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A high-performance EIT system

Wang, Mi, Ma, Yixin, Holliday, N., Dai, Yunfeng, Williams, R.A. and Lucas, Gary (2005) A high-performance EIT system. IEEE Sensors Journal, 5 (2). pp. 289-299. ISSN 1530-437X

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Abstract

This paper presents the development of a new electrical impedance tomography system for online measurement of two-phase flows with axial velocities up to 10 ms/sup -1/. The system is designed in a modular fashion and can consist of several data acquisition modules and computing modules. The data acquisition module includes a voltage controlled current source with a direct-current-restoration circuit, an equal-width pulse synthesizer unit and a synchronized digital demodulation unit. A new concept of current switching scheme is developed to enhance the ac coupling speed. The computing module includes a digital signal processor (TMS320C6202/6713) with memory, multichannel buffered serial ports and an IEEE1394 communication interface. Several DSP modules can be pipelined for a series of tasks ranging from measurement control to image reconstruction to flow velocity implementation. The performances have been tested and some trial results are reported. A data acquisition speed of 1164 dual-frames (2.383 million data points) per second has been achieved with a root mean square error less than 0.6% at 80 kHz in static test application. An application in the measurement of vertical oil-in-water pipe flow is reported.

Item Type: Article
Subjects: T Technology > T Technology (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Schools: School of Computing and Engineering
School of Computing and Engineering > Systems Engineering Research Group
School of Computing and Engineering > High Performance Computing Research Group
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Depositing User: Briony Heyhoe
Date Deposited: 31 Jul 2008 15:55
Last Modified: 16 Dec 2010 09:41
URI: http://eprints.hud.ac.uk/id/eprint/1313

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