搜索结果: 151-165 共查到“知识库 光学仪器”相关记录861条 . 查询时间(2.721 秒)
Design and Analyses of a Planar Zoom Module as a Beam Expander
planar zoom module beam expander planar optics planar integrated free space optics diffractive optics
2011/11/25
A novel planar zoom module (PZM) is presented in this article. The PZM is realized by integrating optical elements on its surfaces with the folding optical axis and performing the zoom function by tra...
Quantitative phase retrieval with a sub-100-nm resolution is achieved from micrographs of a zone plate based transmission x-ray microscope. A plastic zone plate containing objects of sizes from microm...
宽视长距连续变倍体视显微镜XYH-3A(PXSVI-E)
显微镜 物镜倍数 目镜
2011/11/24
PXS VI-E是一种用三目观连续变倍显微镜，其明显见长之处较其他机型相比，在不影响双目观察的同时亦能使用CCD数码摄像装置。E型机并可通过视频设施与电脑，监视器，电视机视频端子连接。并具备运用各种软件的功能，也可配制数码相机进行摄像。该仪器性能可靠、操作方便且外貌美观，不仅可做教学示范、物物解剖、公安部门做观察分析，还可做电子工业精密零件装配、农业上的种种检查等。
三目连续变倍体视显微镜XTZ-E
显微镜 电子工业 地质考古 目镜
2011/11/24
该仪器广泛应用于电子工业和精密机械工业做产品的装配和签验，由于有很高的分辨率及大视场范围的清晰度因此特别适合显微摄像及观察不规则物体及细微结构。是学校、医院、教学使用外还适用于农业、林业、医药、卫生、地质、考古、生物等行业。
Cost-Effective Multi-Services Hybrid Access Networks with no Optical Filter at Remote Nodes
2011/11/22
This letter experimentally demonstrates a multiservices hybrid access network integrated radio-over-fiber and fiber-to-the-home systems which share the same distributed architecture. A 1.25-Gb/s baseb...
为了克服光照、表情变化等因素对人脸识别的影响,本文提出了一种自适应的Gabor图像特征抽取和权重选择的人脸识别方法.该方法首先把每幅人脸图像经过Gabor小波变换后得到的40个不同尺度和方向下的图像都看作是独立的样本,再把不同人脸中的同一尺度和方向的变换结果进行特征重组,得到40个独立地新特征矩阵.为了增强对光照、表情变化的鲁棒性,每一新特征矩阵的识别贡献被本文所提出的自适应权重方法计算得到.其次...
Computer Generated Quadratic and Higher Order Apertures and Its Application on Numerical Speckle Images
Higher Order Modulated Apertures Speckle Imaging Resolution Point Spread Function
2011/6/29
A computer generated quadratic and higher order apertures are constructed and the corresponding numerical speckle images are obtained. Secondly, the numerical images of the autocorrelation intensity o...
三维激光扫描仪分辨率的测试方法
加权平均法 方差分析 分辨 拟合鉴定
2011/6/9
为获取便携式三维激光扫描仪分辨率与扫描范围间的量化关系，以Creaform公司的Handyscan EXAscan扫描仪获取标准块在不同分辨率等级下的点云数据，应用逆向校核软件Geomagic Qualify测试试验数据样本，并采用方差分析和加权平均的统计方法分析样本数据。试验结果显示，EXAscan扫描仪的四级分辨率与扫描范围间均呈线性关系，且拟合度均超过0.979，该测试方法可快速有效地判别三...
High Speed Energy-Efficient Germanium Electro- absorption Modulator Featuring Monolithic Integration with Germanium p-i-n Photodetector
Optical devices Modulators
2011/5/26
We report a novel evanescent-coupled germanium electro-absorption modulator with a small active area of 16 μm 2 OCIS codes: (230.0230) Optical devices; (230.4110) Modulators giving an extinction ratio...
High-Power,Low-Noise Slab-Coupled Optical Waveguide (SCOW) Amplifiers and Lasers
Semiconductor optical amplifiers Semiconductor lasers Mode-locked lasers
2011/5/22
We review the development of a Watt-level semiconductor quantum-well gain medium based on the slab-coupled optical waveguide (SCOW) concept. Devices realized in the 1.5-m-wavelength region inc...
High-Performance Low-Loss Silicon-on-Insulator Microring Resonators using TM-polarized Light
Optical devices Resonators
2011/5/22
Microring resonators on SOI are investigated for both orthogonal polarizations. By demonstrating low-loss (1.94dB/cm) microring resonators with an intrinsic Q up to 340000 we proof that using TM-polar...
A new ultra-high sensitivity, low-power optical receiver based on a decision-feedback equalizer
Fiber optics links and subsystems Fiber optics sources and detectors Optical interconnects
2011/5/21
A decision-feedback equalizer is used to recover data at baud rates far above the bandwidth of a low-noise TIA front-end. The overall 90-nm CMOS DC-coupled clocked receiver has better than -25 dBm pow...
Characterization of Semiconductor-Laser Phase Noise with Digital Coherent Receivers
Characterization Semiconductor-Laser Phase Noise Digital Coherent Receivers
2011/5/20
We develop a method of characterizing semiconductor-laser phase noise using a digital coherent receiver. The field spectrum, FM-noise spectrum, and phase-error variance can completely describe phase-n...
Bismuth-Doped Optical Fiber Amplifier for 1430 nm Band Pumped by 1310 nm Laser Diode
Bismuth Optical Fiber Amplifier Pumped Laser Diode
2011/5/20
A 24dB gain Bismuth-doped fibre amplifier pumped by a 65mW commercial laser diode at 1310nm is reported for the first time. A 3dB bandwidth of 36nm and a noise figure of 6dB are demonstrated.
Tuning Methods for Uncooled Low-Cost Tunable Lasers in WDM-PON
Tuning Methods Uncooled Low-Cost Tunable Lasers WDM-PON
2011/5/18
This paper investigates tuning of uncooled low-cost lasers without an integrated wave locker via a shared, centralized wave locker in a WDM-PON context.