The invention discloses a switching
system for
electrical impedance tomography (EIT). The switching
system comprises a flexible flat cable pin-shaped socket, a D-SUB connector, four
shape memory alloy (SMA) connectors, four groups of decoding circuits, four groups of
electric control switch circuits and a shielding
driving circuit, wherein the shielding
driving circuit is connected with the D-SUB connector through a shielding
signal connecting wire; the input ends of the four groups of
electric control switch circuits are connected with the D-SUB connector through an internal connecting
bus respectively; the input end of each group of decoding circuit is connected with the output end of a group of
electric control switch circuit respectively; the output ends of the four groups of decoding circuits are connected to the same flexible flat cable pin-shaped socket; and each
SMA connector is connected to a group of electric
control switch circuit. The switching
system is ingenious in concept; the switching system of the conventional EIT system forms a subsystem independent from a
data acquisition system, so that an
electrode distribution parameter is reduced; and due to the adoption of novel switches and a shielding driving technology, the whole EIT system has the advantages of high imaging accuracy, high imaging speed, long service life, wide working frequency range and the like.