Title :
A compact electrical capacitance tomography system
Author :
Kjærsgaard-Rasmussen, J. ; Yang, W.Q.
Author_Institution :
Dept. of Mech. Eng., Tech. Univ. of Denmark, Copenhagen
Abstract :
Most existing electrical capacitance tomography (ECT) systems are designed using a 19" Eurocase and they are relatively expensive. To reduce the size and cost, a compact ECT system has been developed. It is based on a charge/discharge capacitance measuring circuit and a USB data acquisition (DAQ) unit from NI. It has 6 measurement channels and is housed in a box measuring 158times80times96 mm. The system hardware is operated by a laptop via a USB port. The software is written in LabVIEW and the image reconstruction software in MATLAB. This paper presents the hardware design for the compact ECT system, the calibration procedure, and the image reconstruction from capacitance measurements. The performance of the system has been evaluated and the measurement results are presented. It is concluded that the compact ECT system is capable of providing small capacitance measurements and generating tomograms. The signal-to-noise ratio (SNR) of the measurement system is acceptable and can be improved further.
Keywords :
capacitance; data acquisition; image reconstruction; tomography; LabVIEW; MATLAB; USB data acquisition unit; charge-discharge capacitance measuring circuit; compact ECT system; compact electrical capacitance tomography system; image reconstruction software; signal-to-noise ratio; Capacitance measurement; Charge measurement; Circuits; Costs; Current measurement; Data acquisition; Electrical capacitance tomography; Hardware; Image reconstruction; Universal Serial Bus; Capacitance measurement; Data acquisition; LabVIEW; MATLAB; Tomography;
Conference_Titel :
Imaging Systems and Techniques, 2008. IST 2008. IEEE International Workshop on
Conference_Location :
Crete
Print_ISBN :
978-1-4244-2496-2
Electronic_ISBN :
978-1-4244-2497-9
DOI :
10.1109/IST.2008.4659964
