Measurement Principles of Shadow Sizing

image of shadow sizer setup
Shadow Sizer setup: light source, camera and DynamicStudio software for images acquisition and processing.

The object is backlit with a light source and a camera acquires the shadow image of the object. With a particle flow, a short light flash and a synchronisation device are used to freeze the particle motion.

The image is analysed with an advanced edge detection algorithm to extract the object or particle shape information. The velocity information is extracted by combining correlation algorithm and measuring displacement between two successive images via a dedicated particle tracking algorithm.

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