Abstract
An overview of the optical coherence tomography (OCT) technique is given. Time domain, spectral and sweep source modalities are briefly described, and important physical parameters of the OCT instrument are discussed. Examples of the application of OCT to diagnosis of various art objects such as oil paintings on canvas (imaging of glaze and varnish layers), porcelain, faience, and parchment are presented. Applications to surface profilometry of painting on canvas are also discussed.
Highlights
For more than a century, since a year after their discovery by W
Some other methods, such as laser induced breakdown spectroscopy (LIBS) [3, 4], Raman spectroscopy [4, 5] or, among more classical approaches, UV [6,7,8] and laser induced fluorescence (LIF) [9], and IR reflectography [10], are either limited to the object surface, or the information provided is integrated over the whole thickness of the object
X-ray radiography and neutron activation autoradiography [11] of paintings serve as examples in which such an indirect approach is taken
Summary
For more than a century, since a year after their discovery by W. X-ray radiography and neutron activation autoradiography [11] of paintings serve as examples in which such an indirect approach is taken In both cases, the location of certain pigments in the picture may be revealed, and sometimes lead to the discovery of different, underlying images. OCT has the great advantage of yielding high resolution cross-sectional images in a noncontact and noninvasive way, with very high sensitivity [13] Because of these advantages, OCT is suitable for medical applications, especially for investigating structures in the human eye, which is naturally transparent to visible and nearinfrared light, and almost inaccessible by any other diagnostic instrumentation [14]. A more comprehensive review may be found in many papers, for example, the article of Tomlins and Wang [15]
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