The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform
Wuqiang Yang - One of the best experts on this subject based on the ideXlab platform.
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investigation of multi plane scheme for compensation of Fringe Effect of electrical resistance tomography sensor
Sensors, 2019Co-Authors: Wenbin Tian, Xiaofeng Liang, Xiaolei Qu, Lijun Xu, Wuqiang YangAbstract:Conventional electrical resistance tomography (ERT) sensors suffer from the Fringe Effect, i.e., severe distortion of the electric field on both ends of the measurement electrodes, leading to a 3D sensing region for a 2D sensor. As a result, the objects outside an ERT sensor plane affect the sensing and hence image, i.e., deteriorating the image quality. To address this issue, a multiple-plane ERT sensor scheme is proposed in this paper. With this scheme, auxiliary sensor planes are used to provide references for the Fringe Effect of the measurement plane, for compensation by subtracting the weighed influence of the Fringe Effect. Simulation results show that the proposed scheme, either three-plane or two-plane sensor, can compensate for the Fringe Effect induced by objects outside the measurement plane with a variety of axial object distributions, i.e., several non-conductive bars or conductive bars placed at different cross-sectional and axial positions inside the sensor. Experiments were carried out. Images obtained with single-plane and multiple-plane ERT sensors are compared, and the proposed compensation scheme has been hence verified.
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Sensor Design for Four-Electrode Electrical Resistance Tomography With Voltage Excitation
IEEE Sensors Journal, 2019Co-Authors: Marco Antonio Rodriguez-frias, Wuqiang YangAbstract:Electrical resistance tomography (ERT) is used to image conductivity distributions. Most existing ERT systems are based on a current-excitation and voltage-detection to measure resistance with the use of small pin electrodes. This measurement technique has several limitations, like the existence of a severe Fringe Effect. This generates image distortion and no quantitative data can be acquired. In addition, the conventional ERT systems are not able to image stratified flows. The ERT systems using voltage-excitation and current-detection (VECD) with large rectangular electrodes were proposed, overcoming the limitations of conventional ERT. The VECD technique can reduce image distortion due to smaller Fringe Effect and allows imaging stratified flows. In the past, the two-electrode sensing technique was used without careful consideration of parasitic resistance, as the contact impedance. This paper presents a design of ERT with voltage excitation with a four-electrode sensor structure to reduce the Effect of the contact impedance, the resistance of the switching stage, and the wiring on the internal resistance measurement. The simulation and experimental results with different conductivity distributions show the superior performance of the proposed structure.
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IST - Compensation for Fringe Effect of electrical resistance tomography sensor by multiple-plane sensor scheme
2018 IEEE International Conference on Imaging Systems and Techniques (IST), 2018Co-Authors: Wenbin Tian, Lijun Xu, Wuqiang YangAbstract:Fringe Effect exists in conventional ERT sensors, i.e., severe distortions of electric field on both ends of sensor electrodes. This leads to a 3D sensing region for a 2D ERT sensor. As a result, the objects outside the ERT sensor plane can still be sensed and imaged, which is undesired and deteriorates the image accuracy. To tackle with this issue, a three-plane ERT sensor scheme is proposed. Simulation results show that the three-plane sensor scheme can compensate for the Fringe Effect induced by the object outside the measurement sensor plane regarding a distribution with three non-conductive bars at different cross-sectional and axial positions. Meanwhile, it is found that for axially uniform distributions, the proposed compensation method can reduce the size overestimation of non-conductive objects to be imaged by linear reconstruction method such as the Landweber iteration. Finally, an experimental ERT system is established to verify the findings from simulation.
