Abstract

A device has been developed to alleviate the effects of vibration induced into the schlieren system of a 1-m (40-in.) supersonic tunnel. The merits of using a closed-loop servo system to compensate for vibrations in a schlieren system are demonstrated. Included is a discussion of the schlieren system optics which compares the monitor light to the schlieren light path and illustrates the purpose of a monitor light source for control purposes. A brief explanation is given of the servo system and the method by which it positions the knife edge in response to the changes in light as sensed by a detector.

© 1965 Optical Society of America

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