15 March 1998 Detection of surface corrosion and contamination by optical second-harmonic generation: application to health monitoring and cleanliness inspection
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Abstract
This paper discusses the principles of surface second harmonic generation (SurfS) technique and its application to the remote in-situ detection of low levels of surface corrosion and contamination. SurfS is a nonlinear-optical technique which is surface sensitive. As an optical technique, SurfS is nonintrusive, noninvasive and nondestructive. The SurfS technique has spectroscopic capability. The formation of metal-oxide or other species due to corrosion or contamination will lead to a change in the spectral signature. This provides a means to monitor the onset of corrosion or deposition of contamination. Since the SurfS technique is surface specific, it can examine any optically accessible interface. During corrosion or contamination-induced chemical changes at an interface, the chemical changes at the interface can be monitored as they occur. In this way, the technique can be used in an in-situ fashion.
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Jeffrey H. Hunt, Jeffrey H. Hunt, } "Detection of surface corrosion and contamination by optical second-harmonic generation: application to health monitoring and cleanliness inspection", Proc. SPIE 3399, Process Control and Sensors for Manufacturing, (15 March 1998); doi: 10.1117/12.302560; https://doi.org/10.1117/12.302560
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