共查询到19条相似文献,搜索用时 78 毫秒
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设计了一种新的相位提取算法,根据推导的评价函数,研究了其误差特性,与传统相位提取算法做了比较分析,其频域特性有了显著提高.分析结果证明该算法对失谐误差不敏感,高阶偶数谐波误差对结果值也不敏感,具有比较优势.仿真实验结果验证了理论预期. 相似文献
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讨论红外相位测距系统的测距精度及误差来源,对系统的合理化设计、正确使用及系统检验是非常重要的。本文就系统几项影响较大的误差进行定性、定量分析,并提出改进措施. 相似文献
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相位测量轮廓术中随机相移误差的校正算法 总被引:19,自引:10,他引:9
在相位测量轮廓术(PMP)中.随机相移误差足导致测量误差的重要因素,提出一种新的随机相移误差的校正算法,在五步相移的基础上不需要求解相位分布.通过近似处理可以直接求解相移过程中存在的随机相移误差,在保证精度的情况下,能大大减少迭代次数和计算量。推导了新算法的计算公式,详细说明了随机相移误差的求解过程。计算机模拟和实验证实了新的算法的有效性。与In-bok Kong的算法相比较,新算法能大大减少迭代次数和计算量。该新算法也同样适用于相移干涉计量。 相似文献
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A precise method for measurement of two-dimensional birefringence distribution is described and discussed. This method can determine the relative retardation and the azimuthal angle of the fast axis in an optical component. In order to detect relative retardation with high resolution, a local-sampling phase shifting technique is proposed. This method can measure 256 × 256 values of the birefringent phase difference and azimuthal angle in a short time with ± 0.02 deg (0.03 nm) of retardation accuracy. 相似文献
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Hideo Furuhashi Ryota Sugiyama Yoshiyuki Uchida Kiyofumi Matsuda Chander P. Grover 《Optical Review》2005,12(2):109-114
A new optical phase measurement method using a differentiation filter is proposed. The new method uses two images obtained by shifting the filter. This method has an advantage in that non-uniformity of the wavefront intensity does not produce errors. We present herein the theory of the newly proposed method and verify the theory by computer simulation. The effects of non-uniformity of the wavefront intensity, noise, and bias shifting length for errors are discussed. The system has been demonstrated for a plane wave and a spherical wave. For the proposed method, although the number of errors due to noise increases, the number of errors due to non-uniformity decreases. Therefore, the proposed method is useful for the phase measurement of a wavefront for which the intensity is not uniform. In addition, it improves the accuracy of the phase measurement system using a differentiation filter. 相似文献
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移相干涉技术中移相器的自校正方法 总被引:7,自引:1,他引:6
移相干涉技术(PSI)是80年代兴起的一门干涉图形自动识别技术,移相器作为移相干涉技术的关键部件其移相误差将直接影响到移相干涉技术的干涉图的识别精度。本文提出了一种移相器的自校正方法,即利用移相干涉仪的自身系统,通过快速傅里叶方法,对移相器进行逐步逼近校正。结合移相式红外干涉仪的研制,给出了一组移相器的自动校正的实验,实验表明,校正后的移相器的非线性误差可由原来的5%降低到0.2%。 相似文献
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提出一种双图全息相移干涉法.该方法可以用来计算与时间有关的位相分布,两幅全息干涉条纹图可以同时得到,并且有固定的90°位相差.虽然两幅条纹图的位相可以随着时间变化,如环境影响,或载荷变化,但他们之间的位相差恒定.该方法利用二维傅氏变换,结合偏振相移法以及分光技术. 相似文献
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移相干涉术的一种新算法:重叠四步平均法 总被引:18,自引:3,他引:15
提出了一种能大大地减小由于移相器的位移误差而引起相位复原误差的新方法,即重叠四步平均法(Overlapping Averaging 4-Frame (OAF) Algorithm)。给出了这种方法的盯们复原精度与移相器的位移误差之间的关系式,从关系式中可见,OAF算法大大地减小由于移相器的位移误差而引起相位复原误差,通过计算机模拟,得到了各种算法的相位复原精度与移相器的位移误差之间的关系曲线,分析 相似文献
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This paper presents the results of an error analysis in electro-optics holography. These errors include phase measurement errors due to the linear phase shifter errors in static electro-optic holography, and phase measurement errors due to the errors in the vibrating bias amplitude and phase in dynamic electro-optic holography. Through the error analysis, we found that the phase shifting errors in static electro-optic holography are twice as large as those in the conventional 4-bucket phase shifting algorithm, and the phase shifting errors in dynamic electro-optic holography are similar to those in the 4-bucket phase shifting algorithm. 相似文献
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设计了基于光学涡旋相移技术的离面位移测量实验方案,实现了电子散斑干涉中相移的数字控制.该方法利用输入液晶空间光调制器中的叉形光栅产生涡旋光束,通过涡旋光束绕轴的旋转产生相移;同时,产生的涡旋光束又作为参考光与物光干涉.实验中,在物体发生离面位移前后依次输入四幅叉形光栅,产生相移步长为π/2的涡旋光束,利用CCD获得涡旋光与物光的干涉光场,从而获得离面位移场的包裹相位;再通过解包裹,获得物体离面变形的相位变化.光学涡旋相移法可应用于离面位移测量. 相似文献