CRT－LCLV and photorefractive crystl BSO based real－time joint transform correlator

ＣＲＴ－ＬＣＬＶａｎｄｐｈｏｔｏｒｅｆｒａｃｔｉｖｅｃｒｙｓｔａｌＢＳＯｂａｓｅｄｒｅａｌ－ｔｉｍｅｊｏｉｎｔｔｒａｎｓｆｏｒｍｃｏｒｒｅｌａｔｏｒＦＵＸｉａｏｌｉ；ＬＩＹｕｌｉｎ；ＺＨＡＮＧＨａｉ；ＷＡＮＧＤａｙｏｎｇ（ＸｉａｎＩｎｓｔｉｔｕｔｅｏ...     

A 0．98μm Laser Diode Pumped Erbium－Doped Fiber Amplifier with 40nm Bandwidth

Ａ０．９８μｍＬａｓｅｒＤｉｏｄｅＰｕｍｐｅｄＥｒｂｉｕｍ－ＤｏｐｅｄＦｉｂｅｒＡｍｐｌｉｆｉｅｒｗｉｔｈ４０ｎｍＢａｎｄｗｉｄｔｈ￥ＬＩＪｉｎｇｈｕｉ；ＰＥＮＧＪｉａｎｇｄｅ；ＪＩＡＮＧＸｉｎ；ＹＡＯＭｉｎｙｕ；ＷＵＧｅｎｇｓｈｅｎｇ；ＦＡＮＣｈｏ...     

A High Efficient Stable Intracavity Doubling Nd：YAG Laser Pumped by a Laser Diode

ＡＨｉｇｈＥｆｆｉｃｉｅｎｔＳｔａｂｌｅＩｎｔｒａｃａｖｉｔｙＤｏｕｂｌｉｎｇＮｄ：ＹＡＧＬａｓｅｒＰｕｍｐｅｄｂｙａＬａｓｅｒＤｉｏｄｅ￥ＺＨＡＮＧＫｕａｎｓｈｏｕ；ＸＩＥＣｈａｎｇｄｅ；ＧＵＯＲｉｎｇｘｉａｎｇ；ＰＥＮＧＫｕｎｃｈｉ（Ｉｎｓｔｉｔ...     

Theoretical Model of Bidirectional Signal Propagation in Distributed EDFAs

ＴｈｅｏｒｅｔｉｃａｌＭｏｄｅｌｏｆＢｉｄｉｒｅｃｔｉｏｎａｌＳｉｇｎａｌＰｒｏｐａｇａｔｉｏｎｉｎＤｉｓｔｒｉｂｕｔｅｄＥＤＦＡｓ￥ＰＡＮＧＹｏｎｇ；ＪＩＡＮＧＰｅｉｘｕａｎ；ＸＵＤａｘｉｏｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＲａｄｉｏｅｎｇｉｎｅｅｒｉ...     

A Diode-pumped Low Threshold Nd:SVAP/KTP Laser

ＡＤｉｏｄｅ－ｐｕｍｐｅｄＬｏｗＴｈｒｅｓｈｏｌｄＮｄ：ＳＶＡＰ／ＫＴＰＬａｓｅｒＷＡＮＧＣｈａｎｇｑｉｎｇ；ＳＨＥＮＤｅｙｕａｎ；ＭＥＮＧＸｉａｎｌｉｎ；ＳＨＡＯＺｏｎｇｓｈｕ；ＪＩＡＮＧＭｉｎｈｕａ（ＩｎｄｉｔｕｔｅＯｆＣｒｙｓｔａｌＭａｔｅｒｉ...     

LD Pumped Q-Switching and Self-starting Mode-locked All Fiber Laser

ＬＤＰｕｍｐｅｄＱ－ＳｗｉｔｃｈｉｎｇａｎｄＳｅｌｆ－ｓｔａｒｔｉｎｇＭｏｄｅ－ｌｏｃｋｅｄＡｌｌＦｉｂｅｒＬａｓｅｒ￥ＺＨＡＮＧＪｉａｎ；ＬＩＪｉｎｇｈｕｉ；ＪＩＡＮＧＸｉｎｇ；ＬＩＵＸｉａｏｍｉｎｇ；ＰＥＮＧＪｉａｎｇｄｅ（Ｄｅｐａｒｔｍｅｎｔｏ...     

