Switch Configuration Effect on Stray Capacitance in Electrical Capacitance Volume Tomography Hardware

Yusuf, Arbai; S, Harry Sudibyo; Sudiana, Dodi; Tamsir, Agus Santoso; Muttakin, Imamul; Widada, Wahyu; Taruno, Warsito P.

doi:10.12928/telkomnika.v14i2.3328

Cited by 5 publications

(2 citation statements)

References 15 publications

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“…The use of electromagnetic relays for electrode switching instead of analog switches is the primary difference between this ECT measuring system and the standard ECT system. The reason for this is that it has been found experimentally that the off-capacitance of the analog switches is very large (several pF-tens of pF) [23], and for a 16-electrode ECT, at least 16 analog switches are required, and the total analog switching circuit forms a stray capacitance of hundreds of pF. When disconnected from the circuit, one opposite electrode pair of the ECT sensor has a capacitance of approximately 0.3 pF; however, when connected to the analog switching circuit, this value would boost to hundreds of pF.…”

Section: Ect Sensor and Measurement Systemmentioning

confidence: 99%

A pilot study on intracerebral hemorrhage imaging based on electrical capacitance tomography

Zhuang

Wang

et al. 2023

Front. Phys.

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Introduction: Intracerebral hemorrhage (ICH) is a devastating disease with high rates of mortality and disability. The survival rate and postoperative outcome of ICH can be greatly improved through prompt diagnosis and treatment. CT and MRI are now the gold standards for the diagnosis of ICH, but they are not practical for use in pre-hospital emergencies or at the bedside monitoring.Methods: Based on the earlier research of ICH detection with a single parallel plate electrode sensor, we developed a 16-electrode Electrical Capacitance Tomography (ECT) system for two-dimensional tomographic imaging of ICH in this study. A 5-layer spherical numerical model and an ex vivo porcine physical model of ICH were created for ECT simulation imaging and actual imaging, respectively, to assess the feasibility of this ECT for ICH imaging.Results: The bleeding circles were easily seen in the image reconstruction in numerical imaging. In ex vivo imaging, the existence of bleeding was also more clearly shown with the ECT system; however, the position of the bleeding reconstructed in the image was offset by 3 mm from the real site.Discussion: The study analyzes the causes of this discrepancy and discusses the steps that may be taken to rectify it. Overall, the simulation and ex vivo experimental trials validated the potential of ICH imaging with the ECT method; however, further work is required to increase the performance of the ECT and a more advanced imaging reconstruction algorithm is urgently needed for ICH imaging.

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Section: Ect Sensor and Measurement Systemmentioning

confidence: 99%

A pilot study on intracerebral hemorrhage imaging based on electrical capacitance tomography

Zhuang

Wang

et al. 2023

Front. Phys.

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“…Setiap elektroda dilengkapi dengan 6 buah switch CMOS dengan pembagian 3 switch untuk masing-masing fungsi elektroda. Switch disusun dalam topologi T untuk mengurangi kebocoran muatan saat switch dalam keadaan non aktif [12].…”

Section: Multiplekser Analogunclassified

Rancang Bangun Tomografi Kapasitansi Listrik dengan Sensor Tersegmentasi dan Berperisai untuk Deteksi Benda Dalam Pipa

Wardhana

Rivai

Budiman

et al. 2017

JTITS

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Abstrak-Tomografi merupakan teknik pengamatan struktur penampang benda tanpa melakukan tindakan yang bersifat merusak atau mengubah benda yang dibutuhkan dalam penerapan industri, kesehatan maupun keamanan. Pengamatan dilakukan dengan memanfaatkan interaksi bahan dalam benda terhadap sinyal eksitasi eksternal. Hasil pengukuran digunakan untuk merekonstruksi struktur penampang internal benda. Pada penelitian ini dilakukan perancangan sistem tomografi kapasitansi listrik dengan menggunakan sensor tersegmentasi dan berperisai. Tomografi kapasitansi listrik memanfaatkan informasi perbedaan nilai kapasitansi pada beberapa garis potong yang disebabkan oleh persebaran permittivitas bahan untuk merekonstruksi struktur bagian dalam benda. Konfigurasi sensor diatur dengan menggunakan multiplekser analog yang terdiri dari array switch CMOS HEF4066B. Pengukuran kapasitansi sensor dilakukan dengan metode pengukuran muatan. Sinyal hasil pengukuran dikondisikan dengan menggunakan filter high-pass, penguat, penyearah presisi dan perata-rata, yang kemudian didigitalkan menggunakan ADC pada mikrokontroller ATmega8A. Pengolahan data dilakukan dengan menggunakan komputer. Rekonstruksi citra dilakukan dengan algoritma proyeksi balik linier. Berdasarkan hasil pengujian, sistem tomografi kapasitansi listrik dapat mendeteksi letak dan membedakan bahan benda uji. Penggunaan sensor tersegmentasi mampu meningkatkan sensitivitas pengukuran kapasitansi sebesar 2,76 kali lipat dari penggunaan sensor tunggal dengan nilai sensitivitas 0,515 V/pF. Penggunaan sensor berperisai mampu mengurangi efek gangguan lingkungan terhadap pengukuran sensor. Hasil dari penelitian ini dapat diimplementasikan sebagai alat pemonitor isi pipa pada industri dengan kebutuhan regulasi yang rendah. Kata Kunci-proyeksi balik linier; sensor tersegmentasi; tomografi kapasitansi listrik

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Determine of the Time Constant of Capacitance Applied to Electrical Capacitance Tomography

Yusuf¹,

Widada

Taruno³

2022

2022 International Conference on Informatics Electrical and Electronics (ICIEE)

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Switch Configuration Effect on Stray Capacitance in Electrical Capacitance Volume Tomography Hardware

Abstract: Electrical capacitance volume tomography (ECVT)

Cited by 5 publications

References 15 publications

A pilot study on intracerebral hemorrhage imaging based on electrical capacitance tomography

A pilot study on intracerebral hemorrhage imaging based on electrical capacitance tomography

Rancang Bangun Tomografi Kapasitansi Listrik dengan Sensor Tersegmentasi dan Berperisai untuk Deteksi Benda Dalam Pipa

Determine of the Time Constant of Capacitance Applied to Electrical Capacitance Tomography

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