Calibration of aspirator-type ion counters and measurement of unipolar charge densities

Measurement method of charge densities at ground level under high‐voltage direct current conductor

“…A sampling resistor R i is connected between the two electrodes. Charge density ρ m measured by the voltage U R of the sampling resistor and the air flow quantity F a aspirated by the fan installed at the end of the charge meter, is given as [7] F a = Sv…”

“…Inner and outer electrodes were connected to an electrometer and the ground, respectively, and air was aspirated into the device by an impeller. In 1986, Misakian et al [7] from National Bureau of Standards of America measured the charge density in the ionised field of parallel electrodes by a rectangular cuboid aspirator-type ion counter arranged in a cavity below the grounded electrode, in which a DC offset voltage was generated to deflect the charges aspirated. However, the device was not used at other locations in the field, or measured the charge density under the HVDC lines.…”

Calculation method of ion mobility spectrum for single‐measurement‐electrode Gerdien tubes

“…The advantage of the ion counter method is that it can measure the ion density at different heights within a certain range. Some researchers have applied this method to the measurement of corona ion density [7,[9][10][11][12][13][14][15].…”