A PHOTOGRAMMETRIC METHOD FOR DETERMINING THE TOPOGRAPHY OF LIQUID SURFACES
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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A stereophotogrammetric method was developed for the determination of the topography of liquid surfaces, which serve as an analogue for gas pressures and velocities in the evaluation of turbine performance. An instrumentation system has been constructed, consisting of two modified Wild RC-7 cameras with microflash projection of a random pattern of spots to identify the water table surface. The reduction of the data was accomplished by both analogue and analytical methods. The analogue method, including automatic plotting, was the more economical and yielded an accuracy of 120 microns. The analytical method, involving manual plotting, resulted in an overall accuracy of 60 microns, and an accuracy of 30 microns for small areas near the center.
- Fluid Mechanics