Study of Moire Measuring Techniques for Wind Tunnel Model Deformation
GENERAL APPLIED SCIENCE LABS INC WESTBURY NY
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An analytical and experimental study has been conducted to determine the feasibility of using Moire techniques for the accurate measurement of model distortions expected to be encountered in the HIRT Facility. A comprehensive study of the basic characteristics of Moire techniques has been carried out to determine the best approach which could both satisfy the constraints imposed by the size and configuration of the test section, and provide the necessary accuracy in the measurement of the local distortion. The results of the study suggest the selection of a measuring technique where the grating is an integral part of the surface of the test model. A Moire is formed by the superimposition of two images of the grating obtained in the undistorted and distorted condition of the test model. A null method of analyzing the Moire pattern allows the accurate measurement of the local distortion.
- Test Facilities, Equipment and Methods