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Compensation for Fringe Effect of electrical resistance tomography sensor by multiple-plane sensor scheme
2018 IEEE International Conference on Imaging Systems and Techniques (IST), 2018Co-Authors: Wenbin Tian, Lijun Xu, Wuqiang YangAbstract:Fringe Effect exists in conventional ERT sensors, i.e., severe distortions of electric field on both ends of sensor electrodes. This leads to a 3D sensing region for a 2D ERT sensor. As a result, the objects outside the ERT sensor plane can still be sensed and imaged, which is undesired and deteriorates the image accuracy. To tackle with this issue, a three-plane ERT sensor scheme is proposed. Simulation results show that the three-plane sensor scheme can compensate for the Fringe Effect induced by the object outside the measurement sensor plane regarding a distribution with three non-conductive bars at different cross-sectional and axial positions. Meanwhile, it is found that for axially uniform distributions, the proposed compensation method can reduce the size overestimation of non-conductive objects to be imaged by linear reconstruction method such as the Landweber iteration. Finally, an experimental ERT system is established to verify the findings from simulation.
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Evaluation of Excitation Strategy for a Large-Scale ECT Sensor With Internal–External Electrodes
IEEE Sensors Journal, 2017Co-Authors: Meng Wu, Jiamin Ye, Haigang Wang, Wuqiang YangAbstract:The Fringe Effect of a large-scale electrical capacitance tomography (ECT) sensor is more serious than a small-scale ECT sensor. As a result, the sensitivity in the central region of a large-scale ECT sensor becomes so low that it is difficult to achieve desired image quality in the central region. To improve the image quality with a large-scale ECT sensor, a combination of internal and external electrodes (IEE) is used, and five two-electrode excitation strategies are presented in comparison with the traditional one-electrode excitation strategy. The images reconstructed by a linear backprojection (LBP) algorithm with the six excitation strategies are analyzed and a modified method is proposed to reduce the Effect of noise. The performance of the IEE sensors with the modified LBP and the six excitation strategies is evaluated in terms of the relative error of solids concentration.
Wenbin Tian - One of the best experts on this subject based on the ideXlab platform.
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IST - Effect of stimulation patterns on bladder volume measurement based on Fringe Effect of EIT sensors
2019 IEEE International Conference on Imaging Systems and Techniques (IST), 2019Co-Authors: Xiaofeng Liang, Lijun Xu, Wenbin TianAbstract:Real-time monitoring of bladder volume is necessary for patients with bladder dysfunction. Electrical impedance tomography (EIT) has the potential to be used for bladder volume measurement due to its advantages of noninvasive and real-time sensing. To overcome the sensitiveness of conventional EIT measurement methods to the urine conductivity, Fringe Effect of EIT sensors is explored for bladder volume measurement. In order to find the best stimulation pattern, this paper simulates seven stimulation patterns (using an integer value A as indicator) with a 16-electrodes EIT sensor. Meanwhile, it is investigated how stimulation patterns act with two typical electrodes arrangement, i.e. ring and semicircle. Sensitivity distribution and characteristic values related to the Fringe Effect of EIT sensors are used as evaluation criteria. The results show that when A=2 and the electrodes arrangement is semicircle, the bladder region has the highest mean sensitivity. Using semicircle arrangement ensures that all stimulation patterns except A=6 and 7 have satisfactory measurement sensitivities and less errors under changes of urine conductivity.
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investigation of multi plane scheme for compensation of Fringe Effect of electrical resistance tomography sensor
Sensors, 2019Co-Authors: Wenbin Tian, Xiaofeng Liang, Xiaolei Qu, Lijun Xu, Wuqiang YangAbstract:Conventional electrical resistance tomography (ERT) sensors suffer from the Fringe Effect, i.e., severe distortion of the electric field on both ends of the measurement electrodes, leading to a 3D sensing region for a 2D sensor. As a result, the objects outside an ERT sensor plane affect the sensing and hence image, i.e., deteriorating the image quality. To address this issue, a multiple-plane ERT sensor scheme is proposed in this paper. With this scheme, auxiliary sensor planes are used to provide references for the Fringe Effect of the measurement plane, for compensation by subtracting the weighed influence of the Fringe Effect. Simulation results show that the proposed scheme, either three-plane or two-plane sensor, can compensate for the Fringe Effect induced by objects outside the measurement plane with a variety of axial object distributions, i.e., several non-conductive bars or conductive bars placed at different cross-sectional and axial positions inside the sensor. Experiments were carried out. Images obtained with single-plane and multiple-plane ERT sensors are compared, and the proposed compensation scheme has been hence verified.
