检索结果-内蒙古大学图书馆

Wideband microwave phase noise measurement based on photonic-assisted I/Q mixing and digital phase demodulation

OPTICS EXPRESS 2017年第19期25卷 22760-22768页

作者： Zhang, Fangzheng Shi, Jingzhan Pan, Shilong Nanjing Univ Aeronaut & Astronaut Minist Educ Key Lab Radar Imaging & Microwave Photon Nanjing 210016 Jiangsu Peoples R China

A wideband microwave phase noise measurement system is proposed based on quadrature phase demodulation of the mixing components of a signal under test (SUT) and its delayed replica. The time delay is introduced by a low-loss optical fiber, which can be sufficiently large to achieve a high phase noise measurement sensitivity, and the quadrature phase demodulation is achieved by photonic-assisted in-phase and quadrate (I/Q) mixing together with digital signal processing. Thanks to the optoelectronic hybrid quadrature phase demodulation, the use of feedback loops, which are usually required in conventional photonic-delay-line-based phase noise measurement systems, is avoided, and the measurable frequency range is expanded. An experiment is implemented. Accurate phase noise measurement of SUTs in a frequency range of 5-35 GHz is demonstrated. With a 2-km single-mode fiber serving as the photonic delay line, the phase noise floor is as low as -131 dBc/Hz at the offset frequency of 10 kHz. The proposed scheme can be applied for evaluating the performance of microwave systems using low-phase-noise and wideband tunable microwave sources. (C) 2017 optical Society of America

关键词： Diode lasers Phase measurement Phase modulation Phase noise Power spectral density signal processing

来源：评论

学校读者我要写书评

暂无评论

hybrid optoelectronic correlator architecture for shift-invariant target recognition

引用

JOURNAL OF THE optical SOCIETY OF AMERICA A-OPTICS image SCIENCE AND VISION 2014年第1期31卷 41-47页

作者： Monjur, Mehjabin Sultana Tseng, Shih Tripathi, Renu Donoghue, John James Shahriar, M. S. Northwestern Univ Dept Elect Engn & Comp Sci Evanston IL 60208 USA Northwestern Univ Dept Phys & Astron Evanston IL 60208 USA Delaware State Univ Dept Phys & Engn OSCAR Dover DE 19901 USA Digital Opt Technol Rolling Meadows IL 60008 USA

In this paper, we present theoretical details and the underlying architecture of a hybrid optoelectronic correlator (HOC) that correlates images using spatial light modulators (SLMs), detector arrays, and field programmable gate array (FPGA). The proposed architecture bypasses the need for nonlinear materials such as photorefractive polymer films by using detectors instead, and the phase information is yet conserved by the interference of plane waves with the images. However, the output of such an HOC has four terms: two convolution signals and two cross-correlation signals. By implementing a phase stabilization and scanning circuit, the convolution terms can be eliminated, so that the behavior of an HOC becomes essentially identical to that of a conventional holographic correlator (CHC). To achieve the ultimate speed of such a correlator, we also propose an integrated graphic processing unit, which would perform all the electrical processes in a parallel manner. The HOC architecture along with the phase stabilization technique would thus be as good as a CHC, capable of high-speed image recognition in a translation-invariant manner. (C) 2013 optical Society of America

关键词： Fourier optics and signal processing Correlators image processing Integrated optics optoelectronics image recognition devices

来源：评论

学校读者我要写书评

暂无评论

Design and implementation of array readout integrated circuit and image system for current mode sensors

Design and implementation of array readout integrated circui...

引用

IEEE Sensors Applications Symposium, SAS

作者： Tai-Ping Sun Jia-Hao Li Hsiu-Li Shieh Lai-Li Kang Yi-Chuan Lu Teng-Yi Wang Department of Electronics Engineering Nan Kai University of Technology Nantou County Taiwan R.O.C Department of Electrical Engineering National Chi Nan University Nantou County Taiwan R.O.C Graduate Program of Optoelectronic Technology National Chi Nan University

Considered that the dual band sensor system is the most popular design at present, this study discussed the design of a dual-band hybrid array readout circuit. The direct injection circuit structure was used in the unit pixel. The design, simulation, and layout were conducted in the 40um×40um unit pixel to complete middle and long waveband signal readouts, in order to achieve one sensor unit with two sensor modes. The readout circuit chip adopted TSMC 0.35um 2P4M CMOS 5V to design a 16×12 array readout circuit, with an input current range of the measured current at 1.9pA to 50 nA, an adjustable integration time, a maximum frame rate of 110Hz, the output swing of the chip signal of 2V, the maximum operating chip frequency of 3MHz, power dissipation of 18mW, system noise voltage Vrms of 0.68mV, and signal-noise ratio of 69dB. Finally, the tested chip was used to connect the detection system proxy board and digital signal board, and digital signal processing video through front-end filters and analog to digital converter, in order to complete signal conversion and digital signal processing. With the digital control signal provided by the signal board and signal capture, the back-end digital signal was processed and imaged on the screen. The readout circuit chip connected the signal proxy board for testing. The overall system resolution reached 10 bit.

