Inside-out electrical capacitance tomography

Kjærsgaard-Rasmussen, Jimmy; Meyer, Knud Erik

doi:10.1016/j.flowmeasinst.2010.12.007

Cited by 5 publications

(4 citation statements)

References 12 publications

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“…Dry sand with permittivity value of 3 is used as high permittivity calibration, and air is used as low permittivity calibration. At the same time, we use (16) to compare the two methods. Normalized permittivity distributions of the true images are shown in figures 13(b) and 14(b).…”

Section: Experimental and Simulation Resultsmentioning

confidence: 99%

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Image reconstruction for electrical capacitance tomography by using soft-thresholding iterative method with adaptive regulation parameter

Dong

Soleimani

2013

Meas. Sci. Technol.

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Electrical capacitance tomography (ECT) is a promising technology for visualization of permittivity distributions inside a volume. Fast and high spatial resolution algorithm is still a challenging task. In this paper, we present a novel soft-thresholding iterative method for ECT image reconstruction. An adaptive selection of regulation parameter is proposed based on the capacitance error in the Landweber algorithm. Both simulation and experimental results show that the image quality of the new method is comparable to that of the projected Landweber method, and in most test cases, the new method is faster than the projected Landweber method.

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Section: Experimental and Simulation Resultsmentioning

confidence: 99%

“…It is known as image reconstruction. One of the widely used methods for ECT is the Landweber method [15][16][17]. Its objective functional can be expressed as…”

Section: Inverse Modelmentioning

confidence: 99%

Image reconstruction for electrical capacitance tomography by using soft-thresholding iterative method with adaptive regulation parameter

Dong

Soleimani

2013

Meas. Sci. Technol.

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“…operate over much wider flow conditions, with less dependency on flow models. Some level of tomographic (phase-fraction) measurements based on multiview microwave, electrical impedance or electrical capacitance sensing have appeared in surface MPFMs (Scheers & Wee, 2011;Brandt, Tol, & Lars, 2009) and in downhole production logging tools (Xie et al, , 2007Hallundbaek & Kjaersgaard-Rasmussen, 2010;Kjaersgaard-Rasmussen & Meyer, 2011). It is yet to be demonstrated that tomography-based techniques can measure individual phase flow rates more accurately than the existing commercially available MPFMs.…”

Section: Potential Of Tomography In Hydrocarbon Production Monitoringmentioning

confidence: 99%

Applications of tomography in the oil-gas industry – Part 2

Xie¹,

Wilt

2015

Industrial Tomography

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“…LBP has been used in many industrial applications including fluidized bed drying, bubble columns and pneumatic conveying [3,7,11]. The weakness of the LBP method is highlighted when determining shape and boundary location, often providing rounded, inaccurate images of sharp phantoms in the reconstructed tomograms [12][13][14]. Despite recent commercial advances in the use of alternative, more complicated image reconstruction algorithms, LBP remains the most practical solution for real-time acquisition and visualisation of ECT data [14,15] required by potential industrial applications.…”

Section: Measurement Science and Technologymentioning

confidence: 99%

A comparison of methods forin situdiscrimination of imaged phase boundaries using electrical capacitance tomography

Clark

Tsoligkas

Simmons

et al. 2015

Meas. Sci. Technol.

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The detection of hard boundaries using tomographic techniques is challenging due to the measurement resolution inherent in the hardware and smoothing effects created during image reconstruction. This paper is concerned with the development of data processing approaches which enable the use of electrical capacitance tomography (ECT) in real-time applications to visualise interfaces in liquid/liquid and solid/liquid systems based upon phase permittivity differences in media with a high di-electric continuum. The methodologies developed were applied to a series of phantoms to investigate their validity as a tool for imaging phase boundaries in two and three phase systems.In an ECT based tomogram, the interface between phases is exhibited as a transition region; by applying a threshold technique based upon known areas of each respective phase within the system, the transient region can be resolved into a sharp interface. The image error of a tomogram, defined as the deviation of all pixels from their theoretical value, has been calculated using a pixel-by-pixel approach; however this requires exact a priori knowledge and is unsuitable for in-line application; the areal method used in this paper requires global phase distribution information thereby allowing for real-time application. A range of threshold values were applied to tomograms of phantoms of varying geometry and the corresponding image error for each threshold value calculated using both the areal and pixel-by-pixel approaches given above. The threshold value yielding lowest image error from this range is further used in the binary images giving improved tomograms with approximately 40% increase in image accuracy when compared with a default threshold value. Close to the sensor wall, the image becomes distorted due to reconstruction errors arising from decreased density in the electrical field lines, resulting in a circular phantom appearing elongated by approximately 10% when positioned near the wall.

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Inside-out electrical capacitance tomography

Cited by 5 publications

References 12 publications

Image reconstruction for electrical capacitance tomography by using soft-thresholding iterative method with adaptive regulation parameter

Image reconstruction for electrical capacitance tomography by using soft-thresholding iterative method with adaptive regulation parameter

Applications of tomography in the oil-gas industry – Part 2

A comparison of methods forin situdiscrimination of imaged phase boundaries using electrical capacitance tomography

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