超短焦距广角CID电视镜头的设计、制造与检测

舰船上直升飞机导降系统的CID电视小镜头 ,焦距只有 5 7mm ,视场为 90°。加拿大国内做得不够理想 ,其主要问题是弥散圆偏大。中科院西安光机所采用全部镜片都用普通光学玻璃的方案 ,精心设计制造了多批CID电视镜头 ,其技术指标完全达到了合同要求 ,加拿大客商倍加赞誉。首先叙述了CIDTV小镜头的光学设计、结构设计、加工和装校的要点。接着重点介绍了检测须过的“五关” :星点检验、近轴焦距、畸变、后截距和透过率测量。最后给出了CIDTV镜头的结果。     

CCD摄像型材料杨氏模量测量仪

叙述了利用电视显微技术测量材料杨氏模量的方法,介绍了研制的杨氏模量测量仪的使用方法及测结果评定。     

A microprism array as shearing device for speckle shearing interferometry

In most speckle shearing interferometers image shearing is performed by means of a Michelson interferometer or by means of a wedge prism covering half of the aperture of the camera objective. We present a speckle shearing interferometer which utilizes a microprism array for this purpose. It is placed between the test specimen and the camera. In comparision with a wedge prism it exhibits some advantages: it needs no exact alignment, it works with any camera lens, the shearing distance and direction of shearing can be easily changed by changing position (resp. angular orientation) of the element. Phase stepping for computer evaluation of the speckle shearing interferograms is performed by the translation of the shearing element. A special translation stage was developed. Experimental results are presented. The interferometer is suited for microcomponent and microsystem testing.     

Speckle photography combined with speckle interferometry

By combining speckle interferometry (SI) measurements with speckle photography, the fringe visibility can be kept high despite the presence of a large bulk or rotating motion of the object. This combined technique improves the usability and measuring range of both pulsed and phase-stepped SI-methods. This paper reviews the theory of fringe formation in SI and shows some recent applications of this combined technique.     

High-resolution time-average electronic holography for vibration measurement

Time-average electronic holography (also known as TV holography) is a widespread technique used in real-time, non-contact, whole-field vibration measurement. The quantitative interpretation of time-averaged fringe patterns is difficult because of speckle noise and of the decreasing visibility of higher-order Bessel fringes. Speckle noise may only be reduced during image acquisition, by multiple-frame averaging.The objective of this paper is to present two new methods allowing to obtain time-averaged fringe patterns presenting a high resolution and a high contrast between dark and bright fringes, as well as the associated quantitative interpretation. They are based on the elimination of the random phase component and on the reduction of the random intensity component of the time-averaged fringe pattern. The fringe patterns obtained by this method may be efficiently filtered in order to provide the precise locations of the Bessel-type fringes associated with the object vibration. The methods rely on the use of the simplest standard equipment, without any need for modulators or stroboscopic devices. Quantitative fringe interpretation is straightforward and based on the method of fringe skeletonizing and indexing. Fringe contrast is so high that skeletonizing may be done by simple thresholding.     

电视导引头跟踪系统物理建模与分析

对某型空地导弹电视导引头进行实测建模，通过建模和仿真分析，对系统提出改进意见。     

氧钒(Ⅳ)碱式碳酸铵的氨解和纳米VN的制备

氮化钒(VN)具有十分高的热、化学稳定性和强的机械性能,用于切削工具和结构材料。VN作为催化剂,具有高催化活性、高选择性、良好的稳定性和抗中毒性能;其催化行为类似Pt、Pd和Rh,是这些稀贵金属的经济的代用物。细的球状     

Tuning the contact resistance in organic thin-film transistors with an organic-inorganic hybrid interlayer

We demonstrated the tunable contact resistance in pentacene thin film transistor (TFT) by inserting an organic-inorganic hybrid interlayer between Au electrode and pentacene layer. The contact resistance of pentacene-TFT varies with concentration of pentacene-TFT varies with concentration of MoO_x in organic-inorganic hybrid interlayer. MoO_x in organic-inorganic hybrid interlayer. The contact resistance of the device with 55 wt% MoO_x doped pentacene interlayer is about 7.8 times smaller than that of device without interlayer at the gate voltage of −20 V. Comparing the properties of pentacene-TFT without interlayer, the performance of the pentacene-TFT with 55 wt% MoO_x doped pentacene was significantly improved: saturation mobility increased from 0.39 to 0.87 cm²/V s, threshold voltage reduced from −21.3 to −7.2 V, and threshold swing varied from 3.75 to 1.39 V/dec. Our results indicated that the organic-inorganic hybrid interlayer is an effective way to improve the performance of p-channel OTFTs.     

微光电视成像系统表征方法

 在分析微光电视成像系统的基础上，提出了适用于微光电视成像系统仿真所用的微光场景图像数据的要求及生成方法；针对第二代近贴聚焦系统和第三代像增强系统，建立了微光电视成像系统的能量增益理论模型；引入３维噪声理论模型表征了微光成像系统的噪声；最后，提出了微光电视图像噪声抑制算法的评价方法。仿真结果表明：经微光系统传递后，图像中的高频信息变模糊，加入噪声后，信噪比降低；而经过5帧平均算法后的图像质量明显改善，对比度增加。     

长焦距小型无热化电视光机系统设计

针对长焦距小型化电视的设计要求,采用摄远型光学结构压缩系统的轴向尺寸,使摄远比达到了0.53,并对系统进行了消杂光及光机无热化设计,通过合理地设置光阑减少系统的杂散光,选择合适的结构材料与光学材料相匹配,在整个工作温度范围（-40 ℃～+65 ℃）,像面漂移量在焦深范围内,20 lp/mm时系统的MTF在0.7以上,点列斑4.7 m,小于探测器的像元尺寸6 m,光轴稳定性达到了0.04 mrad,系统无需调焦便可满足高低温等恶劣环境下的像质和光轴稳定性要求。试验结果表明:探测和识别特定目标距离均达到了指标要求。