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Effect of stimulation patterns on bladder volume measurement based on Fringe Effect of EIT sensors
2019 IEEE International Conference on Imaging Systems and Techniques (IST), 2019Co-Authors: Xiaofeng Liang, Lijun Xu, Wenbin TianAbstract:Real-time monitoring of bladder volume is necessary for patients with bladder dysfunction. Electrical impedance tomography (EIT) has the potential to be used for bladder volume measurement due to its advantages of noninvasive and real-time sensing. To overcome the sensitiveness of conventional EIT measurement methods to the urine conductivity, Fringe Effect of EIT sensors is explored for bladder volume measurement. In order to find the best stimulation pattern, this paper simulates seven stimulation patterns (using an integer value A as indicator) with a 16-electrodes EIT sensor. Meanwhile, it is investigated how stimulation patterns act with two typical electrodes arrangement, i.e. ring and semicircle. Sensitivity distribution and characteristic values related to the Fringe Effect of EIT sensors are used as evaluation criteria. The results show that when A=2 and the electrodes arrangement is semicircle, the bladder region has the highest mean sensitivity. Using semicircle arrangement ensures that all stimulation patterns except A=6 and 7 have satisfactory measurement sensitivities and less errors under changes of urine conductivity.
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IST - Compensation for Fringe Effect of electrical resistance tomography sensor by multiple-plane sensor scheme
2018 IEEE International Conference on Imaging Systems and Techniques (IST), 2018Co-Authors: Wenbin Tian, Lijun Xu, Wuqiang YangAbstract:Fringe Effect exists in conventional ERT sensors, i.e., severe distortions of electric field on both ends of sensor electrodes. This leads to a 3D sensing region for a 2D ERT sensor. As a result, the objects outside the ERT sensor plane can still be sensed and imaged, which is undesired and deteriorates the image accuracy. To tackle with this issue, a three-plane ERT sensor scheme is proposed. Simulation results show that the three-plane sensor scheme can compensate for the Fringe Effect induced by the object outside the measurement sensor plane regarding a distribution with three non-conductive bars at different cross-sectional and axial positions. Meanwhile, it is found that for axially uniform distributions, the proposed compensation method can reduce the size overestimation of non-conductive objects to be imaged by linear reconstruction method such as the Landweber iteration. Finally, an experimental ERT system is established to verify the findings from simulation.
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Compensation for Fringe Effect of electrical resistance tomography sensor by multiple-plane sensor scheme
2018 IEEE International Conference on Imaging Systems and Techniques (IST), 2018Co-Authors: Wenbin Tian, Lijun Xu, Wuqiang YangAbstract:Fringe Effect exists in conventional ERT sensors, i.e., severe distortions of electric field on both ends of sensor electrodes. This leads to a 3D sensing region for a 2D ERT sensor. As a result, the objects outside the ERT sensor plane can still be sensed and imaged, which is undesired and deteriorates the image accuracy. To tackle with this issue, a three-plane ERT sensor scheme is proposed. Simulation results show that the three-plane sensor scheme can compensate for the Fringe Effect induced by the object outside the measurement sensor plane regarding a distribution with three non-conductive bars at different cross-sectional and axial positions. Meanwhile, it is found that for axially uniform distributions, the proposed compensation method can reduce the size overestimation of non-conductive objects to be imaged by linear reconstruction method such as the Landweber iteration. Finally, an experimental ERT system is established to verify the findings from simulation.
Mikhail Skliar - One of the best experts on this subject based on the ideXlab platform.