关键词： Arrays Dual band Field programmable gate arrays Noise Infrared sensors optical sensors

来源：评论

学校读者我要写书评

暂无评论

基于光学向量矩阵乘法器的光学信息处理系统研究

引用

光电子．激光 2013年第9期24卷 1656-1661页

作者：卢洋洋周平朱巍巍张磊杨林中国科学院半导体研究所集成光电子国家重点实验室北京100080

光学向量-矩阵乘法器(OVMM)作为一种利用光学方式进行向量-矩阵运算(VMM)的光学系统,由于采用天然具有高带宽、高并行性的光学处理方式,在海量数据处理领域极具潜力。本文实现了一套基于空间OVMM的光电混合数字信号处理系统,采用自主设... 详细信息

光学向量-矩阵乘法器(OVMM)作为一种利用光学方式进行向量-矩阵运算(VMM)的光学系统,由于采用天然具有高带宽、高并行性的光学处理方式,在海量数据处理领域极具潜力。本文实现了一套基于空间OVMM的光电混合数字信号处理系统,采用自主设计实现的维度为16×16的空间OVMM作为核心运算单元。实验结果显示,系统能够完成76.8G/s乘法累加(MAC)运算,满足实时数据处理对运算速度的需求。系统使用可编程逻辑器件(FPGA)作为电学协处理单元的核心组成部分,因此具有可编程性,可以满足多种不同的应用需求。

关键词：光计算光学向量-矩阵乘法器（OVMM）向量-矩阵乘法运算（VMM）可编程

来源：评论

学校读者我要写书评

暂无评论

The Applied Research on a new Type of Photoelectricity Automatic Positioning System

The Applied Research on a new Type of Photoelectricity Autom...

引用

International Conference on optical Instruments and Technology (OIT) - optoelectronic Measurement Technology and systems

作者： Shang Changwei Wang Jianhua Zhao Yingying Xiao Zexin Cai Lin Zheng Xueke Guilin Univ Elect Technol Opt Mech & Elect Integrat Res Inst Guilin 541004 Guangxi Peoples R China Inst Informat Technol Guet Guilin 541004 Guangxi Peoples R China

ISBN: (纸本)9780819488428

With the high-speed development of the social economy, the requirements of the positioning precision and response speed of product on the production line become higher and higher. A new type of photoelectricity automatic positioning system is developed, which consists of vision sensor charge coupled device (CCD), digital image processing and stepper motor controller. They form a closed loop control system, which captures the images by the optical system, achieves photoelectric signal conversion by data image processing and controls the movements of worktable along the X and Y directions by stepper motors. As a result, it achieves fast automatic positioning and compensates the systematic errors effectively, which improves the positioning precision dramatically. In the photoelectric on-line of detecting throttle position sensor resistor, as an example of design, the photoelectric positioning system proves the correctness of the novel photoelectricity automatic positioning system. The positioning time of the system is 0.7s and the positioning precision of the system is 0.35mm, which get ideal results. The experiment of the application has proved that the new type of photoelectric automatic positioning system can be applied in the correlative production line, which has vital significance to improve the accuracy of product processing, reduce the processing time, and increase economic efficiency.

关键词： positioning precision response speed photoelectricity automatic positioning image processing photoelectric on-line detection

来源：评论

学校读者我要写书评

暂无评论

The applied research on a new type of photoelectricity automatic positioning system

引用

Proceedings of SPIE - The International Society for optical Engineering 2011年 8201卷

作者： Shang, Changwei Wang, Jianhua Zhao, Yingying Xiao, Zexin Cai, Lin Zheng, Xueke Guilin University of Electronic Technology Optical Mechanical and Electrical Integration Research Institute Guangxi Guilin 541004 China Institute of Information Technology of Guet Guangxi Guilin 541004 China

ISBN: (纸本)9780819488428

关键词： image processing

来源：评论

学校读者我要写书评

暂无评论

Coherent single-detector imaging system

Coherent single-detector imaging system

引用

IEEE Workshop on signal processing systems (SIPS)

作者： Maytee Zambrano-Nuñez Edwin A. Marengo Jonathan M. Fisher Department of Electrical and Computer Engineering Northeastern University Boston MA USA

A hybrid opto-microelectromechanical, coherent laser light, single-detector imaging system is demonstrated that applies compressive sensing algorithms for computational imaging of wavefield intensity from a small number of projective measurements of the field. The projective measurements are implemented using spatial light modulators of the digital mi-cromirror device (DMD) family, followed by a geometrical-optics-based image casting system to capture the data using a single photodetector. The reconstruction process is based on the new field of compressive sensing which allows the imaging of the main features of the objects under illumination with much less data than a typical CCD camera. The present system expands the scope of single-detector imaging systems based on compressive sensing from the incoherent light regime, which has been the past focus, to the coherent light regime which is key in many biomedical and Homeland security applications.

