focal ratio

英 [ˈfəʊkl ˈreɪʃiəʊ]

美 [ˈfoʊkl ˈreɪʃioʊ]

网络  焦比; 焦距比; 焦比大

英英释义

noun

• the ratio of the focal length to the diameter of a (camera) lens system
  Synonym:f numberstop numberspeed

双语例句

• Study of the Tests of Large-aperture and Fast Focal Ratio Convex Hyperboloid Mirrors with a "Stitching" Method
  大口径快焦比凸双曲面拼接检测方法研究
• Using geometry theory and the Monte Carlo method study its 'geometric optical characteristics and focal plane density distribution, and consider influence of different error on geometric concentrating ratio and the flux density distribution.
  利用几何学原理和MonteCarlo方法研究新型多平面太阳能聚光器的几何光学特征及焦平面能流密度分布，分析不同综合误差对几何聚光比及能流密度分布的影响。
• Given the laser intensity, the optimum focal size increases with the pulse width, and the ratio of the optimum focal size to the pulse width is fixed.
  在相同激光强度下，电子能量增益的最佳焦斑大小随脉冲宽度的增大而增大，但最佳焦斑大小与脉冲宽度的比值基本上是不变的。
• The results indicated: the imaging distance of PS transformation related mainly to focal length of imaging lens, the system magnifying power related mainly to the ratio between the imaging lens focal length and holographic lens focal length.
  推导表明，PS变换成像的距离是较稳定的，主要与成像透镜焦距有关，系统放大率主要与成像透镜焦距和全息透镜焦距之比有关；
• Determination of focal mechanism using SH to p amplitude ratio
  用SH波和P波振幅比确定震源机制解
• It has many advantages to determine the focal mechanism by using SH and P wave amplitude ratio, but requires highly for the distribution of stations.
  用SH波和P波振幅比测定地震震源机制具有诸多优点，但它对台站布局要求较高。
• Determination of Focal Mechanism by Using SH and P Wave Amplitude Ratio
  利用SH波和P波振幅比测定中小地震的震源机制
• Focal point at the ratio of transmission calculating, every gear wheel torsion of the differential gear wheel system distributing and the Accident analysis and scheme of transforming for the stretcher straightener, We have carried on the detailed discussion to study.
  本文重点拉弯矫正机差速器传动系统的对传动比及效率计算、差速齿轮系统各齿轮扭矩分配、齿轮承载能力计算，气垫炉拉弯矫正机设备故障分析及改造方案进行了详细的讨论研究。
• The results show that the focal, field and remote precursory anomalies are of the following characteristics: The spatial distribution of anomalies is inhomogeneous, the distribution of anomalous monitoring stations of focal precursors is concentrated, and the anomaly ratio can reach 90%;
  结果表明，源、场、远兆异常有如下特征：异常空间展布不均，源兆空间内异常监测点展布“密集”、异常比例可达90%；
• It designs two estimating experiments to obtain the focal length value corresponding to the minimum CCD focal length, from which the ratio of the CCD focal length to its optical equivalent is derived.
  设计两种测量CCD等效焦距的实验方法，分别利用物像距离与物像长度的比例关系和平行双目成像原理，得到与CCD焦距极值对应的等效焦距。