Emergence of focal switch is analyzed, and conditions for its emergence are obtained. Influences of truncated parameter and Fresnel number on focal shift are analyzed.
通过图例详细分析了焦开关的产生过程，得出形成这一现象的条件，分析了截断参数、菲涅尔数等物理参数对焦移变化量的大小产生的影响，从传输公式出发对焦开关的产生作了物理诠释。
参考来源 - 光束的聚焦特性研究：焦移，焦开关和相移Consequently, the existence of focal switch makes the actual focusing work more complex and more significant.
显然,焦开关的存在使得实际聚焦工作更为复杂,同时更具实际意义。
参考来源 - 光束聚焦中的焦开关现象研究·2,447,543篇论文数据，部分数据来源于NoteExpress
研究了相位倾斜l - G光束通过光阑——透镜分离系统的焦开关现象。
It investigates the focal switch phenomenon of a tilted phase L-G beam passing through a system with the aperture and lens separated.
研究表明：像散对焦开关行为的影响表现在相对跃变量上，而不是焦开关出现的临界位置。
It is shown that the influence of astigmatism on the behavior of the focal switch is the relative transition height but not the turning point, where the focal switch can take place.
该实验使用集成霍尔开关传感器，结合焦利氏秤用振动法求弹簧的倔强系数，并介绍了计算弹簧有效质量的一种方法。
The experiment used integrated hall switch sensor and Jonly balance in measuring obstinacy modulus, offered a method of calculating the spring efficiency mass.
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