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method for measuring thickness of dielectric films using microdielectric Fringe Effect sensors
Analytical Chemistry, 2006Co-Authors: Yunn-hong Choi, Prashant Tathireddy, Mikhail SkliarAbstract:A method for noninvasive thickness measurements of dielectric films using Fringe-Effect (FE) sensors is developed and experimentally validated. The fringing electrical field, created by electrodes microfabricated at the film substrate, depends on the film thickness and dielectric permittivity of the film under test (FUT). The unknown film thickness is estimated by matching the theoretical prediction of thickness-dependent sensor admittance with the measured value. In the case of FE sensors with spatially periodic, interdigitated electrode (IDE) configuration, the admittance prediction is simplified, which allows for the real-time measurements of changing thickness. The developed method can be used to continuously measure the changing dielectric permittivity of the FUT material, which makes it possible to determine the thickness of films of changing dielectric properties, caused by chemical or other transformations. The application of the developed method is demonstrated experimentally by measuring the thickness of silicon nitride film deposited in several increments on the quartz substrate of the IDE sensor. In the expected range of sensor sensitivity, the results show an excellent agreement with the independent thickness measurements.
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standard independent estimation of dielectric permittivity with microdielectric Fringe Effect sensors
Analytical Chemistry, 2005Co-Authors: Yunn-hong Choi, Mikhail SkliarAbstract:: Microdielectric spectroscopy with planar Fringe-Effect (FE) interdigital sensors is a useful method for noninvasive characterization of the interfacial properties of the materials. Unfortunately, obtaining an accurate dielectric spectrum is difficult because of the complexity of the probing electrical field created by the FE sensor and the contribution of the sensor substrate and stray elements to the overall measurements. Previously, quantitative microdielectric spectroscopy required the calibration of the FE sensor with standard materials that are known to be dielectrically similar to an unknown sample of interest. This limitation complicates the application of microdielectric spectroscopy, particularly in cases where the monitored sample undergoes a transformation that changes its dielectric permittivity. A standard-independent method for quantitative FE microdielectric measurements is proposed in this paper. The developed method is based on comparison of the theoretically predicted admittance of the FE sensor with the sample of known dielectric properties and the measured sensor admittance. Comparison of the theoretical predictions with the admittance measurements reveals the contribution of the unknown stray elements. The measurements with an unknown sample are then adjusted for the strays. The contribution of the sensor substrate to the sensor measurements is removed using the theoretical model derived from the electroquasistatic approximation of Maxwell equations. The dielectric permittivity of the material being tested is calculated by successively solving the system of complex nonlinear equations for each frequency at which the sensor admittance is measured. The developed method is illustrated by applying it to the dielectric measurements of several dissimilar samples. The results are in excellent agreement with those obtained using the gold standard parallel-plate measurement method over the entire range of frequencies.
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quantitative measurements of dielectric spectra with microdielectric Fringe Effect sensors
Analytical Chemistry, 2004Co-Authors: Yunn-hong Choi, Mikhail SkliarAbstract:: The parallel-plate method is a gold standard for measuring dielectric properties of materials. However, it requires sampling of the material under testing (MUT), which makes it less suitable for real time, dynamic, and in situ measurements. The alternative to the parallel-plate method is to use the microdielectric Fringe-Effect (FE) sensors, which can be placed inside the process or laboratory equipment to provide rapid, on-line, and noninvasive characterization of the dielectric properties. An additional potential advantage of the FE measurements is the ability to obtain spatially localized and interfacial measurements, which may be important in some applications. Unfortunately, interpretation of the FE sensor measurements is difficult because of the spatial nonuniformity of the electrical excitation field created by the FE sensor and the extraneous contributions from the sensor substrate and unknown stray elements. The objective of this study is to summarize the theoretical basis of the dielectric measurements using planar interdigitated sensors and to use it in the development of a new method for obtaining quantitative measurements with FE sensors. As the first step, the basic correlation between the impedance measurements obtained with the FE sensor and the dielectric properties of the MUT is elucidated. The theoretical results are then used to analyze the contribution of the sensor substrate and unknown stray components to the overall measurements. A novel calibration method to eliminate extraneous contributions is then proposed. The application example demonstrates the application of the developed method to the measurement of the dielectric permittivities of a polydispersed cis-polyisoprene samples. The results are compared with those obtained using the parallel-plate measurements and show excellent agreement. Experimental comparison with the alternative calibration methods is also performed, indicating significant improvement in accuracy of dielectric measurements over a broad range of frequencies.
