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Image drop sensor and edge analysis of the drop profile

The drop profile is one of the evident differences for different liquids. An image drop sensor is developed for capturing the drop profile images real-timely in various stages during the drop growth. The drop head for forming the uniform and satiated liquid drop is designed. The original profile records of pure water and 100% ethanol during their drop growth will be presented. Edge extraction methods on drop profile are discussed. Curve fitting based on third-order polynomial linear regression is used to mathematically describe the detected edge curves of the drop profile in sequential drop formation.