focal distance

1. One major problem the researchers had to overcome was the fact that the human eye, with its minimum focal distance of several centimetres, cannot resolve objects on a contact lens.
   研究人员必须解决的一个重要的问题是，人眼的最小焦距是几厘米，无法分辨出隐形眼镜上显示的物体。
2. In this paper, the focal distance formula of lens in varied shapes is obtained by using object methods to make its physical meaning more obvious.
   采用直观的方法得出了空气中各种形状的薄透镜的焦距公式，使其物理意义更加明显。
3. The picture would become clear lucidity while only adjusting good focal distance, this embodied the strength that the concentration has.
   只有调整好焦距时，图像才会变得清晰明朗，这就体现了集中所具有的力量。
4. This text is to compare Frensnel s zones plate with ordinary lens, on the axle point of light intension and focal distance as well as their difference in use.
   当光通过菲涅耳半波带与普通透镜时，可发现在轴上点的光强、焦距以及用途上的不同。
5. Comparing to see the objects with glasses, with seeing them directly will become bigger, equal or small all depends on focal distance between glasses and eyes.
   戴眼镜看物体与眼睛直接看物体时相比，物体究竟变小、等大还是变大，取决于眼镜与眼睛光心之距与眼睛的焦距。
6. An experimental investigation of the combination of a long focal distance Bragg-Fresnel lens with a bimorph mirror is described.
   描述了对长焦距布拉格-菲涅耳透镜与可变曲率半径反射镜组合所做的实验研究。
7. The convex lens focal distance measurement method of imaging technology with CCD
   实验室正透镜焦距测量方法之CCD成像技术的运用
8. The authors have reported two methods for measuring the efficient focal distance of the laser rod lenses.
   提出几种计算和测量激光棒负透镜等效焦距的方法。
9. A Simple Method to Measure the Focal Distance and Cardinal Points of a Compound Optical System
   测量光具组焦距和基点位置的简便方法
10. Light signal visibility test back focal distance
    灯光信号显示距离测试
11. The offset of the focal distance of this system could be defined properly by preliminary theory analysis, experimental demonstration and tracing the ray using illumination CAD soft-ware that programmed by ourselves.
    通过理论分析、实验论证和用自编制的照明设计CAD软件进行光线追迹，较好地确定了该系统的焦移量。
12. In this paper, the equations for solving the geometrical parameters of the ring-focus antenna with a variable focal distance for forming an elliptic beam are worked out, and a simple and efficient design method of the antenna is presented.
    导出了椭圆波束变焦距环焦天线重要几何参数的求解方程，给出了这种天线的简便而有效的的设计方法，并给出实测和理论的天线方向图。
13. Design of Annular Lens Dark Field Vertical Illumination System and Its Focal Distance Offset Characteristics
    环形透镜暗场落射照明系统设计及其焦移特性的研究
14. Error Analysis and Ways to Make fewer in Measuring Focal Distance of Convex Lens
    凸透镜焦距测量的误差分析和减小方法
15. From the focal distance formula of thin lens, the convergence and divergence nature of each kind of thin lens are discussed in different media.
    从薄透镜的焦距公式出发，讨论了各种透镜在不同介质中的会聚与发散性质。
16. The major photographic conditions are tube voltage, which relates to the thickness of seed and exposure value, which based on the tube voltage, focal distance and sensitive material.
    摄影条件主要取决于管电压和曝光值，管电压与种子厚度有关，曝光值则依管电压、焦片距和感光材料不同而异；
17. The Dynamic Measurement of the Thermal Focal Distance
    一种测量动态热焦距的方法
18. The degradation in quality of reconstructed image caused by the error in the focal distance of X ray source is discussed.
    本文分析了焦点距离（射线源到转轴的距离）D的误差对重建图像质量的影响，计算机模拟与实验结果表明，该种误差引起重建图像降质不甚明显。
19. Based on Lau effect in double grating, the focal distance of lens is measured.
    根据计量光栅的特点，可以利用双光栅效应测量透镜焦距。
20. Under the system software and hardware control, the system function is realized, such as adjust the control of diaphragm, focal distance and focus and the control of the image shot, screen monitor, landscape orientation scan, horizontal scan etc.
    在系统的软、硬件的控制下，完成系统功能的全面实现，比如调整光圈、焦距、聚焦等镜头的控制，图像的抓拍，画面的同屏对比监测，纵向扫描，横向扫描等控制。
21. Moreover, applying the matrix method in the close axis optics leads directly to the expression of the focal distance of magnetic lens if the matrix is transmitted by the lens.
    此外，应用类似于近轴光学中的矩阵方法，山磁透镜传输矩阵，直接导出了该磁透镜的焦距的表达式。
22. The improvement and error analysis of measuring focal distance of thin lens
    薄透镜焦距测定的改进及误差分析
23. In measuring the focal distance of lens, the experimental accuracy is often affected by the poor quality in the formation of images.
    在测量透镜焦距时，往往由于成像质量差而影响实验的精度。
24. On the determination of errors in thin lens ˊ focal distance
    对测定薄透镜焦距误差的探讨
25. The Function of Diaphragm in Measuring the Focal Distance of Lens
    光阑在透镜焦距测量中的作用
26. On the principle of variable focal distance and the development for zoom lens
    变焦镜的变焦原理与发展
27. Conjugate method is an accurate, simple and convenient method to measure the focal distance of thin convex lens.
    共轭法是一种较为准确和简便的测量薄透镜焦距的方法。
28. Determination of Correcting Focal Distance for Front Feed Four Horn Paraboloidal Reflector
    前馈四喇叭抛物面反射器天线校正焦距的确定
29. The phased array transducer through the electronic control line may the very convenient adjustment focal distance, the focal point size and the focal point intensity, has the very great practical value in the clinical treatment.
    相控阵换能器通过电子控制线路可以很方便的调节焦距、焦斑的大小和焦斑的强度，在临床治疗中有很大的实用价值。
30. The effects of the atmospheric refraction index structure constant, zenith angle, focal distance, beam topological charge, turbulence outer scale, etc. on the intensity distribution and spatial coherence on the receiver were studied for above-mentioned different types of beams with detail.
    分析了大气折射率结构常数、天顶角、焦距、光束拓扑荷和湍流外尺度等因素对上述不同特性激光束接收面光强分布和空间相干性的影响。

noun

1. the distance from a lens to its focus

   Synonym:    focal length