光束

The detection concept for large diameter beam parallelism with penta prism is introduced.

介绍了用五棱镜法检测大口径光束平行度的原理。

At the end, an example is given to illustrate the detection of the parallelism error of a single star simulator with penta prism.

最后，给出了用五棱镜法检测单星模拟器出射光束平行度的应用实例。

Because more control can be obtained via binary pixelated arrays of metal pixels, as used on the National Ignition Facility to precompensate for the spatial gain variation of large glass amplifiers, we intend to adopt the binary mask method to spatially shape the Gaussian laser beam in "ShenGuang II" laser driver system.

结合目前神光II的工程需求，我们拟采用美国劳伦兹·利弗莫尔国家实验室在国家点火装置中使用振幅型二元光学面板技术，将高功率激光驱动器预放系统输出的光束按照具体需求进行精确整形。

It is demonstrated that the frequency drift will break up the phase-locked state of the laser array and induce the spatial instability of the far-field intensity due to phase noise. It is also found that although the evanescent coupling between elementary lasers can restrain these effects to some extent, the restrainability is too limited to be effective when the frequency drift is relatively strong.

通过对耦合激光器阵列动力学方程的数值研究发现，频率漂移将破坏激光器阵列的锁相状态，并引入相位噪声，导致输出远场光强分布不稳定；研究还发现：倏逝波耦合能够对频率漂移的影响起到一定的抑制作用，但这种抑制只在频率漂移较弱时才有效，因此，如果将该阵列用于光束合成，加入相应的抗干扰措施还是很必要的。

The sensors are available in through-beam, retroreflective and proximity models for performing object detection.

该传感器可通过光束，反光和接近模型的表演目标检测。

And also, we have done some researches on the Fresnel number of polygon slits, high efficient retroreflective film, the superluminal and/or subluminal velocities of beams in vacuum, the zero-field truncation technology, fractional Fourier transforms and so on.

同时，开展了多边形光阑菲涅耳数、高效逆向反光膜、真空中光束的超光速与亚光速现象、零场截取技术、分数付里叶变换等相关领域作了研究。

Astronomers discovered a pair of neutron stars locked in orbit of each other and spewing out beams of radiation.

天文学家发现一对中子星锁定在轨道上，相互借鉴，喷涌出光束的辐射。

Results show that the difference referred above caused by the different summations and shapes of superposed areas on beam path.

结果表明，产生上述差异的主要原因是由于两种光路中光束交叠区域大小和形状不同引起的气体热效应产生的附加相位有所不同。

The collimation and focus systems discussed in this paper are the important components of the synchronal radiation equipment which can change the direction of X ray and focus it.

同步辐射是生物大分子研究中所使用的重要方法，本文讨论的准直镜和聚焦镜系统是生物大分子光束线中的重要装置，其作用是改变X射线的方向并使其聚焦。

In this dissertation, we selected a lot of actual aerial photographs, which use as surveying and mapping the topographic maps at the scale of 1:500～1:50000, with airborne GPS data taken from five projects which include all type of topographics from flat to mountain in China were processed by our GPS-supported aerotriangulation.

经采用自行研制的两个软件GPSkin和WuCAPS〓进行GPS辅助光束法区域网平差，获得了满足我国现行《航空摄影测量内业规范》的加密结果。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。