光斑

The fundi were irradiated with a energy fluence of 20, 30 and 45 J/cm within 5 minutes after the drug injection of 2.5, 5 and 10 mg/kg.

光斑功率密度200、300和450mW／cm~2，能量密度20、30和45J／cm~2，分别在注射光敏剂结束后10s、5、10和15min行PDT操作，每组PDT方案10个光斑。

1 The fundi of the New Zealand's rabbits were irradiated by 532nm consecutive laser, the irradiation of the size were 1.5~2.5mm, the power density was 500~2400mW/ cm2 and the duration of irradiation

1 以新西兰兔为实验对象，532nm连续激光照射眼底，眼底光斑直径1.5～2.5mm，功率密度从500～2400mW／cm~2，照射时间100～300s，每组参数10个光斑。

According to the geometrical optics, the focusing spot of this parabolic mirror is studied by ray tracking.

根据几何光学原理，采用光线追迹的方法对该抛物面镜的光斑进行分析，证明通过抛物面镜反射聚焦后，能够将原始圆形激光束整形为光强分布均匀的窄条形光斑。

The divergence angle is calculated based on geometry characteristics of two facula curves detected at the different positions to the laser. Facula curves are gained through scanning by two hemicycle probes which have different radius.

该方法以激光光束传输到不同距离处的2条光斑外缘曲线的几何特征为基础来求LD的发散角，而2条光斑外缘曲线分别由2个半径不同的半圆环探头的旋转扫描探测获得。

Methods: To treat freckles and lentigo with Q-Switched Alexandrite laser in different wave length and energy. Wave length 755nm,energy density 5~10J/cm2,frequency:5~10Hz,spot diameter 2~3mm,Wave length 532nm,energy 5~10J/cm2,frequency: 5~10Hz,spot diameter 2~3mm.128 cases of freckle were treated 2 times,32 cases of lentigo were treated 1~3 times,the interval is 3 months.

采用Q开关755nm激光，能量密度为5~10J/cm2；频率5~10Hz；2~3mm光斑直径；Q开关532nm，能量密度2~4J/cm2；频率5~10Hz，2~3mm光斑直径激光对雀斑及雀斑样痣进行治疗，其中雀斑128例，经两次治疗，雀斑样痣32例经1~3次治疗，治疗间隔为3个月，结束治疗后随访24个月。

Firstly,the cameras were calibrated high accurately,and the stereoscopic vision system model was established.Secondly,the 3D coordinates of the center of LED on the light-pen were achieved through matching the 2D images grabbed by the two cameras.Then,a series of the 3D coordinates of the center of LED were used for fitting straight line,and the 3D coordinates of the pen-points can be obtained from the line.

首先，对摄像机进行了高精度的标定，建立了双目立体视觉系统模型；其次，通过左右摄像机拍摄的二维图像，将两幅图像中的点进行匹配，获得光笔上的LED光斑中心三维坐标；然后，由一系列LED光斑中心的三维坐标拟合直线，从直线上得到笔尖的三维坐标。

A new technique of real-time laser beam quality measurement is presented. It is based on a multiplane imaging method which consists of plate reflecting mirrors and enables simultaneous imaging of ten planes with various optical paths on a single charge coupled device array.

提出一种新型光束质量实时测量技术，该技术主要基于由平板反射镜组成的多平面成像系统，一次性将激光束腰附近2倍瑞利距离内的多个光斑成像在同一个平面上，用CCD相机获取这些光斑的光强分布图样。

The light propagation characteristics and light spot converter principles inside a cone are studied based on the principle of total reflection of light.

提出了一种圆周型光斑模式转换器——透明玻璃圆锥体，根据光的全反射原理论证了光在该圆锥体中的传输规律和对光束光斑模式的转换原理。

Theoretical analysis and simulation shows that the direction driving motor accelerates first, and then decelerates to compensate for the eccentricity when the satellite is deviated from laser center with a certain distance, and reacquires the tracking satellite. The needed time from reacquisition to tracking is affected by motor acceleration, telescope′s detecting precision, and detector′s response and treatment time, and the effect of detector precision on the reacquisition and re-tracking time is greater, as a result, the detector response and treatment time is decreased to the least.

理论分析与仿真结果表明，当卫星偏离光斑中心一定距离时，指向驱动电机先加速后减速，补偿这个偏心，重新捕获跟踪卫星；重新捕获到跟踪所需时间受电机加速度和望远镜探测精度以及探测器响应处理时间影响，其中探测器精度对重新捕获到跟踪所需时间影响较大，探测器响应处理时间要减小到最小；为了使从捕获到跟踪过程中卫星始终在扫描光斑范围内，经纬仪驱动电机的最小角加速度为25.5°/s2。

We present a new method for alignment optical axis and axis of rotation in laser direct writing system using reflection of plane grating.

提出一种光栅反射对准法：在极坐标激光直写系统中利用光栅反射聚焦光斑来校准光轴和工件台的转动轴；被光栅反射的聚焦光斑成像在CCD上。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失