Continuous non-contact measurement of electric charges of solid particles in pipes of pneumatic transport. I. Physical and mathematical models of a method

Physical and mathematical models are derived from an analysis of moving charged solid particles in pneumatic-transport pipes and their effect on an inductive ring probe (electrostatic transducer). The probe is connected to the high-resistance input of a specially designed amplifier through an electric circuit consisting of a capacitor of a high capacitance value. The effect of the voltage drop on the input impedance of the amplifier is proportional to the electric charge generated on solid particles during a flow in a pipe. The capacitor also makes it possible to attenuate or even eliminate the effect of electrical interference on the charge measurement. The interference results from the charging of a dielectric section of a pipeline by impacting solid particles.<<ETX>>