共查询到20条相似文献,搜索用时 46 毫秒
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A new method of three-dimension profile measurement is proposed based on infrared-light interference technology, which is extended from visible-light region to infrared-light region for white-light scanning interferometry. Microstructure with two steps of different heights is used to be demonstrative sample to prove the property of designed system based on linnik-type interferometric microscope with phase-stepping algorithm. Three-dimension profile and step height can be obtained accurately with GaAs wafer transmission compensation and are highly consistent with the results that obtained from the famous commercial instrument MSA 400. The novel method has widely potential applications in the field of MEMS, such as reconstructing the internal profile of encapsulation devices and analyzing the quality evaluation of bonding interface based on semiconductor materials. 相似文献
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Xiujian Chou Kangkang Niu Yi Liu Chenyang Xue Jun Liu Wendong Zhang 《Optical Review》2012,19(1):34-38
White-light scanning interferometry is extended from the visible-light region to the infrared-light region to measure the
three-dimensional (3D) topography of components. An infrared-light interference system based on a linnik-type interferometric
microscope is developed according to the principle of transmission of semiconductor materials in the infrared-light region.
The 3D topography is measured using the components covered with a Si or GaAs wafer based on a phase-stepping algorithm. The
3D topography can be obtained accurately and relative step heights can be determined within an error less than 3% compared
with the instrument MSA 400, a well-known commercially available apparatus used in the field of 3D topography measurement. 相似文献
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利用线阵CCD自动测量航空相机镜头的焦距 总被引:6,自引:0,他引:6
提出了一种以线阵CCD固态传感器取代读数显微镜的航空相机镜头焦距测量系统。论述了系统的工作原理、软件和硬件的设计及系统的测量误差。结果表明 ,利用线阵固态图像传感器取代读数显微镜 ,把特定物体经透镜成像的大小转换为电信号的脉宽 ,并利用计算机技术自动处理测量数据 ,从根本上克服了用读数显微镜进行测量的缺陷 ,实现了航空相机镜头焦距的实时精确地在线测量 相似文献
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在东方超环(EAST)装置中,由于大量锂化壁处理的使用,切向可见光摄像机拍摄到等离子体边界通常存在一条由锂(Li)杂质形成的绿色发光带.本文基于EAST边界等离子体参数条件,基于碰撞-辐射模型给出由已知边界等离子体状态推算Li绿光光强的空间分布的具体方法,并针对简化后的一维径向分布问题,收集、处理OPEN-ADAS数据库的数据,采用软件Mathematica 10.4.1编写相应的数值计算程序,分别输入EAST工作于低约束(L)与高约束(H)模时获得的两组边界电子温度、密度分布数据,给出并分析比较了利用该模型的计算结果.此项工作对于未来建立通过测量及反演边界锂杂质特征谱线强度的空间分布来重构边界等离子体状态的全新技术和研究存在三维磁场扰动条件下的边界等离子体行为均具有重要的理论参考价值. 相似文献
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利用高速CCD 可见光相机系统研究了EAST 上的边缘局域模(ELMs)细丝动力学特性。采用Tsai 两步标定法对CCD 相机进行标定,以实现将CCD 图像坐标转换为真实空间坐标。选取CCD 图像中与边缘局域模细丝垂直方向上的图像灰度值,绘制了灰度分布图。灰度分布图中的一个凸起的尖峰代表了一条边缘局域模细丝结构,细丝的位置坐标由尖峰顶点确定。运用Sobel 边缘检测算子检测细丝边缘轮廓,从而得到细丝的宽度。通过对边缘局域模细丝宽度特性的分析,发现边缘局域模细丝在从最外层封闭磁面向外传播的过程中宽度不断减小。这表明细丝在向外传播的过程中其能量和粒子不断耗散。I-型边缘局域模的细丝宽度比III-型边缘局域模细丝的宽度更大。 相似文献
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For the optical spectrum region, we describe a novel phase-coded aperture imaging system that can be used in a computational imaging camera. The optical design includes a phase-only screen followed by a detector array. A specific diffraction pattern forms at the detector array when the wavefront from a point source object passes through the phase screen. Since diffraction effects cannot be ignored in the optical regime, an iterative phase retrieval method is used to calculate the phase coded screen. Correlation type processing can be applied for the image recovery. Computer simulation results are presented to illustrate the excellent imaging performance of this camera. 相似文献
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��˴������ Ⱥ���ӷ��� 《核聚变与等离子体物理》2006,38(4):386-393
