电晕放电紫外图像参数变化特性及距离修正

发布时间：2018-05-31 01:38

本文选题：电晕放电 + 日盲紫外成像　；参考：《仪器仪表学报》2014年08期

【摘要】：日盲紫外成像仪的增益和观测距离影响紫外图像中放电光斑区域大小,以棒-板间隙模型和绝缘子为研究对象,利用CoroCAM504紫外成像仪,在高压实验室研究了不同放电强度下光斑面积随增益和观测距离的变化特性并进行了拟合分析。研究表明光斑面积与增益之间近似满足指数函数关系,增益每增加10%,光斑面积约增加2倍。光斑面积与观测距离之间近似满足幂函数关系,幂指数在1.84左右波动。为将不同距离下的光斑面积修正到统一距离下从而使得检测结果具有可对比性,对增益分别为50%、60%、70%和80%的实验数据建立了基于最小二乘回归支持向量机(LS_SVM)的修正模型,测试表明该模型的具有较高的修正精度,可满足现场放电紫外成像检测的需要。
[Abstract]:The gain and observation distance of solar blind ultraviolet imager affect the size of discharge spot area in ultraviolet image. Taking the rod-plate gap model and insulator as the research object, the CoroCAM504 ultraviolet imager is used. The variation characteristics of spot area with gain and observation distance under different discharge intensity were studied in high voltage laboratory and the fitting analysis was carried out. The results show that the relationship between the spot area and the gain is approximately exponential function, and the area of the spot increases by about 2 times with the increase of the gain by 10 times. The power function relation between the spot area and the observed distance is approximately satisfied, and the power exponent fluctuates about 1.84. In order to correct the spot area at different distances to the uniform distance and make the detection results more comparable, a modified model based on least square regression support vector machine (LSSVM) was established for the experimental data with gain of 50% and 80%, respectively. The test results show that the model has high correction accuracy and can meet the needs of field discharge ultraviolet imaging detection.
【作者单位】：华北电力大学河北省输变电设备安全防御重点实验室;
【基金】：国家自然科学基金(51077054) 河北省自然科学基金(E2012502055) 中央高校基本科研业务费专项资金(12QN36)资助项目
【分类号】：TM855

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