In this paper the general principles of capacitance tomography are explained. Recent developments in the design of the primary sensor, the sensor electronics and the reconstruction are shown as well as future trends identified. Industrial and research applications of capacitance tomography are given.

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Tomographic measurement techniques have become increasingly popular for the application in the field of chemical and process engineering. With this techniques, the fields of density, concentration, temperature, velocity or local void fraction can be measured without interfering with the multiphase flow. These fields are often either instationary or even have transient character. Therefore, the used tomographic measurement techniques have to have a high spatial and temporal resolution. In this paper known tomographic measurement systems are described and compared to each other. The sensor systems and reconstruction methods are explained. As an example, the applications of electrical and x-ray tomography are described for the imaging the flow inside random and structured packings. With the electrical tomographic measurement technique a temporal resolution of up to 100 frames per second is achieved, whereas with the x-ray tomography spatial resolutions of 0.4mm are possible.

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