DEVICE FOR MEASUREMENT OF MAGNETIC SENSING OF ORE MATERIALS Russian patent published in 1994 - IPC

FIELD: measurement technology. SUBSTANCE: device for measurement of magnetic sensing of ore materials has induction probe and circuit for automatic correction of zero signal of induction probe composed of adder, counter, digital-to-analog converter, former of time interval (pulse generator and frequency divider connected in series), flip-flop, two comparators, two voltage setting units and pickup of movement of conveyer. Circuit for automatic correction makes it possible to correct zero signal for duration of lack of ore material on moving conveyer. Correction of zero signal is performed by minimal value of signal across output of induction probe but not by average signal like in prototype device. Minimal value of signal at output of induction probe depends in lesser degree on small pieces of ore left on conveyer belt occasionally than average level of background signal at output of induction probe which provides for more accurate correction of zero signal of device. EFFECT: increased accuracy of measurements. 3 dwg