共查询到20条相似文献,搜索用时 437 毫秒
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通过分析岛礁防卫对岸基监控的迫切需求,强调研发光电与雷达复合监控设备的必要性。综述国内外研究现状,归纳出复合监控设备的两种技术体制。通过对比发现将红外周扫成像与导航雷达相结合,更能满足岛礁警戒的实际使用要求。阐述了这种结合方式的特点、关键技术及解决途径,指出了岸基智能警戒技术的未来发展方向。 相似文献
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水下声学采集与发射在水声测试系统中起着举足轻重的作用,以往的测试设备往往只针对水下水声信号的原始数据采集,而在岸基与水下系统的授时、定时以及同步性上缺乏可靠的技术手段予以保证,同时也存在测试功能针对性强、扩展性差等缺点;文章提出了基于柔性测试的高精度水下声学采集与发射技术,阐述了其基本的测试原理、关键技术实现以及软硬件实现方法,完成了岸基与水下测试系统授时误差小于200 ns,定时同步误差小于100 ns,最大6通道,每通道采样不小于200 KS/s的水听器采集且同步2通道换能器任意波形输出的硬件功能,软件上实现了任务列表自动解析、基于岸基时间服务器的自动数据采集与发射功能,具有精度高、功能全面、智能化程序高等特点。 相似文献
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光电探测器原理及应用 总被引:3,自引:0,他引:3
介绍了光电与系统的组成,阐述了光电二极管和雪崩光电二极管的工作原理及噪声问题,对雪崩光电二极管APD和光电倍增管PMT进行了比较,并以四象限探测器为例说明了光电探测器的应用问题。 相似文献
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近红外光电探测器在军事和国民经济中应用广泛,如航空航天、光通信、工业控制、近红外成像等领域。文章首先讲述了近红外光电探测器的发展历史、工作原理和基本应用情况。通过比较各类光电探测器的性能参数,可以看出基于纳米材料的近红外光电探测器具有很高的响应度、探测率和响应速度。然后,文章将着重介绍近红外光电探测器在光纤通信、无人驾驶、模式识别和光电耦合等领域的发展情况及相关原理。最后,文章对近红外光电探测器的发展前景进行了展望。未来近红外光电探测器将全面应用于各大领域,但是高端的材料生长技术、高效的光电转化方法以及大规模光电器件集成工艺等方面的不足依旧是限制纳米光电探测器发展的主要因素。 相似文献
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光电对抗仿真系统研究 总被引:2,自引:1,他引:1
介绍了光电对抗在信息化战争中的地位与作用,阐述了光电对抗仿真系统研究的必要性,针对国内外光电对抗仿真的研究现状,给出了光电对抗仿真系统的总体框架,研究了光电对抗仿真需解决的关键技术和需要完成的主要工作,最后对我国光电对抗仿真系统的研究进行了总结。 相似文献
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Compact semiconductor-based ultrafast optoelectronic devices are crucial for networks with a throughput in the 1–10 Tb/s range. A variety of ultrafast phenomena in semiconductors are attractive for developing such new optoelectronic devices. This paper discusses the requirements of ultrafast optical-communication systems and necessary optoelectronic devices. Recent progress of ultrafast semiconductor-based optoelectronic devices are described with a focus on all-optical switching devices, including novel devices using electron spin polarization relaxation and intersubband transition both in multiple quantum well structures. 相似文献
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David R. Myers 《Optical and Quantum Electronics》1991,23(7):S985-S994
Ion-beam processing is the ideal complement to modern lattice-mismatched (strained-layer) heteroepitaxy for optoelectronic device fabrication. Bandstructure engineering of optoelectronic devices through the use of lattice strain is presented, and the effects of ion-beam processing on III–V strained-layer heteroepitaxial structures are summarized. Representative results from ion-implanted optoelectronic devices are presented to illustrate these principles. 相似文献
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D. Pruski M. Przybylski W. Kędzia H. Kędzia J. Jagielska-Pruska M. Spaczyński 《Opto-Electronics Review》2011,19(4):478-485
The optoelectronic method is one of the most promising concepts of biophysical program of the diagnostics of CIN and cervical
cancer. Objectives of the work are evaluation of sensitivity and specificity of the optoelectronic method in the detection
of CIN and cervical cancer. The paper shows correlation between the pNOR number and sensitivity/specificity of the optoelectronic
