A Universal Moiré Effect and Application in X-Ray Phase-Contrast Imaging.
A Universal Moiré Effect and Application in X-Ray Phase-Contrast Imaging.
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莫尔图案是通过叠加两个规则几何形状的黑白或灰度图案（例如两组均匀间隔的线条）而创建的。我们观察到光束中两个透明相位掩模之间在一定距离处发生的类似效应。该相位莫尔效应和经典莫尔效应被证明是连续光谱的两端。相位莫尔效应允许使用透明屏幕检测亚分辨率强度或相位图案。当应用于 X 射线成像时，它可以实现无需吸收光栅的多色远场干涉仪 (PFI)。 X射线干涉测量法可以非侵入性地检测物体内部的折射率变化。目前的台式干涉仪在近场工作，但灵敏度和 X 射线剂量效率有限。通用莫尔效应有助于克服这些限制，并且无需制造亚微米周期的硬 X 射线吸收光栅。
A moiré pattern is created by superimposing two black-and-white or gray-scale patterns of regular geometry, such as two sets of evenly spaced lines. We observed an analogous effect between two transparent phase masks in a light beam which occurs at a distance. This phase moiré effect and the classic moiré effect are shown to be the two ends of a continuous spectrum. The phase moiré effect allows the detection of sub-resolution intensity or phase patterns with a transparent screen. When applied to x-ray imaging, it enables a polychromatic far-field interferometer (PFI) without absorption gratings. X-ray interferometry can non-invasively detect refractive index variations inside an object. Current bench-top interferometers operate in the near field with limitations in sensitivity and x-ray dose efficiency. The universal moiré effect helps overcome these limitations and obviates the need to make hard x-ray absorption gratings of sub-micron periods.
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影响因子：
4.6
作者：
Miao H;Gomella AA;Harmon KJ;Bennett EE;Chedid N;Znati S;Panna A;Foster BA;Bhandarkar P;Wen H
通讯作者：
Wen H
DOI：
10.1103/physreva.49.r2213
发表时间：
1994-04-01
期刊：
Physical review. A, Atomic, molecular, and optical physics
影响因子：
--
作者：
Clauser;Li
通讯作者：
Li
影响因子：
19.6
作者：
Pfeiffer, F;Weitkamp, T;David, C
通讯作者：
David, C
影响因子：
1.3
作者：
Panna, A.;Gomella, A. A.;Wen, H.
通讯作者：
Wen, H.
影响因子：
10.8
作者：
Miao H;Gomella AA;Chedid N;Chen L;Wen H
通讯作者：
Wen H