Collection efficiency of a single optical fiber in turbid media.
Collection efficiency of a single optical fiber in turbid media.
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DOI：
10.1364/ao.42.003187
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发表时间：
2003-06
期刊：
影响因子：
1.9
通讯作者：
P. Bargo;S. Prahl;S. Jacques
中科院分区：
文献类型：
--
作者：
P. Bargo;S. Prahl;S. Jacques
如果一根光纤同时用于光的传输和收集，两个主要因素会影响收集光的测量：（1）介质中的光传输，它描述了返回光纤的光量;（2）与光纤的光耦合，它取决于进入光纤的光子的角分布。我们专注于后一个因素的重要性，并描述如何耦合的效率取决于介质的光学性质。对于高散射组织，效率很好地预测的数值孔径（NA）的光纤。对于较低的散射，例如在软组织中，光子从更深的深度到达光纤，并且耦合效率可以比NA预测的高出两倍到三倍。
If a single optical fiber is used for both delivery and collection of light, two major factors affect the measurement of collected light: (1) the light transport in the medium that describes the amount of light that returns to the fiber and (2) the light coupling to the optical fiber that depends on the angular distribution of photons entering the fiber. We focus on the importance of the latter factor and describe how the efficiency of the coupling depends on the optical properties of the medium. For highly scattering tissues, the efficiency is well predicted by the numerical aperture (NA) of the fiber. For lower scattering, such as in soft tissues, photons arrive at the fiber from deeper depths, and the coupling efficiency could increase twofold to threefold above that predicted by the NA.