| 摘要 |
A time interval (tau) with a length not greater than the pulse duration time (T = 1/f, where f = frequency) and not less than the pulse length (t) is defined for each frequency-height-length combination. A voltage function, f(U), is defined, calculated and integrated under tau, then this integral value is divided by the pulse length or a scale factor, depending on the pulse length, providing a figure which is used to determine the pulsing direct current frequency-height-length combination for continued operation. A periodically varying high voltage is maintained between emission and precipitation electrodes, and the pulsed direct current supplied to the electrodes is regulated. The frequency, pulse height and/or pulse length for the pulsed current is varied in order to give frequency-height-length combinations, and the voltage between the emission and precipitation electrodes is measured. |