Yunn-hong Choi - One of the best experts on this subject based on the ideXlab platform.
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method for measuring thickness of dielectric films using microdielectric Fringe Effect sensors
Analytical Chemistry, 2006Co-Authors: Yunn-hong Choi, Prashant Tathireddy, Mikhail SkliarAbstract:A method for noninvasive thickness measurements of dielectric films using Fringe-Effect (FE) sensors is developed and experimentally validated. The fringing electrical field, created by electrodes microfabricated at the film substrate, depends on the film thickness and dielectric permittivity of the film under test (FUT). The unknown film thickness is estimated by matching the theoretical prediction of thickness-dependent sensor admittance with the measured value. In the case of FE sensors with spatially periodic, interdigitated electrode (IDE) configuration, the admittance prediction is simplified, which allows for the real-time measurements of changing thickness. The developed method can be used to continuously measure the changing dielectric permittivity of the FUT material, which makes it possible to determine the thickness of films of changing dielectric properties, caused by chemical or other transformations. The application of the developed method is demonstrated experimentally by measuring the thickness of silicon nitride film deposited in several increments on the quartz substrate of the IDE sensor. In the expected range of sensor sensitivity, the results show an excellent agreement with the independent thickness measurements.
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standard independent estimation of dielectric permittivity with microdielectric Fringe Effect sensors
Analytical Chemistry, 2005Co-Authors: Yunn-hong Choi, Mikhail SkliarAbstract:: Microdielectric spectroscopy with planar Fringe-Effect (FE) interdigital sensors is a useful method for noninvasive characterization of the interfacial properties of the materials. Unfortunately, obtaining an accurate dielectric spectrum is difficult because of the complexity of the probing electrical field created by the FE sensor and the contribution of the sensor substrate and stray elements to the overall measurements. Previously, quantitative microdielectric spectroscopy required the calibration of the FE sensor with standard materials that are known to be dielectrically similar to an unknown sample of interest. This limitation complicates the application of microdielectric spectroscopy, particularly in cases where the monitored sample undergoes a transformation that changes its dielectric permittivity. A standard-independent method for quantitative FE microdielectric measurements is proposed in this paper. The developed method is based on comparison of the theoretically predicted admittance of the FE sensor with the sample of known dielectric properties and the measured sensor admittance. Comparison of the theoretical predictions with the admittance measurements reveals the contribution of the unknown stray elements. The measurements with an unknown sample are then adjusted for the strays. The contribution of the sensor substrate to the sensor measurements is removed using the theoretical model derived from the electroquasistatic approximation of Maxwell equations. The dielectric permittivity of the material being tested is calculated by successively solving the system of complex nonlinear equations for each frequency at which the sensor admittance is measured. The developed method is illustrated by applying it to the dielectric measurements of several dissimilar samples. The results are in excellent agreement with those obtained using the gold standard parallel-plate measurement method over the entire range of frequencies.
