Development of a one-component Doppler Global Velocimeter

Due to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to digital@library.tamu.edu, referencing the URI of the item.Includes bibliographical references.An operational one-component Doppler Global Velocimetry (DGV) system including both hardware and data reduction software was developed and is described. This optical system uses a laser light sheet and a frequency-to-intensity image converter to acquire planar flow field images formed by the Doppler-shifted light scattered from a seeded flow field. The image converter produces images from the Doppler-shifted light whose intensity is a direct measure of Doppler shift, from which velocity components can be calculated at each pixel. The entire flow field within the image is measured simultaneously rather than scanned as done with point-by- point measurements obtained using conventional Laser Doppler Velocimetry (LDV). Data acquired using this system is correlated with other data sets for verification and to provide a quantified detailed definition of the flow field. The system was tested by measuring the velocity field across a II 2 mm wheel rotating at 15,000 rpm and a 12.7 mm diameter jet operating at a Mach number of 0. 15. The results are presented and compared with previously recorded LDV data