物距

球差对物距像距法测薄凸透镜焦距的影响

The effects of spherical aberration on measuring focus of thin convex lens with object distance image distance method

讨论物距对测量精度的影响，并给出合适的物距范围。

The influence of object distance on measurement accuracy is discussed and a proper object distance scope is given .

经过暗适应的晶体柱可以对不同物距的目标形成清晰的正重叠像，像的大小随物距的增大而减小。

A real optical superposition image was formed by dark-adapted crystalline cones for an object at different distances and its size decreased as the object distance increased .

本文在对象管的一系列计算基础上，进一步提出表征电子光学系统放大率M、物距P与象距Q之间内在联系的结构特征参数K的近似值。

On the basis of computer calculations for a series of image tubes , we proposed an approximation for structure characteristic parameter K characterizing the internal connection between magnification M , object distance P and image distance Q of an electron-optical system .

物距-像距法测凹透镜焦距实验中透镜的选择

The selection of concave lens in focal length measuring experiment by objective distance image distance method

通过研究热轧圆钢运动时的物距变化对摄象法在线检测的影响，提出了建立热轧圆钢运动中的相对监测系统。

The influence of the object distance changes in the on-line measurement and measuring errors of the instrument have been studied .

最后还分析了放大倍数以及物体尺寸相对于物距的大小对探测效率的影响。

The influence of imaging magnification and the ratio of object dimension to object-to-collimator distance on imaging efficiency was investigated as well .

本文对用物距像距法测薄凸透镜焦距时的不确定度进行了较全面的分析。

In this paper the complete analysis for uncertainty was given by using object and image distance mathods to measure the focal length .

本实验采用Sony717数码相机在暗箱中固定物距和焦距拍摄猪的眼肌图像，利用图像处理技术从中提取特征参数，并研究特征参数与实测眼肌面积、肌内脂肪含量及大理石花纹评分的关系。

We pictured loin-eye photos in a camera obscura by Sony 717 digital camera , which the focus and the distance are fixed .

变焦（距）（圆柱）透镜利用物距、像距法测量薄透镜的焦度是几何光学中最常用的方法。

Measuring the focal lengths of thin lens by means of object distance and image distance is a commonly utilized method in geometric optics .

根据光学透镜成像原理，推导近端和远端物像与相机焦距、视角和物距的关系式及其像比，借此控制相机视图中远近两端物像的形状反差。

The relationships between images of near and far objects with camera lens and field of view and object distance and the image ratio are researched .

结果表明，它的变换特性依赖于光功率、入射光束的束腰、物距以及透镜参数。

It is shown that the transformation characteristics depend on optical beam power , the beam waist of incident beams , object distance and lens parameters .

讨论了忽略主点间距及球差在物距像距法、共轭法测量非理想透镜焦距的系统误差。

This paper discusses the systematic error of the non-ideal thin convex lens focus measures by image between substance distance means or the conjugation means when neglect the main spots interval and ball disparity .

由于Ω型能量过滤器的物距较小，在零峰附近常伴随有衍射点，所以无论样品厚度如何，由Ω型能量过滤器采集的电子能量损失谱必须扣除多重散射的影响。

Because of the small objective distance in the in-column energy filter , the diffraction pattern was usually accompanied by the zero-loss peak . Whatever the sample thickness is , the plural scattering effect must be removed from the EELS spectra obtained by in-column energy filter .