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Open AccessArticle

A Simultaneous and Continuous Excitation Method for High-Speed Electrical Impedance Tomography with Reduced Transients and Noise Sensitivity

1
Private Practice, Jouquetti, 05400 Furmeyer, France
2
Department of Electrical Engineering, IT and Cybernetics, Faculty of Technology, Natural Sciences and Maritime Sciences, University College of Southeast Norway, 3901 Porsgrunn, Norway
*
Author to whom correspondence should be addressed.
Sensors 2018, 18(4), 1013; https://doi.org/10.3390/s18041013
Received: 22 February 2018 / Revised: 25 March 2018 / Accepted: 26 March 2018 / Published: 28 March 2018
(This article belongs to the Section State-of-the-Art Sensors Technologies)
This paper presents a concept for soft field tomographic scan of all the projections of electromagnetic waves emanating from an array of electrodes. Instead of the sequential excitation of all pairs of electrodes in the list of all projections, the new method present here consists of a single and continuous excitation. This excitation signal is the linear combination of the excitation signals in the projection set at different AC frequencies. The response to a given projection is discriminated by selecting the corresponding AC frequency component in the signal spectra of the digitally demodulated signals. The main advantage of this method is the suppression of transients after each projection, which is particularly problematic in electrical impedance tomography due to contact impedance phenomena and skin effect. The second benefit over the sequential scan method is the increased number of samples for each measurement for reduced noise sensitivity with digital demodulation. The third benefit is the increased temporal resolution in high-speed applications. The main drawback is the increased number of signal sources required (one per electrode). This paper focuses on electrical impedance tomography, based on earlier work by the authors. An experimental proof-of-concept using a simple 4-electrodes electrical impedance tomographic system is presented using simulations and laboratory data. The method presented here may be extended to other modalities (ultrasonic, microwave, optical, etc.). View Full-Text
Keywords: electrical impedance tomography (EIT); high-speed; noise sensitivity; ONe Excitation for Simultaneous High-speed Operation Tomography (ONE-SHOT); projections; simultaneous excitation of electrodes; tomography electrical impedance tomography (EIT); high-speed; noise sensitivity; ONe Excitation for Simultaneous High-speed Operation Tomography (ONE-SHOT); projections; simultaneous excitation of electrodes; tomography
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MDPI and ACS Style

Dupré, A.; Mylvaganam, S. A Simultaneous and Continuous Excitation Method for High-Speed Electrical Impedance Tomography with Reduced Transients and Noise Sensitivity. Sensors 2018, 18, 1013.

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