| 摘要 |
PURPOSE:To determine charge level of a powdery material existing isolated directly in a simple and quick manner by measuring charge electrostatically introduced with a charge of the measuring powdery body and accumulated in a capacitor. CONSTITUTION:When a measuring powdery material 5 charged in positive polarity attaches (3-1) to the surface of a sample 6 to be measured, a negative charge is induced with a charge of the measuring powdery body 5 and flows in the direction of the arrow passing through a switch S and accumulated (3-2) in the sample 6 being measured to the level equal to the positive charge. Now when the switch S is opened and a suction nozzle 7 is operated to suck the measuring powdery body 5 of positive polarity peeled forcibly off the surface of the sample 6 being measured, charge of the negative polarity accumulated in the sample being measured is accumulated in one electrode of a capacitor 28 and the charge of the opposite polarity is accumulated in the other electrode thereof (3-3, 3-4). Therefore, when the capacity of the capacitor is represented by C and the voltage between both the electrodes V, the charge level of the measuring powdery body 5 can be determined by q=CXV. |
