CAJ | 학술논문

由长时间尺度大量丝状放电组成的介质阻挡放电的分布均匀性评价目前并无合适的方法，前期研究曾提出利用图像灰度标准差(standard deviation，Std)识别分布均匀放电和丝状放电，但对于采用灰度Std定量评价这种放电分布均匀性还缺乏分析。通过提出多个微放电灰度叠加模型，计算了多个微放电不同叠加形式的灰度 Std，探讨了采用灰度 Std评价丝状放电分布均匀性的可行性。计算结果显示：在微放电个数较少时，灰度Std虽小，但放电不均匀；当微放电个数超过一定值时，灰度Std越小，放电越均匀。这表明灰度Std在微放电足够多时可以反应放电分布均匀性。实验结果与计算结果吻合。因此，在曝光时间等拍摄条件一致时，灰度Std可以定量评价不同工况下丝状放电分布均匀性。
유장시간척도대량사상방전조성적개질조당방전적분포균균성평개목전병무합괄적방법，전기연구증제출이용도상회도표준차(standard deviation，Std)식별분포균균방전화사상방전，단대우채용회도Std정량평개저충방전분포균균성환결핍분석。통과제출다개미방전회도첩가모형，계산료다개미방전불동첩가형식적회도 Std，탐토료채용회도 Std평개사상방전분포균균성적가행성。계산결과현시：재미방전개수교소시，회도Std수소，단방전불균균；당미방전개수초과일정치시，회도Std월소，방전월균균。저표명회도Std재미방전족구다시가이반응방전분포균균성。실험결과여계산결과문합。인차，재폭광시간등박섭조건일치시，회도Std가이정량평개불동공황하사상방전분포균균성。
Currently there is no effective method to evaluate the distribution uniformity of barrier discharge consisted of numerous filaments within a long time duration, and a previous research classified the uniform and filamentary discharge by the standard deviation (Std) of gray levels, while using the Std of gray levels to quantitative evaluate the distribution uniformity of filamentary discharge needs further analysis. A multiple microdischarge superposition model is proposed, and the effect of multiple microdischarges superimpositions on the distribtution uniformity and Std of gray levels is investigated. The calculation results show that even the Std of gray levels is small, while the discharge is non-uniform in the case of a small number of microdischarges. When the number of microdischarge is large enough, the smaller the Std of gray levels, the more uniform the discharge. This suggests the Std of gray levels could reflect the gray dispersion from the mean of gray levels. The experimental results identified the calculation results. And moreover if the shooting conditions maintain consistent, the Std of gray levels is a good indicator of the distribtution uniformity of filamentary discharge in a long time scale.