TY - JOUR
AU - Liu, Shi
AB - In this paper, a high-precision measurement system for electrical capacitance tomography (ECT) is presented. A low-cost complex programmable logic device (CPLD) is employed to accomplish logic control, signal generation, data acquisition, digital demodulation and communication with the aid of external components. By adopting a simple digital demodulator recently developed by the authors, the demodulation to ac signals becomes rather simple and resource-saving. A double-T-switches configuration is developed to improve the precision and lower the limit of multi-channel capacitance measurement. A capacitance network is constructed for system calibration. A square ECT sensor with 16 electrodes is constructed to test the practical performance of the measurement system. With a data acquisition rate of 185 frame s−1, the signal-to-noise ratio and standard deviation of capacitance measurement can reach up to 70 dB and 0.09 fF, respectively. Image reconstruction experiment has validated the CPLD-based ECT system.
TI - A complex programmable logic device-based high-precision electrical capacitance tomography system
JF - Measurement Science and Technology
DO - 10.1088/0957-0233/24/7/074006
DA - 2013-07-01
UR - https://www.deepdyve.com/lp/iop-publishing/a-complex-programmable-logic-device-based-high-precision-electrical-A10Okm0IKa
SP - 074006
VL - 24
IS - 7
DP - DeepDyve
ER -