Abstract
This paper presents EIT-based fabric sensors that aim to provide a pressure mapping using the current carrying and voltage sensing electrodes attached to the boundary of the fabric patch. Pressure-induced shape change over the sensor area makes a change in the conductivity distribution which can be conveyed to the change of boundary current-voltage data. This boundary data is obtained through electrode measurements in EIT system. The corresponding inverse problem is to reconstruct the pressure and deformation map from the relationship between the applied current and the measured voltage on the fabric boundary. Taking advantage of EIT in providing dynamical images of conductivity changes due to pressure induced shape change, the pressure map can be estimated. In this paper, the EIT-based fabric sensor was presented for circular and rectangular sensor geometry. A stretch sensitive fabric was used in circular sensor with 16 electrodes and a pressure sensitive fabric was used in a rectangular sensor with 32 electrodes. A preliminary human test was carried out with the rectangular sensor for foot pressure mapping showing promising results.
Highlights
Electrical impedance tomography (EIT) is a fast and costeffective technique to provide tomographic conductivity image of a subject from boundary current-voltage data
EIT system displays the image of the conductivity changes from current-voltage data measured at the boundary of fabric patch
The main objective of this study is to show the capability and limitation of the current generation of pressure mapping EIT system and methods
Summary
Electrical impedance tomography (EIT) is a fast and costeffective technique to provide tomographic conductivity image of a subject from boundary current-voltage data. Time difference EIT technique can be used to image conductivity changes in a fabric sensor [1]. Pressure induced shape changes over the sensor area make changes to the conductivity distribution; the change in conductivity distribution leads to the change in current-voltage data in EIT system. EIT system displays the image of the conductivity changes from current-voltage data measured at the boundary of fabric patch. EIT as a pressure mapping imaging method is very new. The main objective of this study is to show the capability and limitation of the current generation of pressure mapping EIT system and methods. The scientific challenges related to the fabric EIT have been highlighted
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