共查询到19条相似文献,搜索用时 78 毫秒
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提出了一种用朗奇法定量检测大口径非球面的新技术。主要以大口径非球面镜的加工表面为研究对象,设计了大口径非球面检测系统,该系统由CCD摄像机、He-Ne激光器、郎奇光栅、微型计算机等组成。并利用大口径非球面检测系统对一个顶点曲率半径为1638.69mm,被测曲面半通光口径为315mm的光学元件的面形进行了实际测量,给出了光学元件标准偏差和峰谷值测量结果。最后对测量结果进行了讨论。研究结果表明:基于郎奇法的几何原理,利用CCD摄像系统定量检测大口径非球面的方法具有较高的精度。 相似文献
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傅里叶变换条纹相位分析法测量非球面镜 总被引:1,自引:0,他引:1
本文将傅里叶变换(FFT)条纹位相测量方法用于非球面镜的检测。叙述了波面位相偏差测量原理。提出用最小二乘拟合波象差代替计算全息图(CGH)补偿非球面波象差,并分析了测量误差。 相似文献
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研究了大口径非球面光学元件表面轮廓测量过程可视化,并设计、开发了基于双向链接边表的软件系统。提出一种改进的双向链接边表数据结构完成三维模型加载方法,建立数据结构及其相关图形元作为软件的基础层。计算非球面曲面方程获得表面轮廓的数据生成图形场景节点,并自动生成曲面测量轨迹。在非接触检测平台上进行测试,对测量数据进行平滑处理,拟合出测量获得的非球面面形,完成面形精度和表面粗糙度的评价。实验结果表明,该可视化系统技术路线正确高效、稳定性好,为非球面检测数据及其综合分析仿真提供直观的可视化平台。 相似文献
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研究了大口径非球面光学元件表面轮廓测量过程可视化,并设计、开发了基于双向链接边表的软件系统。提出一种改进的双向链接边表数据结构完成三维模型加载方法,建立数据结构及其相关图形元作为软件的基础层。计算非球面曲面方程获得表面轮廓的数据生成图形场景节点,并自动生成曲面测量轨迹。在非接触检测平台上进行测试,对测量数据进行平滑处理,拟合出测量获得的非球面面形,完成面形精度和表面粗糙度的评价。实验结果表明,该可视化系统技术路线正确高效、稳定性好,为非球面检测数据及其综合分析仿真提供直观的可视化平台。 相似文献
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Ronchi线条法检验大非球面镜的理论计算 总被引:4,自引:0,他引:4
由光线追迹和三级像差理论计算大抛物面的Ronchi弯线条。分析这两种理论计算方法的结果和偏差,其偏差值随镜子的口径增大而增加,用所计算的结果制作的Ronchi弯线条检验可移动式平行光管的φ700mm口径的抛物面主镜。给出检验结果。 相似文献
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提出一种新的零朗奇检测法用于测量大口径非球面镜的面形。利用光线追迹和正弦条纹的相位信息设计补偿正弦光栅。使用透射液晶显示屏显示补偿正弦光栅并作为相移装置。一个离轴点光源发出的光被镜面反射后通过补偿正弦光栅,摄像机记录携带镜面偏差信息的相移条纹图。通过对相移条纹图的分析确定被测镜面的实际横向像差以及对应的理想横向像差,然后基于朗奇检测的几何原理得到被测镜面的偏差梯度,对其积分获得被测镜面的偏差,进而重建被测镜面的三维面形。与传统的零朗奇检测法相比,这种方法可以消除补偿光栅上每个条纹带边缘的锯齿形状,而且可以获得镜面上足够多的待测点信息。计算机模拟和初步实验验证了该方法的可行性。 相似文献
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Antonio Luiz P.S. Campos Adaildo Gomes d'Assunção 《International Journal of Infrared and Millimeter Waves》2004,25(1):15-27
This work presents a sensitivity analysis for the resonant frequency and bandwidth of frequency selective surfaces (FSS) as a function of the structural parameters. The frequency selective surface structure considered here is composed by crossed dipole conductive patches deposited on an anisotropic dielectric layer. Firstly, the moment method is used in combination with the immittance technique in the spectral domain to determine the frequency response of the analyzed structure. Secondly, numerical techniques are used to obtain the resonant frequency and bandwidth sensitivities as a function of the considered FSS structural parameters. 相似文献
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1 Introduction Alongperiodfibergrating (LPFG)isanovelpassivefiberelementarisinginrecentyears[1] .SeveralapplicationsofLPFGhavebeenfound ,suchas gain profileflattenedfilter,band rejectionfilter,andtemperature ,strainornewchemicalsensors[2 ,3] .ItcanbeUV writtenor… 相似文献
