Berlin 2001 – scientific programme

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K: Kurzzeitphysik

K 1: Short time-scale dynamics and diagnostics

K 1.6: Talk

Monday, April 2, 2001, 17:50–18:05, EB107

Possibilities and problems of the 3-D High-Speed Cinematography — •F. Eisfeld — Universität Kaiserslautern

Many fast events are 3-dimensional but investigations, using high-speed cameras, yield only 2-dimensional explanations. Some examples of interest are flows, crash tests, the motion of flying objects or of sportsmen and so on. Therefore, it was investigated which stereoscopic methods could be used to study 3-D processes. The choice of the optimal method is dependent on the investigated event. To record the spreading of an in- jection jet in a laboratory other methods have to be used than for recording an explosion of a smoke bomb in open air or the motion of a sportsman in the high jump on a sports field. The problem is that for a quantitative interpretation of 3-D events, images taken in 2 different planes are necessary. Therefore, tests set ups with 2 cameras are used. The problems are that the position of the cameras must be determined exactly and that the 2 cameras must take these images absolutely simultaneously. A solution of this problems is to use a 3-D supplement which makes possible to take 2 images simultaneously. The other advantage is that the optical basis is exactly known. An other problem is the analysis of the images, in order to estimate 3-dimensional motions. this is possible with qualified PC programs. But the double image films can’t be used fo a cinema performance, because the human eyes cannot superimpose these 2 images to a 3-D image. All these possibilites and problems are described in this paper.