Planar array of electrical capacitance tomography with rotation

This paper investigates a rotational data collection strategy for planar array electrical capacitance tomography (ECT) to improve the imaging of complex-shaped objects in scenarios where access to the object is limited. Planar array of ECT can produce 2D and 3D images of changes in the dielectric permittivity of the object, but detecting complex-shaped objects may require more electrodes in the array, which can decrease the quality of capacitance measurements and make it challenging to detect objects at greater depths. With the air background as calibration measurements, by rotating the sensor array or the object, more independent data can be obtained, which can enhance image quality compared to traditional planar array ECT. The paper presents experimental results of image enhancement through visual reconstruction of known-shaped dielectric test samples and quantitative analysis against the ground truth. These findings suggest that rotational data collection has the potential to improve image quality in planar array ECT for detecting complex-shaped objects.