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Proceedings Paper

Calibration method of spectral domain OCT system based on characteristic wavelength of light source
Author(s): Hui Li; Pinghe Wang; Hongzhou Dong; Zhongping Chen
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Paper Abstract

Accurate wavelength calibration is necessary to maximize imaging resolution and sensitivity in the spectral domain optical coherence tomography (SD-OCT) systems, which is the process of determining the wavelength distribution on a line-scan CCD. We present a novel method of calibrating the wavelength distribution of a spectrometer based on the broadband source spectral in SD-OCT system. This method uses the extreme points of the source spectrum and the corresponding CCD pixel points to establish a functional map. Therefore, additional calibration source with narrow spectral lines is not required. Third-order polynomial fitting function is obtained to fit the relationship between the CCD pixel number and the characteristic wavelength. As a comparison, this paper firstly tests the mercury-based argon lamp calibration method, analyzes its performance, and then tests the source-based calibration method. After comparing the curve parameters, we verify that the performance of the source-based spectral calibration method is as good as the mercury argon lamp calibration method. The feasibility and accuracy of the new method are verified by fitting results, sensitivity map and imaging. With the new calibration method, the sensitivity of the system roll-off of 2.163 dB / mm and high quality two-dimensional (2D) imaging of rubber tube is realized. This method is much simpler and reduces the cost because no additional calibration source is required.

Paper Details

Date Published: 20 November 2019
PDF: 6 pages
Proc. SPIE 11190, Optics in Health Care and Biomedical Optics IX, 1119025 (20 November 2019); doi: 10.1117/12.2537285
Show Author Affiliations
Hui Li, Univ. of Electronic Science and Technology (China)
Pinghe Wang, Univ. of Electronic Science and Technology (China)
Hongzhou Dong, Univ. of Electronic Science and Technology of China (China)
Zhongping Chen, Beckman Laser Institute and Medical Clinic (United States)


Published in SPIE Proceedings Vol. 11190:
Optics in Health Care and Biomedical Optics IX
Qingming Luo; Xingde Li; Ying Gu; Yuguo Tang; Dan Zhu, Editor(s)

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