共查询到20条相似文献,搜索用时 656 毫秒
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Yasuhiko Arai 《Journal of Modern Optics》2013,60(15):1223-1228
Electronic speckle pattern interferometry is employed in many industrial fields as a useful deformation measurement method. However, two speckle patterns obtained before and after the deformation are necessary for measurement. Furthermore, at least three speckle patterns are required for high resolution measurement using ordinary fringe scanning technologies. In this paper, a novel method that can measure high speed deformations using a limited number of speckle patterns without using high speed cameras is proposed. The method enables application to dynamic deformation analysis because the method involves analysis using only two speckle patterns obtained before and after the deformation. A novel optical system that can record some spatial information into each speckle is set up for the method. In experimental results, it is confirmed that the out-of-plane deformation measurement can be precisely performed by the method and that the resolution power is almost equivalent to that of the ordinary method. 相似文献
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Yasuhiko Arai 《Journal of Modern Optics》2013,60(4):297-306
AbstractSpeckle interferometry is an important deformation measurement method for an object with a rough surface. In this paper, a novel fringe analysis method is proposed that uses a new optical system, which uses a plane wave as the reference beam of the speckle interferometer. When the optical system is employed in fringe analysis, the deformation information and the bias components of the speckle patterns are clearly separated in the frequency domain. Therefore, the deformation information can be readily extracted using a Fourier transform, which gives a pair of real and imaginary components concerning the information. The specklegram is calculated using such a pair of components, and the phase map is obtained from the specklegram. Experimental results confirmed that the resolution power of this measurement method is higher than 1/261 of the wavelength of the light source of the optical system. 相似文献
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Dynamic deformation measurement with a large deformation is effectively performed by using virtual speckle patterns. The virtual
speckle pattern has been generally produced by using the operation based on Fourier transform. However, it takes a long calculating
time to produce a virtual speckle pattern, because the method requires Fourier transform operation at each pixel of CCD. In
the proposed method, virtual speckle patterns are produced by Carré algorithm without any operation by Fourier transform.
The method is applied to the in-plane deformation measurement in this paper. As the results, it is confirmed that the calculating
cost of virtual speckle patterns is improved remarkably, and that the measurement accuracy of the new method is also equal
to the ordinary methods. It is also confirmed that the proposed method will expand the use of the speckle interferometry based
on virtual speckle pattern technology. 相似文献
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Yasuhiko Arai 《Journal of Modern Optics》2018,65(16):1866-1874
Speckle interferometry is generally known as a method for measuring the deformation of an object with rough surfaces. In this paper, a three-dimensional (3D) shape measurement method is proposed for superfine structures beyond the diffraction limit using the basic property of speckle interferometry. Since the differential coefficient distribution of the shape of such an object can be detected in speckle interferometry by imparting a known lateral shift to the measured object, the shape can be reconstructed by integrating the differential coefficient distribution. Based on experimental results obtained using diffraction gratings as measured objects, it is confirmed that the proposed method can measure 3D shapes that are beyond the diffraction limit of the lens. 相似文献
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激光多普勒爆破容器高速变形动态测量技术的研究 总被引:2,自引:0,他引:2
为了获取爆破过程中爆炸容器变形参数来分析爆破强度,设计了激光多普勒效应外差纵向测量系统,利用高斯光束理论和束腰特性优化了光路结构.根据爆破过程多普勒信号的特点,研究了相应的数字滤波和频谱分析方法,实现了爆破容器高速形变过程的动态测量.系统的测量形变量程为±30mm,测量形变速度的量程为-10 m/s~+20 m/s,遥测距离为4.5 m.与标准振动台的试验对比,位移测量相对误差小于1%.最后,还给出了圆柱形钢制罐体在20gTNT当量炸药爆破过程中变形的测量结果. 相似文献
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An optical method has been developed to measure the deformation of a membrane in a microphone. A fringe projector that consists of an optical fiber and an optical wedge is described and analyzed by geometric optics. A three-step phase-shifting technique that involves the introduction of an arbitrary phase is discussed. The fine fringe patterns projected onto a small test surface are captured by a CCD camera mounted on a long-distance microscope. With the aid of a phase-shifting technique and signal-demodulating techniques, the proposed setup is capable of measuring deformation of the membrane of the order of as much as submicrometers. 相似文献