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In a long period fiber grating(LPFG), the forward-propagating guided mode in the core is coupled to a number of co-propagating lossy cladding modes at resonance wavelengths. Sensitivity of resonance wavelength against temperature, axial strain, and external refractive index is modeled in this paper. Schemes for temperature compensation and enhanced wavelength tuning of LPFG are proposed and analyzed. Experiments show accordant results with simulations. Temperature coefficient of the LPFG compensated by means of axial strain is below 1.8 nm/100℃. For the LPFG with polymer recoating layer, the enhanced tuning range is more than 70 nm. 相似文献
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利用电场改变液滴透镜的面形得到非球面,并实时检测其面形和焦斑图像,在适当的时候用紫外光固化液滴制作具有良好光学性能的非球面微透镜.比较了非球面液滴微透镜在固化前后面形、焦斑的变化和对透镜性能的影响,讨论了液滴透镜在固化过程中变形的机理和相应的解决方法.用分辨率50 nm的光斑探针扫描仪精确测量了固化后的非球面微透镜的聚焦光斑,测得了光斑轴向分布曲线和均方根直径3.384μm的聚焦光斑,经图像处理计算了透镜的点扩散函数和光学传递函数,评价了所制作的非球面微透镜的聚光和成像能力,并给出了透镜的实际成像图像,对于完善高品质非球面微透镜及其阵列的制作工艺具有重要意义. 相似文献
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In this letter, we give a simple proof of the fact that the determinant of Laplace operator in a smooth metric over compact Riemann surfaces of an arbitrary genus g monotonously grows under the normalized Ricci flow. Together with results of Hamilton that under the action of the normalized Ricci flow a smooth metric tends asymptotically to the metric of constant curvature, this leads to a simple proof of the Osgood–Phillips–Sarnak theorem stating that within the class of smooth metrics with fixed conformal class and fixed volume the determinant of the Laplace operator is maximal on the metric of constant curvatute.Mathematical Subject Classifications (2000). 58J52, 53C44. 相似文献
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Muttahid Ull Hoque 《Fiber and Integrated Optics》2018,37(5):264-276
In this article, we have proposed and demonstrated experimentally the double plano-convex micro-aspherical lens scheme to amplify an edge-emitting laser diode (LD) to optical fiber coupler. Both microlenses have two different profiles along their x- and the y-axes direction. The optical simulation software Zemax is used to design and optimize the proposed microlens profile and then fabricate by an excimer laser micromachining system. Focal spot size of LD around 9 µm is achieved experimentally. Light coupling efficiency between LD and optical fiber, using this double plano-convex microlens, is 27.57% and 44.23% for single-mode and multi-mode fiber, respectively. 相似文献
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The possibility for the concentration sensitivity improvement and the limit of detection of the elements at a laser microspectral analysis is studied by means an absorbtion decrease of the laser emission in the plasma torch. From the investigations at an incline of 0°, 30°, 45°, 60° on the surface of the sample in the laser emission direction it is established, that the most intensive spectra are obtained at an incline of 45°. At an incline of 45° the intensity of certain spectral lines increases up 3 times in comparison with that of the horizontal surface of the sample. The limit of detection increases with one or two orders. The gradution curves for the determination of Si, Mn, Fe. 相似文献