Objective aperture

Applying the electron-diffractive mode of transmission electron microscope ( TEM ), an objective aperture with a proper diameter was used to select the diffractive area of non-crystal SiO_2 for taking the dark field images of SiO_2-cladding nano-CaCO_3 , produced by the sol-gel method .

在透射电子显微镜（TEM）电子衍射模式下，用适当孔径的物镜光阑选择非晶态SiO2的衍射区域，拍摄以溶胶-凝胶法制备的SiO2包覆纳米CaCO3的暗场像。

Design of a fore-optical objective with large relative aperture for spectral imagers

一种大相对孔径成像光谱仪前置物镜设计

The highly focused laser beam was obtained by use of the objective with high numeric aperture , and the fluctuant fluorescence signals were collected by a sensitive single photon counting module .

采用高数值孔径物镜使激光束高度聚焦，并用同一物镜收集样品的荧光，单光子计数器用于实时记录荧光信号。