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1.
自由曲面光学透镜的图像变换面形测量系统与精度建模   总被引:1,自引:0,他引:1  
郭震宇  冯之敬 《光学技术》2002,28(3):195-197
为了解决自由曲面光学透镜光学表面面形的高精度测量问题 ,提出了一种可用于自由曲面光学透镜面形测量的图像变换光学曲面面形测量系统。从测量系统的测量原理出发 ,分析了测量过程中各种误差对测量精度的影响 ,推导出了自由曲面光学透镜的图像变换面形测量系统的测量误差公式 ,建立了自由曲面光学透镜的图像变换面形测量系统的测量精度数学模型 ,得到了该测量系统具有很高测量精度的结论 ,并且用实验给予验证。  相似文献   

2.
介绍了合肥光源同步光测量系统,包括条纹相机系统、快速光电测量束团长度系统、束团横向截面测量系统和光位置测量系统.利用条纹相机系统和快速光电测量柬团长度系统进行了束团长度测量和束团伸长效应的研究.利用束流截面测量系统进行了六极铁对横向不稳定性抑制效果和横向反馈系统反馈效果的测量研究.光位置测量系统采用丝型光位置检测器和自行研制了对数处理?用于测量光源点的束流位置和角度.  相似文献   

3.
卡尔曼滤波在激光跟踪测量系统中的应用   总被引:5,自引:0,他引:5  
激光跟踪测量系统对于测量运动目标空间位置是行之有效的,但在测量过程中,各种干扰噪声的影响会降低测量精度。采用卡尔曼滤波来减小噪声的影响以提高测量精度。介绍了激光跟踪测量系统,建立了状态方程和测量方程,给出了卡尔曼滤波算法,仿真结果表明,运用卡尔曼滤波大大提高了测量系统的精度。  相似文献   

4.
近距离高准确度光电测距技术的研究   总被引:1,自引:1,他引:0  
研究了近距离光电测距系统的工作特点,设计了近距离光电测距相机光学系统.基于几何相似法原理,提出几何相似法光电测量系统的测量过程是一个不等准确度测量过程.重点研究了不等准确度测量过程中的测量数据处理技术,给出了测量系统测量数据修正的方法.同时对比了修正前和修正后测量结果的差异,明确指出,采用不等准确度最小二乘法处理测量数据可以提高极近距离处的测量准确度.  相似文献   

5.
选择正确的测量方法 提高测量灵敏度   总被引:1,自引:0,他引:1  
黄少鹏 《物理实验》1996,16(2):83-84
选择正确的测量方法 提高测量灵敏度黄少鹏(安徽财贸学院物资贸易工程系蚌埠233041)一、测量灵敏度的意义物理实验中,测量值的精确度与测量灵敏度有着密切的关系.在实验中,如何提高测量灵敏度,减小测量误差,从而提高测量值的精确度是很重要的问题.测量灵敏...  相似文献   

6.
合肥光源基于同步光的测量与研究   总被引:1,自引:0,他引:1  
介绍了合肥光源同步光测量系统, 包括条纹相机系统、快速光电测量束团长度系统、束团横向截面测量系统和光位置测量系统. 利用条纹相机系统和快速光电测量束团长度系统进行了束团长度测量和束团伸长效应的研究. 利用束流截面测量系统进行了六极铁对横向不稳定性抑制效果和横向反馈系统反馈效果的测量研究. 光位置测量系统采用丝型光位置检测器和自行研制了对数处理器, 用于测量光源点的束流位置和角度.  相似文献   

7.
用van der Pauw方法测量磁控溅射制备的掺锡氧化铟(ITO)薄膜的电学性能,研究了在室温和冰水混合条件下测量电流大小对电阻率测量结果的影响;在室温条件下测量电流和磁场的大小对载流子浓度和迁移率测量结果的影响.实验结果显示,测量电流为5 mA和测量磁场为0.5 T时,测量结果最佳.  相似文献   

