Bulg. J. Phys. vol.25 no.5-6 (1998), pp. 256-263


Measurement System for Investigation of Dielectrics Using Selective Polarisation Method

H. Ponevski, G. Belev, G. Bojanov, I. Yovchev, D. Tokmakov
Department of Physics, University of Plovdiv, 24 Tzar Assen Street, 4000 Plovdiv, Bulgaria
Abstract. A system is described in which a recently proposed method is utilized. The selective polarization is achieved by means of m-cycle polarization voltage, m = 1,..., 5. The value of this voltage in each cycle is constant and can be adjusted in the range ±30 V. The duration of each cycle is h ≥ 0.32 s. The depolarization current id is converted to a voltage u = -Rid, where R = 106–108 Ω. This voltage is digitized by means of a digital oscilloscope and the digitized data is sent to IBM PC for storage and processing. The first measurements show the existence of the proposed SPD-thermograms and the efficiency of the system.

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