Title :
Design of sensor electronics for electrical capacitance tomography
Author :
Huang, S.M. ; Xie, C.G. ; Thorn, R. ; Snowden, D. ; Beck, M.S.
Author_Institution :
Dept. of Electr. Eng. & Electron., Univ. of Manchester Inst. of Sci. & Technol., UK
fDate :
2/1/1992 12:00:00 AM
Abstract :
The design of the sensor electronics for a tomographic imaging system based on electrical capacitance sensors is described. The performance of the sensor electronics is crucial to the performance of the imaging system. The problems associated with such a measurement process are discussed and solutions to these are described. Test results show that the present design has a resolution of 0.3 femtofarad. (For a 12-electrode system imaging an oil/gas flow, this represents a 2% gas void fraction change at the centre of the pipe) with a low noise level of 0.08 fF (RMS value), a large dynamic range of 76 dB and a data acquisition speed of 6600 measurements per second. This enables sensors with up to 12 electrodes to be used in a system with a maximum imaging rate of 100 frames per second, and thus provides an improved image resolution over the earlier 8-electrode system and an adequate electrode area to give sufficient measurement sensitivity
Keywords :
computerised tomography; electric impedance imaging; electric sensing devices; image sensors; 0.3 fF; data acquisition speed; dynamic range; electrical capacitance sensors; electrical capacitance tomography; gas flow; gas void fraction change; imaging rate; measurement sensitivity; noise level; oil flow; sensor electronics; tomographic imaging system;
Journal_Title :
Circuits, Devices and Systems, IEE Proceedings G
