| Electrical Capacitance Tomography |
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Although capacitance sensing methods were in widespread use the idea of using capacitance measuremnet to form images is attributed to Maurice Beck and co-workers at UMIST in the 1980s . Although usually called Tomography , the technique differs from conventional tomographic methods, in which high resolution images are formed of slices of a material. The measurement electrodes, which are metalic plates, must be sufficiently large to give a measureable change in capactiance. This measns that very few electrodes are used and eight or twelve electrodes is common. An N-eleectrode system can only provide N(N-1)/2 independent measurements. This means that the technique is limited to producing very low resolution images of approximate slices. However, ECT is fast, and relatively inexpensive. REFERENCES
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