新型单帘航摄焦平面快门

快门是控制感光介质曝光量的重要组件,为使航摄快门适应面阵CCD相机对空间结构上的要求,同时做到幅面曝光时间均匀、曝光时间调节范围大、并且曝光时间连续可调,设计了新型帘幕式快门。在分析了快门的曝光原理的基础上推导出快门有效曝光时间计算公式,并结合快门的有效曝光时间计算公式设计了单帘式快门,采用帘幕环绕面阵CCD的快门结构形式,快门帘幕采用四辊轴的结构形式,并利用正时带实现了快门的曝光功能,利用高斯误差合成对快门系统的精度进行了分析计算,得到系统的曝光精度为0.057。实验结果显示,快门能够实现1/50~1/250 s的曝光时间调节范围,通过光电法实验测得快门的曝光精度达到0.056,满足0.1的曝光精度指标要求。     

快门眼镜式双视角显示系统实现方法

文章研究了快门眼镜式双视角显示原理,提出了一种适用于240Hz的快门式双视角液晶显示系统。     

988电子程序快门电路的检查和修理

配有电子程序快门的照相机,可根据实拍景物亮度,按预先设定的程序,调节光圈的大小和控制快门开启时间,实现自动爆光。988电子程序快门与日本SEIKO ESF—G988电子程序快门的性能相同,是一种曝光准确、功能完善的电子程序快门,因此在国产相机中得到较广泛使用。如红梅AEC—35、甘光JG304C、青岛6型等照相机,都采用这种电子程序快门。     

CCD航空相机用长寿命帘幕式快门

CCD型航空侦察相机由于存储量大,一般每次可拍摄数千张图像,快门曝光次数频繁,因此对其工作的可靠性和使用寿命提出了更高的要求.设计了一种新型高可靠性、长寿命帘幕式焦面快门,帘幕采用金属的钛箔材料,无需齿轮组传动,克服了传统的该类型快门的诸多弊端,保障了帘幕快门的使用寿命;且通过DSP控制整个系统,提高了控制精度.实验结...     

维修集锦

理光XF-30D相机不曝光的检修故障现象:使用过程中不曝光。分析检修:首先打开暗室后盖,将相机对着光亮处,按动快门,观察快门是否动作或动作时间是否过短,结果发现快门根本不动作;然后拆开相机后盖,按动快门观察电磁铁是否动作,发现电磁铁正常动作,只是快门打不开。这说明电路部     

照相机常见英文释义

,,止吸l硫几有七n月全称缩写意义AEL《芜KAEL自动曝光锁定档标志AutoA砂rtunePriority此标曝光丁已在快门度盘上表示光圈优先自动当标志AU IUAAUTOMATIC刻在快门调节钮上,表示自动快门档Auto shutter SPeedPriorityAUTOS刻在光圈度盘上,表示快门优先自动曝光档Br ight Line FinderBLF表示亮框取景器CLEAR消除档标志,拨至此档可清除照相机记忆的曝光信号Dan FanDF表示国产单镜头反光焦平面快门照相机Eleetronie FocusControl SystemEFS表示电子调焦系统Eleetronie ProgramShutterEPS表示此快门为电子程序式快门Expo…     

DIY佳能EOS 3000快门线

经不住数码单反相机的诱惑，笔者于两个月前购入了佳能(Canon)EOS 300D(以下简称300D)数码相机。然而一段时间后，笔者渐渐觉得10秒的等待实在有些漫长——由于笔者经常利用慢速快门拍摄夜景和流水，为了避免按动快门时手的动作造成画面的抖动，因此往往采用10秒自拍的方式进行拍摄。于是，笔者决定再为300D添置一根配套的电子快门线。然而寻找这种型号为RS 60-E3的快门线并不顺利，笔者所在的城市根本没有销售。百般无奈之下，自己动手制作一根300D的快门线的想法便油然而生。在看了该快门线的图片后，感觉这个东西应该并不复杂。经过一段时间的资料收集，证实了自己的猜想——自制快门线是完全可行的。如果你也拥有300D，也为购买不到快门线而苦恼，那还犹豫什么，一起来DIY快门线吧!     

空间望远镜大尺寸快门寿命试验研究

针对空间环境下的大面阵光学望远镜的大尺寸快门,设计了一种关于空间环境的高保真寿命试验方案.该方案以大口径真空罐为平台,充分考虑了大尺寸快门在空间运行时面临的复杂环境因素,为其提供了极为真实的在轨运行环境.针对该快门在轨开合100万次的寿命指标,设计了具体的试验方案,并搭建了高保真空间环境试验平台,利用加速寿命试验的原理使快门机构在真空罐中运行.结果表明该试验方案可为快门提供极为真实的空间在轨运行环境,能够支撑其完成100万次的开合动作.     

高分辨率双快门模式CMOS图像传感器控制电路的设计与仿真

主要介绍了一种可用于空间信息获取的高分辨率双快门模式CMOS图像传感器,分析比较了该CMOS图像传感器卷帘式和同步式两种快门模式的工作原理和特点,设计了两种快门模式的时序控制电路并进行了仿真和验证,结果表明了控制电路设计的正确性,并可适用于空间微纳型卫星的成像系统。     

全局快门CMOS图像传感器研究进展

全局快门CMOS图像传感器广泛应用于高速运动物体的成像,包括机器视觉、工业测量、航空航天,以及军事应用等领域.介绍了全局快门CMOS图像传感器的主要类型,具体分析了灵敏度、寄生光灵敏度、读出噪声、动态范围和帧频等性能参数的研究进展.最后对国内外有代表性的全局快门CMOS图像传感器产品进行了介绍.     

