A high-performance EIT system

An Image Reconstruction Algorithm for Electrical Impedance Tomography Using Adaptive Group Sparsity Constraint

“…LECTRICAL Impedance Tomography (EIT) is a tomographic imaging modality to non-intrusively reveal the conductivity distribution in either the 2D or 3D sensing domain through boundary current injection and induced voltage measurements [1,2]. In recent decades, this technique has been extensively exploited in industrial process imaging [3][4][5] and biomedical imaging [6], owing to its high-speed, non-radiation, and non-intrusive sensing ability.…”

“…In recent decades, this technique has been extensively exploited in industrial process imaging [3][4][5] and biomedical imaging [6], owing to its high-speed, non-radiation, and non-intrusive sensing ability. Compared with other tomography modalities, e.g., CT, the application scope of EIT has been promoted by its high temporal resolution, e.g., ~1000 frames per second [1], but limited by the low spatial resolution, e.g., ~10% of the sensor diameter [7]. Aside of the research aspects of advanced instrumentation [1,8], sensor optimization and sensing strategies [9,10], the development of image reconstruction algorithms capable of generating high quality tomographic images has especially been deemed a critical challenge for the realization of quantitative and high spatial resolution EIT imaging.…”

Evaluation of EIT systems and algorithms for handling full void fraction range in two-phase flow measurement

“…A comparison study between the Leeds FICA EIT system [6] and the Wire-mesh sensor (WMS) [7] was conducted to validate the accuracy of EIT measurement for air void fraction in air-water two phase upwards flows [8]. The image reconstruction algorithm used was Modified Sensitivity Back-Projection (MSBP).…”

Oil volume fraction and velocity profiles in vertical, bubbly oil-in-water flows

“…However the principal previous work in this field includes that which has been carried out by; (i) Vigneaux et al [5] who measured local oil volume fraction distributions, in vertical and inclined oil water flows in a 200mm diameter pipe, using a high frequency impedance probe; (ii) Bruun's group [6] and [7] who investigated optical and hot-wire probes as a means of measuring the local properties of vertical oil-water flows; (iii) Zhao et al [8] who measured local oil volume fraction profiles, interfacial velocity profiles, interfacial area concentration profiles and oil drop diameters in a vertical 40mm diameter tube using a double-sensor conductivity probe; and (iv) Lum et al [9] who used high speed video filming and impedance probes to measure phase distributions in oil-water flows inclined at small angles (less than o 10 ) to the horizontal in a 38mm diameter pipe. More recently, Wang et al [10] have attempted to use dual-plane ERT to measure local oil volume fraction and velocity profiles in vertical oil-in-water flows in an 80mm diameter pipe. One of the main aims of the current paper is to provide reference data against which Wang's ERT results can be compared.…”