光学相干层析成像的图像重建

层析成像技术－光学相干层析术是基于光学低相干反射测量发展而来的。介绍了用图像恢复的基本原理在光学相干层析术图像增强方面的工作。通过实验测量行到了解卷积所必需的点扩展函数。重建后的膜层结构图像的深度分辨率提高了一个数量级,图像也取得了了的锐化、去噪的效果。     

Deriving Intrinsic Parameters of Photoinduced Electron Transfer Reaction from the Transient Effect Probed by Picosecond Time-Resolved Fluorescence Quenching

Fluorescence quenching of a pyrylium salt (PDP²⁺) by toluene in acetonitrile gives rise to a nonexponential decay. This behavior is ascribed to the so-called transient effect occurring at high quencher concentrations for diffusion-controlled reactions. First, the Kalman filter was used to deconvolute the original signal from the experimental decay curve and the response function of the apparatus. This treatment led to a calculated deconvoluted decay curve which enabled the transient effect analysis to be conducted. This real decay curve was then analyzed using two models. The Smoluchowski—Collins—Kimball (SCK) model, applied to diffusion-controlled reactions, yielded the reaction radius r _AD and the intrinsic rate constant k _act of the bimolecular electron transfer reaction. The Marcus electron transfer/diffusion (ETD) model, which provides a powerful method to evaluate the electronic coupling H _el associate with the reaction, was also used but is more difficult to handle due to extensive computational needs. Finally, the adequacy of the two models (SCK and ETD) for analysis of the transient effect was addressed, as well as the appropriateness of the Kalman filter for fluorescence signal deconvolution.     

一种改进的光场μPIV反卷积重建算法

光场显微粒子图像测速技术(μPIV)利用Lucy-Richardson反卷积算法重建粒子场时需进行多次迭代计算,重建耗时长.为提高重建效率,本文利用光场μPIV流场测量过程中示踪粒子稀疏分布的特点,提出一种改进的反卷积重建算法.该算法以粒子场中非零元素与对应点扩散函数的乘积和代替粒子场与点扩散函数的卷积运算,减少了反卷...