Detection of surface corrosion and contamination by optical second-harmonic generation: application to health monitoring and cleanliness inspection

Jeffrey H. Hunt

doi:10.1117/12.302560

15 March 1998 Detection of surface corrosion and contamination by optical second-harmonic generation: application to health monitoring and cleanliness inspection

Jeffrey H. Hunt

Author Affiliations +

Proceedings Volume 3399, Process Control and Sensors for Manufacturing; (1998) https://doi.org/10.1117/12.302560
Event: Non-Destructive Evaluation Techniques for Aging Infrastructure and Manufacturing, 1998, San Antonio, TX, United States

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.

Citation Download Citation

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); https://doi.org/10.1117/12.302560

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