1) Focus error signal
聚焦误差信号
2) focusing error signal
(音响)聚焦误差信号
3) out-of-focus error signal
离焦误差信号
1.
We receive two relations, the first relation between refractive index of the critical-angle prism and focus-error signal; the second relation between numerical aperture of object lens and out-of-focus error signal.
本文针对伺服系统中常用的调焦方法-临界角方法进行了分析，理论上得到临界角棱镜的折射率、物镜的数值孔径与离焦误差信号的关系。
4) focusing error
聚焦误差
1.
The principle of the detection of the focusing error signal in a holographic optic head is dis- cussed.
讨论了全息光学头聚焦误差信号检测的基本原理。
2.
According to the principle of focusing error for two dimensions laser galvanometer scanning,a dynamic focusing optical model for correcting this error was put forward.
针对二维振镜存在的聚焦误差问题,根据产生聚焦误差的原理,采用动态聚焦技术补偿聚焦误差。
5) focus error
聚焦误差
1.
Analysis of the focus error characteristic in high density optical disk driver;
蓝光高密度光盘驱动器中聚焦误差特性分析
补充资料：冲击波聚焦效应