自聚焦

Depending on the character of Lamb wave propagation , thedamage scat tering signals were time reversed and reemit ted to the damage , and then they will arrive at the damage synchronously so that the damage scat tering signal caught again will be amplified. Details about the time reversal amplifying process were analyzed and given. Based on the focalization ability of time reversal theory to the wave origin , the wave propagation was rebuilt by an image method which displays the damage as the focusing point .

根据信号传播自身的特性，研究采用时间反转聚焦方法使损伤散射信号能量叠加放大，从而提高信号的信噪比，分析给出了具体的损伤信号时间反转聚焦增强过程；利用时间反转法对波源的自适应聚焦能力，重建信号传播波动图，通过信号聚焦显示损伤位置和区域。

Self-focusing of an intense short laser beam propagating in cold, underdense plasma has been studied.

采用更完整的有质动力形式来研究强的短脉冲激光在次临界密度冷等离子体中传播时的自聚焦现象。

The small-scale self-focusing of divergent beams is studied.

研究了发散光束的小尺度自聚焦效应。

Nonlinear self-focusing of ripple can effect on far field in high energy too.

基于这些特点，理论分析了影响光束远场的因素以及在高通量下噪声纹波的非线性自聚焦效应，模拟了具有四程放大结构的高功率激光装置的传输特性，分别研究了注入光束振幅和光学元件引入的相位噪声对光束远场的影响。

Experimental investigation of digital fiber holography with self-focusing lens.

基于自聚焦透镜的光纤数字全息系统实验研究。

On the basis of the analysis,the self-focusing properties of the chirped Gaussian pulse in the chirped pulse amplification system were analyzed and discussed,and the numerical calculations were performed.

在此基础上，针对啁啾脉冲放大系统中的啁啾高斯脉冲，对其全光束自聚焦特性进行了计算模拟和分析讨论。

Analytical research of space-time nature of the self-focusing for femtosecond pulse .

飞秒光脉冲自聚焦的时空特性的解析研究。

Based on the aberrationless model of self-focusing, the location and intensity of hot image of Guassian optical beams is investigated.

本文以高斯光束为例，基于无像差自聚焦理论分析了有限束宽光束的&热像&形成规律。

As is known, in the new reflex cameras nikon, such as budget D40 and newest D40X, areabsent the built-in motors self-focusing.

众所周知，在新的反射的尼康相机，如预算D40和最新的CCD ，也没有内置马达自聚焦。

The nonlinear laser beam propagation in high power laser driver and the influence of the smallscale selffocusing and phase noise on beam quality in disk amplifier have been analyzed by a linear model.

建立了一套线性的近似分析方法，研究高功率激光驱动器中强激光传输的小尺度自聚焦效应和相位噪声对光束传输和光束质量的影响，给出了系统噪声强度、B积分值与光束近场调制对比度之间的定量关系。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。