Study on the Phase Detecting Laser Interferometric System with Computer Generated Hologram

ＳｔｕｄｙｏｎｔｈｅＰｈａｓｅＤｅｔｅｃｔｉｎｇＬａｓｅｒＩｎｔｅｒｆｅｒｏｍｅｔｒｉｃＳｙｓｔｅｍｗｉｔｈＣｏｍｐｕｔｅｒＧｅｎｅｒａｔｅｄＨｏｌｏｇｒａｍ￥ＤＡＩＸｉａｏｆａｎｇ；ＣＨＥＮＸｉｎｇｗｕ；ＷＥＩＹａｏｌｉｎ；ＣＨＥＮＢｅｎｚｈｉ；Ｗ...     

Generation of 2－10ns Excimer Laser Pulse by Optical Synchronizing Wave－clipping

Ｇｅｎｅｒａｔｉｏｎｏｆ２－１０ｎｓＥｘｃｉｍｅｒＬａｓｅｒＰｕｌｓｅｂｙＯｐｔｉｃａｌＳｙｎｃｈｒｏｎｉｚｉｎｇＷａｖｅ－ｃｌｉｐｐｉｎｇＸＩＡＮＧＳｈｉｑｉｎｇ；ＬＯＵＱｉｈｏｎｇ；ＤＯＮＧＪｉｎｇｘｉｎｇ；ＭＡＮＧＹａｎｐｉｎｇ；ＷＥＩＹｕｎｒ...     

LOW ENERGY TRIPLE DIFFERENTIAL CROSS SECTIONS FOR ELECTRON IMPACT IONIZATION OF HYDROGEN

ＬＯＷＥＮＥＲＧＹＴＲＩＰＬＥＤＩＦＦＥＲＥＮＴＩＡＬＣＲＯＳＳＳＥＣＴＩＯＮＳＦＯＲＥＬＥＣＴＲＯＮＩＭＰＡＣＴＩＯＮＩＺＡＴＩＯＮＯＦＨＹＤＲＯＧＥＮＣｈｅｎＺｈａｎｇｊｉｎａ，ｂＸｕＫｅｚｕｎｂＸｕＦｕｘｉｎａａＤｅｐａｒｔｍｅｎｔｏｆＰｈｙ...     

High Performance AlGaAs Quantum Well Lasers with Low Beam Divergence Grown by Molecular Beam Epitaxy

ＨｉｇｈＰｅｒｆｏｒｍａｎｃｅＡｌＧａＡｓＱｕａｎｔｕｍＷｅｌｌＬａｓｅｒｓｗｉｔｈＬｏｗＢｅａｍＤｉｖｅｒｇｅｎｃｅＧｒｏｗｎｂｙＭｏｌｅｃｕｌａｒＢｅａｍＥｐｉｔａｘｙ￥ＹＡＮＧＧｕｏｗｅｎ；ＸＩＡＯＪｉａｎｗｅｉ；ＸＵＺｕｎｔｕ；ＸＵＪｕｎｙｉ...     

基于功率谱分析的指纹实时识别系统

把实时获取指纹的装置与功率谱分析系统结合起来，实现完整的指纹实时识别系统．从实验上研究了相干光源和非相干光源获取指纹的两种情况．实验表明，用非相干光源获取指纹的情况具有较好识别效果．     

基于菌紫质膜联合子波变换的实时模式识别

菌紫质是一种结构和功能与高级动物视网的视生色素－－视紫红质极为相似的蛋白南，是一种优异的可逆光全息记录材料，子波变换是目标特征抽取和模式识别和有效方法。本文钭联合子波变换和菌紫质膜优异的光学全息记录特性结合起来，提出了一种全新的光学全息实时模式识别方案，给出了相应的实验结果。     

Joint transform correlator for an optical face recognition system

An opto-electronic hybrid face recognition system based on real-time joint transform correlation using two types of liquid crystal spatial light modulators is proposed. The novel digital pre-processing to improve the tolerance was confirmed experimentally by face recognition from 100 references.     

Thermal 3D modeling system based on 3-view geometry

In this paper, we propose a novel thermal three-dimensional (3D) modeling system that includes 3D shape, visual, and thermal infrared information and solves a registration problem among these three types of information. The proposed system consists of a projector, a visual camera and, a thermal camera (PVT). To generate 3D shape information, we use a structured light technique, which consists of a visual camera and a projector. A thermal camera is added to the structured light system in order to provide thermal information. To solve the correspondence problem between the three sensors, we use three-view geometry. Finally, we obtain registered PVT data, which includes visual, thermal, and 3D shape information. Among various potential applications such as industrial measurements, biological experiments, military usage, and so on, we have adapted the proposed method to biometrics, particularly for face recognition. With the proposed method, we obtain multi-modal 3D face data that includes not only textural information but also data regarding head pose, 3D shape, and thermal information. Experimental results show that the performance of the proposed face recognition system is not limited by head pose variation which is a serious problem in face recognition.     

