Yadav Poonamlata S, Kashyap Y S, Roy Tushar, Sarkar P S, Sinha A
Laser and Neutron Physics Section, Bhabha Atomic Research Centre, Mumbai, India.
J Synchrotron Radiat. 2008 Jan;15(Pt 1):100-5. doi: 10.1107/S0909049507046237. Epub 2007 Dec 18.
Phase-contrast imaging provides enhanced image contrast and is important for non-destructive evaluation of structural materials. In this paper, experimental results on in-line phase-contrast imaging using a synchrotron source (ELETTRA, Italy) for objects required in material science applications are discussed. Experiments have been carried out on two types of samples, pyrocarbon-coated zirconia and pyrocarbon-coated alumina microspheres. These have applications in both reactor and industrial fields. The phase-contrast imaging technique is found to be very useful in visualizing and determining the coating thickness of pyrocarbon on zirconia and alumina microspheres. The experiments were carried out at X-ray energies of 16, 18 and 20 keV and different object-to-detector distances. The results describe the contrast values and signal-to-noise ratio for both samples. A comprehensive study was carried out to determine the thickness of the pyrocarbon coating on zirconia and alumina microspheres of diameter 500 microm. The advantages of phase-contrast images are discussed in terms of contrast and resolution, and a comparison is made with absorption images. The results show considerable improvement in contrast with phase-contrast imaging as compared with absorption radiography.
相衬成像可增强图像对比度，对结构材料的无损评估具有重要意义。本文讨论了利用同步辐射源（意大利的ELETTRA）对材料科学应用所需物体进行在线相衬成像的实验结果。已对两种类型的样品进行了实验，即热解碳包覆的氧化锆和热解碳包覆的氧化铝微球。这些样品在反应堆和工业领域均有应用。发现相衬成像技术在可视化和确定氧化锆及氧化铝微球上热解碳的涂层厚度方面非常有用。实验在16、18和20 keV的X射线能量以及不同的物-探测器距离下进行。结果描述了两种样品的对比度值和信噪比。进行了一项全面研究以确定直径为500微米的氧化锆和氧化铝微球上热解碳涂层的厚度。从对比度和分辨率方面讨论了相衬图像的优势，并与吸收图像进行了比较。结果表明，与吸收射线照相相比，相衬成像的对比度有显著提高。