8.
李昭莹  谢芳  马森  刘义秦 《光学学报》2012,32(6):612004-95
研究一种能够进行远程及绝对测量的光纤低相干干涉传感系统。该系统包含两个光纤干涉仪,其中一个光纤干涉仪置于被测场中感应被测量的变化,可实现远程测量;另一个光纤干涉仪解调被测量的值。运用波分复用技术,使用于解调的光纤干涉仪同时工作于低相干干涉和高相干干涉状态。用低相干干涉信号决定被测量的幅值,对被测量实现绝对测量,并使测量量程不受波长限制;同时,用高相干干涉信号对被测量进行高精度的测量。系统的测量量程为6mm,测量分辨率小于1nm,位移实验结果的线性相关系数R为0.99。  相似文献   

9.
为实现某武器系统核心部件的自动精确测量,依据通用三坐标测量系统设计原理,研制了一套激光扫描自动测量系统。本文首先介绍了测量系统的组成;然后从激光测量头测量原理、电路原理和气路原理等三方面介绍了系统的工作原理;通过建立理想测量模型和实际测量模型,给出了测量坐标系与用户坐标系的转换关系及利用标准件进行系统参数标定的方法;最后,通过建立准刚体误差数学模型,对系统误差进行了分析、计算。测量结果表明,该系统单点测量精度优于7μm,球面度测量精度优于22μm。  相似文献   

10.
介绍了强流重离子加速器装置HIAF(High Intensity heavy-ion Accelerator Facility)项目增强器BRing(Booster Ring)快脉冲二极磁铁的性能指标、测量要求和测量方法,描述了快脉冲二极磁铁稳态磁场测量系统及动态磁场测量系统的构成。在稳态磁场测量中,为提高积分磁场测量精度和测量效率,长线圈测量系统采用了on fly技术;在动态磁场测量中,研制了用于磁场延迟及磁场畸变测量的矩阵线圈。通过样机磁铁的测量,完成了测量系统的性能指标验证和磁铁的稳态磁场测量。实测结果表明,样机磁铁的设计和制造均达到了预期指标,并依据测量数据完成了磁铁的二次削斜。  相似文献   

11.
The formalism and the results of modeling the population dynamics of the states of a three-level model molecule by using the optical Bloch equations are compared with the formalism and results of modeling the population dynamics of the states of the molecule–radiation field system by means of quantum electrodynamics. Examples of significant differences between the results of application of these approaches regarding the behavior of the time dependences of the populations of the states of the molecule, the values of the quantum yield of the photoreaction or the intensity of Rayleigh and resonance Raman scattering are given. These differences are the greater, the higher the rate of the radiative decay of the resonantly excited state with the transition of the molecule to the ground state as compared to the rate of the decay of this state with the transition of the molecule to the third molecule (undecaying) state.  相似文献   

12.
Specific features of the structure of self-assembled layers of dodecanthiol on the surface of polycrystalline films of gold are investigated with the aim of revealing the effect of the substrate relief on the lateral distribution and the predominant orientation of thiol molecules within the limits of the layer. The analysis of the angular dependence of quasi-elastically scattered light that takes into account the contributions of the geometric roughness of the surface and the inhomogeneity of the dielectric constant to scattering allowed us to establish the correlation in antiphase between the distribution of the thickness of the thiol coating and the height of the relief of the gold surface. The formation of a thiol layer on the surface of polycrystalline gold is a complex process including adsorption, local self-assembly, and a surface-induced distortion of the ordered structure in the regions of minima of the surface relief. The approach proposed here and based on the nondestructive analysis of thin organized coatings can be efficiently applied for the study of specific features of the topography and the prediction of chemical functionality of self-assembled molecular ensembles.  相似文献   

