分析也表明，利用聚焦的几何排布测量材料的非线性系数，具有比常规Z扫描方法更高的灵敏度。
Meanwhile, the analysis also shows that the sensitivity of Z scan technique with the focused optical system is higher than that of common Z scan technique.
前言：目的：研究声衰减系数、声速、温度等媒质参数对声聚焦的影响。
Objective: Study the influence of parameters such as attenuation coefficient, velocity of sound, and temperature of medium on focusing sound field.
分析也表明，聚焦几何排布可用于非线性折射系数的测量，并具有比常规Z扫描方法更高的灵敏度。
It is also shown that focused geometry arrangements can be employed for measurements of nonlinear refractive index with a higher sensitivity than that of common Z scan techniques.
用光线矩阵方法推导了光纤-自聚焦棒-反射器在共轴耦合情况下的后向耦合系数；
The expression of retroooupling coefficient of fiber-GRIN rod-reflector in coaxial coupling is derived by ray-matrix method.
聚焦于美国与世界其他国家的关系数日后，他将转向更重要的关系上，即他自己与美国人民的关系。
After days of focusing on the U. S. relationship with the rest of the world, he'll turn to an even more critical connection: his own, with the American people.
球差系数决定了最佳聚焦点的位置。
The best focal point is determined by the spherical aberration coefficient, and .
球差系数决定了最佳聚焦点的位置。
The best focal point is determined by the spherical aberration coefficient, and .
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