| 摘要 |
A device and method of determining the voltage and current existing at the electrostatic electrode in a electrostatic spray gun, the spray gun containing a self-contained power supply including a turbine generator operating the air supplied to the gun, the power supply producing a low voltage d.c., and a voltage multiplier changing the voltage to a high potential which is applied to the electrode of the spray gun, a sensing and measuring circuit for determining the return current or ground current from the electrode to the power supply and producing a voltage directly related to the ground current and producing a voltage signal which may be measured directly to indicate the ground current; a circuit establishing a base voltage from the power supply for comparison against the ground current voltage signal and obtaining a differential voltage which may be measured and which is directly proportional to the electrode voltage. Both the ground current voltage signal and the differential voltage being applied into separate optical signal generators, producing optical signals, the frequency of which varies directly with the magnitude of the voltage being applied; fiber-optic cables transmitting the high frequency optical signals to remote locations, converter devices producing electrical signals, the frequency of which is directly porportional to the ground current voltage signal and to the differential voltage and LED displays receiving such high frequency electrical signals and displaying the electrode voltage and the ground contact or return current from the electrode to the power supply.
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