星形光波导耦合器的耦合特性分析

根据TE0模光波导的本征场分布、瑞利索末菲标量衍射积分公式和激励源与光波导耦合的匹配效率公式,给出光波导端面衍射和耦合的归一化发射系数和接收系数计算公式,推导出光波导端面非接触耦合的耦合效率计算公式。光波导模场分布采用高斯函数近似表达,给出简洁的计算光波导端面非接触耦合的耦合效率函数表达式。最后,基于星形光波导耦合器结构参量的特点,将累加运算采用积分运算近似表达,给出星形光波导耦合器接收光波导总的接收效率与耦合器基本参量的关系,阐明了星形光波导耦合器的耦合特性。     

激光加速度传感器的理论研究

提出了一种新型加速度传感器的设计理论。该传感器设计以角锥棱镜作为惯性摆，利用光学干涉原理，可以实现对运动物体的二维加速度测量。对该传感器进行了系统的理论研究，给出了二维加速度激光传感器设计参量选取的一般规律，并给出了实验的初步结果。     

五层MOS光波导TE模光学特性的简化分析

应用一种简化的方法对五层MOS光波导的光学特性进行了分析,给出了TE模传播常数和吸收损耗系数的近似计算公式,并结合计算结果检验了本方法及公式的精度,为实现波导中TE_0模低损耗单模传输,讨论了某些波导参量的选择.     

高重复频率激光等离子体软X光脉冲探测

研制了一种高重复频率小型激光等离子体软Ｘ光脉冲探测装置，给出其设计原理和性能参量，采用光谱学诊断方法研究了光源的软Ｘ射线辐射特性，得到了一些新的实验结果     

夹心压电换能器的优化设计──分析各参数对换能器性能的影响

本文给出了夹心换能器各种性能参量的表达式，较全面地分析了夹心换能器的结构与材料参数对其性能的影响，提出了在不同应用中设计该种换能器的途径。     

CCD位移传感器结构参量计算方法

推导了CCD位移传感器的计算公式,给出了一种位移传感器结构参量的数值逼近计算方法,实验结果表明,利用该方法确定CCD位移传感器的结构参量,可提高测量精度.     

一种反射式强度调制型光纤传感器的设计与实现

本文介绍了一种结构简单、易于实现的反射式强度调制型光纤传感器．它是根据光纤端面与被测物体之间所构成的反射接收关系制作而成的．文中给出了平面反射式强度调制型光纤传感器所依据的理论公式,采用L—M非线性拟合算法,使用制作的传感器采集数据并对光纤传感器各参量进行了标定．目前用这种方法制作的光纤传感器已经成功应用于教学实验．     

抽运光角度调谐准相位匹配光学参量振荡器的研究

针对利用周期极化晶体实现的抽运光角度调谐准相位匹配(QPM)光学参量振荡器(OPO)进行了系统的理论分析，给出了描述QPM OPO中抽运光旋转角与三波波长关系的精确公式和近轴公式.研究发现，对信号光单谐振的情况而言，抽运光与空闲光沿晶体x轴的同侧出射，而对空闲光单谐振而言，抽运光与信号光沿晶体x轴的同侧出射.另外，信号光单谐振下信号光与空闲光间的夹角要大于空闲光单谐振下两者间的夹角.更重要的是，信号光单谐振时的波长调谐速度也较空闲光单谐振时的大. 关键词： 准相位匹配 空闲光单谐振光学参量振荡器 抽运光角度调谐 调谐速度     

结构光焊缝检测传感器设计理论的研究

对电弧光的干扰进行了深入的研究，建立了电弧干扰的光照模型，依据透视变换理论，给出了光源倾斜照射和摄像机斜接收情况下，被检测物体与摄像机这间的一般坐标变换数学模型，这两个模型对结构光传感器的设计具有非常重要的指导意义，基于这两个模型设计的结构光传感已在自动焊接实验中获得了成功的应用。     

开关结构对a-SiTFT-LCD光学特性的影响

分析非晶硅薄膜晶体管在a-SiTFT-LCD中的开关特性，讨论这种开关结构中的主要功能膜材料尺寸与性能参量、光刻制备工艺，存储电容以及栅脉冲延迟效应等对a-SiTFT-LCD的通断电流比，信号响应与保持特性，图像亮度与对比度等光学特性的影响。     

