Planar Array ECT Sensor Design Optimisation
C. Tholin-Chittenden, M. Soleimani
Engineering Tomography Lab (ETL) Department of Electronic and Electrical Engineering – University of Bath Claverton Down Rd, Bath, North East Somerset BA2 7AY, United Kingdom
Electrical Capacitance Tomography (ECT) can generate permittivity maps of a viewing area and by using a planar array sensor this can be done from only 1 side producing a 3D image. This makes it particularly useful for the application of landmine detection as landmines often have unique electromagnetic properties from their surrounding and can only be accessed from 1 side. This paper builds upon existing work with planar array ECT in order to optimise the sensor array layout. This was done through a process of design optimisation whereby a range of sensors where designed and created then tested to see how they performed against existing sensor layouts and each other. A wide range of analysis and comparisons were made for each sensor including SVD analysis of the Jacobian and capacitance sensitivity testing. Experimental evaluation of the forward model and image reconstruction was performed using individual sensors and also when the data from all sensors combined together. SVD analysis showed that sensor design 4 performed better than existing designs and using a combination of all the sensor designs produced the best reconstructed images. Further work would include manufacturing the combined sensor as a single device with switching between various sensor layouts and also improving the manufacture method to improve the capacitance measurements.
Keywords ECT, Electromagnetics sensing, Permittivity, Planar Array imaging
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