Sub-arcsecond x-ray imaging with Multi-Image X-ray Interferometer Module (MIXIM): introduction of a periodic coded-aperture mask
Sub-arcsecond x-ray imaging with Multi-Image X-ray Interferometer Module (MIXIM): introduction of a periodic coded-aperture mask
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DOI：
10.1117/12.2629656
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发表时间：
2022-08
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影响因子：
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通讯作者：
K. Asakura;K. Hayashida;S. Sakuma;A. Ishikura;K. Sawagami;W. Kamogawa;T. Yoneyama;H. Noda;K. Okazaki;M. Hanaoka;K. Hattori;Yusuke Matsushita;T. Mineta;M. Yoshimoto;Yuichi Ode;T. Hakamata;H. Matsumoto;H. Tsunemi
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作者：
K. Asakura;K. Hayashida;S. Sakuma;A. Ishikura;K. Sawagami;W. Kamogawa;T. Yoneyama;H. Noda;K. Okazaki;M. Hanaoka;K. Hattori;Yusuke Matsushita;T. Mineta;M. Yoshimoto;Yuichi Ode;T. Hakamata;H. Matsumoto;H. Tsunemi
我们已经开发了一种新的X射线干涉仪，多图像X射线干涉仪模块（MIXIM），包括一个细孔掩模和X射线探测器。该系统的角分辨率可以通过增大两个元件之间的距离或减小孔径尺寸来提高。尽管MIXIM已经通过利用周期性多针孔掩模应用塔尔博特效应实现了小于0.1”的角分辨率，但是仍然存在其1.3%的低开口分数减小成像系统的有效面积的问题。因此，我们新推出了开口率约为50%的周期性编码孔径掩模，而不是多针孔掩模。利用12.4keV平行X射线束进行实验，成功地证明了周期性编码孔径可以形成自像，并通过破译编码图案获得了亚角秒角分辨率的X射线源轮廓。通过引入周期性编码孔掩模，有效面积比多孔掩模增加了约25倍，表明该方法可以有效解决这一问题。
We have developed a novel x-ray interferometer, multi-image x-ray interferometer module (MIXIM), comprised of a fine aperture mask and an x-ray detector. The angular resolution of this system can be improved with an increase of the distance between two components or a decrease of the aperture size. Although MIXIM has already achieved an angular resolution of less than 0.1” by applying the Talbot effect with a periodic multi-pinhole mask, there remains the issue that its low opening fraction of 1.3% decreases the effective area of the imaging system. Therefore, we newly introduced periodic coded aperture masks which have opening fractions of about 50% instead of the multi-pinhole mask. Conducting an experiment with a 12.4 keV parallel x-ray beam, we successfully demonstrated that the periodic coded aperture could form the self-image, and obtained the x-ray source profile with sub-arcsecond angular resolution by deciphering the coded pattern. The effective area increases about 25 times compared with the multi-pinhole mask by the introduction of the periodic coded aperture masks, which indicates that this novel method can be effective for addressing the problem.