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Two means can be used to improve the data acquisition rate of the electrical capacitance tomography (ECT) system with a fixed excitation frequency, i.e., improving the capacitance measurement speed or changing the capacitance measurement mode from serial to parallel. This paper presents a newly developed high-speed ECT system by combing digital recursive demodulation and parallel-mode capacitance...
In this paper, a digital demodulation method used for AC-based electrical tomography systems is presented. The demodulation result can be easily obtained by rectifying the sinusoidal measurement signal in a digital way. The proposed demodulation method has some distinguished characteristics: (a) with a concise configuration, it can be implemented on simple digital signal processors without hardware...
In this paper, a new digital demodulation method was proposed for capacitance measurement in AC-based electrical capacitance tomography (ECT) systems. The proposed demodulation method can be carried out in the following steps: (1) measure the phase difference between the in-phase reference signal, i.e., the digital form of the excitation signal, and the digitalized measurement signal by using the...
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