High resolution Fourier domain Optical Coherence Tomography at 2 microns for painted objects

Liang, H., Cheung, C.S., Daniel, J.M.O., Tokurakawa, M., Clarkson, W.A. and Spring, M. (2015) High resolution Fourier domain Optical Coherence Tomography at 2 microns for painted objects. Conference on Optics for Arts, Architecture, and Archaeology V: SPIE 9527, , Munich, Germany. 24 - 25 Jun 2015. 6 pp . (doi:10.1117/12.2185071).

Abstract

Optical Coherence Tomography has been successfully applied to the non-invasive imaging of subsurface microstructure of a variety of materials from biological tissues to painted objects of art. One of the limitations of the technique is the low depth of penetration due to the strong scattering and absorption in the material. Previous studies found that for paint materials, the optimum window for large depth of penetration is around 2.2 microns. This is also true for many other materials with low water content. We have previously demonstrated OCT systems in this wavelength regime for imaging with improved depth of penetration. In this paper, we present an improved 2 micron high resolution Fourier domain OCT system using a broadband supercontinuum source. The system achieved a depth resolution of 9 microns in air (or 6 microns in paint or any polymer).

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