Laser Vision Measurement System and Assessment Method for SMIC Lead Coplanarity

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｉｎｔｈｅｅａｒｌｙ 1970ｓ ,ＰｈｉｌｉｐｓＣｏ .Ｌｔｄ .(Ｎｅｔｈｅｒｌａｎｄｓ)ｂｒｏｕｇｈｔｆｏｒｔｈａｎｏｖｅｌｍｏｕｎｔｔｅｃｈｎｏｌｏｇｙ—ＳＭＴ (ＳｕｒｆａｃｅＭｏｕｎｔＴｅｃｈｎｏｌｏｇｙ ) ,ｗｈｉｃｈｉｓｔｏｓｔｉｃｋｃｏｍｐｏｎｅｎｔｓａｎｄｓｏｌｄｅｒｉｎｇｐａｓｔｅｏｎａｐｒｉｎｔｅｄｂｏａｒｄｗｉｔｈｏｕｔｐｅｒｆｏｒａｔｉｏｎ .ＳＭＴ ｂａｓｅｄｉｎｔｅｇｒａｔｅｄｃｉｒｃｕｉｔｃｈｉｐ ,ｎａｍｅｌｙＳＭＩＣ ,ｉｎｃｌｕｄｉｎｇＢＧＡ(Ｂａｌ…     

Study on Calibration Methods of Structured Light Sensor

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ａｌｉｎｅｓｔｒｕｃｔｕｒｅｄｌｉｇｈｔｓｅｎｓｏｒ (ａｌｓｏｎａｍｅｄｖｉｓｕａｌｓｅｎｓｏｒ)ｉｓｃｏｍｐｏｓｅｄｏｆｔｗｏｐａｒｔｓ ,ａＣＣＤｃａｍｅｒａａｎｄａｌｉｇｈｔｓｔｒｉｐｅｐｒｏｊｅｃｔｏｒ ,ａｓｓｈｏｗｎｉｎＦｉｇ .1 .Ｔｈｅｓｔｒｕｃｔｕｒｅｄｌｉｇｈｔｓｅｎｓｏｒｐｒｏｊｅｃｔｓａｌｉｇｈｔｓｔｒｉｐｅｏｎｔｈｅｐｒｏｆｉｌｅｏｆｔｈｅｏｂｊｅｃｔｔｏｂｅｍｅａｓｕｒｅｄｂｙａｌａｓｅｒ,ｔｈｅｎｔｈｅｓｃａｔｔｅｒｅｄｌｉｇｈｔｉｓＦｉｇ .1…     

Study on Calibration Methods of Structured Light Sensor

In this paper,advantages and disadvantages of existing calibration methods are presented.Based on the projective transformation which is the basic principle of a CCD camera,a new method of calibrating structured light sensor is presented.Steps and advantages of the calibration and experimental results are given.     

Constructing feature points for calibrating a structured light vision sensor by viewing a plane from unknown orientations

To calibrate a structured light vision sensor, it is necessary to obtain at least four non-collinear feature points that fall on the light stripe plane. We propose a novel method to construct non-collinear feature points used for calibrating a structured light vision sensor with a planar calibration object. After the planar calibration object is moved freely in the range of measuring of the structured light vision sensor at least twice, all the local world coordinates of the feature points falling on the light stripe plane can be readily obtained in site. The global world coordinates of the non-collinear feature points in the local world coordinate frame can be computed through the three-dimensional (3D) camera coordinate frame. A planar calibration object is designed according to the proposed approach to provide accurate feature points. The experiments conducted on a real structured light vision sensor that consists of a camera and a single-light-stripe-plane laser projector reveal that the proposed approach has high accuracy and is practical in the vision inspection applications. The proposed approach greatly reduces the cost of the calibration equipment and simplifies the calibrating procedure. It advances structured light vision inspection one step from laboratory environments to real world use.     

LED based fiber optic surface plasmon resonance sensor

Modeling of a miniaturized fiber optic sensor based on surface plasmon resonance utilizing a broad band diffuse source is presented. Attenuated total internal reflection with Kretschmann configuration is the basis of the theoretical model. For simulation both meridional and skew rays are considered. The performance of the sensor is evaluated in terms of sensitivity, detection accuracy and signal to noise ratio. Effects of the numerical aperture of the fiber, core diameter and length of the sensing region on the performance parameters of the sensor are studied. The results are obtained for gold and silver metallic layer on the core of the fiber. The theoretical results obtained are compared with SPR based fiber optic sensor utilizing focused beam on the end face of the fiber from a collimated source. The advantages of using broadband LED (diffuse source) source for launching light in the fiber are the miniaturization, compactness and low cost of the sensor.     

