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首页> 外文会议>Conference on Optical Technologies in Biophysics and Medicine IV; Oct 1-4, 2002; Saratov, Russia >The Specular Reflection Problem with a Single Fiber for Emission and Collection
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The Specular Reflection Problem with a Single Fiber for Emission and Collection

机译：用于发射和收集的单光纤的镜面反射问题

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摘要

A single fiber may be employed to emit and collect light from a optically diffusing medium such as biological tissues. However, the light collected by the fiber consists of two components: diffusely scattered light from within the tissue and specularly reflected light from the surfaces. Only the diffuse reflection contains the desired information regarding the optical absorption and scattering properties of the tissue, but the specular component is comparable in magnitude to the diffuse reflection with visible light. The refractive index mismatch between the fiber and tissue account for a portion of the specular reflection. However, imperfect contact of the fiber with the surface of tissue creates additional boundaries and thus additional specular reflections. Experiments are performed with a 200 micron diameter fiber and a 632.8 nm He-Ne source to characterize the specular reflection collected through the same fiber using water as a coupling medium. The angular collection efficiency is measured for a fiber in contact with the surface on a glass substrate (specular reflection only) and an epoxy resin tissue phantom (specular and diffuse reflection components). Next, the collection efficiency is measured for a separation between the fiber and the samples for perpendicular illumination to the surface, 14 degrees, and 25 degrees from the normal. Imperfect contact is demonstrated to vary the amount of specular reflection collected using a single fiber where changes in angle greater than 4 degrees or a separation between the fiber and the surface in excess of 400 micron caused a minimum of 7 percent reduction of the collected specular reflection.
机译：可以采用单根光纤来发射和收集来自诸如生物组织的光扩散介质的光。但是，纤维收集的光由两个部分组成：来自组织内部的散射光和来自表面的镜面反射光。仅漫反射包含有关组织的光吸收和散射特性的所需信息，但是镜面反射镜的分量在大小上与可见光的漫反射相当。纤维和组织之间的折射率不匹配是镜面反射的一部分。但是，纤维与组织表面的不完美接触会产生额外的边界，从而产生额外的镜面反射。使用直径为200微米的光纤和632.8 nm的He-Ne源进行实验，以表征使用水作为耦合介质通过同一根光纤收​​集的镜面反射。测量与玻璃基板表面（仅镜面反射）和环氧树脂组织体模（镜面反射和漫反射组件）接触的纤维的角度收集效率。接下来，针对垂直于表面，垂直于法线14度和25度的光线和垂直于表面的样本之间的距离，测量收集效率。事实证明，不完美的接触会改变使用单根光纤收集的镜面反射的数量，其中角度变化大于4度或光纤与表面之间的距离超过400微米会导致至少收集到的镜面反射减少7％。 。

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