Experimental study of phase sensitive detection technique in ECT system

Abstract

Electrical capacitance tomography (ECT) techniques have been developed to visualize industrial processes with dielectric materials. Phase sensitive demodulation is a key part of ECT system to improve speed and accuracy. Methods of demodulation are demonstrated in this paper, including analogue and digital methods. The problems about applying digital quadrature demodulation in ECT were simulated by SIMULINK. Validation shows that the digital phase sensitive demodulation is complete enough to meet the requirements of ECT system in accuracy and speed.