正弦相位调制的频域光学相干层析成像

Fourier-Domain Optical Coherence Tomography Based on Sinusoidal Phase Modulation

提出一种基于正弦相位调制的频域光学相干层析成像,利用正弦相位调制干涉术探测复频域干涉条纹的实部和虚部,重建复频域干涉条纹。对该复频域干涉条纹作逆傅里叶变换后,消除了频域光学相干层析成像中存在的复共轭镜像以及直流背景和自相干噪声。对玻璃片样品进行了层析成像实验。实验结果表明,采用正弦相位调制的频域光学相干层析成像,将可利用的成像深度范围扩大到原来的2倍,实现了全深度探测的频域光学相干层析成像。

A Fourier-domain optical coherence tomography based on sinusoidal phase modulation is presented. The complex Fourier domain interference fringe is reconstructed by detecting its real and imaginary components by sinusoidal phase modulating interferometry. After inverse Fourier transform of complex interference fringes, the complex conjugate mirror images, direct current background and self-coherent noise in the Fourier-domain optical coherence tomography are eliminated. The tomographic experiment on glass sample is carried out. The result indicates that the range of imaging depth is doubled, and the Fourier domain optical coherence tomography for fulldepth detection is realized.