f number

英 [ˈef nʌmbə(r)]

美 [ˈef nʌmbər]

焦距值；光圈数

英英释义

noun

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

双语例句

• The matric characteristics and convergences on F-number space
  F数空间的度量特征及收敛性
• Investigation on space optical system of high F number and high resolution
  大F数高分辨率空间望远镜光学系统
• The author presents a method of calculating the error of location and analyses the relationship between the error of location and the frequency difference of double-frequency grating ( or the amount of shear) and F number of the system.
  文中提出了计算定焦误差的方法，分析了定焦误差与双频光栅的频率差（或剪切量）及系统的F数之间的关系。
• F any product on which the serial number has been removed, defaced or modified.
  任何产品上的序列号已被删除，涂改或修改。
• The results were correlated in term of j and f as a function of Reynolds number and the geometrical parameters of heat exchangers by multiple linear regression technique.
  通过多元线性回归法将实验数据整理为以雷诺数和换热器几何参数为自变量的j和f关联式。
• The F number was 1. The lens group consisted of 3 elements.
  设计的物镜F数为1，三片式结构。
• The F is a number field or a infinite field.
  F是一个数域无限域。
• Study of F Number of Microlenses for Collimation of Laser Diode Arrays
  阵列激光微透镜准直器透镜F数的研究
• Improving the Fill Factor and F Number of Refractive Microlens Array by Reducing Developing Time
  通过缩短显影时间提高微透镜阵列的填充因子与F数
• A modified first-derivative based QRST detection algorithm as well as a proposed adaptive f wave number detection algorithm was utilized in the method, and new conditions was set for AF detection.
  该方法应用了改进的一阶差分QRST检测算法和提出的自适应f波波数检测算法，并设置了新的房颤检测条件。