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介绍了一种基于THGEM的X射线光斑寻迹探测器,用于X射线单光子计量技术研究和测量,探测器有效面积200 mm×200 mm,采用128路基于ASIC和FPGA的高速读出电子学,探测器分为中间高分辨区和外围低分辨区两部分,两部分共用一套读出电子学。实验在中国计量科学研究院利用X光机产生的束线,测试光斑位置、光斑精细分布以及探测器的位置分辨。实验结果表明,探测器实现了同时对光斑寻迹和光斑的精细测量,探测器中间高分辨区x方向的位置分辨率为0.63 mm(FWHM),y方向位置分辨率为0.62mm(FWHM),探测器各项性能指标均达到了预期目标。This paper introduces the detector of X-ray spot tracing based on the THGEM. It is used for X ray single photon measurement technology research and measurement with an effective area of 200 mm×200 mm. The circuit board has 128 array of high speed readout electronics based on ASIC and FPGA. And it is divided into two parts:the middle area of high sensitive and the peripheral area of low sensitive. The two parts share a set of readout electronics. The experiment tests the position and the fine structure of the beam line produced by X ray machine in National Institute of Metrology. The results of the experimental show that the detector realizes both the spot tracing and the fine structure of the spot. The position resolution is 0.63 mm in x direction and 0.62 mm in y direction in high sensitive of the detector, which achieve the desired goal of preliminary design. 相似文献
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In this paper, the performance of a type of domestic THGEM (THick Gaseous Electron Multiplier) working in Ar/CO2 mixtures is reported in detail. This kind of single THGEM can provide a gain range from 100 to 1000, which is very suitable for application in neutron detection. In order to study its basic characteristics as a reference for the development of a THGEM based neutron detector, the counting rate plateau, the energy resolution and the gain of the THGEM have been measured in different Ar/CO2 mixtures with a variety of electrical fields. For the Ar/CO2(90%/10%) gas mixture, a wide counting rate plateau is achieved from 720 V to 770 V, with a plateau slope of 2.4%/100 V, and an excellent energy resolution of about 22% is obtained at the 5.9 keV full energy peak of the 55Fe X-ray source. 相似文献
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矩形截面多孔介质腔体中对流分叉的有限差分研究 总被引:1,自引:0,他引:1
利用有限差分方法并基于分叉理论计算了矩形截面多孔介质腔体中浮力对流的分叉结构;绘制出几种典型情形的流线图和等温线图;讨论了对流模式的转换过程;对于几种较低的模式的转换,计算了临界瑞利数和临界宽高比。 相似文献
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建立了一种组装亚微米级聚苯乙烯微球的方法,称作蒸发自组装法.该方法是在一定温度下 ,聚苯乙烯微球随着分散介质的蒸发在悬浮液的气-液相界面处进行高效组装的过程.扫描电 子显微镜显示组装体为规则排列的密堆积面心立方结构.研究发现,气-液界面处生成的组装 体强烈地阻碍着分散介质的蒸发,单位时间内消耗的颗粒总数量随组装面积的增大而增加. 通过调整悬浮液的蒸发温度和组装面积,可以有效地控制悬浮液相浓度的变化,从而实现在 相浓度基本不变的情况下组装出高质量的聚苯乙烯胶粒晶体.
关键词:
蒸发自组装法
胶粒晶体
聚苯乙烯微球
三维有序大孔材料 相似文献
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