光束

Analytical Propagation Expressions of Hyperbolic Secant Pulsed Beams with Narrowband and Broadband.

窄带和宽带双曲正割脉冲光束的解析传输式。

The homocentricity of the reflectional and refractional light beam on the rotational hyperboloid is studied .

研究了光在旋转双曲面上反射与折射光束的单心性，正确得到了其近轴成象的一般公式，给出了应用举例。

Using two-dimensional finite-difference time-domain method, the optical fields of solid immersion lens are studied when illuminated by focusing gauss beam.

采用二维时域有限差分(2D-FDTD)方法研究了高斯光束通过固体浸没透镜的光场分布特性。

And that, most investigations are based on perfect beams and optical systems, but in the actual work, owing to diversified imperfectness, there exist aberrations effect in beams or optic systems more or less.

光束聚焦特性的进一步研究对激光束的应用和光学系统的设计有着极大的实际意义。

The corona's rays flash out in a brilliant fan that has wispy spike-like rays near the Sun's north and south poles.

光环带的光束像一把流光折扇，在太阳的南北两极附近形成纤细的辐射线。

Three factors of restraining speckle noise in detection system, coherence ,phase difference and polarization of the incident ray,were analyzed in detail, and the relations between these factors and speckle contrast were also presented.

对采用激光照明的测量系统中散斑形成的三个重要因素，即入射光束的相干性、相位差和偏振特性进行了详细的理论分析，并给出了这些因素与散斑对比度的变化关系。

The maesurement errors in the laser collimation are mainly caused by the light beam drift, the light beam incurve and the light beam random tremble.

论文中对长距离激光准直光束特性进行了较详细的实验研究和理论分析认为，影响其准直精度的三个重要因素是光源漂移、光线弯曲和随机抖动。

However, the Lateral Shear Interferometer can realize the two kinds of measurement, and it is the better tool for aero-optical test. For ordered aberration, it is deduced and simulated that the ability of wavefront reconstruction of LSI is better than Hartmann Wavefront Sensor , for the indirect sampling information of wavefront with LSI is more than HWS.

进一步分析了随机扰动和有序扰动的测量方法，指出在两种扰动同时存在的条件下，横向剪切干涉仪可以同时对两种扰动进行测量，因而是近场测量气动非均匀介质对光束质量影响的较好的研究方法。

A method to acquire and track the beacon for deep space optical communication system is proposed, which uses star as beacon, and controls the direction of down beam based on the absolute position in inertial frame, the ephemeris of aircraft and earth and the attitude of aircraft.

提出一种深空光通信系统的信标捕获、跟踪方案，该方案是以恒星作为信标，根据恒星在惯性坐标系中的绝对位置信息，基于航天器和地球星历表、航天器的姿态信息来进行下行光束瞄准方向的精确控制。

Based on the actual experience, discusses how to decide the rational height of the infra-red radiation detector in the huge span steel-building, and it also talks about some advice to the current codes.

结合实际工程实例，阐述在大跨度钢结构建筑中如何确定红外光束火灾探测器的设置高度，并针对现行国家规范相关条文提出建议。

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％。