The Effects of Excitation Signal on the Resolution of the Liquid Crystal Capacitive Chemical and Biological Sensors

In this paper excitation characteristics of the Liquid Crystal (LC) capacitive chemical and biological sensor are examined and the optimum frequency and voltage range for the sensor interface areintroduced. Interdigitated capacitor has been used for the sensor capacitance measurement and twodifferent molecular orientations, homeotropic and homogenous, have been considered. The LC sensor capacitance has been measured for different frequencies from 20Hz to 2MHz and voltages from 0.5V to 20V. In both cases, the effects of excitation on the capacitance value and the accuracy of themeasurement are investigated. Simulation and experimental results support the proposed range of measurement.

کلیدواژه ها:

Liquid Crystal Capacitive Sensor ، Liquid Crystal Excitation ، Interdigitated Capacitor ،