关键词： Cameras Compressed sensing image reconstruction Detectors optical imaging optical diffraction

来源：评论

学校读者我要写书评

暂无评论

Design of object surveillance system based on enhanced fish-eye lens

引用

Chinese Optics Letters 2009年第2期7卷 142-145页

作者：吴健辉杨坤涛项巧莲张南洋 College of Optoelectronic Science and Engineering Huazhong University of Science and Technology

A new method is proposed for the object surveillance system based on the enhanced fish-eye lens and the high speed digital signal processor （DSP）. The improved fish-eye lens images an ellipse picture on the charge-coupled device （CCD） surface, which increases both the utilization rate of the 4：3 rectangular CCD and the imaging resolution, and remains the view angle of 183° The algorithm of auto-adapted renewal background subtraction （ARBS） is also explored to extract the object from the monitoring image. The experimental result shows that the ARBS algorithm has high anti-jamming ability and high resolution, leading to excellent object detecting ability from the enhanced elliptical fish-eye image under varies environments. This system has potential applications in different security monitoring fields due to its wide monitoring space, simple structure, working stability, and reliability.

关键词： Charge coupled devices digital cameras digital signal processors Fish Lenses Meats optical instruments Security systems signal processing

来源：评论

学校读者我要写书评

暂无评论

Design of signal reception and processing system of Embedded Ultrasonic Endoscope

Design of signal reception and processing system of Embedded...

引用

2009 International Conference on optical Instruments and Technology, OIT 2009

作者： Li, Ming Yu, Feng Zhang, Ruiqiang Li, Yan Schen, Xiaodong Yu, Daoyin Tianjin 300072 China

ISBN: (纸本)9780819478924

Embedded Ultrasonic Endoscope, based on embedded microprocessor and embedded real-time operating system, sends a micro ultrasonic probe into coelom through the biopsy channel of the Electronic Endoscope to get the fault histology features of digestive organs by rotary scanning, and acquires the pictures of the alimentary canal mucosal surface. At the same time, ultrasonic signals are processed by signal reception and processing system, forming images of the full histology of the digestive organs. signal Reception and processing System is an important component of Embedded Ultrasonic Endoscope. However, the traditional design, using multi-level amplifiers and special digital processing circuits to implement signal reception and processing, is no longer satisfying the standards of high-performance, miniaturization and low power requirements that embedded system requires, and as a result of the high noise that multi-level amplifier brought, the extraction of small signal becomes hard. Therefore, this paper presents a method of signal reception and processing based on double variable gain amplifier and FPGA, increasing the flexibility and dynamic range of the signal Reception and processing System, improving system noise level, and reducing power consumption. Finally, we set up the embedded experiment system, using a transducer with the center frequency of 8MHz to scan membrane samples, and display the image of ultrasonic echo reflected by each layer of membrane, with a frame rate of 5Hz, verifying the correctness of the system. © 2009 SPIE.

关键词： Histology

来源：评论

学校读者我要写书评

暂无评论

Embedded system based optical tomography: the concentration profile

引用

SENSOR REVIEW 2009年第1期29卷 54-62页

作者： Rahim, Ruzairi Abdul Thiam, Chiam Kok Pusppanathan, Jaysunan Susiapan, Yvette Shaan-Li Univ Teknol Malaysia Fac Elect Engn Control & Instrumentat Engn Dept Skudai Malaysia

Purpose - The purpose of this paper is to view the flow concentration of the flowing material in a pipeline conveyor. Design/methodology/approach - optical tomography provides a method to view the cross sectional image of flowing materials in a pipeline conveyor. Important flow information such as flow concentration profile, flow velocity and mass flow rate can be obtained without the need to invade the process vessel. The utilization of powerful computer together with expensive data acquisition system (DAQ) as the processing device in optical tomography systems has always been a-norm. However, the advancements in silicon fabrication technology nowadays allow the fabrication of powerful digital signal processors (DSP) at reasonable cost. This allows the technology to be applied in optical tomography system to reduce or even eliminate the need of personal computer and the DAQ. The DSP system was customized to control the data acquisition of 16 x 16 optical sensors (arranged in orthogonal projection) and 23 x 23 optical sensors (arranged in rectilinear projections). The data collected were used to reconstruct the cross sectional image of flowing materials inside the pipeline. In the developed system, the accuracy of the image reconstruction was increased by 12.5 per cent by using new hybrid image reconstruction algorithm. Findings - The results proved that the data acquisition and image reconstruction algorithm is capable of acquiring accurate data to reconstruct cross sectional images with only little error compared to the expected measurements. Originality/value - The DSP system was customized to control the data acquisition of 16 x 16 optical sensors (arranged in orthogonal projection) and 23 x 23 optical sensors (arranged in rectilinear projections).

关键词： Flow signal processing Sensors Pipelines

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：