METHOD, DEVICE AND PROGRAM FOR DETECTING CORROSION OF STEEL MATERIAL UNDER COATING LAYER

摘要

PROBLEM TO BE SOLVED: To enable a volume of a corrosion part of a steel material under a coating layer to be nondestructively measured.

SOLUTION: A two-dimensional distribution measured value of reflection intensity is obtained by using an electromagnetic wave of a frequency range of 100 [GHz] to 10 [THz] and performing an electromagnetic wave measurement while interposing a coating layer for each two-dimensional measurement position of the coating layer surface of an object to be inspected; (a) an irradiation light electric field reflection coefficient l is calculated by using a reflection light electric field of each measurement position at the two-dimensional distribution measured value, to obtain an intrusion photoelectric field reflection coefficient k for each measurement position; or (b) an electric field attenuation factor m is calculated to obtain the intrusion photoelectric field reflection coefficient k for each measurement position (S5); a thickness dRof a corrosion layer of the steel material under the coating layer of the object to be inspected is obtained for each measurement position by using the intrusion photoelectric field reflection coefficient k (S6); and a volume V of a corrosion part of the steel material under the coating layer of the object to be inspected is obtained by using the thickness dRof the corrosion layer (S7).

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