采用双水电极介质阻挡放电装置,在放电间隙d值较大的实验条件下进行了斑图实验,实验首次得到了稳定的八边形结构,并对其演化序列和时空动力学进行了研究.实验发现,随外加电压的升高,系统经历了随机分布放电丝-大半径放电丝-八边形结构-失稳的八边形结构的演化过程.通过对其时空相关性测量,发现八边形结构在每半个电压周期内有2次放电.为了进一步研究八边形结构,实验还给出了斑图随空气体积分数和外加电压变化的相图,以及八边形结构随气体压强和外加电压变化的相图.
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