Charge behavior observation in LDPE/MgO nanocomposite material under AC high field

Recently, authors have developed the simultaneous observation system which is combined a photomultiplier tube (PMT), a high performance CCD camera and the dissipation current waveform detecting circuit. In this study, the observations of the dissipation current waveform and EL of LDPE/MgO nanocomposite material under AC high field were carried out. LDPE and the concentration of LDPE/MgO nanocomposite were 1 and 5 phr respectively, were prepared. Electric field dependence and time variations of EL pulses were examined by using the system. As the results of these experiments, the incorporation of MgO nanoparticles in LDPE matrix makes elevate the EL inception level and makes increase the number of EL pulses, especially negative half cycle. But there were no dependences of the relaxation time tau at 60 kV/mm 50 Hz with MgO contents under AC field.