Displacement Current Phase Tomography (DCPT) is a new modality in electrical tomography that enables measuring and imaging multi-phase flows with a water phase using Capacitance sensors for the first time.

Flexible Sensor
around Air-Water
Bubble Column

Conventional capacitance tomography (ECT or ECVT) can only measure or image non-conductive two-phase flow regimes. When either of those phases is conductive or highly polar, the linearity between measured capacitance and volume fraction becomes highly distorted. This inhibits the use of electrical capacitance signals for imaging water-based flows.

DCPT solves this problem by using the same ECT or ECVT sensor to measure the dielectric and loss part of the signal and using the electric-phase signal independently for measuring the volume fraction of water. An attractive feature of DCPT is that the relationship between the measured phase and the loss factor inside the sensor domain has a more extended linear range than the relationship between the measured capacitance in ECT or ECVT and the permittivity distribution. DCPT also extends into the 3-D imaging of water-based flows forming volume tomography images.

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