A threshold optimization strategy for reducing the noise of co-planar array capacitive imaging

Li, Ruihang; Zhang, Yuyan; Wen, Yintang; Zhao, Peng; Zhao, Zhenhao

doi:10.1016/j.ndteint.2022.102738

Cited by 10 publications

(1 citation statement)

References 19 publications

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“…Capacitive imaging (CI) technology tests a specimen by using the quasistatic edge electric field generated between coplanar electrodes (Yin et al, 2020a). When defects are present in the specimen, they cause disturbances to the quasistatic edge electric field (Li et al, 2023;Li et al, 2018aLi et al, , 2018bYin et al, 2018). Variations in the capacitance value between coplanar electrodes occur as a result of changes in the quasistatic edge electric field.…”

Section: Introductionmentioning

confidence: 99%

The semi-analytical model of capacitive imaging (CI) sensors based on the renormalization group method

Li,

Han,

Zhao

et al. 2024

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Purpose This study aims to design and validate a theoretical model for capacitive imaging (CI) sensors that incorporates the interelectrode shielding and surrounding shielding electrodes. Through experimental verification, the effectiveness of the theoretical model in evaluating CI sensors equipped with shielding electrodes has been demonstrated. Design/methodology/approach The study begins by incorporating the interelectrode shielding and surrounding shielding electrodes of CI sensors into the theoretical model. A method for deriving the semianalytical model is proposed, using the renormalization group method and physical model. Based on random geometric parameters of CI sensors, capacitance values are calculated using both simulation models and theoretical models. Three different types of CI sensors with varying geometric parameters are designed and manufactured for experimental testing. Findings The study’s results indicate that the errors of the semianalytical model for the CI sensor are predominantly below 5%, with all errors falling below 10%. This suggests that the semianalytical model, derived using the renormalization group method, effectively evaluates CI sensors equipped with shielding electrodes. The experimental results demonstrate the efficacy of the theoretical model in accurately predicting the capacitance values of the CI sensors. Originality/value The theoretical model of CI sensors is described by incorporating the interelectrode shielding and surrounding shielding electrodes into the model. This comprehensive approach allows for a more accurate evaluation of the detecting capability of CI sensors, as well as optimization of their performance.

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