We present a projection optical system incoporating a dynamic optical element and we outline some of its potentional applications for digital projections. We describe experiments undertaken to validate a variety of these applications, in particular: change of focus without mechanical motion of the focus group; correction of chromatic aberration; and correction of a variety of other aberrations. We conclude that dynamic optical element can be used to improve the quality of image achieved from a very simple digital projection optical system.
Thermal sprayed coatings have wide engineering applications. There now exists a wide range of destructive and nondestructive testing (NDT) methods for surface coating inspections. This paper describes an application of Electronic Speckle Pattern Shearing Interferometry (ESPSI) for NDT of thermal sprayed surface coatings. In contrast to other conventional methods such as eddy current, ultrasonic or X-ray, ESPSI allows fast and large survey area inspection. Experimental results of shearographic measurements are presented. Thermal sprayed coatings were tested using ESPSI. Delaminations of the coatings were detected and the fringe patterns were captured using this method. It is shown that the shearography technique can be applied successfully to surface coating quality inspection and it is very effective for delamination detection.