Patent ID: 9291494
Filing Date: 2016-03-22
CPC Classification: G01J,G01R,G02B,H04N

Claim Text:
1. A method for detecting AC power system high voltage discharge corona, said method comprising: providing an optical system, optical filter, and image sensor; generating a corona shutter, said corona shutter timed to occur during said discharge corona periods of said AC power system voltage waveform; generating an ambient shutter, said ambient shutter timed to occur between said discharge corona periods of said AC power system voltage waveform; receiving UV and visible light from said AC power system high voltage discharge corona using said optical system; removing a portion of said UV and visible light using said optical filter leaving filtered light, said filtered light composed of corona light and ambient light; focusing said filtered light onto said image sensor; converting said filtered light to corona-plus-ambient image by triggering said image sensor with said corona shutter; converting said filtered light to ambient image by triggering said image sensor with said ambient shutter; converting said corona-plus-ambient image to corona-only image by subtracting said ambient image from said corona-plus-ambient image; generating a corona frame by integrating one or more said corona-only image; generating an ambient frame by integrating one or more said ambient image; and displaying said ambient frame overlaid with said corona frame.