http://paper.ftliang.com/paper/index.php en-US http://paper.ftliang.com/paper/post/4/ Liang <admin@yourname.com> Mon, 07 Jun 2010 08:09:52 +0000 http://paper.ftliang.com/paper/post/4/
Abstract: On the SG-III prototype, the method of neutron time-of-flight has been used for the measurement of neutron energy spectrum. In the case of high-channel density, the leading edge timing discrimination is usually used, which inevitably results in the time walk effect of neutron time-of-flight that reduces the accuracy of the measurement. Besides, due to the very large dynamic range of ICF signal, nonlinear compression processing has been used for the input signal and nonlinear decompression processing should be used when processing the data in order to rebuild the waveform of the signal. In this paper, the two cases above will be fully analyzed, and then the solution of data correction and error analysis will bepresented according to the distinction of system.
Keywords: ICF, nTOF, neutron time-of-flight, time measurement, leading edge timing discrimination,
amplitude correction

摘要：神光 III 原型系统采用中子飞行时间法进行中子能谱测量。在高通道密度情况下，通常采取 前沿定时进行定时甄别，因此不可避免的会产生时间游动效应，影响对中子飞行时间的测量 精度；由于 ICF 信号的的动态范围非常大，因此对输入信号使用了非线性压缩技术，数据处 理时需要进行非线性解压，以便能对信号进行波形重建。本文针对这两部分内容进行分析， 根据系统特点给出数据修正方案与修正误差分析。
关键词：ICF，nTOF，中子飞行时间，时间测量，前沿定时，幅度修正
中图分类号：TL817+.8

2009第十四届全国计算机、网络在现代科学技术领域的应用学术会议


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Tags - ntof , 数据处理 , sg-iii ]]> http://paper.ftliang.com/paper/post/3/ Liang <admin@yourname.com> Mon, 07 Jun 2010 07:58:45 +0000 http://paper.ftliang.com/paper/post/3/
Abstract: Neutron dose rate meter is mainly used to measure and analyze neutron dose. The energy range of neutron radiation field is wide. Single moderator with single-counter mode is hard to get a good energy response, while multi-moderator with multi-counter mode has a poor usability. Neutron dose rate meter based on single moderator with multi-counter could balance the performance and usability, but there is no special equipment for it. In this paper, a well performance design for neutron dose-rate meter based on single moderator with multi-counter is presented. The design provides a high resolution of position information at a high counting rate. It provides significant support for theory verification, detector performance verification and product development.
Key words: single moderator with multi-counter, neutron dose rate, position-sensitive counter

摘要：中子剂量率仪主要用于中子剂量测量和分析。现场中子辐射场的能量范围较宽，单慢化体(单球)单计数器剂量率仪很难得到较好剂量能量响应，而能得到较好剂量能量响应的多慢化体(多球)多计数器剂量率仪易用性较差。单球多计数器模式的中子剂量率仪，能在一定程度上兼顾性能和易用性。国内虽有相关研究，却没有针对这种模式的专用仪表或设备，所以本文针对单球多计数器模式的中子剂量率仪方案，设计出一套完整的数据获取系统，针对实验测量可以给出较高精度的位置信息并支持较高的计数率，为实验原理验证、探测器性能验证和最终的产品开发提供重要的支持。
关键字：单球多计数器，中子剂量率仪，位置灵敏计数器
中图分类号：TL818+.1
Tags - daq , 中子 , neutron ]]> http://paper.ftliang.com/paper/post/2/ Liang <admin@yourname.com> Mon, 28 Dec 2009 10:32:15 +0000 http://paper.ftliang.com/paper/post/2/ Abstract
In this paper, a reconfigurable technique-based universal data acquisition systems(DAS) has been proposed for the similar characteristics of the existing DAS. Taking data acquisition in nuclear physics experiments as the design target, the analysis of signals and acquisition needs, the elaboration of resources and design requirements are implemented for the DAS in nuclear physics experiments. When the design has been accomplished, the full testing results show that all indicators reached the same levels of the existing systems. Then variety of DAQ functions such as the Digital Multi-Channel Analyzer and Digital Spectrometer have been performed only by the reconfiguration of FPGA logics for the DAS in target experiments. If the reconfigurable capability of the FPGA which has been mixed with the reorganization of hardware resources is used in the design, a more complex and powerful DAS could be preformed for the future. In this case, the hardware capabilities could be fully played, the development time could be reduced, and the cost could be minimized.
Key Words: DAS, DAQ, FPGA, reconfiguration

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Tags - das , daq , fpga , reconfiguration ]]> http://paper.ftliang.com/paper/post/1/ Liang <admin@yourname.com> Fri, 18 Dec 2009 10:24:39 +0000 http://paper.ftliang.com/paper/post/1/ 报告后，大家的第一感觉就是系统太庞大，有些臃肿，系统一次性开发所需工作量与精力相当惊人。 最终决定，第一版制作一个精简版本，保留必要功能，程控与跳线尽量精简。
第一版定位于实现功能，系统尽量简洁。

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Tags - daq , das , reconfigurable ]]> http://paper.ftliang.com/paper/post/0/ Liang <admin@yourname.com> Fri, 05 Jun 2009 06:22:05 +0000 http://paper.ftliang.com/paper/post/0/