The unsuspecting photographer focuses with the lens wide open to place the circle of least confusion at the sensor position b, and, taking the actual picture at a reduced aperture, he is unaware of the ensuing focus shift that prevents him from getting the best out of the lens.

一個(gè)經(jīng)常使用全孔徑來拍攝的攝影師會(huì)毫不猶豫地把膠片放在B點(diǎn)，但是如果他不改變膠片的位置无码啪啪网站，當(dāng)他使用小光圈的時(shí)候，事實(shí)上，他就不可能充分利用這個(gè)鏡頭拍到最好的照片了亚洲综合综合网。

First,the planar waveguide models for Rotman lens and its feed lines which incorporate the dispersion effect with frequencies are set up.Then the aperture electric fields at lens ports are expanded by appropriate waveguide mode functions and substituted into the contour integral equation.The multimode scattering matrix of the lens can be acquired by solving the contour integral equation by using Galerkin method.

首先建立了考慮色散效應(yīng)的透鏡的等效平板波導(dǎo)模型，然后選擇適當(dāng)?shù)牟▽?dǎo)模式函數(shù)展開透鏡端口上的場亚洲视频在线免费公开，并利用Galerkin法求解其邊緣上電場滿足的輪廓積分方程即可得到透鏡的多模式散射參數(shù)亚洲狠狠综合网站。

F-number: The figures marked on the lens collar to indicate the size of the lens aperture in relation to its focal length.

光圈值：刻劃在鏡頭上用來表示鏡頭孔徑與焦距關(guān)系的比值人人爽人人爱人人干人人摸。

The ratio of the focal length of a lens or lens system to the effective diameter of its aperture.

光學(xué)儀器的目鏡上的細(xì)線、圓點(diǎn)久久免费妇女高潮看片A片、十字型細(xì)線或金屬絲組成的系統(tǒng)就爱干人干人操。

The latest experimental results of the focusing perfermance of the compound high-energy X-ray lens is designed with PMMA with the parameters of 40 plano-concave elementary lenses positioned in line with axial symmetry, 200 μm radius of the concave surface, 0.15 nm working wavelength, 0.5 mm geometrical aperture and 8 mm length of the compound lens and 1.3 m focus length, are briefly introduced.

報(bào)道了這種新型X射線光學(xué)元件聚焦性能的最新實(shí)驗(yàn)結(jié)果。設(shè)計(jì)的高能X射線組合透鏡為聚甲基丙烯酸甲酯材料亚洲爱爱小视频，包括40個(gè)相同的色哟哟无码一区二区、順序排布的平凹折射單元，折射單元的球面半徑為200 μm精品日韩中文字幕，組合透鏡的幾何口徑約為500 μm亚洲网在线，長度約為8 mm，焦距約為1.3 m一级a毛片水多视频国产一。簡要描述了PMMA材料X射線組合透鏡的制作技術(shù)和制作過程三级网站午夜三级60分。并給出了X射線組合透鏡聚焦性能測試實(shí)驗(yàn)系統(tǒng)和實(shí)驗(yàn)條件。

It is found that the bright points distributed regularly adjacent to main facular is spectral distribution on the focal plane of the array of lens when the laser irradiates a hexagonal aperture,rather than what is induced by stray light.

結(jié)果表明欧美色图亚洲色图在线，主光斑附近規(guī)則分布的亮點(diǎn)并不是由雜散光引起的www,五月天,com，而是激光輻照六邊形光闌，在透鏡組焦平面所成的頻譜分布香港经典a毛片久久免费观看2。

Based on the expression of diffractive field distribution of the Gaussian beams restricted by a rectangular aperture and focalized by a lens,the relationship between the width of the rectangular aperture and the spot size of the restricted beam,as well as the relationship between the aperture width and the power in the bucket,was numerically calculated with MATLAB.

為了研究矩形光闌邊長與透鏡像方焦面處光束光斑尺寸以及光斑內(nèi)所包含功率的關(guān)系欧美性交片视频，根據(jù)高斯光束經(jīng)矩形光闌和透鏡變換后在透鏡像方焦面的衍射場分布表達(dá)式，采用MATLAB進(jìn)行數(shù)值計(jì)算的方法先锋久久中文，進(jìn)行了理論分析国产色福利影院。

The lens-less pupil works rather like the aperture of a pinhole camera.

這種沒有透鏡結(jié)構(gòu)的瞳孔更像是針孔相機(jī)的孔。

Based on the relationship between the numerical aperture of the objective lens and scale pitch, this study chooses a suitable Plano-convex lenses available on the market, so as to approximate the diameter of the focusing spots to scale pitch. Also, by using the optical path of an optical encoder similar to the nanoscale, the changes in the surface profile of the scale can be measured directly, so as to obtain the two quadrature sinusoidal signals. By counting the zero crossing of these two quadrature sinusoidal signals and calculating the interpolation value of these two quadrature sinusoidal signals, the moving direction and moving displacement value of the scale can be obtained.

研究中再以搭配物鏡的數(shù)值孔徑與尺條間距的關(guān)系爱爱视频在哪里考，選擇ㄧ適當(dāng)?shù)氖惺燮酵雇哥R天堂视频网站，使聚焦光點(diǎn)的直徑與尺條的間距相近，并使用相同於奈米級(jí)長行程雙雷射聚焦讀頭裝置的光路設(shè)計(jì)黑人一级婬片A片免费无码，如此將可藉由直接量測尺條的表面輪廓變化jizzg，以獲得一組正交弦波訊號(hào)，繼而利用訊號(hào)四分割與細(xì)分割處理古装观看一级古装A片，計(jì)算出尺條之移動(dòng)方向與移動(dòng)量超碰碰人人摸97，研制出一實(shí)用性長行程雙雷射聚焦讀頭光學(xué)尺。

The original technology is based on the far-field optical but all of them are restricted by Rayleigh diffraction limit.In order to break optical diffraction limit restrictions, people improve recording density in three ways:(1) shorten wavelength of light,(2)increase numerical aperture of the lens N.A.

不過上述儲(chǔ)存方式所采用的記錄技術(shù)皆是在遠(yuǎn)場光學(xué)的領(lǐng)域內(nèi)网站欧美黄色免费，在遠(yuǎn)場光學(xué)的繞射極限下亚洲中文久久精品无码，要持續(xù)提升記錄密度的方法有三種；(1)縮小光源波長(2)提高透鏡的數(shù)值孔徑