Development of a high-speed current injection and voltage measurement system for electrical impedance tomography-based stretchable sensors

Russo, S, Nefti-Meziani, S, Carbonaro, N and Tognetti, A 2017, 'Development of a high-speed current injection and voltage measurement system for electrical impedance tomography-based stretchable sensors' , Technologies, 5 (3) , p. 48.

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Abstract

In common EIT systems, the voltage data are serially measured by means of multiplexers, and are hence collected at slightly different times, which affects the real-time performance of the system. They also tend to have complicated hardware, which increases power consumption. In this paper, we present our design of a 16-electrode high-speed EIT system that simultaneously implements constant current injection and differential potential measurements. This leads to a faster, simpler-to-implement and less-noisy technique, when compared with traditional EIT approaches. Our system consists of a Howland current pump with two multiplexers for a constant DC current supply, and a data acquisition card. It guarantees a data collection rate of 78 frames/s. The results from our conductive stretchable fabric sensor show that the system successfully performs voltage data collection with a mean signal-to-noise ratio (SNR) of 55 dB, and a mean absolute deviation (MAD) of 0.5mV. The power consumption can be brought down to 3mW; therefore, it is suitable for battery-powered applications. Finally, pressure contacts over the sensor are properly reconstructed, thereby validating the efficiency of our EIT system for soft and stretchable sensor applications.

Item Type: Article
Schools: Schools > School of Computing, Science and Engineering
Journal or Publication Title: Technologies
Publisher: MDPI AG
ISSN: 2227-7080
Related URLs:
Funders: European Union Seventh Framework Programme FP7/2007-2013/
Depositing User: S Russo
Date Deposited: 29 Aug 2017 11:18
Last Modified: 29 Aug 2017 14:57
URI: http://usir.salford.ac.uk/id/eprint/43615

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