The high speed CCD visible-light camera system has been installed to detect the dynamic characteristics of ELMs filaments on EAST tokamak. In order to convert the CCD video imaging coordinates into real space coordinates, the CCD system has calibrated using Tsai’s two-stage calibration technique. A raised spike in the grayscale profile, drawn by selecting the grayscale value of the image in the vertical direction of the ELMs filament in the CCD image, represents an ELMs filament structure whose positional coordinates are determined by the apex of the spike. The Sobel edge detection operator was used to examine the edge profile of the filament to obtain the width of the filament. By analyzing the characteristics of the filament width of the ELMs, it is found that the width of ELMs filaments continuously decreases outward from the outermost magnetic surface. This indicates that the filaments continue to dissipate energy and particles as they propagate outward. The width of filaments of Type-I ELMs is greater than that of Type-III ELMs. 相似文献
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Optical coherence tomography (OCT) is a novel imaging modality based on low-coherence interferometry. This paper summarizes some of our latest work on the development of OCT where we have taken two approaches. In the first approach we have developed a phase-drift-suppression method for stable heterodyne detection in the presence of phase fluctuations. In the second approach we have concentrated on the development of two-dimensional heterodyne detection techniques for real-time imaging. A novel detection scheme has been proposed, which enables parallel heterodyne detection with a commercially available imager such as a charge-coupled-device camera. Meanwhile, a non-scanning OCT system configuration based on off-axis interferometry is being studied. Using a newly developed angular-dispersion imaging scheme, we show that the axial reflectance profile in OCT measurement can be detected instantaneously with a sensor array. 相似文献
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采用长焦距镜头的后工作空间全口径分光原理,利用门控型像增强器、CCD相机、基于大规模可编程集成电路的高速快门控制触发系统等部件,研制了具有较高时间分辨能力和高灵敏度的两分幅高速相机,并在此基础上建立了束参数的高速测量系统。两分幅相机的最高快门速度约3 ns,幅间间隔时间则具有以0.5 ns的步进进行调节的能力;快门时间及幅间间隔时间可以分别独立调节,最大可到1 s;同时具有较好的线性度和空间响应的均匀性,等效背景噪声低到约5 electronspixel-1s-1,并且分幅相机灵敏度调节范围大。该系统一次可以拍摄两幅图像,图像阵列可达到1 0241 024,满足神龙一号的各种测量要求。 相似文献
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The first plasma was obtained in the EAST on September 26th, 2006. Single-null (SN) and double-null (DN) diverted plasmas were achieved successfully in the EAST tokamak on January 22nd, 2007. The employed plasma diagnostics for first plasma study of EAST are as follows: a vertical one-channel far-infrared (FIR) hydrogen cyanide (HCN) laser interferometer for measuring the line average density, a 10-channel soft X-ray array for intensity measurement, a 16-channel heterodyne Electron Cyclotron Emission (ECE) for measuring the electron temperature profile, a 8-channel XUV bolometer array to measure plasma radiation losses, a 3-channel hard X-ray array for intensity measurement, an electromagnetic measurement system, a 35-channel Hα radiation array, 20 probes for divertor plasma, a one-channel visible bremsstrahlung emission, an impurity optical spectrum measurement system and two optical spectroscopic multi-channel analyzers (OMA). The first experimental results of diagnostic systems are summarized in this Letter. 相似文献
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An optical heterodyne array imaging system is described for double-exposure interferometric measurement of objects that change because of stress or vibration. The signal measurement and processing approach is summarized, and the method is demonstrated in the laboratory. An advantage of this technique over other electronic interferometric imaging methods is that complex exposures are created with digital phase and amplitude values at each image pixel. In addition, measurement of object deformation does not require time synchronization between the camera exposure time, or laser pulse time, and object vibration frequency. 相似文献