光束

The influence of residual beam wander can be reduced by enlarging the beam divergence angle.

增大光束发散角可有效降低光束漂移的影响。

Inthis paper, a new method is presented, in which we measure the thickness ofsurface film layer by means of measuring the distance between correspondingtwo dark lines in two groups of white light interference fringes that are res-Pectively produced by two beam reflected by two surface of the thin filmlayer and another beam coming from another arm in Michelson interferome-t...

本文提出一种新方法，它利用迈克耳逊干涉光路，通过对膜层前后两表面反射光束和来自另一臂的反射光束产生的两组白光干涉纹黑线间隔的测量，即可得到表面膜层的厚度、这种测量方法迅速、简便、设备简单、精确度高、不损伤膜层表面，适合在实验室和工厂广泛应用。

In the high accuracy diffraction measurement of laser for a tiny wire,polarization direction of laser,laser beam property,and deviation of the beam center from the wire center have an effect on the measuring result.

在丝径的激光高精度衍射测量中，激光的偏振方向、光束的几何属性和光束中心对衍射体对称中心的偏离都会影响测量的结果。

It was found that the output correlation peak value decreased with the decrease of the waist radius of Gaussian beam and the increase of the interval between target image on input plane and the center of Gaussian beam.

得到了输出相关峰值随高斯光束腰斑半径减小和输入平面上目标图像位置偏离高斯光束中心距离的增加而减小的结果。

For DHS model, one beam can act as pump beam to supply energy for the other beam, which behaves as the signal beam.

对于后者，我们把提供能量的光束称为泵浦光，得到能量转移的光束称为信号光。

The prototype system considers the geometry of the building, the position of the source and receiver, and the acoustic properties of the sound transmission (the sound absorption coefficient of the walls and the temperature of the environment). The system then builds the beam tree by beam tracing, and finds all possible paths of the transmission and reflection. All sound paths are then traced to compute the sound obtained by the receiver.

本系统利用建筑物的几何空间、音源与接收者的资讯，考虑建筑材料的吸音系数、环境的温度等声学相关属性，使用光束追踪法建立光束树，寻找各种可能的穿透与反射路径，建立声音的路径模型，并且计算声音的衰减，处理声音的音响输出，来模拟接收者所听到的声音与回响。

Furthermore, the interference fringes of vortex beam are experimental investigated as well, it is found that the experimental observations are well consistent with the theoretical analysis.

对干涉条纹进行观察发现，实验观察结果和理论结果基本上保持一致，可以通过观察涡旋光束的干涉条纹来判断涡旋光束的轨道角动量。

This was because its flow velocity changed little in direction than the other one. However, the Z-like tube was a little better than the U-like tube when without blowing.

结果表明：不吹气时，管道结构对流场的影响远小于气体吸热对流场的影响；吹气时，管道内气体流速较大，管道结构对流场分布的影响比较明显；吹气时，U形管道对光束的影响比Z形管道对光束的影响要小。

A differential demodulation system of Laser Doppler is designed. Phase grating is adopt to obtain same intensity measured beams with big separative angle in the system,and by focusing the waists of two Gauss beams on the measured object with extender and collimating lens group, the smallest speckle and the superposition of plane waves are obtained.

设计了一种差动检波系统，采用相位光栅获得同光强、大夹角的测量光束，用扩束准直透镜组使两束高斯光束的束腰聚焦在被测物体上，得到最小光斑和平面波的叠加。

Under the conditions of single—beam and three—beam illuminating measuring point separately and other factors unchanging, the size distribution of standard particle board is measured, which indicates that the result of the measurement of particle size distribution is not affected by the simultaneous measurement of velocity.

分别在单光束和三光束照射测量点，其它条件不变的情况下，对标准粒子板的尺寸分布进行了测量，实验结果表明，粒子尺寸分布的测量结果不受同时测速的影响。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