This sensor featuring plane-convex lens collimator for expanding beam and coupling, and a low frequency for light pulse modulation is introduced.
利用平-凸透镜准直器作扩束耦合光学系统，采用低频斩光器实现光调制。
Through the analysis of pile bottom grouting and beam expanding accident methods and principles, the engineering practical examples are summarized.
通过对工程实例的剖析，介绍桩底后注浆和扩大承台(梁)法等桩基事故处理方法和原理，作为工程实践经验的总结。
The conclusion is: a practical beam expanding telescope has maximum beam expanding ratio when its maladjustment is zero.
其结论为一个实用的扩束望远镜在失调量为零时，具有最大的扩束比。
The optimum design of low loss beam expanding prism system is suggested.
提出了扩束棱镜透过性能的最优设计方法。
Based on matrix optics, the relationship between maladjustment and expanding ratio of the laser beam expanding telescope has been analyzed in this paper.
本文利用矩阵光学的方法，分析了扩束望远镜的失调量与扩束比之间的关系。
Some laws obeyed by the beam expanding by use of the thin lens are discussed.
讨论了用薄透镜扩束时应遵从的规律。
Therefore, the beam expanding just means to expand the waist and not the beam size.
同时指出扩束应是扩展腰粗而不是光斑尺寸。
In this paper, the propagation of Gaussian beams in a telescope system is analysed by using beam transformation formulas. The maximum beam expanding ratio is discussed.
本文利用光束变换公式分析了高斯光束通过望远镜系统的传播，讨论了最大扩束比问题。
The demand up to the year 2000 can be satisfied by improving quality and raising the weight of rails and by expanding existing rail-and-beam mills.
提高重轨质量和单重以增加列车载重和车速，扩建现有轨梁轧机，可以满足2000年前需要。
The demand up to the year 2000 can be satisfied by improving quality and raising the weight of rails and by expanding existing rail-and-beam mills.
提高重轨质量和单重以增加列车载重和车速，扩建现有轨梁轧机，可以满足2000年前需要。
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