Study on the Alignment and the Calibration of a Laser Structured Light Sensor

In this paper, the principle and the application of the two dimensional laser structured light sensor are introduced. A new method for the alignment and the calibration of the laser structured light sensor are proposed. In this method, the optical collimating and the computer graphic positioning technology are used. Therefore, the processing of the alignment and the calibration of the laser structured light sensor has been simplified and the required accuracy can be reached.     

Study on the Alignment and the Calibration of a Laser Structured Light Sensor

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｔｈｒｅｅ ｄｉｍｅｎｓｉｏｎａｌｓｅｎｓｉｎｇｉｓｗｉｄｅｌｙｕｓｅｄｉｎｍａｎｙｆｉｅｌｄｓｓｕｃｈａｓａｕｔｏｍｏｂｉｌｅｂｏｄｙ ｉｎ ｗｈｉｔｅｍｅａｓｕｒｅｍｅｎｔ,ｒｏｂｏｔｖｉｓｉｏｎ ,ｉｎｖｅｒｓｅｅｎｇｉｎｅｅｒｉｎｇ,ｃｕｒｖｅａｎｄｃｏｎｔｏｕｒｍｅａｓｕｒｅｍｅｎｔ,ＣＡＤ ＣＡＭａｎｄｍｅｄｉｃａｌｄｉａｇｎｏｓｉｓ .Ｏｐｔｉｃａｌｔｈｒｅｅ ｄｉｍｅｎｓｉｏｎａｌｓｅｎｓｉｎｇｉｓｒｅｇａｒｄｅｄａｓｔｈｅｍｏｓｔｐｒｏｍｉｓｉｎｇｗａｙｉｎ…     

一种高精度线结构光视觉传感器现场标定方法

针对现有线结构光视觉传感器标定方法存在的局限性,提出一种不需要求解光平面标定点的标定方法.根据光条图像求解平面靶标上光条在摄像机坐标系下的Plücker矩阵.在视觉传感器前合适位置将平面靶标摆放多次,联立所有光条空间直线的Plücker矩阵,求解光平面在摄像机坐标系的平面方程.最后通过非线性优化方法得到光平面方程在最大似然准则下的最优解.在标定过程中,所有光条点都参与光平面参数的计算过程,因此该方法标定结果精度高、稳健性强.实验证明,与现有方法相比该方法标定精度提高30%左右.     

A generalized modelling technique for linearized motions of mechanisms with flexible parts

Analysis and control of vibrations of agricultural machines to improve machine performance and vibration comfort of the operator is a major concern of manufacturers these days. In this paper, an analytical method to build the linearized equations of motion of an elastic tree structured mechanism, is presented. The method is based on the principle of virtual work resulting in a set of parameterized linear equations that are functions of the mechanical parameters and the geometry and the interconnection structure of different bodies in the mechanism. The rigid-body motions of the mechanical system are represented by Lagrangian generalized co-ordinates while elastic deformations are described by nodal co-ordinates from a finite element formulation. Explicit expressions for external distributed and concentrated forces and internal concentrated forces acting on the mechanism are given.     

Numerical analysis of uncertain temperature field by stochastic finite difference method

Based on the combination of stochastic mathematics and conventional finite difference method,a new numerical computing technique named stochastic finite difference for solving heat conduction problems with random physical parameters,initial and boundary conditions is discussed.Begin with the analysis of steady-state heat conduction problems,difference discrete equations with random parameters are established,and then the computing formulas for the mean value and variance of temperature field are derived by the second-order stochastic parameter perturbation method.Subsequently,the proposed random model and method are extended to the field of transient heat conduction and the new analysis theory of stability applicable to stochastic difference schemes is developed.The layer-by-layer recursive equations for the first two probabilistic moments of the transient temperature field at different time points are quickly obtained and easily solved by programming.Finally,by comparing the results with traditional Monte Carlo simulation,two numerical examples are given to demonstrate the feasibility and effectiveness of the presented method for solving both steady-state and transient heat conduction problems.