Abstract
Abstract This article presents the portable Raman spectroscopy as a novel noncontact chemical sensing technique for steel corrosion analysis that can be used in field bridge inspection. To validate its feasibility, the portable system was tested with four steel specimen sets by gradually increasing the complexity of corrosion products in atmospheric corrosion. A software algorithm was developed to process a large set of Raman spectra for automated chemical identification and two-dimensional chemical mapping. The portable Raman spectroscopy has advantages over conventional nondestructive evaluation techniques because (i) absolute chemical identification of corrosion products is possible without involving field calibration, (ii) no surface preparation is necessary, (iii) it allows for field inspection for periodic or in situ corrosion analysis, (iv) and because, being a noncontact portable sensing technique, it can be combined with a drone or robot for automated bridge inspection.
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