SURFACE POTENTIAL DISTRIBUTION MEASURING DEVICE AND SURFACE POTENTIAL DISTRIBUTION MEASURING METHOD

摘要

In a surface potential distribution measuring device (1) for an electric field reduction system (3) of a rotating electrical machine, a Pockels crystal (25) is used between a laser (21) and the surface (test location (L)) of the electric field reduction system (3). Thus, the light intensity of a laser beam reflected on a mirror (24) provided between the Pockels crystal (23) and the test location (L) corresponds to an output voltage that is the voltage difference between the first end surface and the second end surface of the Pockels crystal. Even when an inverter voltage is generated, by using a light detector (25) having a frequency band capable of following the high frequency components of the inverter pulse voltage, the light intensity is detected by the light detector (25) . Therefore, from the light intensity (output voltage), the surface potential distribution measuring device (1) can measure the surf ace potential of the electric field reduction system (3) in which an inverter pulse voltage is generated.