Visualization investigation of defects in structural steel materials with electrical resistance tomography

Zhao, Shuanfeng; Zheng, Wei; Wu, Yuyao; Guo, Shuai; Liu, Bo

doi:10.1016/j.conbuildmat.2022.129274

Cited by 4 publications

(2 citation statements)

References 31 publications

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“…The presence of large voids would create localized regions of no current flow within the measurement volume, making it difficult to determine the temperature at those specific locations. Zhao et al have reported the feasibility of using ERT to determine the positions of multiple defects within the measurement volume and to estimate their respective sizes [32]. Therefore, in the measurement of molten glass, it should be possible to measure objects with defects as well as objects with significantly low local conductivity.…”

Section: Verification Of the Measurement System Using An Electrolyte ...mentioning

confidence: 99%

Temperature measurement of molten glass under batch feeding process by means of electrical resistance tomography

Kawaguchi,

Saito

2024

Meas. Sci. Technol.

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Electrical Resistance Tomography stands out as a powerful tool applicable to opaque environments, particularly in scenarios involving highly contaminated flows, gas-liquid two-phase flows with elevated void fractions, and electrically-conductive fields. The semi-conductive nature of high-temperature molten glass renders resistance tomography suitable for determining temperature distributions within such optically opaque mediums. This study aims to extend the application of the tomography technique to the spatial measurement of temperature in high-temperature molten glass. In order to verify the effectiveness of the developed system, a preliminary test was conducted by using an electrolyte solution in water to explore the overall system capabilities. Following the confirmation of the effective resolution of the proposed system, the measurement apparatus was employed for the actual temperature measurement of molten glass. The developed equipment featured sixteen independent electrodes, a low-impedance multiplexer, amplifier, rectifier, and a oscillating signal generator. Electrical potentials of the electrodes were recorded using a high- impedance amplifier as well as a data logging system. Upon collecting the electrical potential dataset, reconstruction computations were executed using the software. The measurement results show that the developed measurement system facilitates the acquisition of quantitative temperature distributions, as evidenced by the injection of a batch of low-temperature glass beads.

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Section: Verification Of the Measurement System Using An Electrolyte ...mentioning

confidence: 99%

Temperature measurement of molten glass under batch feeding process by means of electrical resistance tomography

Kawaguchi,

Saito

2024

Meas. Sci. Technol.

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“…In this context, electrical resistivity techniques have emerged as a promising tool for non-destructive moisture assessment in various materials, including soils (Brunet et al, 2010;M. H. Loke et al, 2013;Singh & Sharma, 2022), steel (Zhao et al, 2022), concrete (Akhnoukh, 2021;Karhunen et al, 2010;Lataste et al, 2003), and wood (Hafsa et al, 2023). Electrical resistivity methods rely on the principle that the electrical resistivity of a material is sensitive to changes in its moisture content, with water being a good conductor of electricity.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Effectiveness of Wenner Modes Configurations for Resistivity-Based Moisture Monitoring in Compressed Earth Bricks

Nguyen,

Pham,

Angellier

et al. 2024

Preprint

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Compressed earth bricks (CEBs) are emerging as an eco-friendly construction material, although their properties are highly moisture-dependent. This study investigates the applicability of electrical resistivity techniques for non-destructive moisture assessment in CEBs and determines the optimal electrode configurations for small-scale CEB samples. Various Wenner array electrode configurations, including Wenner Alpha, Beta, and Gamma arrangements, are tested on the CEB specimens across a wide range of relative humidity levels. Numerical modelling using the finite element method is employed to simulate the current diffusion process in the CEB samples. A mathematical formulation is developed to calculate the true electrical resistivity of the specimens based on the measured resistance and the geometric factor obtained from the numerical model. The results show that the electrical resistivity of CEBs exhibits a logarithmic relationship with moisture content, with Wenner Alpha and Gamma configurations proving most suitable for small-scale samples. This approach demonstrates the potential for enabling continuous moisture monitoring to empower quality control and service life predictions for earthen construction materials.

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In situ Electrical Impedance Tomography for Visualizing Water Transportation in Hygroscopic Aerogels

Tang,

Zhong,

et al. 2024

Advanced Science

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The global water crisis demands immediate attention, and atmospheric water harvesting (AWH) provides a viable alternative. However, studying the real‐time subtle relationship between water absorption, diffusion, and internal structure for hygroscopic materials is challenging. Herein, a dynamic visualization technique is proposed that utilizes an in situ electrical impedance tomography (EIT) system and a precise reconstruction algorithm to achieve real‐time monitoring of the water sorption process within aerogels from an internal microstructural perspective. These results can be inferred that composites' pore sizes affecting the kinetics of their moisture absorption. In addition, the diffusion path of moisture absorption and the distribution of stored moisture inside aerogels exhibit intrinsic self‐selective behavior, where the fiber skeleton of the aerogel plays a crucial role. In summary, this work proposes a generic EIT‐based technique for the in situ and dynamic monitoring of the hygroscopic process, pointing to an entirely new approach regarding research on AWH materials.

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Visualization investigation of defects in structural steel materials with electrical resistance tomography

Cited by 4 publications

References 31 publications

Temperature measurement of molten glass under batch feeding process by means of electrical resistance tomography

Temperature measurement of molten glass under batch feeding process by means of electrical resistance tomography

Evaluating the Effectiveness of Wenner Modes Configurations for Resistivity-Based Moisture Monitoring in Compressed Earth Bricks

In situ Electrical Impedance Tomography for Visualizing Water Transportation in Hygroscopic Aerogels

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