Neural Network Control of Liquid Crystal Spatial Light Modulator for Spectral Synthesis of Light

If illuminating light with expected spectral distribution can be synthesized, it will be a great help in many-applications, such as computer vision, pattern recognition, industrial quality control, and remote sensing. A light source system containing a liquid crystal spatial light modultor (LCSLM) is proposed for this purpose. A supervised neural network with a single layer was used to control the system. After training the neural nrtwork with data acquired from the system, it gives the data which should be written to LCSLM in order to synthesize illuminating light having certain spectral distribution. Eight spectral distributions were synthesized to test the performance of the system, and the average synthesizing error was 12%.     

NRZ码全光帧头识别器研究

提出了一种基于太赫兹非对称光解复用器结构的NRZ码全光帧头识别方案.通过注入辅助的连续光,解决了信号在SOA中的竞争,实现三态到两态的转换.对40 Gb/s信号的数值分析表明,这种方案可获得消光比为13.29 dB的判决识别信号输出.对非线性相移差偏离的影响进行了分析,结果表明如果限制非线性相移差的偏离小于0.1 rad,仍然可获得消光比13 dB以上的判决识别信号输出.对2.5 Gb/s帧头信号的判决实验表明,理论分析结果与实验相符.     

车号识别中的补偿光源

公路交通基础建设的不断发展和车辆管理体制的不断完善,为以视觉监控为基础的智能交通系统的实际应用打下了良好基础。在智能交通系统中,车牌自动识别系统是一个非常重要的发展方向。由于对车辆的监控是全天候的,车牌识别系统必须满足这种工作要求。在监控过程中存在自然光线不足的情况(夜晚,阴雨天等),也就是存在逆光环境中对车牌的识别问题,这样就需要补偿光源。目前大多采用大功率泛光灯作补偿光源。由于泛光灯自身的特点,使效果不能达到理想。文章从汽车车灯的光谱及人眼的光谱光视效率曲线等方面详细分析了逆光条件下车牌识别中补偿光源的选取。并经实验证明此选取方法具有很好的效果。     

利用油品紫外荧光特性的多光谱成像检测

利用石油及其产品具有的紫外荧光特性, 搭建了一套紫外诱导多光谱成像系统.该系统主要由3个紫外诱导光源、8个滤波片和1个彩色CCD相机组成.采集了6种油品的多光谱图像, 以有效光斑的24个颜色分量均值作为特征, 提出了一种联合熵最大化的独立分量分析特征优化方法.K均值聚类和支持向量机识别结果表明, 较改进前的ICA方法, 该方法的特征优化性能得到了有效提高, 油种识别率达到了92.3%.     

基于双调制的反伪装目标探测系统研究

为了实现对被伪装网覆盖的被测目标进行有效探测,提高目标识别系统的反伪装能力,设计了基于电光和磁光双调制的目标识别系统。系统由起偏器、电光调制电路、磁光调制电路、检偏器、光电探测器等组成。推导了基于电光调制与磁光调制组合形成的调制函数,并在矢量分析的基础上,计算了电光调制参数δ与磁光调制参数θ对回波光强函数的影响。实验以边长1 m的正方形钢板为测试目标,与两种常用伪装网配合在不同背景环境中进行反伪装目标探测。对不同偏振角条件下的回波光强响应电压进行了测试与分析。结果显示,目标与伪装网均存在明显的响应峰值,但由于目标位置及角度不同峰峰值位置有所不同,而背景不存在较强的响应值。故在整个磁光调制周期内,可以获得响应电压极值信号,从而识别伪装目标。对不同波长条件下的回波光强响应电压进行测试可知,光源波长的改变对回波峰峰值与背景噪声具有一定的影响,从而可以通过适当的调节光源波长实现提高目标图像信噪比的目的。总之,该系统在目标有伪装网覆盖的条件下仍能较好地区分目标及背景,具有很好地反伪能力。     

基于数字全息技术的实时指纹识别

指纹识别技术是通过计算机来实现身份识别的一种手段,在生物识别技术中占有非常重要的地位。为了提高指纹识别系统的准确度和实时性,搭建了以光学器件傅里叶透镜和空间光调制为主的联合变换相关识别全息光学系统,记录相关图像的频谱,通过比较指纹图像的像素强度,从而实现实时指纹识别的目的。