Example of FSM - Inspection with removable instruments
1. Details of examination
2. Inspection and analysis procedures
①. Sensing-pins and electrodes are placed on an annular plate around a tank.
②. Potential differences (PD) between each paired sensing-pins are measured bi-directionally.
③. PD in a sound condition is calculated by using finite element method (FEM).
④. PD change rate is calculated using PD obtained from ② and ③.
⑤. In order to solve the simultaneous equation, PD change rate of each lattice is obtained.
⑥. PD change rate of each lattice is collated with the mastering curve. Thereby, the thickness distribution is obtained.
Example of result
Finally, the simultaneous equations are solved by using the result of bi-directional measurements and the plate thickness distribution is inferred as shown in the figure below.
Verification of accuracy