13.
The response of a medium at the triple frequency under the action of few-period laser pulses is considered within the framework of the thin-optical-layer approximation for the case where the triple frequency is close to the natural frequency of the linear oscillator. It is shown that a bistable dependence of the polarization amplitudes on the external action amplitude simultaneously appears at both the natural frequency and the frequency of the external action. This allows one, in particular, to reveal the presence of bistability of the regime of third harmonic generation in a physical experiment by using the transmitted radiation of the acting pulse. A decrease in the duration of the pulse incident on the medium leads to an increase in the hysteresis loops. The effect of the absolute phase of a short pulse on the spectral composition of the response of the medium is studied. For pulses of medium duration, in addition to the resonant response of the medium, the presence of the dynamic response of the medium at the triple frequency was revealed, despite a detuning of the latter from the resonance. The presence of this frequency in the spectrum of the response of the medium results in the dependence of the resonant response of the medium on the absolute phase even for a sufficiently long pulse containing tens oscillations of the electric field strength under the pulse envelope. To obtain the dynamics of the spectral lines from the results of computer simulation, the Fourier-Gabor method is used, the applicability of which is demonstrated by the comparison of the results obtained on its basis with the corresponding analytical dependences.  相似文献   

14.
Dependences of the dispersion laws and damping of waves in an initially sinusoidal superlattice on the dimensionality of inhomogeneities modulating the period of the superlattice are studied. The cases of one-and three-dimensional modulations, as well as modulation by a mixture of inhomogeneities of both of these dimensionalities, are considered. The correlation function of the superlattice K(r) has the form of a product of the same periodic function and a decreasing function that is significantly different for these different cases. The decreasing part of the correlation function for the mixture of inhomogeneities of different dimensionalities has the form of a product of the decreasing parts of the correlation functions of the components of the mixture. This leads to the nonadditivity of the contributions of the components of different dimensionalities to the resulting modification of the parameters of the wave spectrum that are due to the inhomogeneities (the damping of waves for the mixture of these components is smaller than the sum of the dampings of the components, the maximum gap in the spectrum corresponds to the simultaneous presence of both components of the mixture, not only of the three-dimensional inhomogeneities).  相似文献   

15.
潘雷雷  张彬  阴素芹  张艳 《物理学报》2009,58(12):8289-8296
建立了由掺Yb光纤激光器阵列、变换透镜、闪耀光栅和输出耦合镜组成的光束谱合成系统的光束传输模型.在考虑光栅角色散、光栅刻槽倾角误差和光栅衍射效率情况下,利用光线追迹法、衍射积分方法、光束非相干叠加原理和强度二阶矩方法,推导出高斯光束非平行倾斜入射到闪耀光栅的相位变化公式以及谱合成光束的光强分布解析表达式.分析了高斯光束非平行倾斜入射到光栅后,光栅角色散、光栅衍射效率和光栅刻槽倾角误差对掺Yb光纤激光器谱合成系统输出光束特性的影响.研究结果表明,谱合成光束具有与单根光纤激光器几乎相同的光束质量;光栅角色散对合成光束特性的影响可忽略;随着光栅刻槽倾角误差的增大,谱合成光束的光束质量明显变差;当光栅刻槽倾角误差较大时,必须考虑光栅衍射效率对合成光束特性的影响. 关键词: 掺Yb光纤激光器 非平行倾斜入射 光束谱合成 光束质量  相似文献   

16.
Influence of the weak electric field on the electronic structure of the Fibonacci superlattice is considered. The electric field produces a nonlinear dynamics of the energy spectrum of the aperiodic superlattice. Mechanism of the nonlinearity is explained in terms of energy levels anticrossings. The multifractal formalism is applied to investigate the effect of weak electric field on the statistical properties of electronic eigenfunctions. It is shown that the applied electric field does not remove the multifractal character of the electronic eigenfunctions, and that the singularity spectrum remains non-parabolic, however with a modified shape. Changes of the distances between energy levels of neighbouring eigenstates lead to the changes of the inverse participation ratio of the corresponding eigenfunctions in the weak electric field. It is demonstrated, that the local minima of the inverse participation ratio in the vicinity of the anticrossings correspond to discontinuity of the first derivative of the difference between marginal values of the singularity strength. Analysis of the generalized dimension as a function of the electric field shows that the electric field correlates spatial fluctuations of the neighbouring electronic eigenfunction amplitudes in the vicinity of anticrossings, and the nonlinear character of the scaling exponent confirms multifractality of the corresponding electronic eigenfunctions.  相似文献   

