The Use Of Eit Techniques To Measure Interface Pressure

Knight, R.A.; Lipczynski, R.T.

doi:10.1109/iembs.1990.692299

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…This is because EIT is a non invasive and non-ionizing method, different from other medical imaging techniques. Other applications include damage detection [ 3 ] and pressure sore prevention [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

A Quantitative Evaluation of Drive Pattern Selection for Optimizing EIT-Based Stretchable Sensors

Russo

Nefti‐Meziani

Carbonaro

et al. 2017

Sensors

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Electrical Impedance Tomography (EIT) is a medical imaging technique that has been recently used to realize stretchable pressure sensors. In this method, voltage measurements are taken at electrodes placed at the boundary of the sensor and are used to reconstruct an image of the applied touch pressure points. The drawback with EIT-based sensors, however, is their low spatial resolution due to the ill-posed nature of the EIT reconstruction. In this paper, we show our performance evaluation of different EIT drive patterns, specifically strategies for electrode selection when performing current injection and voltage measurements. We compare voltage data with Signal-to-Noise Ratio (SNR) and Boundary Voltage Changes (BVC), and study image quality with Size Error (SE), Position Error (PE) and Ringing (RNG) parameters, in the case of one-point and two-point simultaneous contact locations. The study shows that, in order to improve the performance of EIT based sensors, the electrode selection strategies should dynamically change correspondingly to the location of the input stimuli. In fact, the selection of one drive pattern over another can improve the target size detection and position accuracy up to 4.7% and 18%, respectively.

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Section: Introductionmentioning

confidence: 99%

A Quantitative Evaluation of Drive Pattern Selection for Optimizing EIT-Based Stretchable Sensors

Russo

Nefti‐Meziani

Carbonaro

et al. 2017

Sensors

View full text Add to dashboard Cite

show abstract

“…The main advantage of such EIT systems is the possibility to achieve a stretchable sensor without internal wires, which can be easily mounted over 3D and deformable surfaces showing multi-touch sensing capabilities [2]. In literature, some other EIT applications are for damage detection [3] and pressure sore prevention [4].…”

Section: Introductionmentioning

confidence: 99%

Towards the Development of an EIT-based Stretchable Sensor for Multi-Touch Industrial Human-Computer Interaction Systems

Russo

Meziani

Gulrez

et al. 2016

Lecture Notes in Computer Science

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“…EIT is mainly used in clinical applications for patient monitoring [3,4]; other applications include damage detection [5] and pressure sore prevention [6]. Recently, EIT has been also employed for showing the internal impedance distribution of conductive fabrics that respond to touch with local changes in conductivity, and was therefore used for developing an artificial skin as a large-area pressure sensor [7].…”

Section: Introductionmentioning

confidence: 99%

Development of a High-Speed Current Injection and Voltage Measurement System for Electrical Impedance Tomography-Based Stretchable Sensors

et al. 2017

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Electrical impedance tomography (EIT) is an imaging method that can be applied over stretchable conductive-fabric materials to realize soft and wearable pressure sensors through current injections and voltage measurements at electrodes placed at the boundary of a conductive medium. 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 0.5 mV. The power consumption can be brought down to 3 mW; 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.

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The Use Of Eit Techniques To Measure Interface Pressure

Cited by 6 publications

References 3 publications

A Quantitative Evaluation of Drive Pattern Selection for Optimizing EIT-Based Stretchable Sensors

A Quantitative Evaluation of Drive Pattern Selection for Optimizing EIT-Based Stretchable Sensors

Towards the Development of an EIT-based Stretchable Sensor for Multi-Touch Industrial Human-Computer Interaction Systems

Development of a High-Speed Current Injection and Voltage Measurement System for Electrical Impedance Tomography-Based Stretchable Sensors

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