lens n. (pl. lenses) 1.透鏡;一組透鏡。 2.【解剖學】(眼球的)晶體。 3.【攝影】(照相機的)鏡頭。 4.凸透鏡狀物件;汽車的燈玻璃。 5.【礦物】透鏡狀油礦;扁豆狀礦體。 6. 隱形眼鏡(=contact lens)。 a concave [convex] lens 凹面[凸面]鏡。 an electron lens 電子透鏡。 a biconcave [biconvex] lens 雙凹[雙凸]面透鏡。 the power of a lens 透鏡的焦強。
Now , since the aperture can only be inserted in the one fixed plane it follows that the first image should be formed in this plane and the diffraction lens focused on to it 現在,由于孔可以僅僅被嵌入所屬的一個指定的平面,第一成像就應該出現在這個平面并且衍射透鏡聚焦在其上。
In addition to the rotation associated with the reduction in the strength of the diffraction lens there can also be an inversion between the diffraction pattern and the corresponding micrograph 除了通過衍射透鏡磁力縮減取得的旋轉,還可以有一種衍射模型和對應的顯微圖之間的倒置。
As mentioned above , to image the diffraction pattern it is necessary to reduce the power of the diffraction lens by altering the current through the lens coils from the value used to form an enlarged image of the first image 如上所言,要成像衍射模型就必須縮減衍射透鏡的能量,通過改變從已有形態到形成第一映像的放大映像過程中穿過透鏡圈的能量實現。
An inverted image is formed in the first image plane and the three subsequent lenses in the namely the diffraction lens , the intermediate lens and the projector lens are used either to magnify this image or to magnify the diffraction pattern 在第一映象平面出現一個倒的圖象,隨后的第三透鏡也就是衍射透鏡,中間的透鏡和投影透鏡被用來放大圖象或者放大衍射模式。
This is achieved experimentally by focusing the selector aperture on the final screen using the diffraction lens , which is most accurately done after removing the objective aperture , and then ( after replacing the objective aperture ) focusing the specimen using the objective lens only 這已經通過使用衍射透鏡在最終屏幕上聚焦選擇孔實驗性的完成,此方法多數能在移動目標孔后準確完成,然后(重置目標孔后)僅通過目標透鏡聚焦樣本。
For example , if the diffraction pattern is defocused by under - focusing the diffraction lens then the image of the specimen can be seen in both the direct and diffracted beams in the diffraction pattern and , since under - focusing the diffraction lens images a plane above the diffraction pattern , these images will not be inverted with respect to the diffraction pattern 比如,如果衍射模型是通過衍射透鏡下焦散焦的,樣本的映像就能在衍射模型中直接的衍射束中看到,但是由于衍射透鏡下焦在衍射模型之上平面成像,這些映像就不會對應衍射模型倒置。