iterative time reversal process. It is an adaptive technique that can be used to detect flaws in complex samples with arrays of transducers. A second technique will also ...

A realistic model for natural language generation must account for overt revisions of the syntactic structure (self-corrections) as well as covert revisions (backtracking on syntactic options). This paper presents the preliminaries of a hybrid architecture for grammatical encoding (the ‘tactical’ phase in sentence generation) which allows such revisions. This architecture combines the concept o...

Sophisticated methods have often been developed in order to analyze the structure of materials and, in particular, to explain their microstructure or to make clear internal and superficial defects, such as cracks and notches. It is known, in fact, that the properties which determine the choice of a particular material for scientific applications strictly depend on its microstructure. Moreover, ...

The contribution deals with state of the art non-destructive testing method – active infrared thermography. The method can be used for revealing of defects and inhomogenities inside the bodies, e.g. bubbles and cracks in materials, which can have crucial importance from the point of view of their physical-mechanical properties. Goal of the research is theoretical evaluation of the performance o...