A Novel Compensation Algorithm for Thickness Measurement Immune to Lift-Off Variations Using Eddy Current Method
arXiv:1905.13544 · doi:10.1109/TIM.2016.2600918
Abstract
Lift-off variation causes errors in the eddy current thickness measurements of metallic plates. In this paper, we have developed an algorithm that can compensate for this variation and produce an index that is linked to the thickness, but is virtually independent of lift-off. This index, termed as the compensated peak frequency, can be obtained from the measured multifrequency inductance spectral data using the algorithm we developed in this paper. This method has been derived through mathematical manipulation and verified by both the simulation and experimental data. Accuracy in the thickness measurements at different lift-offs proved to be within 2%.
arXiv admin note: text overlap with arXiv:1905.12515
Cited by in corpus (4)
- Reducing the Lift-Off Effect on Permeability Measurement for Magnetic Plates From Multifrequency Induction Data
- Measurement of permeability for ferrous metallic plates using a novel lift-off compensation technique on phase signature
- An equivalent-effect phenomenon in eddy current non-destructive testing of thin structures
- Custom Edge-Element FEM Solver and its Application to Eddy-Current Simulation of Realistic 2M-Element Human Brain Phantom