method. The study included 293 patients with abnormal cervical cytology result and the following examinations: examination
with the use of the optoelectronic method — Truscreen, colposcopic examination, and histopathologic biopsy. 相似文献
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辐射度学、光度学和色度学(以下简称"三度学")是现代光电信息转换、传输、存储、显示、测量和计量的基础,随着光电信息技术、图像技术的发展和应用的扩展,"三度学"及其测量技术已成为光电工程领域科研和应用人员必备的专业基础知识和技术,在国内还没有完全类似的教材和课程设置。以往教学中仅在某些课程中部分涉及辐射度学和光度学的概念,难以使学生全面地掌握和应用相关的知识,至于色度学则更少涉及,系统讲授的课程大多安排在研究生阶段,但也较少涉及相关的实验仪器和技术的讲授。从光电信息科学与工程类专业知识体系结构的角度出发,总结了多年教学科研的经验,探索了以"三度学"作为教学内容,通过配合相关测量的实验,开展了"三度学"课程建设的探索。 相似文献
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为了提高水平式光电望远镜静态指向精度,对光电望远镜静态指向修正模型进行了理论分析和实验研究,建立了水平式望远镜指向模型。首先,介绍了球谐函数模型和水平式望远镜指向模型,并对水平式望远镜指向模型加以修改。然后,对全天区均匀分布的70颗Tycho-2恒星进行实际观测,获得水平式光电望远镜在L轴和B轴上的指向偏差,利用最小二乘法对该模型进行拟合,计算出水平式望远镜指向模型中各待定系数。最后,采用该指向模型对某型水平式望远镜进行了修正。实验结果表明:采用水平式望远镜指向模型进行修正后,望远镜设备总指向精度由修正前的152.10"提高到了4.76"。满足系统总体提出的精度要求,能够广泛地应用于科研和工程领域。 相似文献
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Wavelength Division Multiplexing (WDM) is a key enabling technology for increasing the transmission capacity of optical fiber communication systems. Recently, a new family of optoelectronic devices, including detectors, switches, and emitters, that is based on resonant cavity enhancement, has emerged. Wavelength selective optoelectronic switching is achieved by placing a photothyristor in an asymmetric Fabry-Perot cavity, which provides a highly selective response at a wavelength determined during device fabrication. These WDM optoelectronic devices haue promising applications in optical COmmunications and optical logic circuits. Results on a N-p-n-p optoelectronic switch with a ten wavelength channel capability are presented. 相似文献
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A railway wheelset is subject to normal wear due to large part to friction contact between the wheelset and the rail. Because the wear of wheelset will bring the hidden security troubles to the operation of the railway, it is very important to measure the wheelset's geometrical parameters, especially the flange thickness. The optoelectronic method is proposed and can dynamically measure the flange thickness on line. Fast Fourier transform and wavelet analysis methods are used to denoise the sensor's signals. It is found that the wavelet transform produces a much better way of denoising of the signals compared with the fast Fourier transform. Comparisons of the flange thickness measurement with the wheelset creeping and the optoelectronic system are presented. The root-mean-square errors of the flange thickness with the manual measurement with the wheelset creeping and the optoelectronic method measurement with the wavelet analysis are 0.22 and 0.18, respectively. The changing range of manual measurement is much larger than that of the optoelectronic method because of the difference between every operator's measuring standard. Measurement results of the optoelectronic method show that the system has better repeatability and reliability compared to the manual measurement. 相似文献