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quantitative measurements of dielectric spectra with microdielectric Fringe Effect sensors
Analytical Chemistry, 2004Co-Authors: Yunn-hong Choi, Mikhail SkliarAbstract:: The parallel-plate method is a gold standard for measuring dielectric properties of materials. However, it requires sampling of the material under testing (MUT), which makes it less suitable for real time, dynamic, and in situ measurements. The alternative to the parallel-plate method is to use the microdielectric Fringe-Effect (FE) sensors, which can be placed inside the process or laboratory equipment to provide rapid, on-line, and noninvasive characterization of the dielectric properties. An additional potential advantage of the FE measurements is the ability to obtain spatially localized and interfacial measurements, which may be important in some applications. Unfortunately, interpretation of the FE sensor measurements is difficult because of the spatial nonuniformity of the electrical excitation field created by the FE sensor and the extraneous contributions from the sensor substrate and unknown stray elements. The objective of this study is to summarize the theoretical basis of the dielectric measurements using planar interdigitated sensors and to use it in the development of a new method for obtaining quantitative measurements with FE sensors. As the first step, the basic correlation between the impedance measurements obtained with the FE sensor and the dielectric properties of the MUT is elucidated. The theoretical results are then used to analyze the contribution of the sensor substrate and unknown stray components to the overall measurements. A novel calibration method to eliminate extraneous contributions is then proposed. The application example demonstrates the application of the developed method to the measurement of the dielectric permittivities of a polydispersed cis-polyisoprene samples. The results are compared with those obtained using the parallel-plate measurements and show excellent agreement. Experimental comparison with the alternative calibration methods is also performed, indicating significant improvement in accuracy of dielectric measurements over a broad range of frequencies.
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Quantitative measurements of dielectric spectra using microdielectric Fringe-Effect sensors
Proceedings of the 2002 American Control Conference (IEEE Cat. No.CH37301), 2002Co-Authors: Yunn-hong Choi, M. SkliarAbstract:Microdielectric Fringe-Effect sensors are miniature planar interdigitated structures, which can be used in situ and in real time to measure electrical properties of materials, such as dielectric loss and storage, at the interface between the sensor and the sample. However, interpretation of the Fringe-Effect (FE) measurements is difficult due to the complexity of the excitation electrical field created by the FE sensor and the contribution of the sensor substrate and stray elements to the measured properties. In this paper, we present the basic theory, which relates the broadband impedance measurements obtained with the Fringe-Effect sensors and the actual electrical properties of the materials under test (MUT), and develop the calibration procedure which allows us to separate the contribution of the MUT sample and the sensor substrate from the overall measurements. Using the result of calibration as an initial guess, we then develop a compensation method, which allows us to remove the contribution of unknown properties of the FE sensor and other stray elements from instrumental measurements.
Lijun Xu - One of the best experts on this subject based on the ideXlab platform.
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IST - Effect of stimulation patterns on bladder volume measurement based on Fringe Effect of EIT sensors
2019 IEEE International Conference on Imaging Systems and Techniques (IST), 2019Co-Authors: Xiaofeng Liang, Lijun Xu, Wenbin TianAbstract:Real-time monitoring of bladder volume is necessary for patients with bladder dysfunction. Electrical impedance tomography (EIT) has the potential to be used for bladder volume measurement due to its advantages of noninvasive and real-time sensing. To overcome the sensitiveness of conventional EIT measurement methods to the urine conductivity, Fringe Effect of EIT sensors is explored for bladder volume measurement. In order to find the best stimulation pattern, this paper simulates seven stimulation patterns (using an integer value A as indicator) with a 16-electrodes EIT sensor. Meanwhile, it is investigated how stimulation patterns act with two typical electrodes arrangement, i.e. ring and semicircle. Sensitivity distribution and characteristic values related to the Fringe Effect of EIT sensors are used as evaluation criteria. The results show that when A=2 and the electrodes arrangement is semicircle, the bladder region has the highest mean sensitivity. Using semicircle arrangement ensures that all stimulation patterns except A=6 and 7 have satisfactory measurement sensitivities and less errors under changes of urine conductivity.
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investigation of multi plane scheme for compensation of Fringe Effect of electrical resistance tomography sensor
Sensors, 2019Co-Authors: Wenbin Tian, Xiaofeng Liang, Xiaolei Qu, Lijun Xu, Wuqiang YangAbstract:Conventional electrical resistance tomography (ERT) sensors suffer from the Fringe Effect, i.e., severe distortion of the electric field on both ends of the measurement electrodes, leading to a 3D sensing region for a 2D sensor. As a result, the objects outside an ERT sensor plane affect the sensing and hence image, i.e., deteriorating the image quality. To address this issue, a multiple-plane ERT sensor scheme is proposed in this paper. With this scheme, auxiliary sensor planes are used to provide references for the Fringe Effect of the measurement plane, for compensation by subtracting the weighed influence of the Fringe Effect. Simulation results show that the proposed scheme, either three-plane or two-plane sensor, can compensate for the Fringe Effect induced by objects outside the measurement plane with a variety of axial object distributions, i.e., several non-conductive bars or conductive bars placed at different cross-sectional and axial positions inside the sensor. Experiments were carried out. Images obtained with single-plane and multiple-plane ERT sensors are compared, and the proposed compensation scheme has been hence verified.
