How to measure the volume of an empty vessel ?
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In this study, we discuss a direct method for measuring the volume of a bulk granular material inside a cylindrical storage vessel. The free surface of the bulk solid in a partially filled vessel is scanned by a dedicated camera system; images captured from the surface are then used to determine its profile. Volume of fill can then be found using the known geometry of the empty vessel. In addition, by making rapid successive measurements of fill volume, an estimate of the volumetric flow rate out of the vessel can be obtained. In all experiments the discharge flow was collected in a container that sat on the platform of a weighing device, enabling mass flow rate to be recorded during the whole discharge period. Scoping trials with mustard seeds revealed a linear relationship between mass and volume flow rates over most of the discharge period, indicating a relatively invariant mean bulk density. This optical technique has provided accurate and reproducible measurements of fill volume and due to ease of use and flexibility, may be suited for measurements in some industrial conditions where real-time measurements of fill volume and discharge rate are required