极不均匀电场中电晕放电紫外成像图像参量变化特性研究

Study on the corona discharge ultraviolet image parameters characteristic in extremely uneven electric Field

根据放电紫外成像的原理,利用数字图像处理算法分割提取了紫外图像中放电光斑区域,定义了"光斑面积"参数,利用该参数用于量化放电。研究了棒-板间隙电晕放电时的紫外图像,得到了光斑面积与紫外成像仪的观测距离、仪器增益两者之间的关系曲线并进行了理论上的分析,研究了光斑面积与放电电信号之间的关系,得到了光斑面积与放电脉冲幅值、累计放电量之间的关系曲线。分析表明光斑面积随观测距离、仪器增益和放电强度有着较好的变化规律,为量化放电提供了一种新的思路和方法。

According to the principle of ultraviolet（UV） imaging,discharge facular region in UV images was segmented with digital image processing algorithm,and the facular area parameter is defined,and is used it to quantify the discharge intensity.A rod-plane gap discharge UV imaging characteristic was researched,then the corresponding relationship curves of facular area to UV imager＇s observe distance,imager＇s gain were obtained and analyzed with theory.The relationship of facular area with current pulse signal was studied too,and the relationship curves of facular area to the current pulse＇s amplitude and accumulated discharge were obtained.Analysis showed that facular area has good correlation with the observe distance,imager gain and discharge intensity,and therefore it provided a new idea and method to quantify the discharge intensity.