Measurement method for transitional dielectric constant of ferroelectric liquid crystal filled and aligned in a sandwich cell

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Abstract
A system for measuring the transitional dielectric constant of a ferroelectric liquid‐crystal (FLC) medium aligned in a sandwich cell has been developed. The system developed in this work is shown to be capable of detecting the average molecular motion of the FLC during the course of the switching in terms of the measurement of the dielectric constant in the soft mode at 40 kHz by applying a triangular‐voltage wave form ranging from 0.1 to 100 Hz to induce the Goldstone mode. This method is more accurate compared to the conventional method based on the observation of the switching current, since the latter usually accompanies the disturbances originating from ionic current, the charge/discharge as a capacitor, and electrical noise.