摘要
在弱物体近似下从成像系统角度对光学相干层析测量技术进行了理论研究。分析了该技术测量样品纵深结构时图像的形成机理，结果表明它相当于一复振幅线性平移不变系统，从而可用相干传递函数描述系统性能。所得相干传递函数表明系统具有低通特性，半峰值带宽Δｋ＝２Δλ／λ２。由于物体频谱整体平移了１／λ，测量的是纵向结构的高频信息。
Optical coherence tomography (OCT) has been analyzed theoretically as an imaging system upon the weak object approximation. It has been proved that the OCT system behaves as a linear shift invariance system and can be described precisely by a coherent transfer function (CTF). The derived longitude CTF has shown that the system performs like a low pass filter with a FWHM Δ k=2 Δ λ/λ 2 . High spatial frequency structure is detected because the spectrum of the object shifted a distance of 1/λ . This research will provide a theoretical basis to quantitatively analyze the measuring results of the unknown structure and to increase further the spatial resolution.
出处
《光学学报》
EI
CAS
CSCD
北大核心
1996年第3期340-344,共5页
Acta Optica Sinica
关键词
光学相干层析
相干传递函数
optical coherence tomography, coherent transfer function, system analysis, optical detection.
