کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
709441 | 892072 | 2011 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Inside-out electrical capacitance tomography Inside-out electrical capacitance tomography](/preview/png/709441.png)
In this work we demonstrate the construction of an ‘inside-out’ sensor geometry for electrical capacitance tomography (ECT). The inside-out geometry has the electrodes placed around a tube, as usual, but measuring ‘outwards’. The flow between the electrodes and an outer tube is reconstructed; allowing the inside-out sensor to move inside the outer tube. A test sensor was constructed and capacitances were measured using the charge transfer technique. Sensitivity matrices for the inside-out sensor were calculated with a finite element approach and some special issues with the sensitivity matrices are discussed. An adaptation of the Landweber algorithm, which works very well for the inside-out geometry, is presented and a definition of the spatial resolution of an ECT sensor is suggested. Tomograms from a test run of an inside-out sensor are presented and measurements of watercut are compared with images obtained by a camera and a simple direct result based on the capacitance vector.
Figure optionsDownload as PowerPoint slideResearch highlights
► We investigate an ‘inside-out’ sensor geometry for electrical capacitance tomography.
► We calculate the sensitivity matrix for the ‘inside-out’ geometry.
► The consequences of this new geometry, upon reconstruction, are investigated.
► Use of linear backprojection for reconstruction causes artifacts in the tomograms.
► An adaptation of the Landweber algorithm is suggested to handle the artifacts.
Journal: Flow Measurement and Instrumentation - Volume 22, Issue 2, April 2011, Pages 104–109