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Vol. 75, Issue 1, January 2007, pp. 896-903




Design of High-Speed Pulse Input Based Capacitance Measurement for Electrical Capacitance Tomography


S. Sathiyamoorthy1, J. Saratchandrababu2


1Dept. of Electronics and Instrumentation Eng., J. J college of Eng. and Tech., Trichy-9

2Dept. of Chemical Eng., NIT, Trichy-15

National Institute of Technology, Tiruchirappalli, India

E-mail: ssathya_me@rediffmail.com, sarat@nitt.edu



Received: 11 December 2006 /   Accepted: 22 January 2007 /   Published: 29 January 2007


Abstract: The High Speed pulse input based capacitance measurement has been designed for electrical capacitance tomography. It has a high resolution with low offset and extremely low gain drift, compared with a charge/discharge and AC based Transducer designed for same purpose. This paper focuses on the development of new sensing methods to measure the capacitance range from femto farad up to 100nfarad. All functions are programmed in an embedded controller (PIC16F874A/877A), which can be easily translated in to the capacitance with noise level to 0.2 % and sensitivity of the measurement up to 0.18-femto farads/micro volt ranges.


Keywords: electrical capacitance tomography, sensor design, capacitance measurement, time-to-digital converter, embedded controller


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