中文摘要：

通过对在直流高压作用下低密度聚乙烯薄膜中注入的空间电荷的短路放电发光测量,研究了聚乙烯薄膜中空间电荷的复合率.通过短路放电光子数的测量及定量分析考察了电压极性、场强大小及加压时间对短路下电荷复合率的影响.结果表明发光强度（复合率）随外加场强的变化明显,而与加压时间的关系不显著.但场强高于80 MV/m时发光强度（复合率）的增大速度变慢.结合本实验结果及他人的相关数据,得出了聚乙烯薄膜样品的发光效率约为5.9×10^-6,短路初始阶段的0.2 s内样品的电荷复合率约为2.8%.

英文摘要：

In this paper,the recombination rate of charges in low density polyethylene（LDPE） film was obtained by measuring the number of photons released from the film when the film was short-circuit discharged after being set to high voltage of direct current（HVDC）.Under different designed conditions,including changing the polarity of HVDC and the value of applied field and the time duration of applied field,the amount of photons was measured to calculate the charges＇ combination rate.The result showed that the measured number of photons（recombination rate） was sensitive to the applied field but insensitive to the applying duration.When the field was higher than 80 MV/m,the number of released photon increased slowly with increasing voltage.Using the date obtained in our experiment as well as those in other papers,the luminous efficiency of LDPE film was calculated to be 5.9×10^-6,and the charges＇ recombination rate during first 0.2 second at the beginning stage of short-circuit is around 2.8%.