基于主动照明调制的水下偏振成像方法

浑浊水体中的光学衰减和吸收效应常常导致成像质量的明显下降,对诸多基于水下视觉图像的应用产生了不可忽视的影响。介绍了一种水下散射抑制的偏振成像方法,其关键思想是通过主动照明调制实现后向散射光偏振程度最大化,从而最大程度地抑制后向散射光。通过目标场景穆勒矩阵的测量、后向散射光的斯托克斯矢量的给定、入射主动照明斯托克斯矢量的确定,以及偏振特征矢量的计算,最终结合这些信息对散射介质中的图像进行复原。实验结果表明,该方法在处理浑浊水体下的成像问题方面表现出色。与其他方法相比,它显著提升了图像质量,为水下环境中的成像应用提供了有力的解决方案。该方法的独特之处在于其主动偏振照明调制技术,通过主动照明控制,实现了后向散射光的偏振特性调控,从而有效地减少了散射引起的成像退化,为水下偏振成像领域带来了新的研究思路。

用反向调制照明法分析光栅成像效应

提出了用反向调制照明法分析光栅成像效应的观点，研究了光栅系统的反向衍射干涉效应，成功地揭示了泰伯（Ｔａｌｂｏｔ）效应与劳（Ｌａｕ）效应的内在联系，并在白光双光栅衍射干涉的“消色效应’的基础上获得了白光扩展光源照明下的白光光栅成像效应和具有实用意义的四光栅干涉系统。

A Review of Applied Methods of Using Solar Energy in Iranian Buildings

Solar energy is the radiant light and heat from the Sun that has been harnessed by human since ancient times. Also secondary solar resources such as wind and wave power, hydroelectric power and biomass account for most of the available renewable energy on Earth, which can be used by human. Architects since alacient times have used various methods to hamesse and employ the solar energy for lighting, cooling and heating and etc. Meanwhile, Iran＇s ancient architecture, as an adaptive one, which consists of various climatic reigns, is filled with abounding examples of using sun energy in buildings. But, unfortunately despite these ancient methods, our modern architects mostly tend to provide energy of buildings with fossil fuels. This increases energy costs of the building＇s and also pollutes the environment. In this article it is intended to consider the ancient ways of using solar energy in Iran, and then suggest new methods for applying in modem buildings. The results of consideration show that among Solar technologies, passive and active methods, Iran＇s ancient architects have used passive methods, for example in mass and space, orientation and settlement of building. The idea of passive methods can be used in new shapes in current buildings, for instance by using solar space, central yard and etc. The suggestive method in this paper is combining the passive methods with the active ones.

亚20nm荧光超分辨显微技术研究进展(特邀)

荧光超分辨显微技术自20世纪90年代诞生以来,经历了多代创新与发展,其空间分辨率已经远超衍射极限,横向分辨率能够达20 nm以下,可以实现分子尺度的生物成像与动态追踪。新一代超高分辨率显微技术的产生得益于传统超分辨技术的深度发展和结合创新。详细介绍横向分辨率在亚20 nm尺度的新一代荧光超分辨显微技术,并阐述其与传统超分辨原理的联系与区别。此外,针对分辨率的限制因素,就光学系统、扫描策略和样品制备等方面进行探讨,并展望高分辨率荧光显微技术在生物医学领域中的应用前景和发展方向。