变压器选型的分析及仿真

带一级负荷的变电所要求有至少两路独立电源,而在实际运行中由于两路进线在相位上可能存在相位偏差而使变压器不能并联运行,安全可靠供电失去了保障.针对一项工程实例,提出了变压器的选型方案,并经仿真证明了其可行性.     

双折射作用下横向受力光纤光栅反射谱的仿真研究

仿真分析了光纤布拉格光栅(FBG)横向受力时的双折射现象及其光纤光栅横向局部受力时的光谱变化,并进一步分析了双折射对横向局部受力光纤光栅的影响。当FBG横向局部受力部分较大时,光纤双折射对反射光谱的影响较大;当受力部分较小时,双折射的影响较小,此时可以把横向局部受力FBG结构看作法布里-珀罗(F-P)腔。希望这能对此类传感系统的光谱检测具有一定的参考价值。     

《光学测量》教学改革的若干思考

本文在教改指导思想下并结合教学实践,对现行教学模式下《光学测量》课程教学过程中主要存在的问题和解决方案进行了有效的教学改革探讨与尝试。实践证明这些改革措施在缓解授课学时与教学内容的矛盾,强化教学质量,拓宽学生的知识面以及增强学生学习兴趣等各方面效果显著。     

基于单片机的电力变压器试验自动测试装置的设计与应用

本文在研究电力变压器试验的基础上,设计了一种基于AVR单片机的电力变压器试验自动测试装置。该测试装置以单片机ATmega128为核心,采用C语言编程,具备打印试验结果、查看历史数据、参数设置等功能,可进行电力变压器的空载试验和负载试验,提高了工作效率。     

Review of several optical non-destructive analyses of an easel painting. Complementarity and crosschecking of the results

Five optical analyses of a given work of art are presented, using multispectral imaging, optical coherence tomography, goniophometry, UV-fluorescence emission spectroscopy and diffuse reflectance spectroscopy. All these methods are non-destructive, contactless, and implementable in situ. They all lead to results in quasi-real time. The multispectral camera allows imaging of the whole painting with very high definition and recording of 240 millions of spectra. Optical coherence tomography allows local 2D and 3D imaging with in-face and in depth stratigraphies inside the painting with a micrometric accuracy. It allows the evaluation of the pigment volume concentration inside a layer, the measurement of the thickness of one or two varnish layers, the detection and measurements of gaps inside the paint layer, the depth of varnish micro-cracks. Goniophotometry allows the measurement of the upper surface state of the painting in different locations, by quantifying the mean slope of the facets making up the surface. UV-fluorescence emission spectroscopy allows the identification of the resin, the binder and the ageing state of varnishes by use of databases of reference varnishes. Diffuse reflectance spectroscopy leads to pigment, pigment mixture and dye identifications again by use of databases. The three last methods are implemented with the same portable multi-function instrument. It allows time saving, locations on request in front of the artwork and easy use by non-scientists. Each instrument is described with its protocol and accuracy. The studied painting is a portrait of a lady painted by the Austrian artist Franz Strotszberg, chosen for its several restorations. The five kinds of results are successively detailed, analysed and compared between themselves. It is shown that the different results are complementary and their crosschecking brings thorough information. For example, the shape of the network of varnish micro-cracks detected on the surface with the multispectral camera is added to the measurement of their depth with optical coherence tomography. Another example allows connecting two different surface states of the upper varnished surface measured by goniophotometry with the identification of these varnish with UV-fluorescence and with their thicknesses measured with optical coherence tomography.     

一种轴承外圈检测系统中数据采集部分的研究

本文介绍了两点法在外圈参数测量中的应用及其优点,在阐述测量原理的基础上,分析了采集系统的组成、传感器的选择和同步采集的实现。最后对数据处理、控制流程等进行了说明。     

一种测量共模抑制比的方法

通过对常用的测量共模抑制比的方法的分析 ,提出了一种高精度的简便的测量运放的共模抑制比的方法.     

一种未来的计算机--三值光计算机

三值光计算机研究是众多新型计算机研究中的一种,其研究目的是尽快构造出充分发挥光的优点、实际可行、通用性强的光计算机。理论和实验成果都表明：它将有数万位的数据宽度。适合于处理具有高度并行性的问题。在它的结构中充分发挥了光和电子计算机的优点。相辅相成。由于使用的主要基础器件是已经商品化的二维液晶器件,所以是一个比较容易实现的未来计算机系统。     

基于单片机的光纤光栅解调系统的研究

分析光纤光栅传感机理,阐述可调光纤F-P滤波器的工作机理和特点,并基于单片机AT89C52实现光纤光栅解调系统。     

数字音乐图书馆与计算机光学乐谱识别技术

首先叙述了数字音乐图书馆的基本概念,然后针对数字音乐图书馆实施中面临的大量纸介质乐谱的数字化难题,介绍一种新的乐谱数字化技术———计算机光学乐谱识别技术,并对其实现原理和流程进行了简要阐述。