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Effect of stimulation patterns on bladder volume measurement based on Fringe Effect of EIT sensors
2019 IEEE International Conference on Imaging Systems and Techniques (IST), 2019Co-Authors: Xiaofeng Liang, Lijun Xu, Wenbin TianAbstract:Real-time monitoring of bladder volume is necessary for patients with bladder dysfunction. Electrical impedance tomography (EIT) has the potential to be used for bladder volume measurement due to its advantages of noninvasive and real-time sensing. To overcome the sensitiveness of conventional EIT measurement methods to the urine conductivity, Fringe Effect of EIT sensors is explored for bladder volume measurement. In order to find the best stimulation pattern, this paper simulates seven stimulation patterns (using an integer value A as indicator) with a 16-electrodes EIT sensor. Meanwhile, it is investigated how stimulation patterns act with two typical electrodes arrangement, i.e. ring and semicircle. Sensitivity distribution and characteristic values related to the Fringe Effect of EIT sensors are used as evaluation criteria. The results show that when A=2 and the electrodes arrangement is semicircle, the bladder region has the highest mean sensitivity. Using semicircle arrangement ensures that all stimulation patterns except A=6 and 7 have satisfactory measurement sensitivities and less errors under changes of urine conductivity.
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IST - Compensation for Fringe Effect of electrical resistance tomography sensor by multiple-plane sensor scheme
2018 IEEE International Conference on Imaging Systems and Techniques (IST), 2018Co-Authors: Wenbin Tian, Lijun Xu, Wuqiang YangAbstract:Fringe Effect exists in conventional ERT sensors, i.e., severe distortions of electric field on both ends of sensor electrodes. This leads to a 3D sensing region for a 2D ERT sensor. As a result, the objects outside the ERT sensor plane can still be sensed and imaged, which is undesired and deteriorates the image accuracy. To tackle with this issue, a three-plane ERT sensor scheme is proposed. Simulation results show that the three-plane sensor scheme can compensate for the Fringe Effect induced by the object outside the measurement sensor plane regarding a distribution with three non-conductive bars at different cross-sectional and axial positions. Meanwhile, it is found that for axially uniform distributions, the proposed compensation method can reduce the size overestimation of non-conductive objects to be imaged by linear reconstruction method such as the Landweber iteration. Finally, an experimental ERT system is established to verify the findings from simulation.
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Compensation for Fringe Effect of electrical resistance tomography sensor by multiple-plane sensor scheme
2018 IEEE International Conference on Imaging Systems and Techniques (IST), 2018Co-Authors: Wenbin Tian, Lijun Xu, Wuqiang YangAbstract:Fringe Effect exists in conventional ERT sensors, i.e., severe distortions of electric field on both ends of sensor electrodes. This leads to a 3D sensing region for a 2D ERT sensor. As a result, the objects outside the ERT sensor plane can still be sensed and imaged, which is undesired and deteriorates the image accuracy. To tackle with this issue, a three-plane ERT sensor scheme is proposed. Simulation results show that the three-plane sensor scheme can compensate for the Fringe Effect induced by the object outside the measurement sensor plane regarding a distribution with three non-conductive bars at different cross-sectional and axial positions. Meanwhile, it is found that for axially uniform distributions, the proposed compensation method can reduce the size overestimation of non-conductive objects to be imaged by linear reconstruction method such as the Landweber iteration. Finally, an experimental ERT system is established to verify the findings from simulation.
