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Nonorthogonal Measurement Axes in Laser Doppler Velocimetry
Final rept. Oct 1977-Sep 1978
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
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The measurement axes of virtually all multiaxis laser Doppler velocimeter LDV systems are nonorthogonal to some degree and are, in general, rotated with respect to orthogonal, Cartesian reference axes. Systematic errors are introduced into the LDV data if axis nonorthogonality and spatial orientation parameters are not properly taken into account by the data reduction equations. This report develops the general 3-space expressions for velocity vector magnitude and spatial orientation in terms of rotated, oblique LDV measurement axis parameters and the velocity vector projections measured by each of these axes. Doppler systems, Laser velocimeters, Measurement, Orthogonality, Cartesian coordinates, Information, Velocity, Fluid flow.
APPROVED FOR PUBLIC RELEASE