焦距

The influence of the focal length in focal lens on the bottle radius and bottle length is discussed.

讨论了聚焦透镜的焦距f对径向暗域最大尺寸及轴上暗域长度的影响。

It's M2 factor is approaching the ideal value 1 and the beam intensity profile remains Gauss Profile. Laser beam with good propagation and focus characters. The beam can propagate a long way and can be focused with lens with long focal distance. The focal beam waist radius is 134μm, the focal distanced of the focus lens is 300mm. It's focal depth is about 5mm and the focal shift is about 1mm in the range of processing (3m).

结果表明，Slab CO2激光器具有高光束质量，其M2因子非常接近1的理想值；激光束具有良好的传输和聚焦性能，可以长距离传输；使用焦距为300mm的聚焦镜聚焦，聚焦光斑的束腰半径约为134μm，光束横截面能量分布接近理想的高斯分布，焦深约为5mm，在加工范围内(3m)，激光束的焦点漂移量大约为1mm。

Adjust the focal length depends on the surface membrane surface tending, quadrochromatic, quadrochromatic type, hole size, magnification, and so on.

焦距调度存决于滚筒暗地草稿药膜背的朝向、草稿典范榜样、平孔巨细、不扩不小倍率等。

This method is proved feasible from a design example,it also shows that designed system is simple and compact and easy to fucus for zoom lens with large aperture.

标 签 变焦距物镜光学系统大口径成像质量 zoom lens optical system large aperture imaging quality

At present, optical precision instruments, including high-precision digital Autocollimator, goniometer, automatic optical focal length of the device, eccentric parallel devices and fluorescent tubes, etc., while providing for the optical, infrared and mechanical measurement of the field of customized products and programs, through international ISO9001 quality certification system.

目前光学精密仪器包括高精度数字式自准直仪、测角仪、全自动光学焦距仪、偏心仪及平行光管等，同时提供针对光学、红外及机械测量领域的定制产品和方案，通过国际ISO9001质量认证体系。

Imaging quality of a single mirror and two mirrors in the case of grazing incidence is discussed. The focal length, field obliquity and diaphragm position of KBA microscope are analyzed.

详细分析掠入射情况下单镜及双反射镜的成像特性，对组成KBA显微镜的反射镜在掠入射条件下的焦距、视场倾斜、光阑位置等进行研究。

It increases with the increase of the half open angle.

焦距相同的飞行器，半张角大的冲量耦合系数大。

Parabolic crafts with various geometry parameters are analyzed on this method. The calculated results show that the half open angle of craft affects the coupling coefficient of momentum.

计算结果显示飞行器获得的冲量耦合系数和飞行器的半张角有关，半张角相同的飞行器，焦距大的冲量耦合系数要大。

Aluminum foil in polychromatic overprinter photoelectricity scanner tracking color standard position correction and manipulation of order: first switched on automatically overprinter the total power switch device, open the channel computer power supply and track scan power, photoelectricity scanning head alignment reflector and adjust the distance from far and wide, so that the reflector to be rendered on the minimum light point, at which point the detection distance of about equal to the focal length of the photoelectricity scanning head.

铝箔众色套印洋差平电扫描器跟踪色不本场所订侧和操纵挨次为：不后不切断被迫套印安装的总电源开关，开放各通道计算机的把持电源和跟踪扫描电源，不兵平电扫描脚差准不直射不活，调度远近间隔，使不直射不活上表现的平不面最小，此时的检测间隔约即是平电扫描脚的焦距。

Simulation result shows that a solar furnace using an 8m×8m non-imaging focusing heliostat with 289 mirrors coupled with a spherical concentrator with 0.7m aperture and 27cm focal length is capable of achieving flux concentration of 25,000 suns.

模拟结果显示，使用由289块子镜组成的8m×8m的非成像聚光定日镜的太阳炉，配合一个0.7m口径，焦距27cm的球面二次反射镜，可以达到25，000个太阳的聚光效果。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。