【作者】 曹振新；

【导师】 吴乐南；

【作者基本信息】 东南大学 ， 信号与信息处理， 2005， 博士

【摘要】 感觉媒体和显示媒体是多媒体技术的重要分支,尽管目前的视听技术和显示技术发展迅速,然而感觉媒体中嗅觉、味觉等媒体的发展却相当滞后;同样,虽然目前存在多种显示技术,然而真高清晰、真彩色的显示技术发展也不尽人意。为此,本论文基于表面等离子体共振(SPR:Surface Plasmon Resonance)效应,主要研究了可以用于嗅觉、味觉的检测技术和高清晰、真彩色的显示技术。SPR效应是一种物理光学现象,利用该效应可以设计SPR传感器和SPR显示器:当调制层材料折射率一定,改变被测对象的折射率会导致共振波长或者共振强度变化,利用这一效应可以设计SPR传感器,借此可望扩充对于味觉、嗅觉等感觉媒体的自动化感知手段;而当被测对象折射率一定,改变调制层材料折射率会导致共振波长或者共振强度发生变化,利用这一效应可以设计高清晰、真彩色的新型显示器件,借此可望丰富对于显示媒体的表现形式。本论文首先讨论SPR机理,进而设计光纤SPR传感器和检测系统,研究数据处理方法,最后引入SPR显示技术,具体包括:从理论角度详细描述了SPR机理,导出了发生SPR现象的条件,给出了理论计算公式和相关参数的计算方法。详细研究了光纤SPR传感器的机理,推导了理论计算公式,并用实验表明该理论推导是合理的。根据建立的理论计算公式和实际检测的金膜光纤SPR传感器数据,对金膜参数进行了修正。为了设计出性能优异的光纤SPR传感器,从抗干扰、检测灵敏度、检测范围等多方面详细研究了传感器各设计参数对其性能的影响,给出了各项参数的选择范围。同时根据调制层对传感器参数的作用,提出了分布式光纤SPR传感器的设计方法,并提供了设计实例。详细研究了光纤SPR检测系统,对比了早期的检测系统、改进的检测系统和最优检测系统,详细设计了改进的检测系统,分析了该系统各组成部件的性能及其对系统性能的影响。进一步详细讨论了系统检测结果的数据处理问题,给出了共振波长的估计方法,并实用于准非时变信号和时变信号的检测,结果表明所用数据处理方法是合适和有效的。此外,详细研究了光纤SPR检测系统的标定、温度漂移和自漂移问题,同时详细研究了分布式光纤SPR检测系统的检测问题。详细研究了SPR显示的机理,建立了调制层参数和显示颜色、显示亮度的数学关系,据此设计了单像素和多像素的SPR显示器件,并且进行了理论仿真,结合前人的工作表明设计宽范围、真彩色的SPR显示器件是完全可行的。最后给出了本研究领域存在的问题和进一步研究的方向。总之,本论文主要对基于SPR效应的感觉(味觉、嗅觉)媒体和显示媒体,做了较为深入的理论和实验研究,为该领域的进一步深入和发展奠定了基础。更多还原

【Abstract】 Both feeling and displaying media are very important components in multimedia family. Although Audio/Video techniques have developed quickly at present, smelling and tasting technique are made very little progress in the multimedia study; although many display techniques have appeared and attained wide applications, the development of the high definition display being broader in its wavelength band and higher in its color resolution, is not satisfied by now. Fortunately, Surface Plasmon Resonance (SPR) effect can be applied to make smelling and tasting sensors and can be used to make novel displays.SPR effect is a kind of basic physics-optic phenomenon which has two important characters including that while the parameters of the modulation layer are fixed, to change the refractive index of the measured object will result in the changes in the resonant wavelength or intensity and while the refractive index of the measured object fixed, to change the modulation layer parameters will result in the changes in the resonant wavelength or intensity. SPR sensors are designed based on the former character and SPR displays based on the latter one.The main study contents in the dissertation are consisted of SPR principle, optical fiber SPR sensors and SPR displays.Firstly, the SPR principle is described theoretically in detail. Meanwhile the conditions to excite the SPR, the theoretical equations and the methods to compute the relative parameters are presented.Secondly, the principle of the optical fiber SPR sensors are studied detailedly and the theoretical equation to compute the output spectrum is deduced which has been proved correct by the experiments. Furthermore, the dispersive parameters of gold film are modified based on both the experiment results and the theory equation. To make optical fiber SPR sensors having higher performance, the influences of all parameters involved are discussed and analyzed systematically and the ranges of these parameters are provided from the sensor characters including anti-interference, detection sensitivity and detection range. The design method of the distributed optical fiber SPR sensors is studied and the example is presented too.Thirdly, the optical fiber SPR detection systems are studied in detail and the original system, improved system and optimal system are compared where the performance of the improved one along with the influences of its all components is focused on. Moreover, data processing is a very important aspect and the method to estimate the resonant wavelength is given which has been proved appropriate and effective by experiments. At the same time, the calibration, temperature induced drift and self-drift have been studied concretely, and the data processing of the distributed optical fiber SPR sensors is discussed.Fourthly, the SPR display principle is presented and the math relations between the display color andbright and the parameters of modulation layers are established. Both the single and multiple display elements are studied and designed and the simulation result is given too. This study and the former work prove that to design the SPR display apparatus with broader wavelength band and higher color resolution is realizable completely.Finally the existing problems and further study directions of the study field are pointed out.In a word, the deep studies about the smelling, tasting media and display media both theoretically and experimentally will establish a foundation to further researches.更多还原