| 摘要 |
PURPOSE: A method and a system for evaluating local compactness of a granular material are provided to locally and directly evaluate the compactness of the granular material, to secure high reliability and to reduce the cost. CONSTITUTION: A method for evaluating local compactness of a granular material comprises steps of setting up a compactness evaluation system(1) comprising a capacitive sensor, and a conditioning and control circuit(6) for conditioning and controlling the capacitive sensor and capable of evaluating the variation in impedance of the capacitive sensor; placing the sensor inside a region of a container(3) in which the compactness of the granular material is to be evaluated; feeding the granular material into the container and into contact with or close proximity to the capacitive sensor; and directly evaluating, via the conditioning and control circuit, the local compactness of the granular material contacting or in close proximity to the capacitive sensor, on the basis of the variation in the impedance of the capacitive sensor, and in particular in the capacitive component of the impedance.
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