3D Tomogram Using On-Chip ECT with AC-Based Capacitance Measuring System

Hor, Xian Feng; Leow, Pei Ling; Ali, Mohamed Sultan Mohamed; Gooi, Wen Pin; Din, Shahrulnizahani Mohammad

doi:10.1007/978-981-19-3923-5_62

Cited by 1 publication

(5 citation statements)

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“…The development of on-chip ECT further enrich the lab-on-chip application in handling the samples on a micro-platform by providing the three-dimensional imaging. The samples could be flowing fluids [15] or cell culture [21], which present permittivity difference from the background. For the future work, advanced image reconstruction algorithms can be applied to further study the potential and limit of the suggested electrode configuration.…”

Section: Discussionmentioning

confidence: 99%

“…The data acquisition system was developed based on the AC-based measuring method proposed by [6], in which the output voltage is directly proportional to the measured capacitance. The details in developing the data acqusition system for this work is included in [21]. The result of taking measurement across different frequencis of 100 Hz, 120 Hz, 1 kHz, 10 kHz, and 100 kHz with the Keysight Agilent U1733C LCR meter is plotted in figure 13.…”

Section: Experimental Studymentioning

confidence: 99%

“…Referring figures 13, 10 kHz was the measuring frequency because the imaging samples of Saccharomyces Cerevisiae show the most capacitve characteristic of −54°phase angle at 10 kHz. Whereas, the measuring range was up to 10 nF with some tolerance, as the capacitance of an adjacent electrode pair was 934 pF at 10 kHz when the PDMS microchamber was fully filled with the imaging samples [21]. The capacitance was in pF order as the planar electrodes were uncoated with any insulating layer of PDMS or glass.…”

Section: Experimental Studymentioning

confidence: 99%

“…The capacitance would decrease down to fF order if the electrodes were coated with an insulating layer. The relative error of the data acquisition system was 6% for capacitance value higher 10 pF with the maximum standard deviation of 7.37 pF [21]. The collected capacitance signals were transferred by the data acquisition system to the computer for image reconstruction via an universal serial bus (USB) cable.…”

Section: Experimental Studymentioning

confidence: 99%

“…For instance, by taking the electrical signal before the drug test as the reference point, the subsequent changes of electrical signal can be profiling for the monitoring of drug test [16]. Thus, the idea of using two sensing planes was presented by [21] to achive the three-dimensional imaging of Saccharomyces Cerevisiae cells that were encapsulated within an agar gel. The two sensing planes were attached to the top and bottom of the sensing region of microchamber.…”

Section: Introductionmentioning

confidence: 99%

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Electrode configuration study for three-dimensional imaging of on-chip ECT

et al. 2023

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Conventional electrical capacitance tomography (ECT) is widely used for monitoring the fluids flow in a pipeline. As the emergence of microfluidics, the tomography system has been miniaturized and integrated into the microfludic platform for imaging purposes. The on-chip ECT is designed to monitor the permittivity distribution of the micro-platform by integrating the planar electrodes with the sensing region. However, limited research has been reported on the electrode design of on-chip ECT, especially for three-dimensional imaging. Thus, this study investigated the electrode design of an on-chip ECT that is capable for image reconstruction in three-dimensions. Four different electrode configurations with different numbers of electrode and arrangements are investigated by simulation to determine the appropriate configuration for three-dimensional imaging. The electrode dimension is optimized based on the sensitivity distribution using the sensitivity variation parameter (SVP). The simulation results shows that the electrode configuration with dual sensing planes enable three-dimensional imaging. The central electrode of each sensing plane is crucial for restoring a floating object. In experiment, the imaging object that was positioned at different vertical and horizontal locations was reconstructed successfully with an average correlation coefficient of 0.4370 using linear back projection (LBP) algorithm. This work has disclosed the appropriate electrode configuration for the three-dimensional imaging of an on-chip ECT system.

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Section: Discussionmentioning

confidence: 99%

Section: Experimental Studymentioning

confidence: 99%

Section: Experimental Studymentioning

confidence: 99%

Section: Experimental Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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