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Optical Engineering • Open Access

Self-spectral calibration for spectral domain optical coherence tomography
Author(s): Xianling Zhang; Wanrong Gao; Haiyi Bian; Chaoliang Chen; Jiuling Liao

Paper Abstract

A different real-time self-wavelength calibration method for spectral domain optical coherence tomography is presented in which interference spectra measured from two arbitrary points on the tissue surface are used for calibration. The method takes advantages of two favorable conditions of optical coherence tomography (OCT) signal. First, the signal back-scattered from the tissue surface is generally much stronger than that from positions in the tissue interior, so the spectral component of the surface interference could be extracted from the measured spectrum. Second, the tissue surface is not a plane and a phase difference exists between the light reflected from two different points on the surface. Compared with the zero-crossing automatic method, the introduced method has the advantage of removing the error due to dispersion mismatch or the common phase error. The method is tested experimentally to demonstrate the improved signal-to-noise ratio, higher axial resolution, and slower sensitivity degradation with depth when compared to the use of the zero-crossing method and applied to two-dimensional cross-sectional images of human finger skin.

Paper Details

Date Published: 19 June 2013
PDF: 8 pages
Opt. Eng. 52(6) 063603 doi: 10.1117/1.OE.52.6.063603
Published in: Optical Engineering Volume 52, Issue 6
Show Author Affiliations
Xianling Zhang, Nanjing Univ. of Science and Technology (China)
Wanrong Gao, Nanjing Univ. of Science and Technology (China)
Haiyi Bian, Nanjing Univ. of Science and Technology (China)
Chaoliang Chen, Nanjing Univ. of Science and Technology (China)
Jiuling Liao, Nanjing Univ. of Science and Technology (China)


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