In situ imaging of paste extrusion using electrical impedance tomography

Robert M. West, David M. Scott, Gregg Sunshine, Jacek Kostuch, Lasse Heikkinen, Marko Vauhkonen, Brian S. Hoyle, H. Inaki Schlaberg, Ruozhou Hou, Richard A Williams

Research output: Contribution to journalArticlepeer-review

14 Citations (SciVal)


A case study is presented where electrical impedance tomography is used to
image paste during extrusion. This indicates regions of high moisture at the
wall of the barrel permitting slip and so making extrusion more efficient.
Multi-step Gauss–Newton image reconstruction methods are used.
Techniques include (i) axi-symmetric smoothing that is coupled with
ultrasound measurement to provide discretization information, (ii) full
impedance imaging and (iii) full three-dimensional field modelling. These
provide clear images of the paste that can be used to gauge extrudability of a
paste formulation.
Original languageEnglish
Pages (from-to)1890-1897
Number of pages8
JournalMeasurement Science and Technology
Publication statusPublished - 1 Nov 2002


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