Monitoring of coal jig operation using a radiometric meter with a variable time of measurement

Authors discuss the problem of how to monitor the coal/water pulsating bed in a jig with the use of a radiation density meter. Time of measurement applied in radiation monitors is usually constant in industrial radiometric monitors. The dynamic error in the process of measuring changes in density depends on the time of measurement; its optimal value can be found for a given shape of density changes. Authors propose an alternative method of signal filtration for variable time of measurement during a cycle of pulsations. Good results can be achieved for a linear relation between the time of measurement and time derivative of the density. The time derivative of the density can be determined for a long period of time on the basis of industrial tests which establish average changes in density in subsequent cycles of pulsations. In this case, the dynamic error of measurement MSE can be reduced by half compared to the optimal constant time of the measurement.