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Optics Letters

Optics Letters


  • Vol. 25, Iss. 16 — Aug. 15, 2000
  • pp: 1189–1191

Nondestructive evaluation of incipient corrosion in a metal beneath paint by second-harmonic tomography

Jinpin Ying, Feng Liu, P. P. Ho, and R. R. Alfano  »View Author Affiliations

Optics Letters, Vol. 25, Issue 16, pp. 1189-1191 (2000)

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A second-harmonic optical scanning imaging method for nondestructive evaluation of corrosion of painted metals is demonstrated. Two-dimensional images of the sectional structure from a sample of painted metal with corrosion were obtained by detection of second-harmonic generation (SHG). The second-harmonic signals generated from paint, corrosion, and metal can be spatially imaged in ~10-μm sliced subsurface layers. Corroded metal layers covered with paint are found to have more intensity variation than normal polished metal. The spatial mapping of the second-harmonic signals shows depth differentiation of paint, corrosion, and metal surfaces. The depth of corrosion beneath the paint can be measured from the SHG images.

© 2000 Optical Society of America

OCIS Codes
(110.6960) Imaging systems : Tomography
(180.5810) Microscopy : Scanning microscopy
(190.0190) Nonlinear optics : Nonlinear optics

Jinpin Ying, Feng Liu, P. P. Ho, and R. R. Alfano, "Nondestructive evaluation of incipient corrosion in a metal beneath paint by second-harmonic tomography," Opt. Lett. 25, 1189-1191 (2000)

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