Abstract
Fluid level monitoring is an important control process in engineering systems. The level measurement of fluids having changeable densities is a complex task. Most measurement methodologies use sensors that are periodically paused for recalibrations. For flammable liquids, this may be unsafe and even dangerous. This paper proposes a safe recalibrating-free computer-based methodology for measurement of fluid levels, which is based on Hough transform, image processing and normalization. This paper also describes experiments using a prototype of a distillation unit that was built especially to test the proposed methodology. The results from these experiments have demonstrated robustness, low-cost and suitability of the methodology for real crude oil level measurement in distillation processes.
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