Experiments in Fluids 29 (2000) 42±44 Ó Springer-Verlag 2000 D. R. Philpott A colour schlieren system with variable sensitivity and further re®nement is the introduction of a simple mech- orientation is described. Details of this spectrally based anism to allow knife-edge orientation to be easily changed. system are given, together with an analysis of the dual prism arrangement which is designed to provide variable Variable sensitivity system sensitivity without the need for extensive system realign- The system (Fig. 1) is based on the single prism system ment. (Greenberg et al. 1995; Holder and North 1952; Merzkirch 1982) in which the system at P is replaced by a single List of symbols prism. This produces a spectrum which is focussed by the f focal length of mirrors ®rst and second mirrors onto the slit, K. If the observation K position of second slit region is undisturbed, the colour of the ®nal camera image L light source corresponds to the mean wavelength of the light passing O region under observation through K. Although uniform, it is not monochromatic but P1 First prism a mixture of a range of wavelengths determined by the P2 second prism width of the light source slit
Experiments in Fluids – Springer Journals
Published: Jul 5, 2000
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