Patent ID: 7983853

Claim:
An electrical impedance tomography (EIT) data processing system, for acquiring and processing data from two-phase flows, comprising a dual-plane sensor, a plurality of digital signal processing modules configured in a data pipeline processing arrangement and a plurality of data acquisition subsystems in communication with a first one of said plurality of digital signal processing modules; wherein at least one of the data acquisition subsystems includes an over-zero switch comprising: at least one multiplexer and at least one flip-flop; the at least one multiplexer arranged to supply a sinusoidal signal to a selected one of a plurality of channels of the dual-plane sensor according to an output of the at least one flip-flop; the at least one flip-flop arranged to receive a synchronization signal that has the same over-zero point as the sinusoidal signal, the synchronization signal causing the at least one flip-flop to output a channel selection signal.