Study of precision constant current sources with resistor load and a cole-cole load for multi-frequency in electrical impedance tomography

Puspitasari, Ayu Jati; Endarko, Endarko

doi:10.1109/issimm.2016.7803713

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…The analysis of the literature and technical documentation showed the existence of two basic types of circuit configurations that work with floating or grounded load. In previous works, [5][6][7][8][9][10][11][12][13][14] different circuits of voltage-to-current converters with grounded load are presented, in which various useful structural modifications and frequency compensations with external passive components are proposed for improving the stability in a given frequency range, as well as increasing the value of the output resistance. Moreover, the majority of the electronic circuits [3][4][5][6][8][9][10][11][12]14 are based on the Improved Howland Current Pump, which uses one op-amp and five (or six) resistors.…”

Section: Introductionmentioning

confidence: 99%

Stability analysis and design of floating load voltage‐controlled current sources

Пандиев

2022

Circuit Theory & Apps

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This paper presents the structure and techniques for frequency compensation of the floating load voltage‐controlled current sources employing power operational amplifiers (op‐amps), as active building blocks. Based on the performed theoretical analysis, conditions for self‐oscillation are determined, and an approach for introducing frequency compensation in a predetermined bandwidth is proposed. The obtained analytical expressions, as well as some additional conditions, are the basis of the proposed design procedure. The practical applicability of the proposed procedure has been tested by designing and analyzing sample electronic circuits of floating load voltage‐to‐current converters.

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Section: Introductionmentioning

confidence: 99%

Stability analysis and design of floating load voltage‐controlled current sources

Пандиев

2022

Circuit Theory & Apps

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“…Electrical Impedance Tomography (EIT) is an imaging technique and radiation-free that uses electrical signals to reconstruct an image from the human body's conductivity distribution information. EIT is a promising technique that has been used in various fields such as industry, geophysics, and medical application [1][2][3][4][5][6][7][8]. This imaging technique is an imaging technique that has advantages compared to other imaging techniques.…”

Section: Introductionmentioning

confidence: 99%

Design of low-cost and simple reconstruction method for Three Dimensional Electrical Impedance Tomography (3D-EIT) Imaging

Endarko

Umbu

2020

J. Penelit. Fis. Apl.

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Electrical impedance tomography is a non-invasive imaging modality that uses the electrical conductivity distribution to reconstruct images based on potential measurements from the object's surface. The proposed study was to design and fabricate a low-cost and simple reconstruction method for 3D electrical impedance tomography imaging. In this study, we have been successfully developed 3 Dimensional Electrical Impedance Tomography (3D-EIT) system using 16 copper electrodes (Cu) to detect and reconstruct the presence of objects in the Phantom. 3D-EIT was developed using Phantom as a test object with PVC pipe material, with an inner diameter of 7.2 cm and a height of 5.4 cm. Electrodes were arranged in two rings, with each ring having eight electrodes arranged in a planar line. Furthermore, the Gauss-Newton algorithm and Laplace prior regularization were used to image reconstruction of objects inside the Phantom using voltage measurement produced from sequential pairs of neighboring electrodes. The voltage is obtained from the injection of a constant current of 1 mA at 20 kHz into the system's electrode pairs. The objects used in this research are PVC pipe, solid aluminum, PVC pipes filled with wax glue, and copper trusses. The results obtained show that the reconstruction results can provide information about the position, the electrical properties, and the shape of real objects. Finally, the system can detect the location, height, and electrical properties of objects for all variations of angle and height variations.

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“…The influence of current frequency tends to affect the capability of current can pass through the medium. In study of cola cole load, it said that low frequency had a lower capability to pass the medium than high frequency [6].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Multi-frequency Current Injection in Image Reconstruction for Two-Dimensional High-Speed Electrical Impedance Tomography (EIT)

Widodo¹,

Rubiyanto²,

Endarko³

2019

IJOE

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The image reconstruction for two-dimensional high-speed Electrical Impedance Tomography (EIT) has been successfully studied with multi-frequency current injection. The aim of this study is to get the best image reconstruction under the influence of multi-frequency current injection of this EIT system. In this method, we used current injection at 1 mA with varies of frequency in the range 10 to 50 kHz injected at the practical phantoms with 16 electrodes. Polyvinyl chloride (PVC) cylinder was put in the practical phantom as the anomaly. Then, The boundary voltage of the practical phantom was measured by the voltage measurement circuit. After that, it processed in the computer with Gauss-Newton Algorithm to got image reconstruction. The result showed that the best image reconstruction was achieved at 10 kHz of frequency current injection. The best image reconstruction had more accuracy of shape, position and electrical properties of an anomaly in boundary phantom than another image reconstruction result.

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Study of precision constant current sources with resistor load and a cole-cole load for multi-frequency in electrical impedance tomography

Cited by 5 publications

References 11 publications

Stability analysis and design of floating load voltage‐controlled current sources

Stability analysis and design of floating load voltage‐controlled current sources

Design of low-cost and simple reconstruction method for Three Dimensional Electrical Impedance Tomography (3D-EIT) Imaging

The Influence of Multi-frequency Current Injection in Image Reconstruction for Two-Dimensional High-Speed Electrical Impedance Tomography (EIT)

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