Two methods and devices which are changeable aperture and movable aperture for measuring the mode-field radius of single-mode optical fibers are presented.
介绍两种快速测量单模光纤模场半径的方法及其测量装置——可变孔径法和移动圆孔法;即用步进电机带动在光纤端面远场区域放置的一个透光圆孔屏障移动,或者改变透光圆孔的大小,从而调节PIN管接收到的光强度。
Preparation and processing of porous hydroxyapatite ceramics with controlled pore sizes;
孔径可控的多孔羟基磷灰石的制备工艺研究
variable hole fruit grader
可变孔径的水果分级机
magnetic transmission variable aperture flow meter
磁力传动可变孔径式流量计
The human eye has a pupil diameter which, of course, varies.
人眼瞳孔直径当然是可变的。
Preparation and Synthesis Mechanism of Mesoporous La-Co-Ce-O Oxide with Adjustable Pore Size
孔径可调介孔La-Co-Ce-O氧化物的制备及孔径调节机理研究
Gas drainage in seam with large auto variable diameter bore holes
自动变径大直径钻孔抽放煤层瓦斯试验
The Study of Change Detection Technology with Synthetic Aperture Radar Images;
合成孔径雷达图象变化检测方法研究
Internal friction behaviors of porous NiTi alloys with variable porosities
可变孔隙率多孔NiTi合金的内耗行为
A Study on the Effect of Soil Layer Nature and Drilling Machine on Variation of Cavity Diameter of Cast-In-Place Bored Piles
土层性质及成孔机具对钻孔灌注桩孔径变化的影响
In practice the surfaces of interferometer plates cannot be worked perfectly plane, and in consequence the plate separation h always varies over the aperture.
实际上，干涉仪两板表面不可能加工得完全平，因而板的间隔h在孔径范围内总是改变的。
Study on Pore Size Adjustable Porous Glass and Its Integration with Cavity Hole-arrayed Substrate;
孔径可调多孔玻璃及其与空穴孔阵基板的复合研究
Drag onto the page. Right-click to show or hide bore.
拖到绘图页上。右击可显示或隐藏孔径。
Preparation and Properties Research of Pore-Size Controllable Carbon Membrane;
具有可控孔径的炭膜制备与性能研究
condenser aperture
聚光镜孔径;聚光镜孔径;聚光器孔径;聚光器孔
Denoising Synthetic Aperture Radar Image via Wavelet Transform
基于小波变换的合成孔径雷达图像降噪
The Pore Size Change of Polysulfone-Fe_3O_4 Composite Ultrafiltration Membrane in the Magnetic Field
外加磁场下聚砜-Fe_3O_4复合超滤膜的孔径变化
Application of Changing Chirp Rate Sign in Eliminating Range Blur of SAR
变线性调频斜率符号在合成孔径雷达中的应用
Experimental Study of Particle Distributing Performance on Variable Aperture Particle Distributor
变孔径颗粒分布板的颗粒分布性能实验研究
Synthetic Aperture Sonar Image Reconstruction with Variational Non-Uniform Sampling in Azimuth
方位向时变非均匀采样的合成孔径声纳成像