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[IEEE 2018 IEEE International Conference on Imaging Systems and Techniques (IST) - Krakow, Poland (2018.10.16-2018.10.18)] 2018 IEEE International Conference on Imaging Systems and Techniques (IST) - Level measurement of separator by using electrical tomography sensor
摘要： This paper presents a novel method for detecting the level of oil-water separation in a separator using electrical capacitance tomography (ECT) and electrical resistance tomography (ERT). The feasibility of using ECT and ERT for interface detection in separators has been studied in many studies [1]-[3]. As the dielectric constant of oil and water is different, the capacitance will change when the sensor moves from oil to water. When the position of oil-water interface is at the upper end of the electrode pair A-B, the capacitance measurement C1,2 will change. When the position of oil-water interface is at the upper end of the electrode pair A-D, the capacitance measurement C1,4 will change. So we can get the formulas for calculating the oil level. For ERT, when the sensor moves from oil to water, the resistance will change. When the position of oil-water interface is at the upper end of the electrode pair A-B, the resistance measurement R1,2 will change. When the position of oil-water interface is at the upper end of the electrode pair A-D, the resistance measurement R1,4 will change. So we can get the formulas for calculating the oil level. The experimental results show that the proposed method can accurately detect the oil-water interface level in the separator.
关键词： electrical capacitance tomography,electrical resistance tomography,separator level detection
更新于2025-09-23 15:22:29
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[IEEE 2018 IEEE International Conference on Imaging Systems and Techniques (IST) - Krakow, Poland (2018.10.16-2018.10.18)] 2018 IEEE International Conference on Imaging Systems and Techniques (IST) - Compensation for fringe effect of electrical resistance tomography sensor by multiple-plane sensor scheme
摘要： 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.
关键词： Electrical resistance tomography,Fringe effect
更新于2025-09-23 15:22:29
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Direct effects of UV irradiation on graphene-based nanocomposite films revealed by electrical resistance tomography
摘要： The integration of surface sensing elements providing an in situ monitoring of the UV-induced degradation effects in composite materials and structures is crucial for their applications in hostile environments characterized by high levels of radiation, such as space. In this work, the electrical response of a novel UV-sensitive nanocomposite film was investigated using electrical resistance tomography (ERT). The conductivity changes measured at the irradiated surfaces were compared with results from morphology analysis by scanning electron microscopy (SEM) and surface analytical techniques, such as Raman microscopy. Highly conductive and UV-sensitive nanocomposite coatings were prepared by embedding the graphene and deoxyribonucleic acid (DNA) component in a poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) matrix. The coatings were deposited onto carbon-reinforced laminated structures fabricated by resin transfer molding process using an aerospace-grade epoxy resin. Two different irradiation conditions were tested by exposing the nanocomposite surfaces to UV-C irradiances of 2.6 and 4.0 mW/cm2. Results show that the ERT technique has great potential for the in situ health monitoring of carbon-based materials and structures for aerospace applications, which are subject to degradation by UV-C radiation: it allows mapping of the conductivity changes occurring at the surface of the graphene/DNA/PEDOT:PSS coatings during irradiation.
关键词： Electrical resistance tomography,B. Electrical properties,A. Functional composites,A. Nano composites
更新于2025-09-16 10:30:52