J Biomed Opt. 2011 Mar;16(3):030501. doi: 10.1117/1.3552602.
We present a calibration protocol to obtain the alignment factors of a custom-made spectrometer and the nonlinear fitting function between the measured CCD pixel domain and the wavelength domain to apply to the spectral-domain optical coherence tomography (SD-OCT) using fiber Bragg gratings. We have used five gratings with different center wavelengths covering the broadband source spectral range. All have a narrow spectral bandwidth (0.05 nm) and the same reflectivity (92%) to calibrate and align the custom-made spectrometer. The implemented SD-OCT system following the proposed protocol showed the alignment factors as 44.37 deg incident angle, 53.11 deg diffraction angle, and 70.0-mm focal length. The spectral resolution of 0.187 nm was recalculated from the alignment factors.
我们提出了一种校准协议，以获得定制光谱仪的对准因子和测量 CCD 像素域与波长域之间的非线性拟合函数，以应用于使用光纤布拉格光栅的光谱域光相干断层扫描（SD-OCT）。我们使用了五个具有不同中心波长的光栅，涵盖了宽带光源的光谱范围。所有光栅的光谱带宽都很窄（0.05nm），反射率（92%）相同，用于校准和对准定制光谱仪。根据所提出的协议实现的 SD-OCT 系统显示的对准因子为 44.37 度入射角、53.11 度衍射角和 70.0mm 焦距。光谱分辨率从对准因子重新计算为 0.187nm。
