Q.S. Zhu, MIEEE, C.N. McLeod, C.W. Denyer, F.J. Lidgey, MIEEE and W.R.B. Lionheart EIT Reseaxh Group School of Engineering, Oxford Brookes University, Oxford, OX3 OBP, UK. Abstract A serial data acquisition system architecture and its specifications for continuous impedance imaging are presented. The new system design avoids com lexity and high cast associated with the pade l approach which is normdy taken to obtain high speed in muhi-channel measurements. The scheme involves applications of a video speed A D C device and multiplexers, configured IO scan through a l l the channels simultaneously. Non-uniform over-sampling technique is implemented through precision control of digirishg thing. With the system architectuE. the multiple drive system is capable of achieving 16-bit data acquisition accuracy at a speed of 25 frames per second image production.
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