PROJECT TITLE :

A New Dual-Modality ECT/ERT Technique Based on C4D Principle

ABSTRACT:

Based on the measurement principle of capacitively coupled contactless conductivity detection, a brand new twin-modality electrical capacitance tomography (ECT)/electrical resistance tomography (ERT) technique is proposed, and hence, a new integrated twin-modality ECT/ERT system is developed. 1st, with the digital section-sensitive demodulation technique, the capacitance and resistance measurements of the fluid are obtained simultaneously. Then, a modality recognition method, which is on the premise of the -nearest neighbor algorithm, is proposed to automatically implement the modality switching between two totally different modalities (ECT modality and ERT modality). Finally, with the modality recognition result, ECT or ERT modality is chosen to reconstruct the cross-sectional image of the permittivity or the conductivity distribution of the fluid. Static experiments and dynamic experiments were dispensed. Experimental results demonstrate the feasibility of the proposed dual-modality ECT/ERT technique and the effectiveness of the developed dual-modality ECT/ERT system. The research results conjointly indicate that the proposed modality recognition method is effective and will determine the proper modality. The qualities of the reconstructed images in ECT modality or ERT modality are satisfactory.