摘要
探测效率和空间分辨率是成像探测器的重要性能。采用光子晶体,可提高闪烁体的光提取效率和增加光输出,进而提高基于闪烁体的同步辐射X射线成像探测器的探测效率并缩短成像时间。探究光子晶体对于成像探测器分辨率的影响具有重要应用意义。在闪烁体上添加三种典型的光子晶体,在上海光源BL13W1线站进行探测器有无光子晶体的成像实验,对比分辨率靶成像效果以及衬度比的量化结果,得到影响分辨率的因素。结果表明,均匀有序、三角构型的光子晶体具有最佳的成像效果,对于光子晶体在成像探测器领域的应用研究具有指导意义。
Background： Indirect Charge Coupled Device （CCD） using scintillator as a convertor of X-ray is widely used in synchrotron radiation X-ray imaging system. High detection efficiency and high spatial resolution of the detector are required to take advantages of the third generation synchrotron radiation light source. It has been proved that patterning the scintillator with photonic crystal （PhC） could increase the light output of the scintillator, thus enhancing the detection efficiency of scintillator-based detector. Purpose： In order to exploit the application of PhC in scintillator-based X-ray imaging detector, it is necessary to investigate the effect of PhC on the spatial resolution of the imaging detector. Methods： Three kinds of PhC, Polystyrene （PS）, Anodic Aluminum Oxide （AAO） and SiNx, were employed and superinduced on the Y3Al5O12：Ce scintillator basal. Imaging experiments with and without PhC were performed at the BL13Wl beamline of the Shanghai Synchrotron Radiation Facility （SSRF）. The effect of PhC on the resolution was evaluated by comparing images of resolution bar taken by detector with and without PhC. Results： The homogeneity and the lattice type of the PhC, i.e., SiNx have great impact on the spatial resolution. Conclusion： PhC with homogeneous structure is preferred to achieve better spatial resolution. Triangular lattice PhC performs better than the square lattice one in imaging detector.
出处
《核技术》
CAS
CSCD
北大核心
2015年第7期1-6,共6页
Nuclear Techniques
基金
中国科学院大科学装置开放研究项目:自组装技术与超高密度纳米阵列研究
上海市学术带头人项目(No.13XD1404400)
国家杰出青年科学基金(No.11225527)资助
关键词
光子晶体
闪烁体
同步辐射成像
探测器
空间分辨率
Photonic crystals, Scintillator, Synchrotron radiation imaging, Detector, Spatial resolution
