Droplet Image Feedback Control System in Evaporation Experiment |
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Authors: | Qiang Yu Shijie Cai Zhiqiang Zhu Qiusheng Liu Binghong Zhou |
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Affiliation: | (1) Image Processing Systems Laboratory, Department of Electrical Engineering, University of Washington, Seattle, WA, USA;(2) Department of Radiology, University of Washington, Seattle, WA, USA; |
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Abstract: | In order to realize the steady-state droplet evaporation, image feedback control system is designed based on DSP. The system
has three main functions: to capture and store droplet images during the experiment; to calculate droplet geometrical and
physical parameters such as volume, surface area, surface tension and evaporation velocity at a high-precision level; to keep
the droplet volume constant. The DSP can drive an injection controller with the PID control to inject liquid so as to keep
the droplet volume constant. The evaporation velocity of droplet can be calculated by measuring the injected volume during
the evaporation. The structure of hardware and software of the control system, key processing methods such as contour fitting
and experimental results are described. |
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Keywords: | |
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