Aspects on Increasing Data Collection Speed of an EIT System

Yixin Ma1 and Mi Wang2

1 Department of Instrument Science and Engineering, School of Electronics, Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P.R. China

2 Institute of Particle Science and Engineering, University of Leeds, LS2 9JT, UK

ABSTRACT

A novel two-plane EIT system has been successfully developed in Leeds University for multi-phase flow measurement. Its fast data collection speed - over 1000 frames/plane per second, the authors believe, is a big step in the history of sine-wave signal based EIT technique. This paper analyses the facts limiting the speed of a conventional EIT system, and then briefly summarise the methods we used to increase data collection speed. Discussion is based on the most widely used EIT data collection mode – adjacent electrode pair protocol. Theoretical and experimental data collection speeds are presented.

Keywords Electrical Impedance Tomography (EIT), Parallel Data Acquisition, Digital Demodulation, Logical Control, Over Zero Switch (OZS)