Switch Configuration Effect on Stray Capacitance in Electrical Capacitance Volume Tomography Hardware

Abstract: Electrical capacitance volume tomography (ECVT) system uses six switches in one channel with configuration resembling “T” letter, so it is called “T-switch”. The working scheme of the switch can beexplained in four different modes of operation, i.e. excitation mode, detection mode, ground mode, andfloating mode. This research describes the effect of switch configuration to stray capacitance in ECVThardware. Stray capacitance introduces parasitic signal from other sources; one of them is signal fromanother electrode at floating mode when the signal is still flowing to detection circuit. One channel, twochannels, three channels, so on until thirty-two channels are connected to single detection circuitsequentially to investigate the effect of stray capacitance. Both simulation and experiment show the stray capacitance increases along with addition of channel corresponds to 0.046pF for each channel.
Keywords: Stray capacitance, T-switch, ECVT, C-V circuit
Author: Arba’i Yusuf
Journal Code: jptkomputergg160278

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