采用光学参量振荡器(OPO)为激发光源,利用光激放电(PSD)测试技术研究了典型聚合物电介质材料的深陷阱能态。激发光源能够输出波长在210-420 nm范围内连续可调谐的激光,每个光脉冲平均能量为2.3 mJ,脉冲宽度为3-5 ns。实验表明,该光源可以很好地工作于PSD测试系统中,同时测得聚对苯二甲酸乙二醇酯(PET)内存在活化能为4.27 eV的单一深陷阱,而聚丙烯(PP)中存在活化能分别为4.92 eV与5.17 eV的深陷阱。这些数据是表征聚合物电介质材料中陷阱态的基本参数。

Firstly studied the deep trap state of typical polymeric material using optical parametric oscillator (OPO) as an exciting source by the method of photo-stimulated discharge (PSD). The wavelength of output laser is tunable continuously in the range of 210-420 nm and the mean energy of photo-impulse which has a width of 3-5 ns is about 2.3 mJ. The experimental results show that this laser source can be well implemented in the PSD measurement. For example,the activation energy of the polyethylene terephthalate (PET) is 4.27 eV and the activation energy exists on polypropylene (PP) is 4.92 eV and 5.17 eV which all belong to the deep trap. The activation energy is the essential parameter to characterize the polymeric dielectric material which can provide fundamental data and scientific reference for the improvement to enhance the electric properties of the material.