Spatially resolved reflectance close to source has received a great deal of attention recently. This research is considered to develop a new noninvasive technique for measuring the optical properties of biological media. Using Monte Carlo simulations, we investigated the influence of third-order parameter on diffuse reflectance and found that the reflectance decreased with an increase of at a short source-detector separation of approximately 0.7-2 transport mean free paths. We show that the effects of two parameters, and secondorder parameter, on the reflectance are contrary. As a result the influence of the second-order parameter on the reflectance is irregular when the condition is not satisfied.

As an optical communication component with considerable potential, the Integrated Optical Acousto-optic Tunable Filter (IAOTF) has been paid great attention in recent years. With the advantages of low insertion-loss, broad tuning range, continual electric-tuning with high speed and simultaneous multiple-channel filtering, it has promising prospect in the future in a1l-optic networks. At first, the paper introduces acousto-optic coupling principle of AOTF briefly. Secondly, it concretely analyses the existing problems and the solutions of every developing stage with the research work of our laboratory. Finally, according to the developing trend of optical communication, we put forward a simple analysis of AOTF's developing direction and the method of improving AOTF's performance.

P3近似理论可以描述光源附近约1个输运平均自由程（MFP）内组织的漫反射光分布，这个区域的光分布与组织的散射相函数有关。利用P3近似理论研究了组合相函数的结构因子α对光源附近组织的漫反射光分布的影响。研究表明：在输运平均自由程不变条件下，各向异性因子的变化不引起漫射近似适用区域光分布的改变，但对光源附近约1个输运平均自由程附近的光分布有很大影响；α对漫反射率的影响远大于相函数的高阶矩对漫反射率的影响。研究结果对于使用内窥方式或对表层组织进行活体检测的空间分辨漫反射测量技术具有实际意义。

从辐射传输理论的相似关系出发，根据P1近似和P3近似满足的—阶和三阶相似关系。引入了特征长度的参量。利用半无限介质的空间分辨漫反射的P3的近似解。对光源附近组织的空间分辨漫反射与特征长度之间的关系进行了研究。研究表明。当需要在光源附近对组织进行测量时。最近的距离与描述该组织的特征长度有关，根据组织的特征长度可以确定探测器的大致宽度，并结合实际l光纤直径估计测量比纤的数目。

In this paper we discussed the method to reduce dimensions of segmentation feature applied to skin erythema image segmentation. Basing on analyzing a lot of erythema images, we proposed a new segmentation feature parameter applied to skin erythema image segmentation. At last, by using the fuzzy-c-means cluster arithmetic, we compared the segmentation speed and segmentation effect of adopting different segmentation features parameter and found that the segmentation result by using the new segmentation feature parameter is better.