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Abstract
We present a method for detecting phase transition in liquid crystal based on the analysis of the second harmonic component of electro-optic response spectra. The effectiveness of the method is shown using the well-known prototype antiferroelectric liquid crystal material, 4-(1-methyl-heptyloxy carbonyl) phenyl 4′-octyloxybiphenyl-4-carboxylate (MHPOBC). In contrast to the usual procedures, the temperatures of the phase transitions are determined in simple way during one experiment, even for phases of low thermal stability.