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Application of a radiometric density meter to monitor changes in coal bed density during a pulsation cycle in a jig has been presented. The signal from the radiation detector has been filtered in an adaptive filter to react properly to rapid changes in density. The radiometric density meter has been used to measure density of a coal layer 3 cm thick and 30 cm wide. The distribution of the material density along the bed height has been measured during field tests performed on the industrial jig. Changes in density have shown the process of material loosening and its compression during each cycle of pulsations

Monitoring of the pulsation cycle in a jig using a radiometric density meter