Research for Performance Test System of Liquid Crystal Material Based on DSP
GAO Meng,SHI Yanhui,WAN Jing (Department of Electrical Enginerring, Shijiazhuang Railway Institute, Shijiazhang Hebei 050043,China)
This paper introduces a DSPbased dynamic liquid crystal performance test system, by which we can realize the realtime dynamic test for impedance parameter for liquid crystal material. And it describes in detail the design of hardware and software. The integral period sampling, which is realized by realtime frequency calculation and voltage capture function of IC chip, is necessary for precise digital signal processing. The error caused by temperature drift and noise was eliminated by applying DFT in the calculations of the phase difference and voltage amplitude and current amplitude.
【CateGory Index】： TN104.3;TP274.4