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信息符
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  information mark
    Diagnostic pit width of the optical disk information mark
    光盘信息符特征宽度的确定
短句来源
    Validity of scalar diffraction theory must be checked, because the size of information mark (pit) of optical disk is comparable with or smaller than the laser wavelength.
    由于光盘信息符(坑点)尺寸可以和波长相比较或更小,标量衍射理论的有效性必需进行检验。
短句来源
    Classic scalar diffraction theory can't get correct result when the size of information mark (pit) of read only disk is comparable to or smaller than the wavelength of light.
    只读光盘信息符( 坑点) 尺寸可以和波长相比拟或在更小时标量衍射理论不再适用。
短句来源
    Comparing the results of the two theories, the conclusions can be made as the followings: firstly, the optimal readout signal modulation will occur when the area of an information mark is a little less than half of that of the readout beam spot according to the scalar diffraction theory.
    根据标量衍射理论,最佳调制度应出现在信息符面积为读出光斑面积一半时对应的信息符尺寸附近,且小于该尺寸;
短句来源
  information mark
    Diagnostic pit width of the optical disk information mark
    光盘信息符特征宽度的确定
短句来源
    Validity of scalar diffraction theory must be checked, because the size of information mark (pit) of optical disk is comparable with or smaller than the laser wavelength.
    由于光盘信息符(坑点)尺寸可以和波长相比较或更小,标量衍射理论的有效性必需进行检验。
短句来源
    Classic scalar diffraction theory can't get correct result when the size of information mark (pit) of read only disk is comparable to or smaller than the wavelength of light.
    只读光盘信息符( 坑点) 尺寸可以和波长相比拟或在更小时标量衍射理论不再适用。
短句来源
    Comparing the results of the two theories, the conclusions can be made as the followings: firstly, the optimal readout signal modulation will occur when the area of an information mark is a little less than half of that of the readout beam spot according to the scalar diffraction theory.
    根据标量衍射理论,最佳调制度应出现在信息符面积为读出光斑面积一半时对应的信息符尺寸附近,且小于该尺寸;
短句来源
  information mark
    Diagnostic pit width of the optical disk information mark
    光盘信息符特征宽度的确定
短句来源
    Validity of scalar diffraction theory must be checked, because the size of information mark (pit) of optical disk is comparable with or smaller than the laser wavelength.
    由于光盘信息符(坑点)尺寸可以和波长相比较或更小,标量衍射理论的有效性必需进行检验。
短句来源
    Classic scalar diffraction theory can't get correct result when the size of information mark (pit) of read only disk is comparable to or smaller than the wavelength of light.
    只读光盘信息符( 坑点) 尺寸可以和波长相比拟或在更小时标量衍射理论不再适用。
短句来源
    Comparing the results of the two theories, the conclusions can be made as the followings: firstly, the optimal readout signal modulation will occur when the area of an information mark is a little less than half of that of the readout beam spot according to the scalar diffraction theory.
    根据标量衍射理论,最佳调制度应出现在信息符面积为读出光斑面积一半时对应的信息符尺寸附近,且小于该尺寸;
短句来源
  “信息符”译为未确定词的双语例句
    The attenuation constant is in proportion to the density of the scattering dots, and also increased with the laser beam energy that records the information dots.
    结果表明,波导侧面散射光强沿传导光传播方向的分布呈指数衰减规律,其衰减常数与信息符密度成正比,还随记录信息所用的激光束能量的加大而增长。
    Simulation and Experiment Study on Recording Mask in Mastering
    母盘刻录中信息符成形模拟与实验研究
短句来源
    To read the information in the waveguide multilayer memory,an optoelectronic detector is used to detect the scattering beams emitted from the information dots on the waveguide surface.
    波导多层存储器通过收集波导侧面信息符发出的散射光来读取数据,而均光波导多层存储器的设计主要是为了解决波导多层存储器侧面散射光强不均匀的问题。
短句来源
    Study on the Pattern Parameters Effects of Optic Disk Read Out Signals
    光盘信息符形貌对读出信号影响的研究
短句来源
    Study on Statistical Characteristics of Speckle Patterns Generated by Optical Disk Information Marks
    光盘信息符散斑图的统计特性研究
短句来源
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Diffraction calculation is the basis of designing optical system of optical disk. Validity of scalar diffraction theory must be checked, because the size of information mark (pit) of optical disk is comparable with or smaller than the laser wavelength. The energy calculation error of scalar theory was investigated firstly. The error was as large as 19% for typical pit size. Then the polarization effect of incident wave was analyzed with coupled wave theory. It is found that the diffraction characteristic...

