Laboratory studies
DM&A have enjoyed a long association with the Shock Studies Laboratory at the University of Victoria (Dr J.M. Dewey, Professor Emeritus, Department of Physics and Astronomy). The laboratory uses shock tubes for the study of shock-shock and shock-structure interactions, employing high-speed multiframe shadowgraph, schlieren and particle tracer photography and holographic inteferometry.

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Combined schlieren and particle tracer photography of a plane shock reflecting from a 10-degree wedge. The primary and reflected shock fronts and the Mach stem are seen on the right. The mirror in the background has a grid of small holes drilled in it, through which smoke was injected just before shock arrival to act as flow tracers. The holes also serve as a reference grid for checking optical distortion. The size of the view window in the shock tube is 25x30cm (the picture above is a partial view).

square3.gif (823 bytes) The Shock Studies Laboratory is used to study the fundamental aspects of shock and blast waves. Specialized high-speed cameras have been developed for research in the laboratory, including a laser/video system capable of 20,000 pictures per second. Automatic particle tracking methods in three dimensions using stereoscopic photography have also been developed.

square3.gif (823 bytes) DM&A have adapted their large-scale 'outdoor' photogrammetric transformation software to the schlieren optics used in the Shock Studies Laboratory, and have done photogrammetric analysis of films made in other laboratories, such as the Ernst Mach Institute in Germany and the Norwegian Defense Construction Service facility in Oslo. In addition to shock tube experiments, DM&A have analyzed films from spark chambers and micro-explosions.