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- Title
Performance evaluation of capacitive imaging sensors with different geometries.
- Authors
Zhen Li; Guoming Chen; Chen Li; Jiaming Fu; Yue Gu; Wei Li; Xiaokang Yin
- Abstract
In capacitive imaging (Cl), the geometry of the sensor is a key factor in sensor design, which definitively influences the performance of the Cl. In order to optimise the Cl sensor for the detection of defects with different depths and varying liftoff, it is useful to employ new Cl sensors with different geometries and evaluate their performance in terms of detecting defects in both conducting and non-conducting material. In this paper, four Cl sensors with different geometries are designed and evaluated. Finite element method (FEM) models are employed to verify the feasibility of detecting defects by changing the electric potential field lines and of obtaining the measurement sensitivity distribution. Cl experiments are carried out to detect defects with all of the sensors. The results show that a Cl sensor with a rectangular electrode pair is better than a conventional triangular sensor in terms of signal strength, and a Cl sensor with a circular electrode pair is better than a conventional triangular sensor in terms of the dynamic change rate (DCR). It is alsofound that for defects on the surface of a conducting material, the optimal lift-off changes with different geometries, while for defects on the surface and within a non-conducting material, the optimal lift-off remains at 1 mm for all of the sensors discussed in this study.
- Subjects
PERFORMANCE evaluation; PERFORMANCE of imaging systems; DETECTORS; NONDESTRUCTIVE testing equipment; SENSITIVITY &; specificity (Statistics)
- Publication
Insight: Non-Destructive Testing & Condition Monitoring, 2018, Vol 60, Issue 12, p676
- ISSN
1354-2575
- Publication type
Article
- DOI
10.1784/insi.2018.60.12.676