Quantitative Space and Time Resolved Laser Schlieren System for the Study of Hypersonic Flow

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Abstract
A space and time resolved quantitative schlieren system has been developed for the measurement of density gradient distributions in a two‐dimensional hypersonic flow field. The device uses a narrow beam helium‐neon continuous laser which is scanned across the flow field by a fast revolving multifaced mirror. A knife edge‐photomultiplier assembly monitors the deflection of the laser beam caused by the presence of density gradients in the test gas. Spatial resolution which is determined by the diameter of the laser beam in the flow field is less than 0.6 mm. Time resolution is determined by the speed of rotation of the mirror and the number of mirror faces but in the present setup it is limited to approximately 2×10−3 sec by the frequency response of the data recording system. Quantitative performance has been checked for a known density gradient which was simulated by the use of an accurately specified glass wedge.

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