17.
陈顺意  丁攀峰  蒲继雄 《物理学报》2015,64(20):204201-204201
基于Wolf近轴传输理论, 导出离轴径向偏振光束光强的解析表达式, 并研究离轴量对离轴径向偏振光束传输中光强分布的影响, 同时根据一阶矩质心位置的定义推导出离轴径向偏振光束的质心坐标, 研究其质心位置的变化规律. 结果表明, 与径向偏振光束不同, 离轴径向偏振光束在近场处传输时光强分布不均匀, 随着传输距离的增加, 光强分布均匀性逐渐得到改善, 而径向偏振光束在传输中始终保持空心对称光斑. 离轴量较小时, 近场处光强分布呈非对称空心面包圈形, 随着传输距离增达到一定程度, 光强分布演化为对称空心面包圈形, 离轴量越小, 演变距离越短; 离轴量较大时, 随着光束的传输离轴径向偏振光束的空心部分消失, 逐渐由空心面包圈形向高斯型演变, 径向偏振光束特性消失. 另一方面, 离轴径向偏振光束的质心不随传输距离的改变而改变. 质心纵坐标恒为零, 质心横坐标与光斑尺寸及离轴量相关. 随着光斑尺寸增大, 质心横坐标成线性增长. 当离轴量较小时, 质心横坐标随离轴量的增大呈非线性增长, 增长量不明显; 离轴量较大时, 质心横坐标随离轴量的增大呈线性增长, 且变化明显.  相似文献   

18.
A mathematical model of the auditory analysis of periodicity of sound and its envelope is proposed. The model consists of a sequence of mathematical transformations that describe the signal processing stages. The following parameters and properties of the auditory system are taken into account: the crude analysis of the input acoustic signal accurate to the width of the aural critical band; the frequency dependence of the width of the aural critical band; the spectrum of the input signal analysis by a set of 3500 filters closely spaced in frequency; the absolute audibility thresholds at a given frequency; the time-domain analysis of both the output signals of each filter and the envelope profile with the help of the periodicity function; the pulsed activity of auditory neurons; the ability of the auditory system to memorize the spectral-time images of the signal and its individual parameters; the ability of the auditory system to form the perception of the loudness of sound, to memorize and compare the loudness of sound at different time moments, and to conclude which of them is higher or lower or whether they are equal accurate to a certain threshold; the dependence of the critical modulation bandwidth on the modulation frequency; and the dependence of the audibility thresholds of amplitude modulation on the modulation frequency. By an example of processing amplitude-modulated signals with various carrier-to-envelope frequency ratios, the model is shown to give a satisfactory explanation of their pitch and auditory estimate of the envelope period.  相似文献   

19.
为了解决面临保障任务时,我军现有保障设备对武器装备故障检测周期过长以及测试资源在测试周期中被单个故障装备长时间占用的问题,对基于云测试(Cloud Testing)的自动测试系统(ATS,Automatic Test System)的体系架构进行了研究。以软件可移植性、硬件可互换性和系统互操作性为设计原则,对面向信号测试领域的云测试系统的体系架构进行了分析;在充分研究现有ATS的体系架构及其存在的突出问题的基础上,提出了基于云测试的ATS的软、硬件模型。为构建基于云测试的自动测试系统的开发和相关关键技术的研究提供了以有益的借鉴并打下了坚实的基础。  相似文献   

20.
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