Research on object reconstruction from Fresnel intensities using phase retrieval methods
利用相位检索方法从菲涅耳强度进行物体重建的研究
基本信息
- 批准号:14550038
- 负责人:
- 金额:$ 1.98万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:2002
- 资助国家:日本
- 起止时间:2002 至 2004
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In this research, the noninterferometric reconstruction method of complex amplitude objects from their diffraction intensities was developed, in which the noniterative phase retrieval method by use of a Gaussian or exponential filtering was utilized. First, in the experiment with a laser, it has been shown that the Gaussian beam of a laser is capable of retrieving the phase distribution of a diffracted wave from the objects with the accuracy of the range from about 1/10 of the laser's wavelength. Secondly, it was first shown that the two-dimensional phase retrieval can be solved by using a noniterative method from only two far-field intensities obtained with and without an exponential filter. So far there has not been any noniterative method for the phase retrieval from such two far-field intensities. In the above experiment, the Gaussian beam of a laser was used as a Gaussian filter. However, it was a subject of inquiry how to do Gaussian filtering for phase retrieval of x-rays or ele … More ctron waves. Thus, thirdly, the Fraunhofer diffraction pattern of a circular aperture (i.e., a besinc function) was used as the object's illumination instead of a Gaussian beam, and so it was found that such an illumination enables the object reconstruction by the present method from the diffraction intensities for x-rays or electron waves, provided that the object's extent is confined within about 1/3 of the first zero's radius of the besinc function. The validity of this method is demonstrated in computer simulations of the reconstructions of a general complex object and a particular object with phase vortices. In particular, the present method is able to cope with the existence of vortices in the phase distribution in contrast with the well-known phase recovery method by solving the transport-of-intensity equation from intensity distributions. However, there exists the difficulty of filtering a small object with Gaussian functions in the present method. Thus, fourthly, an extension of the method was proposed. In the extended method, the Gaussian filtering for phase retrieval is done indirectly by taking the correlation of a slit aperture with the Fresnel diffraction amplitude of an object. The intensity data of such a correlation are obtained by measuring the diffraction intensities of a wave field transmitted through the slit aperture that is scanned on the Fresnel-zone plane. Then the phases in the Fresnel-zone plane of the object can be retrieved from two series of the intensities measured while scanning the slit by a new phase calculation technique using Fourier transforms. The object can be reconstructed from the measured moduls and the retrieved phase by an inverse Fourier transform. Less
在这项研究中,发展了复杂振幅物体的非干涉重建方法,其中利用了高斯或指数滤波的非迭代相位恢复方法。首先,在激光实验中,已经证明了激光的高斯光束能够以激光波长的约1/10的精度从物体中恢复衍射波的相位分布。其次,首次证明了只需两个远场强度用指数滤波和不用指数滤波就可以用非迭代方法求解二维相位恢复问题。到目前为止,还没有任何非迭代的方法来从这两个远场强度中恢复相位。在上述实验中,使用激光器的高斯光束作为高斯滤光片。然而,如何对x射线或eLE…进行高斯滤波以进行位相恢复是一个值得探讨的问题。更多的ctron波。因此,第三,圆孔的夫琅和费衍射图案(即,贝辛函数)被用作对象的照明,而不是高斯光束,因此发现,如果对象的范围被限制在贝辛函数的第一个零点半径的大约1/3内,这种照明能够通过本方法根据X射线或电子波的衍射强度重建对象。通过对一般复杂物体和具有相位涡旋的特殊物体的计算机模拟,验证了该方法的有效性。特别是,与著名的相恢复方法相比,本方法通过从强度分布求解强度输运方程,能够处理相分布中涡旋的存在。然而,在本方法中,存在用高斯函数过滤小目标的困难。因此,第四,提出了该方法的推广。在扩展的方法中,通过利用狭缝孔径与物体的菲涅耳衍射幅度的相关性来间接地进行高斯滤波来进行相位恢复。这种关联的强度数据是通过测量在菲涅耳区平面上扫描的穿过狭缝孔径的波场的衍射强度来获得的。然后利用傅里叶变换的一种新的位相计算技术,从扫描狭缝时测得的两系列光强中提取物体菲涅耳带平面上的位相。通过逆傅立叶变换,可以从测量的模数和恢复的相位重建物体。较少
项目成果
期刊论文数量(9)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Noniterative two-dimensional phase-retrieval method from two Fourier intensities by use of an exponential filter
使用指数滤波器从两个傅立叶强度非迭代二维相位检索方法
- DOI:
- 发表时间:2003
- 期刊:
- 影响因子:0
- 作者:Nobuharu Nakajima;N.Nakajima;Nobuharu Nakajima;Nobuharu Nakajima
- 通讯作者:Nobuharu Nakajima
Phase retrieval from experimental far-field intensities by use of a Gaussian beam
使用高斯光束从实验远场强度中恢复相位
- DOI:
- 发表时间:2002
- 期刊:
- 影响因子:0
- 作者:M.Ichida;et al.;Nobuharu Nakajima
- 通讯作者:Nobuharu Nakajima
Nobuharu Nakajima: "Phase retrieval from experimental far-field intensities by use of a Gaussian beam"Applied Optics. 41・20. 4133-4139 (2002)
Nobuharu Nakajima:“使用高斯光束进行实验远场强度的相位恢复”应用光学41・20(2002)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Lensless imaging from diffraction intensity measurements by use of a noniterative phase-retrieval method
使用非迭代相位检索方法进行衍射强度测量的无透镜成像
- DOI:
- 发表时间:2004
- 期刊:
- 影响因子:0
- 作者:Nobuharu Nakajima
- 通讯作者:Nobuharu Nakajima
Nobuharu Nakajima: "Noniterative two-dimensional phase-retrieval method from two Fourier intensities by use of an exponential filter"Applied Optics. 42・14. 2492-2497 (2003)
Nobuharu Nakajima:“使用指数滤波器的两个傅里叶强度的非迭代二维相位检索方法”应用光学 42・14(2003)。
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- 影响因子:0
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NAKAJIMA Nobuharu其他文献
NAKAJIMA Nobuharu的其他文献
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{{ truncateString('NAKAJIMA Nobuharu', 18)}}的其他基金
Study of image reconstruction byphase retrieval with a synthetic aperture-array filter in wave fields of light and x-ray
光和X射线波场中合成孔径阵列滤波器图像重建分相检索的研究
- 批准号:
22560038 - 财政年份:2010
- 资助金额:
$ 1.98万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Study of image reconstruction using a Shack-Hartmann type of phase retrieval
使用 Shack-Hartmann 型相位检索进行图像重建的研究
- 批准号:
19560034 - 财政年份:2007
- 资助金额:
$ 1.98万 - 项目类别:
Grant-in-Aid for Scientific Research (C)