TY - JOUR ID - 72197 TI - The Effects of Excitation Signal on the Resolution of the Liquid Crystal Capacitive Chemical and Biological Sensors JO - International Journal of Engineering JA - IJE LA - en SN - 1025-2495 AU - Hassanzadeh, Alireza AU - Zou, Yang AU - Lindquist, Robert AD - ECE Department, Shahid Beheshti University AD - ECE Department, University of Alabama in Huntsville AD - ECE Department, The University of Alabama in Huntsville Y1 - 2013 PY - 2013 VL - 26 IS - 11 SP - 1275 EP - 1280 KW - Liquid Crystal Capacitive Sensor KW - Liquid Crystal excitation KW - Interdigitated Capacitor DO - N2 - 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 are introduced. Interdigitated capacitor has been used for the sensor capacitance measurement and two different 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 the measurement are investigated. Simulation and experimental results support the proposed range of measurement. UR - https://www.ije.ir/article_72197.html L1 - https://www.ije.ir/article_72197_4f07f6bc530914417fff575561ec306d.pdf ER -