光开关玻璃的飞秒光学开关特性

通过在碲玻璃中添加重金属离子,尝试制作了具有较大的非线性折射率、时间响应快、吸收小的光开关玻璃。采用超快飞秒光克尔门技术对光开关玻璃的光克尔信号进行测试,测试结果显示,光开关玻璃的光克尔信号对称性好,信号半高宽度达到~225 fs,三阶非线性极化率达到~0.810-20 m2/V2,透过率达到70%~80%;研制的光开关玻璃为皮秒和飞秒光开光材料的选取提供了依据。     

CMOS image sensor with NMOS-only global shutter and enhanced responsivity

Most CMOS image sensors today use the rolling shutter approach to control the integration time. This pixel architecture is advantageous where minimal pixel size is required to increase resolution or reduce over all chip size. For imaging of a fast moving object or when used with pulsed illumination, the rolling shutter approach is not suitable since it leads to severe distortion. Therefore, these applications require image sensors with a global shutter pixel architecture, which incorporates a sample-and-hold element in each pixel. Due to the optical exposure of the in-pixel storage element, shutter leakage is critical. First approaches which use separate wells in the pixel to isolate the storage node from the photodiode showed good shutter efficiency, but are bulky and led to large pixels with poor fill factor and bad responsivity. This paper presents an NMOS-only pixel with a global shutter and subthreshold operation of the NMOS sample-and-hold transistor to increase optical responsivity by a factor of five to 9 /spl upsi/V/photon, including fill factor.     

Integrated electronic shutter for back-illuminated charge-coupleddevices

A novel electronic shutter has been integrated into the structure of a back-illuminated frame-transfer charge-coupled device (CCD) to permit short optical exposure times and to reduce the smear that occurs during the transfer of an image from the CCD detection area. The shutter consists of an n⁺ shutter drain placed in the vertical channel stop regions and stepped p-type buried layers formed by a high-energy implantation (1.0-1.5 MeV) located between the CCD n-type buried channel the and p substrate. These structures create electric fields that direct the photoelectrons to either the CCD detection region or the n⁺ shutter drain. The ratio of photons detected with the shutter open to photons detected with the shutter closed has been measured to be greater than 75000 for wavelengths below 540 nm. The corresponding shutter rise and fall times are less than 55 ns     

Optical Kerr shutter using organic nonlinear optical materials in capillary waveguides

Fundamental experiments conducted on optically gated optical switches using organic materials with large optical nonlinearities are reported. An optical Kerr shutter was constructed, whose main part is a long-length and miniature-core glass capillary, filled with a solution of charge transfer organic material of 4-(N,N-diethylamino)- beta -nitrostyrene (DEANST). The capillary waveguide made it possible to enlarge the medium length and to reduce the beam diameter, realizing about 10/sup 4/ times greater efficiency than the conventional CS/sub 2/ optical Kerr shutter using a 1-mm thick cell. A response time of 4 ps was observed and gating power was reduced to 10 W.<>     

Optical Kerr shutter performance of a solution of organic nonlinearoptical material

An optical Kerr shutter with much higher efficiency than the conventional CS₂ liquid is demonstrated, utilizing a solution of π-conjugated monomer material. Third-order nonlinear optical susceptibility χ⁽³⁾ of the solution is evaluated by the efficiency of the Kerr shutter operation. The χ⁽³⁾ value of the solution depends on the molecular density, the molecular orientation behavior, and the dielectric constant of the solvent. To utilize these effects most efficiently, 4'-dimethylamino-N-methyl-4-stilbazolium methylsulfate is dissolved in formamide to the saturation concentration. This results in χ⁽³⁾ =3.0×10^-12 esu and a Kerr shutter transmission of four times that of CS₂     

A novel optical accelerometer

A novel accelerometer based on a PIN photo-detector and a micro-machined cantilever-beam-supported optical shutter with seismic mass has been designed, fabricated, and tested. Anisotropic wet etching of 〈110〉 orientation silicon in KOH is used to fabricate an optical shutter consisting of evenly spaced vertically etched slots. The shutter, which also constitutes the seismic mass of the accelerometer, is suspended by two cantilever beams. The special structure of the device and the high aspect ratio of the cantilever beams (7.5) permit freedom of the movement for the proof mass (the shutter) on the ±X axis only. The actual size of the device is 3×4 mm and its amplified output varies linearly from -3.6 V to +3.6 V for accelerations from -84 g to +84 g. The measured resonant frequency of the device is 3.2 KHz. A dual diode structure is chosen for the photo-detector to compensate for temperature drift and the amplified output voltage changes by less than 40 mV for a temperature variation from 25°C to 50°C     

非功能式光纤传感器设计基础（二）：调制方式及其理论分析方法

讨论了三种强度外调制的基本形式，即透射式、反射式和光闸式。在纤端光场分布函数的基础上，建立了相应的理论分析方法，并推广到光纤束传感器。最后给出了二则分析实例。     

Ferroelectric liquid crystal device for a single camerastereoscopic endoscope system

A camera and display system is described that takes stereoscopic pairs of images through a standard single lens endoscope. A ferroelectric liquid crystal shutter is used to change the optical path to a CCD camera to capture left and right images. Sequential display of the two images and FELC shutter glasses are used to present the left and right images to the user     

高性能三分幅相机的研制及应用

高性能的分幅相机是强流脉冲电子束束参数测量及加速器调试中必不可少的一部分,为了满足这种要求,研制了一种新的高性能超高速的三分幅相机。该分幅相机采用一种成像质量较好的会聚光成像的全口径分光原理,由高速快门、科学电子耦合组件(CCD)相机及高速的控制器等组成,具有快门时间和幅间时间独立控制的能力,灵活的控制方式很好地满足了各种测试要求,并且在有效像面面积达到?25 mm的情况下可以获得约3 ns的最高快门速度和高于30 lp/mm的像面空间分辨力。