Diffraction calculation is the basis of designing optical system of optical disk. Validity of scalar diffraction theory must be checked, because the size of information mark (pit) of optical disk is comparable with or smaller than the laser wavelength. The energy calculation error of scalar theory was investigated firstly. The error was as large as 19% for typical pit size. Then the polarization effect of incident wave was analyzed with coupled wave theory. It is found that the diffraction characteristic of TE and TM polarization is far from the result of scalar theory, and difference also exist between TE and TM polarization. The difference can be ascribed to the boundary condition of the electromagnetic field, and it will increase with the decrease of the pit width. The error of scalar diffraction theory is very large for DVD, and vector diffraction theory must be employed to get correct result.

衍射计算是设计光盘光学系统的基础。由于光盘信息符(坑点)尺寸可以和波长相比较或更小,标量衍射理论的有效性必需进行检验。首先分析了标量衍射理论的能量计算误差。对于典型的坑点尺寸,标量理论的能量计算误差高达19%。然后用耦合波理论分析了入射波偏振态的影响。计算表明TM波和TE波的衍射特性与标量理论的结论相差较大,TM波和TE波的衍射行为也有差别。这种差别是由电磁场边界条件引起的,且会随着坑宽的缩小而增大。对于DVD,标量理论的误差已经很大,要得到准确的结果就必须采用矢量衍射理论。

Diffraction calculation is the basis of designing optical system of optical disk. Classic scalar diffraction theory can't get correct result when the size of information mark (pit) of read only disk is comparable to or smaller than the wavelength of light. The disk is modeled as a two dimensional grate in this paper, and formulas of diffracted field are derived employing coupled wave theory when the disk is detected by a plane wave. The curve of diffraction intensity versus pit depth is obtained, and the...

Diffraction calculation is the basis of designing optical system of optical disk. Classic scalar diffraction theory can't get correct result when the size of information mark (pit) of read only disk is comparable to or smaller than the wavelength of light. The disk is modeled as a two dimensional grate in this paper, and formulas of diffracted field are derived employing coupled wave theory when the disk is detected by a plane wave. The curve of diffraction intensity versus pit depth is obtained, and the concept of critical depth is put forward. According to the analysis, the critical depth decreases when transverse dimension of the pit reduce, which will result in the decrease of the diffraction intensity variety and limit the storage density of the optical disk finally. The effect of the detecting plane wave's polarization on the diffraction intensity is also investigated in this paper.

衍射计算是设计光盘光学系统的基础。只读光盘信息符( 坑点) 尺寸可以和波长相比拟或在更小时标量衍射理论不再适用。本文将光盘信息符抽象成二维光栅,应用耦合波理论导出了当用平面波检测光盘时衍射波场的计算公式,得到了衍射强度坑深曲线,并提出了临界坑深的概念。分析表明,临界坑深随着信息符横向尺寸的变小而变小,这将导致衍射波光强变化的减小,从而限制了光盘的存储密度。本文还分析了检测平面波的偏振态对衍射波强度的影响

A full vector diffraction theory for optical disk system is described. Firstly the focused incident beam is decomposed into a spectrum of plane waves, and the amplitude vector of each plane wave is acquired. Then the amplitude vectors of diffracted plane waves from the disk are calculated rigorously for each incident plane wave, and the spatial frequency spectrum of the total diffracted field is obtained. Finally the energy flux over the objective pupil is calculated and the read out signal of the optical...

A full vector diffraction theory for optical disk system is described. Firstly the focused incident beam is decomposed into a spectrum of plane waves, and the amplitude vector of each plane wave is acquired. Then the amplitude vectors of diffracted plane waves from the disk are calculated rigorously for each incident plane wave, and the spatial frequency spectrum of the total diffracted field is obtained. Finally the energy flux over the objective pupil is calculated and the read out signal of the optical disk system is obtained. In the diffraction calculation, the optical disk is modeled as a crossed metal grating, coordinate transformation method, coupled wave theory and modal method can be adopted according to the different modals of the information marker. The result of vector theory is far from that of the traditional scalar diffraction theory for a typical DVD system, so vector diffraction theory must be adopted.

本文以完整的矢量衍射理论分析了光盘光学系统。首先将入射的聚焦光束分解为平面波谱 ,得到每个平面波的振幅矢量 ;然后计算光盘对每个平面波的衍射 ,得到衍射波的振幅矢量 ,从而得到了整个衍射波场的空间频谱 ;最后计算物镜光瞳上的能通量 ,得到光盘系统的读出信号。在衍射计算中 ,光盘被定义为二维金属光栅 ,根据信息符的不同模型 ,选用坐标变换方法、耦合波方法或模态方法。对于典型的 DVD光学系统来说 ,矢量理论的结论与标量理论相差甚远 ,要得到正确的结果就必须采用矢量衍射理论

 
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