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van den Assem, D. (author), Huijser, R.H. (author), vreeburg, J.P.B. (author)An optical diagnostic instrument is being developed for execution and observation of fluid physics experiments in microgravity on board a manned space laboratory (e.g. Spacelab). The instrument combines a wide field scene and Schlieren observation system of a diffusely illuminated fluid physics experiment with a facility to operate various...report 1986