| 摘要 |
PROBLEM TO BE SOLVED: To detect a degree of deterioration progress of a protective coating film in steel products to grasp a timing to apply protective coating material again.SOLUTION: There is provided a deterioration detection method that detects a degree of deterioration progress of a protective coating material applied to a steel product 60. The deterioration detection method includes at least the steps of: sticking an optical fiber sensor 62 on a surface of the steel product 60; applying a protective coating material to the steel product 60 on which the optical fiber sensor 62 is stuck, so as to have the optical fiber sensor 62 covered; and connecting a measuring device to the optical fiber sensor 62 and measuring a strain on the basis of variation of characteristics of a lightwave propagated through the optical fiber sensor 62. The degree of deterioration progress of the protective coating material applied to the steel product 60 is detected based on the measured strain.SELECTED DRAWING: Figure 1 |
