relative aperture 中文意思是什麼
relative aperture
解釋
口徑比-
Film 16 mm ; position of film relative to camera aperture ; position of reference perforation hole
16mm電影膠片.膠片相對于照相機快門的定位.基準穿孔 -
Optical system design for lens with relative aperture of 11
相對孔徑為11鏡頭的光學系統設計 -
Photographic lenses - methods for the measurement of the effective aperture, f - number and relative aperture
攝影鏡頭.有效孔徑光圈數和相對孔徑的測量方法 -
The relative aperture 1 : 2 is the limitation of the manufacturing and testing of aspherical surface by using traditional method
相對孔徑1 ： 2已是傳統非球面加工和檢驗的極限。 -
However, with the increasing of the relative aperture, it presents a austere challenge for manufacturing and testing technology
但是，隨著相對孔徑的增大，對加工技術和檢驗都提出了嚴峻的挑戰。 -
When the relative aperture reaches to 1 : 1. 3, it is necessary to use advanced manufacturing technology and equipments. the progress of testing conditions and methods is also certain
當相對孔徑達到1 ： 1 . 3時，必然需要先進的工藝製造技術和設備；檢驗條件和方法的進步也是完成這種鏡面製造的必然要求。 -
The unfocused aspherical surface system is one of the main structure of large emiting system. in the system, the more large the relative aperture of primary mirror, the more small the focal length and the tube of system, and the more light the weigth
這個系統中的主反射鏡的相對孔徑越大，其焦距就越短，相應地系統筒長就越短，重量就越輕，這樣就越能滿足車載或機載系統的實戰要求。 -
Firstly, the system is divided into many modules according to different point of view ; secondly, to the hardware equipment - vidicon, lenses, revolver, shield and decode device, their principle of work has been explained ; thirdly, according to image identification experience and other indexes of the system, the focus of the lenses and relative aperture are calculated, and the type of the camera is confirmed, at the same time, the energy of infrared lamp is also computed in the thesis ; at the same time, synthesis control box is devised
首先，按照角度的不同，將系統劃分成許多模塊。其次，對硬體設備? ?攝像機，鏡頭，雲臺，防護罩，解碼器等的工作原理進行了闡述，再次，以人的成像辨認的經驗判據為依據，結合系統的其它指標，設計計算出鏡頭的焦距f 、相對孔徑d ，同時確定攝像機的型號，並計算出紅外燈光源。最後，對綜合控制箱進行設計，指出了設計的意義，實現的功能，並附上了綜合控制箱的外形圖。 -
This paper describes a new method to select these parameters, including to determine the focus length, relative aperture and field of view of new optical system in design by means of making reference to previous star sensors and their optical systems ; to forecast the acquiring probobility of star sensor in accordance with selected param eters ; to determine the principal design wavelength and spectral coverage by means of integrat ing the spectrum of stars
本文介紹一種確定光學系統參數的新方法，包括通過參考比較已有星敏感器及其光學系統特性來選取新光學系統焦距、相對孔徑和視場；根據所選取的參數預計星敏感器的捕獲概率；採用綜合恆星光譜方法確定光學系統中心波長和光譜范圍。 -
This paper is a part of the project : research of manufacturing technology for unfocused aspherical surface system of large relative aperture, sponsored by national high technology 863 - 802. the purpose of this paper is deeply research the testing methods of primary and second mirror for unfocused aspherical surface, and to present the testing methods of primary mirror of the large relative aperture and transmission and reflected second mirror. the beam path diagrams and the relative design results are given in this paper
本文是國家高技術項目863 - 802的子課題「大相對孔徑無焦非球面系統製造技術研究」的一部分，其目的是對大相對孔徑無焦非球面系統的主鏡和次鏡檢驗方法進行深入研究，提出大相對孔徑主鏡和透射式及反射式次鏡檢驗方法，並給出檢驗方案和相關的設計結果。 -
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。 -
Inverse synthetic aperture radar ( isar ) imaging of non - cooperative maneuvering multi - target is a challenging task due to its time varying orientation and the relative motion among targets
摘要非合作的機動多目標相對于雷達射線的姿態是時變的，而且目標間可能存在相對運動，給逆合成孔徑雷達（ isar ）成像造成較大困難。 -
According to the existing studies of the basic law of fracture seepage, there are two sharp contrastive relations between seepage discharge and aperture : super - cubic and sub - cubic. similarly, there are also two opposite relations between seepage discharge and relative roughness : positive and negative relations
2 、現有的裂隙滲流基本規律的研究成果中，滲流量與隙寬出現兩種截然相反的關系：超立方和次立方關系；滲流量與相對粗糙度也存在兩種相反的關系：正相關和負相關關系。
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