free aperture 中文意思是什麼
free aperture
解釋
自由孔徑-
This setup, known as a conoscope, is shown in figure 14. 2 and consists of two stress - free plane - convex lenses a and b and a diaphragm c having a small aperture
此裝置稱為錐光鏡，如圖14 2所示，它由a和b兩個無應力平凸透鏡和一個帶小孔的光闌c組成。 -
By inserting the barrel of an arruginated male key in the hole of an unstable female lock, obtaining a purchase on the bow of the key and turning its wards from right to left, withdrawing a bolt from its staple, pulling inward spasmodically an obsolescent unhinged door and revealing an aperture for free egress and free ingress
他將生銹粗澀的男性型鑰匙軸捅進反復無常的女性型鎖孔里，把勁頭使在鑰匙環上，自右至左地轉動鑰匙的凹，將鎖簧送回到鎖環里，痙攣般地把那扇鉸鏈都掉了的舊門朝裏面拽過來，露出可以任意出進的門口。 -
This setup, known as a conoscope, is shown in figure 14. 2 and consists of two stress-free plane-convex lenses a and b and a diaphragm c having a small aperture.
此裝置稱為錐光鏡，如圖142所示，它由A和B兩個無應力平凸透鏡和一個帶小孔的光闌C組成。 -
In the experiment, we use the he - ne laser and the semiconductor laser as the source, record the bessel beam patterns behind the axicon by using a digital camera and a microscope, measure the radius of the bessel beam central spot by film - scanning and measure the effect of both the radius of the aperture and the open angle of the axicon on the maximum non - diffraction distance. the experiments show that a specific propagating range has constant power and the beam has a bessel - like distribution in this range. the results agree with the beam corresponding to a diffraction free beam
同時我們還採用膠片掃描的方法測量了無衍射光束的中心光斑尺寸，測量了不同光闌孔徑和不同稜角情況下的最大無衍射距離和傳播軸附近橫截面內微小光孔中的光強，實驗結果顯示當激光光束經過軸棱錐轉換後有一段距離功率變化很小，且分佈近似貝塞爾分佈，符合無衍射光束的特性;經過聚焦后，呈現三維分佈中空的光束bottlebeam ，實驗結果與理論分析基本吻合。 -
Due to restriction with the array aperture transition time, traditional phased array radar works under relative narrow signal bandwidth, so this restricts the application of phased array radar in the field where high performance is demanded. however, optically controlled phased array radar ( ocpar ) adopts the photoelectron technology, counteracts the aperture transition time via the method of optical true time delay ( ottd ), so it can realize wide instantaneous bandwidth and squint - free operation ; meanwhile, it can realize the miniaturization of phased array radar and has super anti - electromagnetism interference capability
而光控相控陣雷達採用光電子技術，通過光實時延遲的方法來抵消孔徑渡越時間，可以實現相控陣雷達的寬帶寬角掃描;同時也可以使得相控陣雷達小型化，並具有強的抗電磁干擾的能力;另外，由於光纖傳輸具有損耗低、頻帶寬等固有優點，採用光纖連接雷達天線和雷達控制中心，可以使兩者的距離較採用同軸電纜有較大的提高，更有利於保護雷達控制中心。 -
We can approach the limiting case of free propagation by allowing the aperture dimensions to increase indefinitely.
讓孔的線度無限增大，我們就能趨近於自由傳播的極限情況。
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