分类： 光学 >> 显微镜 提交时间： 2023-11-15
摘要： Afull-field transmissionhardX-ray microscope (TXM) with 30nm resolution was designed and its prototype was constructed. The TXM relies on a compact, high stiffness, low heat dissipation and low vibration design philosophy and utilizes Fresnel Zone plate (FZP) as imaging optics. The design of the TXMwas introduced in detail, including the optical layout, the parameters of the FZP, the mechanical design of the TXM instrument. Preliminary imaging result with 52nm spatial resolution was achieved.
分类： 物理学 >> 电磁学、光学、声学、传热、经典力学和流体动力学 提交时间： 2023-09-06
摘要： Theaim of this researchis to reconstruct the 3D X-ray refractive index gradient mapsbythe proposed vector Radon transform and its inverse, assuming that the small-angle deviation condition is met. Theoretical analysesshowthat the X-ray beam can be modeled as a streamline with continuous change of direction in a rowwhen measured in one grating period, which allowsthe extraction of the refraction angle signals.Experimental results show thatall the 2D refraction signals of different directions can be acquired by a standard circular scanning procedure, which is typically used in the X-ray differential phase-contrast computed tomography. Furthermore, the 3D refractive index gradient maps that contain the directional density changes, can also be accurately reconstructed.
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