Nondestructive evaluation technique using infrared thermography and terahertz imaging

Abstract

Nondestructive testing (NDT) techniques using pulse heating infrared thermography and terahertz (THz) imaging were developed for detecting deterioration of oil tank floor, such as blister and delamination of corrosion protection coating, or corrosion of the bottom steel plate under coating. Experimental studies were conducted to demonstrate the practicability of developed techniques. It was found that the pulse heating infrared thermography was utilized for effective screening inspection and THz-TDS imaging technique performed well for the detailed inspection of coating deterioration and steel corrosion.

Automated detection and quantification of the onset of undercoating corrosion using pulsed thermography

“…In Sakagami et al [ 38 ] a moving average image binarization process is used to automatically detect corrosion under a coating but quantification of the extent of the corrosion is not provided. While the quantification of the depth of pitting corrosion in pipes was the focus of Liu et al, [ 23 ] the lateral size was not considered.…”