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Yasuhiko Arai 《Journal of Modern Optics》2013,60(15):2329-2345
A high resolution new fringe analysis method for ESPI with only one camera is proposed by using features of speckle interferometry in a deformation process of a measured object. The profile of intensity of each speckle of the speckle patterns in the deformation process is analyzed by the Hilbert transform. A virtual speckle pattern for creating a carrier fringe image is produced artificially by using the information of profiles of intensities of speckles. The deformation map of the measured object can be detected by the virtual speckle pattern in an operation based on the spatial fringe analysis method. Experimental results show that the difference between the results by the new and the ordinary methods is 0.1 rad as standard deviation. From the results, it is confirmed that the high resolution measurement can be performed by this method the same as compared to the ordinary measurement method which needs to employ three speckle patterns. 相似文献
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光电经纬仪测量飞行器三维坐标方法及误差分析 总被引:19,自引:1,他引:18
介绍一种用于光电经纬仪精确测量飞行器三维坐标的计算方法,该方法利用空间两异面光轴公垂线估计交会点位置,克服了常规处中的模型误差,分析了观测量误差 产生的原因并提出了改正方法,对定位测量误差进行了仿真,结果表明,利用该方法并合理布站可显著提高从标测量精度,对于机动大目标的坐标测量误差小于0.20m。 相似文献
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Miks A Novak J Novak P 《Journal of the Optical Society of America. A, Optics, image science, and vision》2006,23(4):894-901
Measurements of very small phase changes in optical measurement techniques are usually performed with interferometric methods that are based on evaluation of interference patterns, which correspond to a phase change of the investigated wave field. If values of the phase change are small, it is difficult to determine accurately the phase values, and one needs very expensive measurement systems. We present a simple method for evaluation of small phase variations that uses the interference of polychromatic light. The phase change affects the color of the interference pattern, and the color of the interference pattern corresponds to a specific phase change that can be evaluated using colorimetric analysis. We describe and analyze our colorimetric phase evaluation method. The proposed method offers accurate results, and it may be suitable for practical utilization in the optical industry. 相似文献
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移相干涉仪环境微扰的外差检测及信号处理 总被引:1,自引:1,他引:0
对环境微振动干扰进行补偿可减小移相干涉测量的误差,其中振动量的检测是实现振动补偿的前提。以声光调制器作为光学移频器,在移相式平面干涉仪中组合成外差干涉测振系统,可以实现光程差微小变化(范围为0到1/2波长)的实时检测。在外差信号处理中采用单片RF/IF相位测量芯片直接对两路40MHz模拟信号进行比相,简化了通常使用的数字测相方法,其精确测相的典型非线性值小于1度。用该系统实际测量了周期性振动和地面冲击振动对干涉仪的影响,获得了干涉仪所受微振动的幅度和相位。 相似文献
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为了解决传统白光干涉测量技术中对线性位移机构的位移精度要求过高的问题,本文提出了一种全视场外差白光干涉测量技术。该技术主要通过使用存在差频的白光干涉信号作为光源来实现在大扫描步长和低扫描精度条件下相干峰位置的高精度检测。本文首先建立了白光外差干涉的数学模型,再根据数学模型提供的光强信号特性提出了整体系统设计方案,然后对测量方案的可行性进行了实验验证。最后针对多种误差对算法计算精度的影响进行了理论分析和数据对比。误差分析的结果表明:白光外差干涉测量技术提供更高的测量精度和更好的抗干扰性能,有效地降低了传统白光干涉测量对线性位移机构精度的严苛依赖,为光学自由曲面检测技术提供了更多的可选解决方案。 相似文献
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Meruzhan Kerobyan Anna Gyulasaryan Suren Soghomonyan Gevorg Gabrielyan Stepan Essaian 《Journal of Modern Optics》2013,60(10):808-813
A method for measuring parallelism of transparent optical components with small aperture size is described. It uses a Haidinger-type laser interferometer adapted for the measurement of optical components with millimeter and sub-millimeter aperture size. The method is based on the measurement of the optical thickness variation when the plate under test is translated across a focused laser beam. Measurement results for optical parts with 0.8 mm–10 mm aperture size are presented. 相似文献
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The speckle interferometry is an effective technique in the displacement measurement of a structure with a rough surface. However, when the fringe scanning technique is introduced to speckle interferometry for improving the measurement resolution, generally two speckle patterns before and after the deformation of the measurement object and another speckle pattern obtained under different conditions from these two speckle patterns are required at least. So, three speckle patterns are generally required for precise fringe analysis as a minimum condition. In this paper, a method for introducing the fringe scanning method is proposed by controlling the phase of the specklegram as a fringe image using filtering techniques. Then, the temporal fringe analysis method that uses only two speckle patterns are proposed for speckle interferometry. As the result of experiments, it is shown that high precise fringe analysis can be realized by the fringe scanning methods using only two speckle patterns for the displacement measurement with a large deformation. 相似文献